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Severe Thunderstorm Watch 674
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WW0674 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
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   SEL4
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 674
   NWS STORM PREDICTION CENTER NORMAN OK
   535 PM CDT THU SEP 20 2007
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          SOUTHEAST MINNESOTA
          WESTERN AND CENTRAL WISCONSIN
   
   EFFECTIVE THIS THURSDAY AFTERNOON AND FRIDAY MORNING FROM 535 PM
   UNTIL 100 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 60
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 65 MILES WEST
   NORTHWEST OF EAU CLAIRE WISCONSIN TO 65 MILES EAST OF EAU CLAIRE
   WISCONSIN.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).
   
   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 673...
   
   DISCUSSION...SLIGHTLY ELEVATED MCS WITH EMBEDDED SUPERCELLS NOW IN
   THE TWIN CITIES AREA EXPECTED TO CONTINUE GENERALLY E INTO WI
   THROUGH MID EVENING.  ADDITIONAL DEVELOPMENT MAY CONTINUE TO OCCUR
   ON SSW FLANK OF SYSTEM...I.E. IN DIRECTIONAL OF 40+ KT LLJ. 
   RECOVERING AIR MASS ALONG AND N OF WARM FRONT EXTENDING ESE INTO
   CNTRL WI SHOULD ALLOW SVR THREAT TO PERSIST DESPITE FACT THAT
   CONVECTIVE SYSTEM WILL BECOME FARTHER REMOVED FROM GREATEST ELEVATED
   THETA-E INFLOW.  WHILE A TORNADO CANNOT BE RULED OUT...MAIN THREATS
   SHOULD BE WIND/HAIL GIVEN CURRENT AND EXPECTED STORM MODE...AND LESS
   FAVORABLE SFC WARM SECTOR AIR MASS WITH EWD EXTENT.
   FARTHER N...OTHER MORE ELEVATED STORMS EXPECTED TO CONTINUE E ACROSS
   NW WI.  THESE SHOULD WEAKEN AS THEY BECOME FURTHER ELEVATED AND
   INCREASINGLY REMOVED FROM ELEVATED MOIST INFLOW.
   
   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 27035.
   
   
   ...CORFIDI
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Page last modified: September 21, 2007
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