Barbara Casati

Barbara Casati
Environment Canada | EC · Research Division of Weather and Meteorology

About

41
Publications
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1,271
Citations

Publications

Publications (41)
Article
Full-text available
There are few commonly used indicators that describe the state of Earth’s global hydrological cycle and here we propose three indicators to capture how an increased greenhouse effect influences the global hydrological cycle and the associated rainfall patterns. They are: i) the 24-hr global total rainfall, ii) the global surface area with daily pre...
Article
The International Verification Methods Workshop was held online in November 2020 and included sessions on physical error characterization using process diagnostics and error tracking techniques; exploitation of data assimilation techniques in verification practices, e.g., to address representativeness issues and observation uncertainty; spatial ver...
Article
From 16 November 2018 to 15 February 2019, the Year of Polar Prediction (YOPP) in the Southern Hemisphere (SH) held a special observing period (SOP). YOPP is a flagship activity of the Polar Prediction Project (PPP), a 10- year (2013–22) WMO/WWRP initiative. Seventeen nations contributed to greatly enhanced observations during the SOP—primarily fro...
Article
Full-text available
Verification of forecasts and warnings of high-impact weather is needed by the meteorological centres, but how to perform it still presents many open questions, starting from which data are suitable as reference. This paper reviews new observations which can be considered for the verification of high-impact weather and provides advice for their usa...
Article
Full-text available
Citation: Mariani, Z.; Hicks-Jalali, S.; Strawbridge, K.; Gwozdecky, J.; Crawford, R.W.; Casati, B.; Lemay, F.; Lehtinen, R.; Tuominen, P. Evaluation of Arctic Water Vapor Profile Observations from a Differential Absorption Lidar. Remote Sens. 2021, 13, 551.
Preprint
Full-text available
Verification of high-impact weather is needed by the Meteorological Centres, but how to perform it still presents many open questions, starting from which data are suitable as reference. This paper reviews new observations which can be considered for the verification of high-impact weather, and provides advice for their usage in objective verificat...
Article
Assessing the quality of precipitation forecasts requires observations, but all precipitation observations have associated uncertainties making it difficult to quantify the true forecast quality. One of the largest uncertainties is due to the wind-induced undercatch of solid precipitation gauge measurements. This study discusses how this impacts th...
Article
Full-text available
The Year of Polar Prediction in the Southern Hemisphere (YOPP-SH) had a special observing period (SOP) that ran from 16 November 2018 to 15 February 2019, a period chosen to span the austral warm season months of greatest operational activity in the Antarctic. Some 2,200 additional radiosondes were launched during the 3-month SOP, roughly doubling...
Article
Full-text available
This study compares the accuracy of visually estimated ice concentrations by eight analysts at the Canadian Ice Service with three standards: (i) ice concentrations calculated from automated image segmentation, (ii) ice concentrations calculated from automated image segmentation that were validated by the analysts, and (iii) the modal ice concentra...
Article
As part of the second phase of the spatial forecast verification Inter-Comparison Project (ICP), dubbed the Mesoscale Verification Intercomparison in Complex Terrain (MesoVICT) project, a new set of idealized test fields is prepared. This paper describes these new fields and their rationale, and uses them to analyze a number of summary measures ass...
Article
The goal of the Canadian Arctic Weather Science (CAWS) project is to conduct research into the future operational monitoring and forecasting programs of Environment and Climate Change Canada in the Arctic where increased economic and recreational activities are expected with enhanced transportation and search and rescue requirements. Due to cost, r...
Article
Full-text available
This study compares the accuracy of visually estimated ice concentrations by eight analysts at the Canadian Ice Service against three standards: i) ice concentrations calculated from automated image segmentation, ii) ice concentrations calculated from automated image segmentation that were validated by the analysts, and iii) the modal ice concentra...
Article
Full-text available
Increased human activity in the Arctic calls for accurate and reliable weather predictions. This study presents an intercomparison of operational and/or high-resolution models in an attempt to establish a baseline for present-day Arctic short-range forecast capabilities for near-surface weather (pressure, wind speed, temperature, precipitation, and...
Article
When predicting thunderstorms and localized severe weather events, close calls occur more frequently than direct hits. This makes it difficult for traditional verification approaches to fully represent forecast performance since events observed near a forecast event are counted both as misses and false alarms. Timing and location relative to the af...
Article
Full-text available
Recent advancements in numerical weather prediction (NWP) and the enhancement of model resolution have created the need for more robust and informative verification methods. In response to these needs, a plethora of spatial verification approaches have been developed in the past two decades. A spatial verification method intercomparison was establi...
Article
Full-text available
The fifth Workshop on Systematic Errors (WSE) in weather and climate models was hosted by Environment and Climate Change Canada (ECCC) on under the auspices of the Working Group on Numerical Experimentation (WGNE), jointly sponsored by the Commission of Atmospheric Sciences of the World Meteorological Organization (WMO) and the World Climate Resear...
Poster
Full-text available
Re-analysis aims at providing long-term, high-resolution, dynamically consistent climate datasets useful for environmental applications. Usually, these datasets cover a time period of several decades and they assimilate high-quality and detailed observations into the atmospheric analysis. In UERRA, a FP7 research project of the EU, several regional...
Conference Paper
Full-text available
An accurate representation of the precipitation field available on a hourly basis at high spatial resolution is of paramount importance for climatological, meteorological and hydrological applications. On the Norwegian mainland, most applications require a reliable representation of the atmospheric dynamics down to the lower bound of the Meso-scale...
Article
Full-text available
What: 120 scientists, stakeholders, and representatives from operational forecasting centers, international bodies, and funding agencies assembled to make significant advances in the planning of the Year of Polar Prediction; When: 13-15 July 2015; Where: WMO Headquarters, Geneva, Switzerland
Article
Full-text available
Background: Most studies that have assessed impacts on mortality of future temperature increases have relied on a small number of simulations and have not addressed the variability and sources of uncertainty in their mortality projections. Objectives: We assessed the variability of temperature projections and dependent future mortality distribut...
Article
Future climate projections of extreme events can help forewarn society of high-impact events and allow the development of better adaptation strategies. In this study a non-stationary model for Generalized Extreme Value (GEV) distributions is used to analyze the trend in extreme temperatures in the context of a changing climate and compare it with t...
Article
Full-text available
Public health planning needs the support of evidence-based information on current and future climate, which could be used by health professionals and decision makers to better understand and respond to the health impacts of extreme heat. Climate models provide information regarding the expected increase in temperatures and extreme heat events with...
Article
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Not Available Bibtex entry for this abstract Preferred format for this abstract (see Preferences) Find Similar Abstracts: Use: Authors Title Return: Query Results Return items starting with number Query Form Database: Astronomy Physics arXiv e-prints
Article
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1 INTRODUCTION As atmospheric models are developed and refined, it is imperative to have objective ways to evaluate forecast quality. This is important for comparing different model configurations or tracking performance over time. Greater computing power has allowed finer grid spacing and more explicit handling of previously unresolved circulation...
Article
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Half-hourly GPS zenith tropospheric delay (ZTD) and collocated surface weather observations of pressure, temperature, and relative humidity are available in near–real time from the NOAA Global Systems Division (GSD) research GPS receiver network. These observations, located primarily over the continental United States, are assimilated in a research...
Article
Accurate prediction of rare high-impact events represents a major challenge for weather and climate forecasting. Assessment of the skill at forecasting such events is problematic because of the rarity of such events. Skill scores traditionally used to verify deterministic forecasts of rare binary events, such as the equitable threat score (ETS), ha...
Article
Full-text available
Research and development of new verification strategies and reassessment of traditional forecast verification methods has received a groat deal of attention from the scientific community in the last decade. This scientific effort has arisen from the need to respond to changes encompassing several aspects of the verification process, such as the evo...
Conference Paper
Full-text available
An accurate simulation of rainfall at local scale and at high temporal resolution is needed for many climate change impact studies. The statistical downscaling (SD) techniques are often used to perform this simulation taking into account their relative simplicity. One performance criterion associated to SD rainfall simulation is the spatial-tempora...
Article
Full-text available
A new scale decomposition of the Brier score for the verification of probabilistic forecasts defined on a spatial domain is introduced. The technique is illustrated on the Canadian Meteorological Centre (CMC) lightning probability forecasts. Probability forecasts of lightning occurrence in 3-h time windows and 24-km spatial resolution are verified...
Article
A new intensity-scale method for verifying spatial precipitation forecasts is introduced. The technique provides a way of evaluating the forecast skill as a function of precipitation rate intensity and spatial scale of the error. Six selected case studies of the UK Met Office now-casting system NIMROD are used to illustrate the method. The forecast...
Article
Novel verification techniques for evaluating the skill in forecasting extreme and rare events are presented. The verification techniques are tested on eight selected case studies of the UK Met Office now-casting system NIMROD. Hourly rainfall rate forecasts at 3-hour lead times are verified against NIMROD analysis, both on a spatial grid with 5 km...
Article
Novel verification techniques for evaluating spatial precipitation forecasts on different spatial scales and thresholds are presented. The verification techniques are tested on eight carefully selected representative case studies of the UK Met Office nowcasting system NIMROD. Hourly precipitation rate 3-hour lead time forecasts on a spatial grid wi...
Article
Full-text available
Research and development of new verification strategies and reassessment of traditional forecast verification methods has received a great deal of attention from the scientific community in the last decade. This scientific effort has arisen from the need to respond to changes encompassing several aspects of the verification process, such as the evo...
Article
Extreme weather events can cause large damages and losses, and have high societal and economical impacts. Climate model integrations predict increases in both frequency and intensity of extreme events under enhanced greenhouse conditions. Better understanding of the capabilities of climate models in representing the present climate extremes, joint...
Article
Full-text available
A new scale decomposition of the Brier score for evaluating spatial probabilistic forecasts is presented. The tech-nique is illustrated on the Canadian Meteorological Center (CMC) lightning probabilistic forecasts. Probability fo-recasts of lightning rate for 3 hour time windows and 22 km spatial resolution are verified against lightning frequen-ci...
Article
Full-text available
Thesis (Ph.D.)--University of Reading, 2004.

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