Louis J. Wicker

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Two time-splitting methods for integrating the elastic equations are presented. The methods are based on a third-order Runge–Kutta time scheme and the Crowley advection schemes. The schemes are combined with a forward–backward scheme for integrating high-frequency acoustic and gravity modes to create stable splitexplicit schemes for integrating the(More)
A forward-in-time splitting method for integrating the elastic equations is presented. A second-order Runge– Kutta time integrator (RK2) for the large-time-step integration is combined with the forward–backward scheme in a manner similar to the Klemp and Wilhelmson method. The new scheme produces fully second-order-accurate integrations for advection and(More)
  • Stensrud, Norman, +16 authors Jason P Tuell
  • 2009
National Severe Storms Laboratory, Norman, Oklahoma; Xue—Center for Analysis and Prediction of Storms and School of Meteorology, University of Oklahoma, Norman, Oklahoma; FoSter—NOAA/NWS, Weather Forecast Office, Norman, Oklahoma; SchaeFer and Schneider—NOAA/NWS/ Storm Prediction Center, Norman, Oklahoma; Benjamin and Weygandt—NOAA/Earth System Research(More)
Mobile Doppler radar data, along with observations from a nearby Weather Surveillance Radar-1988 Doppler (WSR-88D), are assimilated with an ensemble Kalman filter (EnKF) technique into a nonhydrostatic, compressible numerical weather prediction model to analyze the evolution of the 4 May 2007 Greensburg, Kansas, tornadic supercell. The storm is simulated(More)
The low levels of supercell forward flanks commonly exhibit distinct differential reflectivity (ZDR) signatures, including the low-ZDR hail signature and the high-ZDR ‘‘arc.’’ The ZDR arc has been previously associated with size sorting of raindrops in the presence of vertical wind shear; here this model is extended to include size sorting of hail.(More)
Progress and challenges with Warn-on-Forecast David J. Stensrud ⁎, Louis J. Wicker , Ming Xue , Daniel T. Dawson II , Nusrat Yussouf , Dustan M. Wheatley , Therese E. Thompson , Nathan A. Snook , Travis M. Smith , Alexander D. Schenkman , Corey K. Potvin , Edward R. Mansell , Ting Lei , Kristin M. Kuhlman , Youngsun Jung , Thomas A. Jones , Jidong Gao ,(More)
Tornadoes are one of nature’s most destructive forces, creating winds that can exceed 300 miles per hour. The sheer destructive power of the strongest class of tornado (EF5) makes these tornadoes the subject of active research. However, very little is currently known about why some supercells produce long-track (a long damage path) EF5 tornadoes, while(More)
1 Center for Analysis and Prediction of Storms, University of Oklahoma, 120 David L. Boren Boulevard, Norman, OK 73072, USA 2NOAA/National Severe Storms Laboratory, National Weather Center, 120 David L. Boren Boulevard, Norman, OK 73072, USA 3 Cooperative Institute for Mesoscale Meteorological Studies, National Weather Center, 120 David L. Boren Boulevard,(More)