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Tornado Watch 178
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WW0178 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Moderate Low
Severe Wind 65 kt+ Wind
Moderate Low
Severe Hail 2"+ Hail
Moderate Low

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL8
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 178
   NWS STORM PREDICTION CENTER NORMAN OK
   340 PM CDT SUN APR 15 2012
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          EXTREME NORTHERN IOWA
          SOUTHERN MINNESOTA
          WEST CENTRAL WISCONSIN
   
   EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 340 PM UNTIL
   1100 PM CDT.
   
   TORNADOES...HAIL TO 2.5 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 85 STATUTE
   MILES EITHER SIDE OF A LINE FROM 50 MILES SOUTH SOUTHWEST OF
   REDWOOD FALLS MINNESOTA TO 40 MILES EAST SOUTHEAST OF EAU CLAIRE
   WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).
   
   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 177...
   
   DISCUSSION...STORMS ARE STARTING TO INCREASE FROM NWRN IA INTO SWRN
   MN IN ADVANCE OF A STRONG UPPER TROUGH/VORTICITY MAX MOVING NEWD
   TOWARD THE UPPER MS VALLEY.  AIR MASS ALONG AND SOUTH OF THE WARM
   FRONT EXTENDING ACROSS SRN MN INTO WRN WI HAS WARMED DURING THE
   AFTERNOON RESULTING IN MLCAPE OF 1000-1500 J/KG.  VERY STRONG WINDS
   ALOFT AND ASSOCIATED INTENSE VERTICAL SHEAR WILL AID IN STORM
   ORGANIZATION WITH POTENTIAL FOR SUPERCELLS TO DEVELOP...ESPECIALLY
   AS STORMS INTERACT WITH THE WARM FRONT.  LARGE HAIL...DAMAGING WINDS
   AND A FEW TORNADOES WILL BE POSSIBLE WITH STRONGER CELLS AS ACTIVITY
   GRADUALLY SPREADS/DEVELOPS NEWD THROUGH THE EVENING HOURS.
   
   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
   WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
   500. MEAN STORM MOTION VECTOR 21045.
   
   
   ...WEISS
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