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RISBehavoir of a Very Large Number of Constant-Volume Trajectories
Publisher: American Meteorological Society
Abstract: A numerical experiment is performed with the purpose of investigating the behavior of the trajectories of a very large number of constant-volume particles. Practical significance is given to this problem by the possibility ...
Computation of the Wind by Forced Adjustment to the Height Field
Publisher: American Meteorological Society
Abstract: The problem of the forced adjustment of the wind field to the height field is experimentally studied with the Mintz-Arakawa two-level atmospheric general circulation model. In all but one of the experiments, the height ...
Horizontal Advection Schemes of a Staggered Grid—An Enstrophy and Energy-Conserving Model
Publisher: American Meteorological Society
Abstract: For use in a model on the semi-staggered E (in the Arakawa notation) grid, a number of conserving schemes for the horizontal advection are developed and analyzed. For the rotation terms of the momentum advection, the ...
Improvements in Quantitative Precipitation Forecasts with the Eta Regional Model at the National Centers for Environmental Prediction: The 48-km Upgrade
Publisher: American Meteorological Society
Abstract: Since 9 June 1993, the eta coordinate regional model has been run twice daily at the National Centers for Environmental Prediction (NCEP, previously the National Meteorological Center) as the NCEP's ?early? operational ...
Has Hail Suppression in Eastern Yugoslavia Led to a Reduction in the Frequency of Hail?
Publisher: American Meteorological Society
Abstract: An earlier attempt to estimate the effect of hail suppression by silver iodide seeding in eastern parts of Yugoslavia, based on hail-frequency data at stations having professional observers, is extended here. Hail-frequency ...
“Horizontal” Reduction of Pressure to Sea Level: Comparison against the NMC's Shuell Method
Publisher: American Meteorological Society
Abstract: It is suggested that there are two major problems with the ?standard? methods of reducing pressure to sea level based on the surface temperature or the lowest-layer(s) temperature of a numerical model. The first is that ...
Applying a General Analytic Method for Assessing Bias Sensitivity to Bias-Adjusted Threat and Equitable Threat Scores
Publisher: American Meteorological Society
Abstract: Bias-adjusted threat and equitable threat scores were designed to account for the effects of placement errors in assessing the performance of under- or overbiased forecasts. These bias-adjusted performance measures exhibit ...
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Publisher: American Meteorological Society
The Step-Mountain Coordinate: Model Description and Performance for Cases of Alpine Lee Cyclogenesis and for a Case of an Appalachian Redevelopment
Publisher: American Meteorological Society
Abstract: The problem of the pressure gradient force error in the case of the terrain-following (sigma) coordinate does not appear to have a solution. The problem is not one of truncation error in the calculation of space derivatives ...
Eta Model Precipitation Forecasts for a Period Including Tropical Storm Allison
Publisher: American Meteorological Society
Abstract: A step-mountain (eta) coordinate limited-area model is being developed at the National Meteorological Center (NMC) to improve forecasts of severe weather and other mesoscale phenomena. Precipitation forecasts are reviewed ...