Naresh Kumar

Himachal Pradesh University | HPU · Department of Commerce

To investigate the mechanisms responsible for severe convection linked with a variety of mesoscale, synoptic systems over the Indian region, a preliminary analysis is conducted. Using IMD RSRW/Reanalysis (ERA5)/Lightning (TRMM LIS) products both local‐scale thermodynamics and large‐scale background conditions responsible for the major lightning hot...

March and April 2022 months were peculiar with respect to the high temperatures breaking long-period records for India. This study attempts to explain the different causative meteorological factors that led to unprecedented hot weather during the March and April months of 2022. It is interestingly seen in the analysis that the high surface temperat...

The present study aims to investigate the impact of corporate governance practices on economic and market value addition of top twenty listed companies in India, 10 each from public sector and private sector for a period of ten years from 2011-12 to 2020-21. The objectives of the study are to investigate the impact of corporate governance practices...

The present research work aims to examine the corporate governance practices and their impact on financial performance of top 20 listed companies in India, 10 each from public sector and private sector for a period of 10 years from 2011-12 to 2020-21. The objectives of the study are to examine the corporate governance practices of public sector and...

There have been major advances in the last few decades in our understanding of heavy rainfall during monsoon season due to substantial progress in both observation and numerical modelling of monsoon. All these resulted in more accurate forecast of heavy rainfall in short to medium range, (upto five days) with 40% improvement in accuracy of heavy ra...

There have been major advances in the last few decades in our understanding of heavy rainfall during monsoon season due to substantial progress in both observation and numerical modelling of monsoon. All these resulted in more accurate forecast of heavy rainfall in short to medium range, (upto five days) with 40% improvement in accuracy of heavy ra...

India experiences several types of natural disasters including cyclones, floods, droughts, earthquakes, landslides, heat waves, cold waves, thunder squalls, and tornadoes. Most of these natural disasters (about 80%) are hydro-meteorological in nature. The risk management of these natural disasters includes several steps based on their severity and...

Heat waves are often termed as the silent killer and have become even more important as recent studies suggest that the heat wave have become second most devastating extreme weather events in terms of human deaths and losses. It is also been largely realised by scientific community that it is not just the high temperatures which are responsible for...

Heatwaves are a major cause of environmental and health hazards. In a global warming scenario, the effect of heat stress associated with the increased frequency of heatwaves makes a large number of people vulnerable over the Indian subcontinent. For the development of a proper heatwave action plan in this region, heatwaves are required to be monito...

An exceptional heavy rain/snow event caused flooding and Avalanches over southeast Iran, Afghanistan, Pakistan, and Indian Himalayas from 11 th January to 13 th January 2020. As a result, there was a huge loss in lives and property. In Pakistan only, there were around 100 human deaths and more than 200 houses damaged. This unusual event was due to...

Study of rainfall trend is of great importance in India where food security and economy primarily dependent on rainfall. Present work is carried out to perform the detailed analysis of temporal variability in North East India rainfall. Temporal variation in monthly, seasonal and annual rainfall over northeast India (NEI) is studied using monthly da...

This chapter discusses the observed features of southwest monsoon 2019 depicting various synoptic situations during the advance, mature and withdrawal phases and the salient features of the synoptic scale systems.

A Brief Report on unprecedented weather including Fog, Cold wave & Cold Day during December, 2019 over northern parts of India: The plains of north India and adjoining Central India experienced unusual Cold Day Conditions during second half of December, 2019 following an active Western Disturbance (WD), which affected the above region during 11th-1...

The major objective of any national weather forecasting services is to provide weather forecast and warnings and other meteorological related information to the public and government for the safety of life and property and economic activities. The heavy rainfall causes huge loss to the public in form of flood and landslide in varying severity mainl...

In the recent past, there were extensive floods in the Western Himalayan region (WHR) due to continuous long spells of heavy rainfall for 3–4 days that caused a huge loss in life and property over the region. WHR is a data sparse region, with limited meteorological stations having a continuous long spell of daily precipitation data. In the present...

While destruction associated with floods during the monsoon season and cyclones receives wide attention, the extreme weather in the form of hail, lightning and high winds have also caused widespread devastation over India on a small spatial scale in recent years, especially during the period of March to June. India Meteorological Department (IMD) o...

The long-term trends of annual precipitation pattern in the state of Uttarakhand have been presented. The daily rainfall data for 41 stations during 1961 to 2013 have been analysed for the purpose. The t-test was used to get the statistical significance at 95% level for the study of rainfall data of 53 years. The temporal as well as spatial analysi...

A diagnostic study has been carried out to analyse and understand the causes of unusual rainfall activity over Jammu & Kashmir (J&K) State during 2nd to 5th September, 2014. The careful examination of available historical rainfall data of India Meteorological Department (IMD) network reveals that many stations in the region received ever-highest 24...

Unprecedented precipitation along with heavy falls occurred over many parts of India from 28th February to 2nd March 2015. Many of the stations of northwest and central India received an all time high 24 hr cumulative precipitation of March during this period. Even the national capital, New Delhi, broke all the previous historical 24 hr rainfall re...

Spatial and temporal variations in summer and winter extreme temperature indices are studied by using daily maximum and minimum temperatures data from 227 surface meteorological stations well distributed over India for the period 1969–2012. For this purpose, time series for six extreme temperature indices namely, hot days (HD), very hot days (VHD),...

This study has examined the temporal variation in monthly, seasonal & annual precipitation over the Western Himalayan Region (WHR) and the influence of global teleconnections, like the North Atlantic Oscillation (NAO) and Southern Oscillation (SO) Indices on seasonal & annual precipitation. The Mann–Kendall non-parametric test is applied for trend...

Change in rainfall pattern and its impact on the water resources is one of the important climatic problem. There are many studies in the literature that indicate about the change in rainfall pattern globally (De Luís et al. 2000; Hulme et al. 1998; Rodríguez-Puebla et al. 1998). Many studies carried out in India also showed variability in the rainf...

An attempt has been made to identify the synoptic weather situations associated with Western Disturbances (WDs) that caused heavy to very heavy precipitation resulting in extensive avalanches during winter season 2011 over Western Himalayan region (WHR). Analysis suggest that heavy to very heavy precipitation events generally occurs in association...

To predict extreme weather correctly has always been a challenge for operational forecaster. Recent enhancement in observational network and development of new forecasting tools & techniques has helped in increasing the understanding of weather, eventually enabling the forecaster to provide better forecast services. In India, about 80% of its annua...

Monthly, seasonal and annual trends in surface air temperature have been examined over northeast India (NEI) for the period 1901-2007. To study the surface air temperature variations in more detail, it has been further analysed by dividing into smaller periods viz. 10 and 30 years periods. Trend analysis of data is carried out by using parametric a...

The Himalayas have an important role in Indian weather and climate, since they control the western disturbances (WDs) during winter and the southwest monsoon during summer. During the winter months (December to March), westerly winds associated with WDs cause precipitation, sometimes along with heavy snowfall, extensive avalanches, etc., over Himac...

The Himalayas have an important role in Indian weather and climate, since they control the western disturbances (WDs) during winter and the southwest monsoon during summer. During the winter months (December to March), westerly winds associated with WDs cause precipitation, sometimes along with heavy snowfall, extensive avalanches, etc., over Himac...

Climate change worries the scientific community world over as the surface air temperature increased by 0.74oC during 1906-2005. The impacts of warming in mountainous regions get magnified because of large variations in altitude within small distance. This study focuses on the variability and trends of air temperature and rainfall during 1951-2010 i...

An understanding of temporal variation in rainfall distribution is key requirement for the agricultural planning and management of water resources. Bihar is an eastern state in India, where agricultural activities mainly depends on the rainfall. Any change in rainfall distribution may strongly impact the agriculture of this region. Long term rainfa...

Intra-annual and intra-seasonal rainfall are analysed by Precipitation Concentration Index (PCI) over India as a whole and dividing it into five regions namely; northwest, west-central, central northeast, northeast and peninsular India for the period 1871 to 2011. Trend analysis of PCI series has been carried out by using non- parametric Mann Kenda...

Generally, November is the dry month with sunny days and pleasant weather for plains of northwest & west India with a bit of early morning chill as the month progresses. But during November, 2010, there was unusual weather in the form of prolonged and persistent cloudy conditions with wet spell over northwest & west India. To find out the physical...

Horizontal surface visibility range, one of the simplest measures of local atmospheric pollution, is critical for aviation, surface transport besides long-term impact on human health and climate. Long-term observations from multiple stations (including airports) across the world show statistically significant decline in visibility. We have studied...

The present study examines the characteristics and climatological features of daily rainfall data over Andaman & Nicobar Islands. Analysis of rainfall data reveals a large monthly deviation over the northern latitudes as compare to southern latitudes of Andaman & Nicobar Islands. Also, it is found that rainfall increases from north to south latitud...

A severe cyclonic storm (SCS), AILA crossed West Bengal coast of India near Sagar Island between 0800 and 0900 UTC of 25th May 2009 with wind speed of 100 to 110 kmph. The lowest estimated central pressure was about 967 hPa at the time of landfall. It caused loss of about 100 human lives in west Bengal and 175 over Bangladesh. Apart from other aspe...

The studies related to the variation in extreme weather like heavy rainfall are very important as these events has major impacts on environment and cause considerable damage throughout the world each year. Manton et al. (2001) studied the trends in extreme daily rainfall and temperature in southeast Asia and the south Pacific and found decline tren...

A two- layer model has been developed assuming a steady, non- rotating and frictionless flow of vertically unbounded Boussinesq fluid across 2-D profile of Western Ghats of India. Further, it is assumed that lower layer is inviscid with neutral stability (N=0) and upper layer has constant static stability with respect to height, given by N= Constan...

The year 2007 showed increased cyclonic activity over the Bay of Bengal, compared to recent years with the formation of nine cyclonic disturbances. Out of these disturbances, two cyclonic storms, including a very severe cyclonic storm “SIDR”, formed over the Bay of Bengal. This system crossed Bangladesh coast around 1700 UTC of 15 November 2007. Th...

Four cyclonic storms including a super cyclonic storm (Gonu) formed over the north Indian Ocean during 2007. The first ever super cyclonic storm Gonu developed over the Arabian Sea as per the history recorded by IMD since 1877. It made its first landfall over Oman as a very severe cyclonic storm, and then emerged into the Gulf of Oman and made a se...

A very severe cyclonic storm crossed southwest coast of Myanmar near latitude 16.0°N between 1200 and 1400 UTC of 2 May 2008. It caused loss of more than 22,000 human lives in Myanmar. The special features of “Nargis” are given below. (i) The system continued to intensify even after the recurvature. (ii) The system moved almost in the easterly dire...

The 26th July 2005 exceptionally heavy rainfall event over Mumbai has been mainly attributed to a mesoscale low/vortex off Konkan coast and urban heat island (UHI) effect as demonstrated by various research groups. However, these studies are limited on observational evidence regarding the existence of the mesoscale vortex and UHI prior to and durin...

The Central Observatory of India Meteorological Department (IMD) at Palace Road, Bangalore reported a record highest monthly rainfall of 604 mm during October, 2005. It was the highest ever monthly rainfall recorded over Bangalore city. However, the surrounding stations in Bangalore district recorded less rainfall. To find out the physical processe...

A two-dimensional hydrostatic, rotating, frictionless and Boussinesq flow associated with mountain wave for wind with shear has been considered. An integral expression for the mountain drag is developed over a bell- shaped mountain ridge. The integral expression has been evaluated using the asymptotic technique. The mountain drag depends on the det...

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A linear hydrostatic model of a stably stratified upwind profile for backward linear shear with a critical level (the wind speed U = 0 ) over a two-dimensional orographic barrier having two infinitely long ridges is considered. Analytical expressions for the mountain wave drag, energy flux and surface pressure perturbation are obtained. The results...

A two-dimensional meso-scale model has been considered to study mountain drag, momentum and energy fluxes across Khasi-Jayantia hills of India. The general expressions for mountain drag, momentum and energy fluxes are derived for stratified rotating fluid. It is found that decrease of wind speed reduces the magnitude of mountain drag, momentum and...