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Particularly Dangerous Situation (PDS) Severe Thunderstorm Watch 807
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WW0807 Radar
Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.
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   SEL7
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   SEVERE THUNDERSTORM WATCH NUMBER 807
   NWS STORM PREDICTION CENTER NORMAN OK
   715 PM CDT MON AUG 4 2008
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
   
          NORTHEAST ILLINOIS
          NORTHWEST INDIANA
          EXTREME SOUTHWEST LOWER MICHIGAN
          LAKE MICHIGAN
   
   EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 715 PM UNTIL
   200 AM CDT.
   
   ...THIS IS A PARTICULARLY DANGEROUS SITUATION...
   
   EXTREMELY DAMAGING THUNDERSTORM WIND GUSTS TO 90 MPH...LARGE HAIL
   TO 2 INCHES IN DIAMETER...AND DANGEROUS LIGHTNING ARE POSSIBLE IN
   THESE AREAS.
   
   THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50
   STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES WEST
   SOUTHWEST OF MEIGS FIELD ILLINOIS TO 30 MILES SOUTHEAST OF SOUTH
   BEND INDIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
   ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).
   
   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 806...
   
   DISCUSSION...DEVELOPING INTENSE BOW ECHO IN NRN IL WILL LIKELY MOVE
   THROUGH THE CHICAGO AREA INTO NW INDIANA DURING THE NEXT FEW HOURS. 
   THE MCS SHOULD MAINTAIN INTENSITY MOVING ALONG A GRADIENT OF EXTREME
   INSTABILITY ACROSS NE IL INTO NW INDIANA.  VERY DAMAGING WINDS WILL
   BE POSSIBLE IN A NARROW SWATH INCLUDING CHICAGO...ALONG WITH AN
   ISOLATED/BRIEF TORNADO AND LARGE HAIL.
   
   AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
   TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 80
   KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM
   MOTION VECTOR 28050.
   
   
   ...THOMPSON
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Page last modified: August 05, 2008
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