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RISThe Effect of Horizontal Divergence and the Latitudinal Variation of the Coriolis Parameter on the Drift of a Model Hurricane
Publisher: American Meteorological Society
Abstract: The northward drift of a three-dimensional model hurricane is investigated by long-time numerical integrations of non-divergent and divergent barotropic vortices on a ?-plane. Both vortices drifted in a general northward ...
The Initialization of Numerical Models by a Dynamic-Initialization Technique
Publisher: American Meteorological Society
Abstract: A dynamic-initialization technique is tested with three models of fluid flow. In this technique data are assimilated through the inclusion of terms in the forecast equations which force the model atmosphere toward the ...
Dynamic Initialization of a Three-Dimensional Primitive-Equation Model of Hurricane Alma of 1962
Publisher: American Meteorological Society
Abstract: A technique of dynamic initialization previously studied with two-dimensional models is applied to a forecast of Hurricane Alma (1962) over a 24 h period. In the dynamic-initialization experiment, first-guess horizontal ...
An Examination of Nested Grid Model Precipitation Forecasts in the Presence of Moderate-To-Strong Low-Level Southerly Inflow
Publisher: American Meteorological Society
Abstract: The performance of the nested grid model (NGM) in predicting heavy rain is assessed for those cases in the cool season when moderato-to-strong low-level southerly inflow from the Gulf of Mexico is present. This study ...
The Effect of Snow Cover on the Regional Analysis and Forecast System (RAFS) Low-Level Forecasts
Publisher: American Meteorological Society
Abstract: The response of the Regional Analysis and Forecast System (RAFS) low-level forecast fields to the geographical distribution of snow cover is discussed. The errors produced by an improper specification of this field in the ...
Performance of NMC's Regional Models
Publisher: American Meteorological Society
Abstract: This paper details the performance characteristics of the two regional dynamical models used at the National Meteorological Center to forecast for North America. Strengths and weaknesses of these models?the limited-area ...
Seasonal and Geographic Variations in Quantitative Precipitation Prediction by NMC's Nested-Grid Model and Medium-Range Forecast Model
Publisher: American Meteorological Society
Abstract: This paper assesses the performance of the National Meteorological Center (NMC) Nested-Grid Model (NGM) during a period from March 1988 through March 1990, and the NMC medium-range forecast model (MRF) in two 136-day tests, ...
The Regional Analysis and Forecast System of the National Meteorological Center
Publisher: American Meteorological Society
Abstract: The three components of the Regional Analysis and Forecast System (RAFS) of the National Meteorological Center (NMC) are described. This system was implemented in March 1985 to supplement guidance from NMC's limited-area ...
Changes to NMC's Regional Analysis and Forecast System
Publisher: American Meteorological Society
Abstract: The recent implementation of changes to the National Meteorological Center's (NMC's) Regional Analysis and Forecast System (RAFS) is described. The changes include an expansion of the innermost grids of the nested-grid ...