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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...