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Severe Thunderstorm Watch 470
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WW0470 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
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.
   SEL0
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 470
   NWS STORM PREDICTION CENTER NORMAN OK
   735 PM CDT THU JUN 18 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          CENTRAL MINNESOTA
          NORTHWEST WISCONSIN
          LAKE SUPERIOR
   
   EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 735 PM
   UNTIL 200 AM CDT.
   
   HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
   MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
   STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES WEST
   NORTHWEST OF KENNEDY WISCONSIN TO 5 MILES SOUTHWEST OF EAU CLAIRE
   WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).
   
   REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
   FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
   DO PRODUCE TORNADOES.
   
   OTHER WATCH INFORMATION...CONTINUE...WW 464...WW 465...WW
   466...WW 467...WW 468...WW 469...
   
   DISCUSSION...CONVECTION WILL CONTINUE TO SPREAD EWD ALONG THE
   SYNOPTIC WARM FRONT FROM MN INTO NW WI THIS EVENING INTO TONIGHT. 
   MODERATE INSTABILITY IS PRESENT ALONG AND S OF THE BOUNDARY...WHILE
   DEEP LAYER VERTICAL SHEAR IS SUFFICIENT FOR ORGANIZED CONVECTIVE
   SYSTEMS...INCLUDING SUPERCELLS AND BOW ECHOES.  THE PRIMARY SEVERE
   THREATS APPEAR TO BE DAMAGING WINDS AND HAIL AS CONVECTION
   CONSOLIDATES ACROSS MN AND THEN MOVES EWD/ESEWD ALONG THE
   INSTABILITY GRADIENT INTO WI.  A SOMEWHAT COOLER BOUNDARY LAYER
   COMPARED TO AREAS FARTHER S/SW...AND ONLY MODEST LOW-LEVEL SHEAR IN
   00Z OBSERVATIONS AND SHORT-TERM MODEL FORECASTS SUGGEST THAT THE
   TORNADO THREAT WILL BE RATHER LIMITED INTO NW WI.
   
   AVIATION...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 550. MEAN STORM
   MOTION VECTOR 28035.
   
   
   ...THOMPSON
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