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RISAssimilating Vortex Position with an Ensemble Kalman Filter
Publisher: American Meteorological Society
Abstract: Observations of hurricane position, which in practice might be available from satellite or radar imagery, can be easily assimilated with an ensemble Kalman filter (EnKF) given an operator that computes the position of the ...
Spiral Bands in a Simulated Hurricane. Part I: Vortex Rossby Wave Verification
Publisher: American Meteorological Society
Abstract: An initially axisymmetric hurricane was explicitly simulated using the high-resolution PSU?NCAR nonhydrostatic mesoscale model (MM5). Spiral potential vorticity (PV) bands that formed in the model were analyzed. It was ...
Asymmetric Structures in a Simulated Landfalling Hurricane
Publisher: American Meteorological Society
Abstract: Highly asymmetric structures in a landfalling hurricane can lead to the formation of heavy rains, wind gusts, and tornados at prefered locations relative to the center of the hurricane. In this study, the development of ...
Spiral Bands in a Simulated Hurricane. Part II: Wave Activity Diagnostics
Publisher: American Meteorological Society
Abstract: The theory of empirical normal modes (ENMs) was applied in a diagnostic study of the inner spiral bands formed in a simulated hurricane using the high-resolution Pennsylvania State University?National Center for Atmospheric ...
A Multiscale Numerical Study of Hurricane Andrew (1992). Part VI: Small-Scale Inner-Core Structures and Wind Streaks
Publisher: American Meteorological Society
Abstract: The objectives of Part VI of this series of papers are to (a) simulate the finescale features of Hurricane Andrew (1992) using a cloud-resolving grid length of 2 km, (b) diagnose the formation of small-scale wind streaks, ...
Impact of Assimilating Microwave Radiances with a Limited-Area Ensemble Data Assimilation System on Forecasts of Typhoon Morakot
Publisher: American Meteorological Society
Abstract: wo parallel experiments were designed to evaluate whether assimilating microwave radiances with a cyclic, limited-area ensemble adjustment Kalman filter (EAKF) could improve track, intensity, and precipitation forecasts ...
The Weather Research and Forecasting Model's Community Variational/Ensemble Data Assimilation System: WRFDA
Publisher: American Meteorological Society
Abstract: milation is the process by which observations are combined with short-range NWP model output to produce an analysis of the state of the atmosphere at a specified time. Since its inception in the late 1990s, the multiagency ...
Four-Dimensional Variational Data Assimilation for WRF: Formulation and Preliminary Results
Publisher: American Meteorological Society
Abstract: The Weather Research and Forecasting (WRF) model?based variational data assimilation system (WRF-Var) has been extended from three- to four-dimensional variational data assimilation (WRF 4D-Var) to meet the increasing ...
Prediction of Landfalling Hurricanes with the Advanced Hurricane WRF Model
Publisher: American Meteorological Society
Abstract: Real-time forecasts of five landfalling Atlantic hurricanes during 2005 using the Advanced Research Weather Research and Forecasting (WRF) (ARW) Model at grid spacings of 12 and 4 km revealed performance generally competitive ...