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RISA Multiconserving Discretization with Enthalpy as a Thermodynamic Prognostic Variable in Generalized Hybrid Vertical Coordinates for the NCEP Global Forecast System
Publisher: American Meteorological Society
Abstract: new vertical discretization used in the atmospheric dynamics of the National Centers for Environmental Prediction (NCEP) Global Forecast System (GFS) is illustrated, with enthalpy as the thermodynamic prognostic variable ...
A Reduced Spectral Transform for the NCEP Seasonal Forecast Global Spectral Atmospheric Model
Publisher: American Meteorological Society
Abstract: A reduced spectral transformation is applied to the NCEP atmospheric global spectral model for operational seasonal forecasts. The magnitude of the associated Legendre coefficient provides a basis for this new transformation, ...
Numerical Simulations of the Evolution of a Cold Front and Its Precipitation
Publisher: American Meteorological Society
Abstract: Short-range (36-h) simulations of a surface cold front that occurred over the Great Plains of the United States during the SESAME-AYE III period are made using a significantly modified version of a hydrostatic, sigma-coordinate, ...
The NCEP Mesoscale Spectral Model: A Revised Version of the Nonhydrostatic Regional Spectral Model
Publisher: American Meteorological Society
Abstract: This paper illustrates a modified nonhydrostatic version of the National Centers for Environmental Prediction regional spectral model (RSM). This nonhydrostatic version of the RSM can simulate atmospheric motions of all ...
A Case Study of Rapid Cyclogenesis over Canada. Part II: Simulations
Publisher: American Meteorological Society
Abstract: Short-range (36 and 48 h) simulations of a rapid cyclogenesis that occurred over Canada in the spring season are made using a significantly modified version of the hydrostatic, sigma-coordinate, quasi-Lagrangian grid model ...
A Case Study of Rapid Cyclogenesis over Canada. Part I: Diagnostic Study
Publisher: American Meteorological Society
Abstract: A diagnostic analysis is made for the rapid development of two subsynoptic scale cyclones that coexisted over Canada in the spring season, using the Level IIIb First GARP Global Experiment dataset assimilated by the European ...
The NMC Nested Regional Spectral Model
Publisher: American Meteorological Society
Abstract: A nested primitive equation regional spectral model is developed. The model consists of two components?a low-resolution global spectral model and a high-resolution regional spectral model. The two components have identical ...
Sensitivity of the NCEP Regional Spectral Model to Domain Size and Nesting Strategy
Publisher: American Meteorological Society
Abstract: This paper evaluates the performance of the National Centers for Environmental Prediction (NCEP) Regional Spectral Model (RSM) based on the sensitivities of different model domain sizes and horizontal resolutions. The ...
Orography Blending in the Lateral Boundary of a Regional Model
Publisher: American Meteorological Society
Abstract: A simple method to employ an orography blending technique near the lateral boundary of the regional model is proposed. The method blends the orography of the regional model on the lateral boundary with that of the global ...
Effects of Transient Eddies on Blocking Flows: General Circulation Model Experiments
Publisher: American Meteorological Society
Abstract: Prediction of blocking flows by a comprehensive general circulation model is still not satisfactory. A large portion of the unskillful forecasts can be traced to the model's inability to predict the evolution of blocking ...