92nd American Meteorological Society Annual Meeting (January 22-26, 2012)

Tuesday, 24 January 2012: 1:30 PM
Hybrid Ensemble-3DVar Radar Data Assimilation with the NCEP GSI Assimilation System and the Non-Hydrostatic Multiscale Model on the B-Grid
Room 340 and 341 (New Orleans Convention Center )
Jacob R. Carley, Purdue University, West Lafayette, IN; and D. F. Parrish, M. E. Baldwin, and S. Liu

The National Weather Service currently uses 3DVar for operational data assimilation under the framework of the Gridpoint Statistical Interpolation system (GSI). Recently, the GSI has been extended to include a hybrid ensemble-3DVar assimilation capability and is undergoing testing for operational implementation. While the GSI can currently assimilate radial velocity data from WSR-88D radars, it does not yet use a variational treatment to assimilate radar reflectivity factor. Assimilating both wind and reflectivity data, however, has been demonstrated to be beneficial for improving storm-scale analyses.

This talk will focus on the development of a hybrid-ensemble 3DVar radar data assimilation and prediction system with the NCEP GSI and the Non-hydrostatic Multiscale Model on the B-grid - the model which (at the time of writing) will replace the WRF-NMM as the North American Mesoscale model (NAM). Preliminary results from a case study will be presented.

Supplementary URL: