Weather and Forecasting: Recent submissions
Now showing items 1781-1800 of 3043
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Impacts of Satellite-Observed Winds and Total Precipitable Water on WRF Short-Range Forecasts over the Indian Region during the 2006 Summer Monsoon
(American Meteorological Society, 2009)Assimilation experiments have been performed with the Weather Research and Forecasting (WRF) model?s three-dimensional variational data assimilation (3DVAR) scheme to assess the impacts of NASA?s Quick Scatterometer ... -
The Method for Object-Based Diagnostic Evaluation (MODE) Applied to Numerical Forecasts from the 2005 NSSL/SPC Spring Program
(American Meteorological Society, 2009)The authors use a procedure called the method for object-based diagnostic evaluation, commonly referred to as MODE, to compare forecasts made from two models representing separate cores of the Weather Research and Forecasting ... -
The Impacts of AMMA Radiosonde Data on the French Global Assimilation and Forecast System
(American Meteorological Society, 2009)The high vertical density soundings recorded during the 2006 African Monsoon Multidisciplinary Analysis (AMMA) campaign are assimilated into the French numerical weather prediction Action de Recherche Petite Echelle Grande ... -
Energy Transformation and Diabatic Processes in Developing and Nondeveloping African Easterly Waves Observed during the NAMMA Project of 2006
(American Meteorological Society, 2009)This paper provides an understanding of essential differences between developing and nondeveloping African easterly waves, which was a major goal of NAMMA, NASA?s field program in the eastern Atlantic, which functioned as ... -
Synoptic-Scale Flow and Valley Cold Pool Evolution in the Western United States
(American Meteorological Society, 2009)Valley cold pools (VCPs), which are trapped, cold layers of air at the bottoms of basins or valleys, pose a significant problem for forecasters because they can lead to several forms of difficult-to-forecast and hazardous ... -
Evaluation of Distributed Collaborative Adaptive Sensing for Detection of Low-Level Circulations and Implications for Severe Weather Warning Operations
(American Meteorological Society, 2010)The Center for Collaborative Adaptive Sensing of the Atmosphere (CASA) is a multiyear engineering research center established by the National Science Foundation for the development of small, inexpensive, low-power radars ... -
Weather Forecasts by the WRF-ARW Model with the GSI Data Assimilation System in the Complex Terrain Areas of Southwest Asia
(American Meteorological Society, 2009)This paper will first describe the forecasting errors encountered from running the National Center for Atmospheric Research (NCAR) mesoscale model (the Advanced Research Weather Research and Forecasting model; ARW) in the ... -
The Role of Long-Term Trends in Seasonal Predictions: Implication of Global Warming in the NCEP CFS
(American Meteorological Society, 2009)This paper analyzes long-term surface air temperature trends in a 25-yr (1982?2006) dataset of retrospective seasonal climate predictions made by the NCEP Climate Forecast System (CFS), a model that has its atmospheric ... -
Evaluation of Alberta Hail Growth Model Using Severe Hail Proximity Soundings from the United States
(American Meteorological Society, 2009)A one-dimensional, coupled hail and cloud model (HAILCAST) is tested to assess its ability to predict hail size. The model employs an ensemble approach when forecasting maximum hail size, uses a sounding as input, and can ... -
Temporal Changes in Wind as Objects for Evaluating Mesoscale Numerical Weather Prediction
(American Meteorological Society, 2009)The study describes a method of evaluating numerical weather prediction models by comparing the characteristics of temporal changes in simulated and observed 10-m (AGL) winds. The method is demonstrated on a 1-yr collection ... -
Characteristics of Reprocessed Hydrometeorological Automated Data System (HADS) Hourly Precipitation Data
(American Meteorological Society, 2009)The Hydrometeorological Automated Data System (HADS) is a real-time data acquisition, processing, and distribution system operated by the Office of Hydrologic Development (OHD) of NOAA?s National Weather Service (NWS). The ... -
Application of the Composite Method to the Spatial Forecast Verification Methods Intercomparison Dataset
(American Meteorological Society, 2009)The composite method is applied to verify a series of idealized and real precipitation forecasts as part of the Spatial Forecast Verification Methods Intercomparison Project. The test cases range from simple geometric ... -
A Comparison of Precipitation Forecast Skill between Small Convection-Allowing and Large Convection-Parameterizing Ensembles
(American Meteorological Society, 2009)An experiment has been designed to evaluate and compare precipitation forecasts from a 5-member, 4-km grid-spacing (ENS4) and a 15-member, 20-km grid-spacing (ENS20) Weather Research and Forecasting (WRF) model ensemble, ... -
Prediction of Dry-Season Precipitation in Tropical West Africa and Its Relation to Forcing from the Extratropics
(American Meteorological Society, 2009)Precipitation during the boreal winter dry season in tropical West Africa is rare but occasionally results in significant impacts on the local population. The dynamics and predictability of this phenomenon have been studied ... -
Statistical Analysis of Forecasting Models across the North Slope of Alaska during the Mixed-Phase Arctic Clouds Experiment
(American Meteorological Society, 2009)The National Centers for Environmental Prediction?s (NCEP) Eta Model, the models of the European Centre for Medium-Range Weather Forecasts (ECMWF) and the National Aeronautics and Space Administration?s (NASA) Global ... -
Skill of a Ceiling and Visibility Local Ensemble Prediction System (LEPS) according to Fog-Type Prediction at Paris-Charles de Gaulle Airport
(American Meteorological Society, 2009)A specific event, called a low-visibility procedure (LVP), has been defined when visibility is under 600 m and/or the ceiling is under 60 m at Paris-Charles de Gaulle Airport, Paris, France, to ensure air traffic safety ... -
Climatology of Storm Reports Relative to Upper-Level Jet Streaks
(American Meteorological Society, 2009)Using quasigeostrophic arguments and numerical simulations, past works have developed conceptual models of vertical circulations induced by linear and curved jet streaks. Because jet-induced vertical motion could influence ... -
Development of Skill by Students Enrolled in a Weather Forecasting Laboratory
(American Meteorological Society, 2009)Daily values of forecast scores are evaluated for students in a weather analysis and forecasting class (ATMS 452) offered by the Department of Atmospheric Sciences of the University of Washington during the spring terms ... -
Relationship between Precipitation Forecast Errors and Skill Scores of Dichotomous Forecasts
(American Meteorological Society, 2010)In this paper, the sensitivities of the equitable threat score (ETS) and the true skill score (TSS), obtained with a 2 ? 2 contingency table, to continuous precipitation forecast errors are investigated. Two idealized error ... -
Introduction of the GSI into the NCEP Global Data Assimilation System
(American Meteorological Society, 2009)At the National Centers for Environmental Prediction (NCEP), a new three-dimensional variational data assimilation (3DVAR) analysis system was implemented into the operational Global Data Assimilation System (GDAS) on 1 ...