2.6 X-band, mobile Doppler radar data collected in a tornadic thunderstorm: Data assimilation experiments

Monday, 27 October 2008: 11:45 AM
North & Center Ballroom (Hilton DeSoto)
Robin L. Tanamachi, Univ. of Oklahoma, Norman, OK ; and L. J. Wicker, D. C. Dowell, H. B. Bluestein, S. J. Frasier, and K. Hardwick

On 4 May 2007, a mobile, dual-polarized, X-band Doppler radar was used to collect volumetric reflectivity and velocity data in a cyclic tornadic thunderstorm that later produced an EF5 tornado near Greensburg, Kansas. Sector scans were collected for a period of over one hour, at elevation angles ranging up to 20 degrees. Contemporaneous data were also collected by the WSR-88D radar at Dodge City, Kansas. These data were assimilated into the Weather Research and Forecasting (WRF) numerical weather prediction model using the Advanced Research WRF (WRF-ARW) model and the ensemble Kalman filter (EnKF) module within the freely available Data Assimilation Research Testbed (WRF/DART) package. Preliminary comparisons of these data assimilation experiments will be presented and their implications for tornadic thunderstorm forecasting discussed.
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