May 22- Tornado Watch #322

URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 322
   NWS STORM PREDICTION CENTER NORMAN OK
   1210 PM CDT SUN MAY 22 2011
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          NORTHEAST IOWA
          SOUTHEAST MINNESOTA
          WESTERN WISCONSIN
   
   EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 1210 PM UNTIL
   800 PM CDT.
   
   TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND
   GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
   AREAS.
   
   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
   MILES NORTH AND SOUTH OF A LINE FROM 55 MILES NORTHWEST OF
   MANKATO MINNESOTA TO 45 MILES EAST OF LA CROSSE WISCONSIN.  FOR A
   COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
   UPDATE (WOUS64 KWNS WOU2).
   
   REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
   TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
   AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
   THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
   AND POSSIBLE WARNINGS.
   
   OTHER WATCH INFORMATION...CONTINUE...WW 321...
   
   DISCUSSION...SRN FRINGE OF ELEVATED TSTMS ONGOING ACROSS SERN MN/WRN
   WI MAY BECOME PROGRESSIVELY SURFACE BASED THIS AFTERNOON OWING TO
   THE RAPID NWD FLUX OF 60+ F DEWPOINTS ALONG AND S OF WARM FRONT. 
   ADDITIONAL STORM DEVELOPMENT WILL BE POSSIBLE ALONG WARM AND COLD
   FRONTS ASSOCIATED WITH SURFACE LOW MOVING FROM E-CNTRL SD TOWARD
   CNTRL MN.  ENHANCED LOW-LEVEL SHEAR AHEAD OF SURFACE LOW COUPLED
   WITH THE MOISTENING/DESTABILIZING AIR MASS WILL SUPPORT SUPERCELLS
   CAPABLE OF LARGE HAIL AND TORNADOES.
   
   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
   WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
   500. MEAN STORM MOTION VECTOR 23030.