MESOSCALE DISCUSSION 0858 NWS STORM PREDICTION CENTER NORMAN OK 0259 PM CDT SUN MAY 22 2011 AREAS AFFECTED...SERN MN...ERN IA...WRN WI...NWRN IL CONCERNING...TORNADO WATCH 322...323...327... VALID 221959Z - 222200Z THE SEVERE WEATHER THREAT FOR TORNADO WATCH 322...323...327...CONTINUES. THE TORNADO THREAT INCREASING ACROSS THE AREA. LATEST RADAR TRENDS SHOW STORMS BEGINNING TO SHOW MORE CLASSIC SUPERCELL STRUCTURE WITH INTENSIFYING MESOCYCLONES. NOW THAT STORMS HAVE BECOME ESTABLISHED...THEY WILL BE ABLE TO TAKE ADVANTAGE OF THE ENVIRONMENT WHICH IS QUITE UNSTABLE WITH AMPLE SHEAR FOR TORNADOES. AREA WIND PROFILERS AND VADS SHOW A FAVORABLE SHEAR ENVIRONMENT FOR STRONG TORNADOES...ESPECIALLY OVER NERN IA..SERN MN...WRN WI...AND EVENTUALLY FAR NWRN IL. THE ENVIRONMENT WILL CONTINUE TO BECOME MORE FAVORABLE FARTHER E INTO CNTRL WI AND NRN IL AS MID 60S BOUNDARY LAYER DEWPOINTS STREAM NWD.
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