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Cyclones - Science topic

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Hi there,
searching for the best postdocs or professors on climate change in Asia? Cherish your feedback.
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Scholars
Shifting Geographies of Expertise and Policymaking
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Weather forecast has utmost importance in Aviation, Ship routing, safety measures, planning and designing of structures, urban areas, offshore maintenance, natural resources, coastal areas, Agriculture, pollutants management and in many more weather applications in world wide.
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A seven-day forecast can accurately predict the weather about 80 percent of the time and a five-day forecast can accurately predict the weather approximately 90 percent of the time. However, a 10-day—or longer—forecast is only right about half the time.
But Extreme Weather Prediction models are yet to reach accuracy
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Hi everybody.
I'm working on Mediterranean Cyclogenesis using Melborn university Algorithm. Actually I got in trouble with tracking part. Is there somebody can help me in this regard?
Best Regards.
Maryam.
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I have two datasets. One with 9 past cyclones with their damage on the forest, wind speed, distance from the study site, recovery area. Another dataset with future sea-level rise (SLR) projections and potential loss area due to SLR.
  1. By using data from both disturbance events datasets (loss area, recovery area, wind speed, predicted loss area from SLR) can I create any kinds of disturbance risk/vulnerability/disturbance index/ hazard indicator map of the study area?
  2. What kinds of statistical analysis can I include in my study with these limited data sets which will help me to show some sort of relationship of "Loss Area" with other variables?
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I am sorting cyclones (35 years 1985-2019) that were intensified or dissipated rapidly.
While doing this I need a procedure to adopt for the classification of intensification or dissipation.
Would you kindly guide me in this regard, please
Bhutto
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Please kindly consult Ditchek et al.. (2017)
“The Relationship between Tropical Cyclones at Genesis and Their Maximum Attained Intensity”
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Hello
G'day
I am looking for a solution to perform the cross-track analysis of a tropical cyclone. This means plotting certain parameters across the track of cyclones. This is having x-axis with the time evolution of 5 days prior to the genesis of the cyclone and goes up to the 20th day since its generation and Y-axis shows the distance from the left-hand side (i.e. -300 km or -3 degrees) to the right-hand side (i.e. 300 km or 3 degrees) of the cyclone track.
I hope it is a very frequent analysis usually done in the cyclone study. Looking forward to your technical help in developing the code in NCL/Matlab/Python/Ferret.
Cheers, Saurabh
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Tropycal is a Python package intended to simplify the process of retrieving and analyzing tropical cyclone data, both for past storms and in real time, and is geared towards the research and operational meteorology sectors. So, I am not sure what you mean by "cross-track" analysis, and while I do not use Tropycal, I kind of get the feeling that it would provide you the tools you need to analyze TCs. Attached is a best tracks plot of TCs in the SW Pacific for the 2020-21 season; it is color coded by wind strength. I attach this as an example of what I think a "cross-track" analysis product is. A second plot shows TC frequencies during a time period - that could be another such product. Frankly, I really don't know what you want to do, but somehow I think that the Tropycal package can probably assist you. If I am wrong, then my apologies, but again, you asked a question and I merely provided you with a possible solution. Good luck in your work.
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Hello,
I have been carrying out an ANSYS Fluent CFD analysis of the system outlined in this paper:
Broadly speaking, my results are as expected for the setup and I'm very happy with them. However, I am missing one crucial aspect; the cyclone cooling effect shown in Fig. 6 is not observed in my results. I'm confused as to why this is the case. The air accelerates and swirls as expected. I have tried modelling the air using the Boussinesq approximation, as an ideal gas and as a real gas but the issue persists. Perhaps I'm not fully grasping the mechanism causing this cooling.
I'm not 100% sure the boundary conditions I set up are correct. Both the inlet and outlet are pressure boundaries with 0Pa gauge pressure. The inlet is at 300K and the backflow from the outlet is at 288K. I wasn't sure if I should set the gauge pressure for the outlet to a negative value to account for the change in pressure with altitude, or if the system deals with this. The solar flux is modelled by using the inbuilt solar loading and works as expected creating a temperature rise across the collector. Even velocities of the updraft are of the correct order according to quick calculations. I'm a bit lost as to where I have gone wrong, any help would be appreciated.
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After initializing your solution in Fluent need to go to file>data file quantities>select the variable you want it to appear in CFD-Post then press OK then write the case & data then run your case after that when you go to CFD-post you will find the the requested variable exist.
i hope this will help you Edward Jenks
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I am currently working on coastal water quality assessment. I need the impacts of SST on tropical cyclone formation and its related processes.
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Its very much related because cold water transfer to warm water area. As a result upwelling occours. Surface water very much related to upwelling.
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The question is about gaining more information and knowledge about cyclones which have shown increment in number in the recent years. Does we as a researcher can communicate some pre-measures to save damage to life and property.
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I would like to know the method of calculation. I mean which attribute(variable) needed from the data and how to calculate. I knew about the trends from the article linked below.
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Normally it is number of typhoons made landfall on a certain region or area of interest. Except this, the trends in Tropical Cyclones can also be checked in their intensity (i.e., if they have become more intense recently).
My following paper might be of your interest in this regard. We checked trends and regimes.
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1. Earlier the observations that there were increasing heavy rain in short time frame was observed for around 20 years in Ahmedabad / Gujarat.
2. Now the observations about the cyclones. The present 'Tauktae' 2021 has indicated that the cyclone strength has increased with time.
3. Extreme heat in summer was also observed, with slightly increasing the heat load and number of days the heat remains were also present.
Does all these observations indicate that, the extreme events are increasing with time (years).
I am not the climate specialist, but a researcher. The above observations indeed poses a question in mind, that the natural events of extreme symptoms are occuring now compared to 20 years back.
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Yes, a lot of works have already proved the scientific validity of the phenomenon of climate change which happens due to global warming induced by the increasing amounts of green house gases. All the weather extremes events you narrated plus the sea rise is a direct consequence of it. The the carbon dioxide level in the atmospheric air which was some where around 350 ppm during the pre industrialization era has increased to a level of 417 ppm today. This clearly proves the cause. Understandably and as predicted climate change impacts the life on earth, more so during the last two decades. Now the frequency and damage levels are increasing. No doubt the greatest issue to be addressed by man kind. Everyone knows but nothing tangible happens.
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The North eastern region of India (26.3 m ha geographical area) is having an unique geographical and environmental characteristics with very high annual rainfall, no or meagre rain during November to March, soil acidity, P fixation, soil, nutrient and biodiversity loss due to primitive farming practices like along the slope cultivation, shifting cultivation, lack of soil and water conservation measures and so on. The major challenge is sustaining food security and at the same time conserve natural resources. Drought, floods, hailstorms, cyclone, land slide, earthquake etc are major natural disasters in the region which farmers/people face every year. By 2050, about 30% deficiency in food grains is projected. Oilseed and pulses sector deficiency remain very high. Same is the situation in fish, milk, meat, eggs and so on. Only Horticulture sector is able to meet the requirement and provide a reasonable surplus, thus, there is opportunity for processing and value addition to enhance income and employment. Massive infrastructure and investment is needed for meeting seed and planting materials requirement for crop, animal and fishery sector. Mechanization is still one of the lowest in the region and restricted mostly to rice cultivation that too for field preparation, threshing etc. Light weight automated machines are required for field preparation, planting, intercultural operations and so on. There are large number of farm machines available in various parts of the country many of them may be suitable for the region, with only a little modification. Conservation agriculture is the real need of the region with principle not restricted only to three but beyond like agroforestry, integrated farming system, efficient water use, integrated nutrient management and so on. Rain water harvesting and its efficient utilization, acid soil amelioration, and sustaining soil fertility through integrated nutrient management holds key for achieving Sustainable Development Goal in the region. Addressing shifting cultivation through improved management approaches and farmers participation is also the focus at present. Trans boundary pests (insects and diseases)-their survey and surveillance and adequate management is the major thrust for protecting crop and animal. Addressing marketing and socio-economic issues are also important aspect of agricultural development of the region. Look forward suggestions for devising effective agricultural plan for sustainable hill agriculture. Collaboration and partnership in research is welcome to achieve the goal of self sufficiency and resilience in farming.
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The observation made are very pertinent in the background posted towards self reliant NEH region. The secondary agriculture activities on value addition are most needed. System intensification by use of conservation agriculture also needed specially for maize based system. The various studies on conservation agriculture showed good promise in the region and provided opportunity for second crop. The use of maize for silage baling could also help in enhancing livetstock productivity. The quality protein maize having high lysine and tryptophan showed a promise for food, feed and nutritional security for improved human health and pig and poultry productivity.
The sweet corn also showed good promise in Mizoram needs to be upscaled elsewhere. The babycorn and popcorn also needs to be explored for enhancing income and livelihood security.
The use of small-scale mechanization needs upscaling by using suitable machinery in the region for durdgery reduction and enhancing farm profitability.
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I Need remote sensing data for cyclone SIDR and AILA based on Coastal Area. I know Spot satellite all images are free before 5 years. So I need images from 2002 -2015.
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I came over it from the last Sentinel-2 Team Validation Meeting. You can also perform your own geometric processing to make the images superimposable with the service SWH-CARTO-2A: http://swh-2a-carto.fr/.
FYI I have not tried any of them, so please give us some feedback if it works.
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I have done flood mapping with Sentinel 1 data for 3 districts of India (West Bengal) i.e. North Pargana, South pargana and East Medinipur. North and South Pargana are showing increasing trend in the water inundation area after the cyclone. But East Medinipur is showing decreasing trend in the water inundation area which is quite unlikely, because after the cyclone the water inundation area should be increased. Now my question is that why is the decreasing trend shown in the East Medinipur district after the cyclone. Please help me to understand this.
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Prakash Biswakarma if possible you can communicate with Pro. Ashis kumar paul, Vidyasagar university. I think he will help you.
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Dear Friends, I have a data set of a cyclone impacted estuary. This dataset involve bunch of physical-chemical variables and copepod density data of multiple species. I have collected the data immediate after a cyclone so species no expanded from few to 16 in 7 days and I stopped the study. I had collected data from three sites.
I have tested site specific variations that is not significant for physical-chemical parameters and diversity indices. A reviewer recently wrote back to me " I am therefore, left wondering: why did you not consider multivariate analysis to assess the sequential change in copepod species/abunance dynamics following the impact of Cyclone...? An ordination protocol for example could show how either sites or sampling periods".
Doing multivariate is not a problem for me but I refrained from it seeing the community is unstable therefore CCA type analysis may over look many details of changes. I instead have done univariate following GLMS. What is your theoretical or philosophical opinion on this issue.
Thanks
Dr. Sourav Paul
University of Calcutta
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Multivariate analysis will give you a more conceptual perspective on which variables are driving the Copepods' community, therefore you can run a Spearman correlation ranking using PRIMER based on p-values to opt for combination of variables that have significant impact in the Copepods' biomass. Or else do an Ecosim with Ecopath model. I hope I make sense.
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At present all the world is experiencing weather extremes due to the impact of the climate change. Who is responsible for those consequences of extreme weather in all over the world? finally who is ready to face all these effects by Govt./People? Why all the Govts are not focusing on immediate controlling strategies? Not identifying causative factors in the world? How long will take time to clear our world environment? Why all the Govts not strictly controlling in the ground level before effluents entering into the environment? Why effluents are not treating/estimating properly? How it becomes more dangerous to human life and environment in all over the world?
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Climate change is everyone's responsibility. Everyone at their own level must do what is necessary. International institutions, governments, civil societies, associations, peoples, ... etc. must unite and fight against climate change. The earth is threatened, and the human being is in danger of disappearing? All together to fight against climate change, whatever the country, religion, ... and differences ... The land belongs to us… but we also belong to it! Professor Emeritus Ahmed KETTAB
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Just see the VDO clip- Super cyclone broke all regulations of CORONA isolation
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The Indian city of Calcutta was devastated by a powerful cyclone that killed at least 84 people in India and Bangladesh. On Wednesday, cyclone Amfan hit coastal areas of India with ferocious wind and rain. The cyclone gradually weakens, moving North towards the state of Bhutan. Thousands of trees were uprooted, power lines were destroyed, and homes were completely destroyed. Most of Calcutta's roads are flooded, and 14 million people remain without electricity. Amfan is the first super cyclone to form in the Bay of Bengal since 1999. Restrictions imposed in the country due to the coronavirus pandemic hinder emergency response and assistance. Covid-19 and social distancing measures have made mass evacuations difficult, as temporary shelters cannot be used at full capacity. It is reported that at least 72 people were killed in India, and 12 people in Bangladesh. The chief Minister of West Bengal, mamata Banerjee, said that the destruction that the super cyclone brought to Calcutta, the state capital, was "a bigger disaster than Covid-19". Officials in Bangladesh fear that amfan will become The deadliest cyclone since cyclone Sidr, which killed about 3,500 people in 2007. As you know, most of them died as a result of the high tide of sea water. The weather Department of India predicts storm surges of water 3-5 meters high. The overall level of destruction in Bangladesh has yet to be assessed, but it is clear that the areas that were in the path of the Hurricane suffered the most. In the city of Khulna, North of Sundarbans, at least 83,000 homes were destroyed or damaged, the Dhaka Tribune reported.in the Bay of Bengal since 1999. Restrictions imposed in the country due to the coronavirus pandemic hinder emergency response and assistance. Covid-19 and social distancing measures have made mass evacuations difficult, as temporary shelters cannot be used at full capacity. It is reported that at least 72 people were killed in India, and 12 people in Bangladesh. The chief Minister of West Bengal, mamata Banerjee, said that the destruction that the super cyclone brought to Calcutta, the state capital, was "a bigger disaster than Covid-19". Officials in Bangladesh fear that amfan will become The deadliest cyclone since cyclone Sidr, which killed about 3,500 people in 2007. As you know, most of them died as a result of the high tide of sea water. The weather Department of India predicts storm surges of water 3-5 meters high. The overall level of destruction in Bangladesh has yet to be assessed, but it is clear that the areas that were in the path of the Hurricane suffered the most. In the city of Khulna, North of Sundarbans, at least 83,000 homes were destroyed or damaged, the Dhaka Tribune reported.
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I am working on a project to send data to a database using FPGA over Ethernet connection. I believe the FPGA needs to communicate with SQL Server in order to transfer the data to a database. I am very new this and unfamiliar to the protocol. Any advise would be much appreciated.
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Hi Peter and Aurelio,
Thank you for the suggestions.
I have successfully ran a web server demo using NIOS II. I will look into Linux kernel to communicate with an SQL database.
Regards,
Syasya
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I performed experiment using wrf for a particular cyclone. I noted its position (latitude & longitude) for every 6hr using the central pressure. I have the observed tack data, both in excel.
I used Pythagoras formula to calculate the displacement but in degree and not in km.
Any kind of help is appreciated!
Thank you!
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If one is interested in distance on a sphere, as Dean points out above, the great circle distance is the thing to use. The best source i know of, in this regard, is "Smart's spherical astronomy" which also deals with the complexity of dealing with the terrestrial atmosphere, that contributes to such things as the Sun's apparent oblateness, and "differential refraction", etc.
It really is the peak of analytic methods for these kinds of effects.
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Developing states as well as developed states facing a problem of environmental hazards like floods, cyclones, tsunami etc due to the global environmental changes. Mostly affected are the under-developed states due to lack of resources. South Asian states especially Pakistan, India, Bangladesh, Maldives, Bhutan, etc. are facing serious problems of floods. I am seeking literature regarding flood hazards in Pakistan, India, and Bangladesh.
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Check C. Emdad Haque and M. Q. Zaman for case studies in Bangladesh. Brammer on floods in Bangladesh.
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emergency help
i want to meshing cyclone without icem . i am a beginner. i want to meshing by ansys meshing but i dont know which one method is right and which mesh part of cyclone should be small (sizing)
thanks for helping and full guide for this project
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Check the ansys tutorial for the cyclone meshing.
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Why did Tamil Nadu (only 50 cyclones) experience the least number of CYCLONE LANDFALLs along the East Coast of Peninsular India in comparison with that of West Bengal (70 cyclones), Andhra Pradesh (80 cyclones) and Odisha (100 cyclones) - in the last 1000 years?
Off the 300 cyclones over a period of 1000 years between 1900 and 2000, only one third were really severe, while the rest (nearly 200 cyclones) got weakened before striking the east coast.
Why is it so?
The same thing is happening now - that is - Cyclone Gaja - is getting weakened - before striking the east coast on 15th Nov (Wind speed not even 100 km/hour - somewhere between 60 and 80 km/hour).
What is the physics behind such weakening of the (cyclone) system?
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It's very important
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We generally heard from learners / Teachers / Researchers that to predict Climatic Change or Oceanological/ Meteorological dynamics and their corresponding paths we need to solve a series of Nonlinear partial differential equations. My question is Who has set this partial differential equations? How these equations are formed ? What are the initial and Boundary conditions ? Is it possible to determine the actual initial and boundary conditions of the Physical problem?
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Thank you Prof. Pudykiewicz and Prof. Mestas-Nunez for sharing your knowledge. I think more research, more discussion and time ( knowledge generation from time series analysis) will tell the actual answer. Thanks.
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What are the differences among the hurricanes, typhoons and cyclones?
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Hurricanes and typhoons are the same weather phenomenon: tropical cyclones. ... The same type of disturbance in the Northwest Pacific is called a typhoon. Meanwhile, in the South Pacific and Indian Ocean, the generic term tropical cyclone is used, regardless of the strength of the wind associated with the weather system
@Eman Ali Al- Khafaji,
Regarding your respone above, you forgot to include the relevant reference source (https://oceanservice.noaa.gov/facts/cyclone.html).
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I am studying different variables associated with the cyclone and its variability in north Indian ocean,
any help would be appreciated.. Thank you
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Okay..I will try it for all levels then, thank you so much, It was very helpful
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hello
i am working on a Tropical cyclone intensification in Bay of Bengal
can anybody help me to plot a cyclone tracks using ferret
thank u
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Assuming your would like to identify the center of the tropical cyclone by its low pressure and assuming that you have a series of pressure organized as a netcdf-file, for instance, with three axis:
  1. x-direction (eg. longitude)
  2. y-direction (eg. latitude)
  3. time
So the first step could be to compute the temporal minimum pressure field
let press2Dmin = pressure[l=@min] ! minimum in time
Now lets compute for each time step the pressure difference to the 2dim minimal pressure field
let pressDiff = pressure - press2Dmin
You shall find the center of the tropical cyclone at the locations where the difference is zero
let pressLoc = pressDiff[l=@loc:0] ! Find in time/ L-index
I hope that it helps to answer your question.
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I am working on incinerator and need to design good mechanical dust collector. But confused about how to find dimensions and design it.
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Hello Sneh. A cyclone needs about 20m/s gas velocity at the entrance. You probably know the flow rate, so it is easy to design the entrance. Other dimensions like cyclone diameter are easy to find because there are fixed relations between dimension. For example the width of the entrance corresponds tipically to 20 - 25% of diameter.
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A severe cyclone has recently struck the east coast of India. What is it that make cyclones a frequent phenomena of the Bay of Bengal and at same time quite rare at Arabian sea?
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General necessary condition for having a cyclone is surface water vapor evaporation that mostly depends on SST (Sea Surface Temperature) to produce saturated bulk of humidity for moist-convection, the other alternative is having a low-centered pressure as a disturbance to have a convergent zone and then moist-convection and low level high-vorticity. These conditions between those two regions are not the same. Furthermore, there are some studies represent the effects of pre-monsoon and post-monsoon activities upon BOB's cyclone production.
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Though May, October, and November displayed the highest cyclones activity in the Bay of Bengal, these months did not contributed locally to a significant amount of the total rainfall. Is my contribution analysis correct?
TCs_monthly_contribution = ( Ki / Li ) *100
Here, i = 1..12
Ki = TCs average rainfall, Li = total non-TCs rainfall
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It seems that you oversimplified the methodology of study and your way of reasoning needs to be modified. Below is a list of some suggestions (it's not all) that might be useful. By considering them, you can choose a statistical or dynamical method to study the topic:
1) A few phenomena and variables are able to affect rainfall in the Bay of Bengal. So logically if you are willing to study just the effect of cyclones activity, then you should be sure that at that time and space the other players have the same behavior. Because you can compare just comparable.
2) Some major players are: SST (Sea Surface Temperature) [There is a positive gradient of temperature toward equator], SSP (Sea Surface Pressure), APSL (Atmosphere Pressure at Sea Level), Wind speed, and atmosphere temperature.
3) Some major currents that affect precipitation at Bay of Bengal are: inter-seasonal Madden Julian Oscillation (MJO), Rossby Waves, Kelvin Waves, etc. So comparable day should have almost similar pattern preferably.
4) Cyclonic activity have a daily or weekly frequency, so finding appropriate frequency is a key point.
5) Based on your desired method, you and your supervisor can design your research plan.
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I am working on simulating tropical cyclones in the Indian Ocean by weather research and forecasting model (WRF). Firstly, I tried to study the impact of different microphysics schemes on the forecasting tropical cyclones. The cyclone track was far from the best-observed track as shown in the attached figure. Then, I did WRFDA (3DVAR) simulation for the same case to improve the result. WRFDA model estimated the cyclone track but didn't estimate the minimum sea level pressure as shown in the attached Figure. I think that the problem is in estimating the PSFC. Thus, I would like to ask if anyone has recommendations to improve the results.
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Time variation of MSLP is not the best diagnostic for midlatitude cyclones. I propose look at intensity of the vortex during nonlinear evolution for example its vorticity, potential vorticity, mean azimuthal velocity with respect to the core, and pressure contours around the core accompanied by water vapour tracer field. By these diagnostics the evaluation of nonlinear evolution is much easier.
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Can Al2O4. Al2O3. AL O (OH) and AL (OH)3 be extracted from a powder containing Nepheline. Can this be done without chemicals? Could it be done by cyclone, sieving or heat treatment. I have large amounts so the process must be scalable.
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Thank you. I will have to look at extracting to get a Al that can be used to make aluminium without chemicals. Thank you again.
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I am working on modelling the tropical cyclones in the Arabian Sea. My model has three domains with different horizontal resolution (30 km. 10 km, and 3.33 km). I aim to estimate the cyclone track and intensity from the second domain and the precipitation from the third domain. I did several experiments by selecting the physics of WRF model based on well tried schemes. I did four experiments with fixing the physics scheme and changing only the micro physics in order to get its impact on the cyclone track and intensity.
I used Rapid Radiative Transfer Model (RRTM) for long wave radiation, Dudhia Scheme for short wave radiation, Noah Land Surface Model Scheme for Land surface, Yonsei University scheme for Surface and boundary layers, and Kain Fritsch Scheme for Cumulus Parameterization. In addition,for the sensitivity analysis of the micro-physics scheme impact on the model, I used Single moment 3- class WSM3 scheme, WSM 6 graupel scheme and Kessler Scheme while fixing the other schemes. However, my model result is not reliable in all this experiments.
I would like to ask if someone have a recommendation to improve my result as most of the previous study could got the cyclone track close to the observed track by using the same physics scheme .
I hereby attach the simulated cyclone track and minimum sea level pressure (MSLP )with the best observed track and the observed MSLP. In addition to the namelist.input for your review.
Thanks in Advance.
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In my previous study below, I used WSM6 for MPS, KF for CP, YSU for PBL, and RRTM for radiation. But it could be different in different cases.
During the mean time you plan a sensitivity test with microphysics, you may also want to think about WRF's tropical storm bogussing (serch "bogus" at http://www2.mmm.ucar.edu/wrf/users/docs/user_guide_V3/users_guide_chap5.htm#_Description_of_Namelist) to improve the initial field, which may or may not make the model less sensitive to MPS selection.
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I am studying the impact of micro-physics parameterization scheme on tropical cyclone track and intensity. I would like to ask if there is a way to estimate the cyclone track by GIS/QGIS.
I would like to know, if you have any other suggestion.
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Tropical cyclone track could be traced by locations of lowerest sea level pressure data. Here is an example: http://www.meteothink.org/examples/meteoinfolab/trajectory/typhoon_path_trace.html
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Normally producer gas is cooled to normal temp and fed to engine fully replacing diesel as fuel. It is done after cleaning and washing then removal of water. As gas is produced at 677 degree celcius, after cleaning through cyclone and ceramic filters it particulate loading is 1.0 mg/Nm3. My gas is available at 600 degrees. Can i directly feed it to utilise its sensible heat and avoid derating of diesel engine ??.
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thanks a lot. I was wasting my efforts on ANSYS to create my own 3D CAD model. GT suite is more suitable software for this. There are so many research papers for Higher CR on gaseous fuels here. I requested them. Once i recieved them my half problem will solve itself. i still beleive that i can work around 20-25 CR thus acheiving higher efficiency in SI engines and there will be no derating of diesel engine at all.
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Dear all,
Is there anyone who experienced problem in merging global and local bathymetry dataset?
When extracted depth of GEBCO or ETOPO dataset reach to measured depth, I meet a difference of 2000 m in deep water and at least 100 m in shallow waters. Such differences make surge model results wrong.
How should I face with this issue?
(Measured depth are available in a distance of 10 km from shoreline. For the rest parts, global dataset is utilized. Moreover, the area cannot be considered smaller, since it should cover the cyclone track).
Thanks in advance for your help,
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You will issues at the boundary and their you could apply smoothing technique through GIS tool. It would be difficult in correct in one go, but it would take some time and Experts help.
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Indicators of measuring effectiveness of warning system.
Medias of disseminating early warning messages.
Reasons for not responding evacuation order.
Local cooperation and coordination among public agencies, NGOs, volunteers, Fire service, Law enforcing agencies etc. during cyclone.
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Common vortex identification criteria like lambda -2 and Q-criteria identify vortex by considering a vortex core as a region of local pressure minima. I understand that the reason a vortex core is considered to be a region of local pressure minima is because the pressure gradient is able to provide the required centripetal force for the fluid to rotate. Is it necessary that vortex core have a local pressure minima? If yes, are anticyclones not vortices even though they have a rotating mass of air?
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I think that Sec.2.1 in this paper can answer your question
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How about the structure of inflow layer in the outer circulation of tropical cyclones?
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It is not easy to clearly identify PBL height in the tropical cyclone(TC) partly due to its interaction with the underling warm sea surface during the TC's life time. Observation and modeling data show that tangential winds have their maximum near 850 hPa level and radial winds change their direction near 850 hPa. The radial winds blowing into the TC's center is strong near 950 hPa. On average and roughly speaking, we can say that the top of inflow layer equals the PBL height.
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Degritter- Is it grit washing? or removal of grit?
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De-gritter is grit removal tank. Early design for grit removal was square constant level short detention time tank. The corner zones are sloped into central circular grit collection zone. These basins are designed in accordance with ASCE 1992 to maintain detention time of 1 minute or less at the design flow rate.
A cyclone De-gritter is also used to remove the grit from the sludge . Grit chamber may not be installed and grit is accumulated with the sludge removed in primary clarifier. Cyclone De-gritter uses centrifugal force to separate the heavier particles from the lighter particles.
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I have calculated potential intensity for a cyclone using Tang and Emanuel (2012) relation.but at the beginning of TC lifetime U_PI^2 is negative due to larger value of s_b (boundary layer entropy) comparing with s_*_SST(saturated value of entropy at SST). I used averaged values over 4*4 degree domain centered by TC eye at each time step. I used also reanalysis data.
I do appreciate if some one help me
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I am trying to mesh a cyclon for mine process, it has some parts that I cant make a conformal meshing, mesh is no continuos and there is no compatibility on nodes.
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The Pakistan-Arabia Dust Cloud seems to be more powerful than a Category-5 cyclone like GONU, that you can see at http://www.ecoseeds.com/GONU.html, http://www.ecoseeds.com/newGONU.html and http://www.ecoseeds.com/GONU3.html.  Anyone else looking at these interactions?
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We already analyzed both dust more in
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Peril such as earthquake, flood,cyclone damage structures differently. If one computes hazard risk score (on a scale of 1-10) for each of them on a grid of say 0.25 km X 0.25 km. How to combine these scores and compares hazard risk of different geolocation quantitatively/ qualitatively ?
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What are some current research paper on storm surge modeling?
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ADCIRC is a surge model using finite element method. 
SLOSH model used by NHC/NOAA
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I have a set of data with wind speed (knots) for a particular tropical cyclone. How can I calculate Pressure Drop from these datas?
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Kindly see the following link,
regards,
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I am working with industrial cyclones, I want to know how the pressure and the air velocity affect the temperature of the air inside the vortex.
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For gases flows you may use ideal gas relation PV=mRT. You may convert this to your desirable parameters. In high speed flows, you may study gas dynamics. 
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Cyclone, lowest atmospheric pressure recorded so far. 
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Dear colleagues! 
I think that the cyclones often generate a storms in the Black Sea/
Main direction of waves and storms is from the West to East
Cyclonic circulation/
In your results "Mean wave energy Flux 1979-2009"  direction of energy flux is from east to west. May be It is error?
In attach typical storm and vectors os waves.
This is annual wind field for 1996 and it seems good (Van Vledder, G.Ph., and Adem Akpinar, 2015). But it is no correlation with mean wave energy direction (in attach).
May be anybody have pictures for mean wind field 1979-2010 ?
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Wind speed in a cyclone...
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Sir, It is 408 km/h in cyclone Olivia
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Status of GEO ring. 2008: only 32% of GEO objects are controlled satellites. 2013: 21% fully controlled, 9% only East West maneuvers. Anyone has updated info?
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Thank you both!!
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My research is in the field of failure mechanisms of metal components in cyclonic wind events.  I am seeking to establish the effect of resonance of steel strucures induced by wind to estimate survivability of a structure.
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I am new to NCL scripts. I have build the scripts for the analysis of surface pressure, Winds, Sea Pressure Contour and I am getting this annoying Warning.
"warning:tmXBBorderOn is not a valid resource in plt_Surface24_1_map at this time"
Also I am also not getting the lat long information although I have used the resource for the projection.
I am analyzing the output for 48hr forecasted cyclone Vardha output at 12km Resolution.
Please help me !
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It looks like you have installed NCL from a default Debian-based repository which is actually outdated and causes a lot of troublues due to incorporating a bit different scheme of NCL's directories and not setting environmental variables to your shell.
I would strongly recommend to uninstall the current version of NCL and follow these documentation to install NCL from binaries: https://www.ncl.ucar.edu/Download/linux.shtml . Actually, it is the only way to install NCL properly on Ubunt/Mint/etc. machines.
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Dear all,
I'd like to know how are defined on a surface map the position of fronts (cold and warm) that we find on meteorological surface pressure maps (see link). I want to plot those fronts at a specific time during a cyclone (low pressure), see the attached pdf file upper panel.
Is there a specific criterion to define those front positions?
I'm using ECMWF ERA-20C reanalysis data so I have access to many parameters. I've tried dew point temperature gradient (norm) to find the brutal change in temperature and moisture associated with warm front without great success. Maybe a specific isoline of dew point temperature? I'm using 1 degree gridded data, maybe my resolution is too coarse?
Thanks in advance,
Nicolas
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Dear Nicolas,
The position of atmospheric fronts on weather maps are determined with more surface meteorological parameters, such as: forms of sea level pressure, the tendency of pressure, temperature, types of clouds, precipitation, wind and humidity; and with more upper parameters, such as: pressure, temperature, wind and humidity. Also, these parameters are different for cold, warm and occluded fronts. In addition, the position of the front is determined the orographic obstacles. Products numerical weather prediction not contain explicitly positions of atmospheric fronts. On these products positions of fronts are drawn later with the help of the general criteria of recognizing fronts. This is usually done by specialists, synoptic meteorologist. He draws the position of the front with the help of synoptic experience. Thus, the position of atmospheric fronts is not completely objective atmospheric parameter. Determination of the position of the front is partly based on subjective experience synoptic meteorologist. The criteria for the position of fronts are best learned in the courses offered " Weather Analysis", and / or "Synoptic Meteorology", and then in practice. Also, the criteria for determining the front can be found in books of similar titles (e.g. Djuric, D., 1994: Weather Analysis. Prentice-Hall, New Jersey, p. 304.)
Best,
M.B.Gavrilov
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In an industrial fluidized bed reactor, there are usually few differential pressure transducors installed to indicate particle concentrentations of dense bed or freeboard. Could you suggest me a better method to locate the dense bed surface? Accuate determination of the bed surface loaction is critical in design cyclones or diagnosing particle loss problems.
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Thanks a lot for your answer, John. I understand the method you provided, which is also the traditional method used in industrial fluidized bed. A simple assumption of this method is the dense bed have a constant density throughout its height. However, I have measured the density profile of a fluidized bed throughout its height by multiple pressure taps. I found the density usually decreases with increasing height especially in high-velocity turbulent flow regimes. In an industrial fluidized bed design, how to properly locate the three taps (more commonly adopted as I observe) will influence the accuracy of the determined bed surface level. I think your suggestion to measure the bed density in the middle of the bed may be a good advice. Your suggestion to dampen or average the pressure signals is also good to encourage application in industrial DCS systems. Anyway, thank you very much, John.    Yongmin
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In class, we learned that El Niño is a phenomenon that happens periodically around every 3 to 6 years. However, it was discussed that La Niña, on the hand, does not follow an El Niño every time. Is there a particular condition for a La Niña to trigger? Can it occur without an El Niño event? 
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Maybe our thinking is flawed - we seem to expekt ENSO must be an oscillation. In fast we even call it one. What if both phases are just different responces to a somewhat random forcing? 
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I want to assess the inundation situation after cyclone ROANU and also want to compare it with the condition before ROANU. If I want to see the amount of water body after ROANU, how should I have to process SAR image?
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you should read the scholar's answer carefully. Mr. Arun have uploaded his published article while answering your previous question.  he worked on Sentinel-1 dataset for Chennai flood. in this article, it is clearly mentioned, how the sentinel-1 images of pre and post event were used to assess the inundation. read that article once and you will get the idea how to use the SAR image. please refer the article.
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Hello All,
Im trying to simulate a cyclone with a a sieve screen. I have my 3d model but I can't put the sieve in my model but its too complex. Hence, I want to know how to model it in fluent assuming it as a thin cylinder. 
Regards
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Hello Mr. Alkhayyat
You could use the following link.
Good luck.
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It is said to be a successor of TRMM. I want to know about certain advantages and uncertainties of using GPM datasets for tracking monsoons and Cyclones.
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Dear Arun,
Global Precipitation Measurement or GPM is a program of several space agencies led by the US space agency NASA whose objective is to make periodic measurements of precipitation close to the level of the entire planet. This program is a continuation of the mission Tropical Rainfall Measuring Mission with broader objectives. Several satellites must collect data whose consistency will be ensured by the GPM Core Observatory satellite developed by NASA with an important participation of the Japanese space agency JAXA. The data collected by the GPM satellite fleet should improve the daily weather forecasts, better prevention of natural disasters related to flooding or droughts, and for the long term, help improve modeling of change climate. GPM Core Observatory is a satellite of 3.2 tonnes which carries two instruments developed especially: a dual frequency radar and a radiometer.
GPM extends the scope of observations in low-intensity rainfall (up to 0.5 mm per hour) and the snow, which predominate at mid and high latitudes. This capability required the premise developing appropriate instruments.
The Global Precipitation Measurement program aims to measure precipitation globally and is implementing several satellites. It is based on the implementation of a central satellite (GPM Core Observatory) carrying a radiometer and radar to measure rainfall from space and serve as a reference to unify the measurements made by the other spacecraft attached in the program.
With my best regards
Prof. Bachir ACHOUR
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How can I get the details about the maximum wind speed radius (R Max) for storm surge modelling. I have download the cyclone tracks and I have generate the cyclone wind generation to storm surge model for that I need the R.max value inputs for Young and Sobey model.
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You can also consult the famous Holland (1980)'s paper: MWR 108(8) 1212-1218 which can give you good indication for wind profiles in hurricanes. Such profiles are largely used in the literature.
Best
G.C.
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 I have learned the algorithms, but not good at programming. I am looking for the cyclone identification and tracing method. Is there anyone could share the code or executive files with me?  Thank you very much.
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What type of tracking you gonna to do? You wanna use pressure/vorticity fields or satellite data?
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more vulnerability of Gujarat to cyclones in western part of India
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Dear Sureshkumar Nekkala you mean tropical cyclones?
If so, the Arabian Sea is one of the centers of origin of tropical cyclones.
Did you mean specifically abnormal amount this year?
Specifically, specify question please.
Regards Vadym.
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The Safir-Simpson hurricane scale is a classification method to identify the intensity of a tropical cyclone by civil engineer Herbert Saffir and meteorologist Bob (Robert) Simpson, but this method proved to be useless due to its failures to identify the two thirds of the top 156 deadliest hurricanes from 1851 to 1996. I found the overgeneralization problem caused this.
I developed a new classification method to deal with this problem, but many reviewers and editors told me that even though what you said is correct, we still insist on using SSHS, and your paper can't be published at least in the journals of USA due to common people accepting SSHS. I really don't know why this thing could happen in scientific world, any people know the true reason?
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one year ago , I found it , and downlaod from the official weasite. But I don't know why they disaperar recently, if you want , I would forward the data which I download one year ago.
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I'm doing a research on cyclone prediction using wind data and TRMM precipitation data.
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Dear Sajith Galgamuwa
I think it depends on your case study area. You know cyclone  covers a large area. so I think you need 0.5*0.5 products of TRMM, but as I told it's necessary depend on case study's area.
After that you can use, these links:
Best wishes
Nasrin
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Such as the wind speed,precipitation,temperature,air pressure,and relative humidity.
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In Mexico you would have to log into the National Meteorological Service web page and choose de automatic weather station option. Most of this stations measure every 10 min and report measurements either every hour or every 3 hours. You would have de choice of data for last 24 h @ 10 min, or last 7 days @ 60 min or last 90 days @ 24 h.
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I need to draw the contour of wind speed for cyclones
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in terms of visualization theory, you could color-code your altitudinal ranges, or simplify the maps by dividing each representation by altitude or altitudinal ranges.  You should not represent the various wind vectors or isovents/isovels, at various altitudes on the same map.  It will not be clear to the viewer (percipient) if you combine ALL vectors/contours on the same map, WITH the alititudal ranges as well.  Either define each range or grouping by color, or separate them on different maps (diptychs, triptychs, etc).  Good luck, TRP
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I'm using CORDEX south asia wind data for simulation of waves in Indian ocean region. So I would like to know whether cyclone and sea breeze is being considered in this?
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Thank you
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So far, I was thinking that in the northern hemisphere the cyclonic rotation is in anti clockwise direction. So, with the same direction its movement also be there. (e.g., most of the Bay of Bengal (east coast) cyclones like.. Neelam, Thane, Nisha)... But in the Arabian sea it is moving towards North east direction (e.g., cyclone Nilofar) ..
Is it because of background wind or any other factors are there for determining the cyclonic movement?
I  am willing to know which factor is determining the cyclone movement... 
anyone can help me?........
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Actually tropical cyclone movements depends on several factors. Here is one link i am adding for further reference. hope it will help you
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See above
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Satellite and aerial images do provide time sheets of the delta evolution. Post cyclone surveys are also recommended - see for example the below you can download from research gate:
Fritz, H.M., Blount, C.D., Thwin, S., Thu, M.K., Chan, N. (2009). Cyclone Nargis storm surge in Myanmar, Nature Geoscience 2(7):448-449, doi:10.1038/ngeo558.
Fritz, H.M. (2009). After the storm, Nature Geoscience 2(7):528-528, doi:10.1038/ngeo568.
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In a fluidised bed gasification, cyclone removes the fly ash/particles leaving with the syngas, What is the best mechanism of ash removal from the bed side in the temperature range of 800-1000 degrees for small scale capacity FBG?
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Considering small scale application an entrainment of small or light ash particles seems the easiest way. Then gas should be cooled down to condensate volatilized impurities at the surface of ash fines (quite typical behaviour of nucleation). Cyclone can be used in next step. However in case of large content of tar and volatilities it can be plugged quite easily. In such a case impurities (particles/droplets) can be removed during gas flow through the water spray and particle-drop or drop-drop collisions. Produced slurry can be separated by filtration. Water can be separated from liquid volatilities then returned to the system and then lquid volatilities and solid/tar particles can be burned.
Such solution seems reasonable in relatively small scale plant. In bigger ones electrostatic precipitators are more profitable.
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The country would not survive if there is natural disasters like tsunami, cyclone, flood and drought. So what measures or immediate action so be taken to protect lives?
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I think for some natural hazards, the forecasting is the best way enables us to take the most important measurements.
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Here we are talking about a community that is perennially exposed to cyclones.
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I would suggest to have a look on approaches that are applying Bayesian Networks for risk assessment as, e.g. presented at the conferences of the Australasian Bayesian Network Modelling Society (ABNMS) (http://abnms.org/conferences/abnms2013/program.php). An interesting recent related book that I can also suggest is: N. Fenton and M. Neil, Risk Assessment and Decision Analysis with Bayesian Networks, CRC Press, 2012. (http://www.bayesianrisk.com/)
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I want to see whether there were any typical impact of low pressure systems occurring in The Bay of Bengal to atmospheric pollutants at Bhubaneswar, Odisha, India. Please suggest how can I derive the past low pressure system images at various dates (During November 2010 to February 2012). Which satellite images can be used and where from can they be downloaded?
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You can get this from various publications of IMD.
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Where RH is the relative humidity between 500-700 mb. Humidity is zero if RH<40 and one if RH>70.
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I believe the factor 30 is simply a scaling parameter so that M=1 when RH=70%.
See the original work at: