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The National Meteorological Center's Quasi-Lagrangian Model for Hurricane Prediction
Publisher: American Meteorological Society
Abstract: A description is presented of the National Meteorological Center's Quasi-Lagrangian Model (QLM), which is used for operational hurricane prediction. The model uses the primitive equations with high horizontal and vertical ...
On the Use of Lower Saturation Criteria for Release of Latent Heat in NWP Models
Publisher: American Meteorological Society
Abstract: In several numerical models the large-scale release of latent heat is evaluated when the mixing ratio q exceeds a certain fraction (SATRH < 1) of its saturation value qs. The predicted mixing ratio at the end of a time ...
A Quasi-Lagrangian Regional Model Designed for Operational Weather Prediction
Publisher: American Meteorological Society
Abstract: A regional numerical weather prediction model is designed using the quasi-Lagrangian method for operational forecasting of synoptic and mesoscale disturbances. The nonlinear advective terms and the total forcing experienced ...
A Multiple-Grid Primitive Equation Model to Simulate the Development of an Asymmetric Hurricane (Isbell, 1964)
Publisher: American Meteorological Society
Abstract: A four-level primitive equation model is integrated to 96 hr. A multiple-grid system is used to increase the resolution near the center of the hurricane. The convective and nonconvective release of latent heat, surface ...
Development of Banded Structure in a Numerically Simulated Hurricane
Publisher: American Meteorological Society
Abstract: The developments of the propagating and the stationary bands in a three-dimensional model of a hurricane (Isbell, 1964) are investigated. Propagating bands in the vertical motion fields in the middle and the upper troposphere ...
A NOTE ON AN IMPROVED QUASI-LAGRANGIAN ADVECTIVE SCHEME FOR PRIMITIVE EQUATIONS
Publisher: American Meteorological Society
Abstract: Numerical results of time integration of divergent barotropic primitive equations by a quasi-Lagrangian advective scheme, without smoothing, show that the proposed model has the desired property of conserving total energy ...
Further Evaluation of the Quasi-Lagrangian Model's Forecast Track Guidance
Publisher: American Meteorological Society
Abstract: A comparison is presented of the forecast track errors in the 1990 North Atlantic hurricane season cases from three operational models. The Quasi-Lagrangian Model (QLM) is a baroclinic model. The National Hurricane Center ...
Evolution of Slantwise Vertical Motions in NCEP’s Mesoscale Eta Model
Publisher: American Meteorological Society
Abstract: Numerical forecasts from the National Centers for Environmental Prediction?s mesoscale version of the ? coordinate?based model, hereafter referred to as MESO, have been analyzed to study the roles of conditional symmetric ...
A New Method of Observed Rainfall Assimilation in Forecast Models
Publisher: American Meteorological Society
Abstract: A method to assimilate observed rain rates in the Tropics for improving initial fields in forecast models is proposed. It consists of a 6-h integration of a numerical forecast model; the specific humidity at every time ...
Use of Satellite-derived Rainfall for Improving Tropical Forecasts
Publisher: American Meteorological Society
Abstract: Sparsity of conventional data over tropical oceans makes it difficult to analyze well the moisture and divergence fields, and therefore the diabatic forcing of the tropical atmosphere is not well predicted in numerical ...