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Severe Thunderstorm Watch 473
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WW0473 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Low Very Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate Moderate

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
Note: Click for Watch Status Reports.
   SEL3
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 473
   NWS STORM PREDICTION CENTER NORMAN OK
   1130 PM CDT THU JUN 18 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHEAST ILLINOIS
          NORTHWEST INDIANA
          SOUTHWEST LOWER MICHIGAN
          SOUTHEAST WISCONSIN
          LAKE MICHIGAN
   
   EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1130 PM
   UNTIL 700 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 110
   STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH OF
   MILWAUKEE WISCONSIN TO 15 MILES SOUTHWEST OF VALPARAISO INDIANA. 
   FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
   OUTLINE UPDATE (WOUS64 KWNS WOU3).
   
   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 470...WW 471...WW 472...
   
   DISCUSSION...CLUSTER OF SEVERE STORMS OVER SRN WI WILL LIKELY
   PERSIST AND SPREAD EWD/SEWD OVERNIGHT AS A FEED OF UNSTABLE AIR IS
   MAINTAINED FROM THE W/SW ON A 35 KT LLJ.  THE PRIMARY SEVERE THREAT
   ACROSS SW LOWER MI SHOULD BE LARGE HAIL WITH ELEVATED STORMS.  THE
   THREAT FOR LARGE HAIL AND DAMAGING WINDS WILL BE GREATER FROM SE WI
   INTO NE IL AND NW INDIANA...ESPECIALLY IF STORM MERGERS LEAD TO
   UPSCALE GROWTH OF A COLD POOL AND MORE SEWD PROPAGATION OF THE
   CLUSTER.
   
   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 29025.
   
   
   ...THOMPSON
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