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Tornado Watch 745
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WW0745 Radar
Hazard Tornadoes EF2+ Tornadoes
Likelihood Moderate Low
Severe Wind 65 kt+ Wind
Moderate Moderate
Severe Hail 2"+ Hail
Moderate Very 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.
   SEL5
   
   URGENT - IMMEDIATE BROADCAST REQUESTED
   TORNADO WATCH NUMBER 745
   NWS STORM PREDICTION CENTER NORMAN OK
   825 PM CDT SUN SEP 27 2009
   
   THE NWS STORM PREDICTION CENTER HAS ISSUED A
   TORNADO WATCH FOR PORTIONS OF 
   
          NORTHERN AND CENTRAL ILLINOIS
          NORTHWEST INDIANA
          SOUTHEAST WISCONSIN
          LAKE MICHIGAN
   
   EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 825 PM UNTIL
   200 AM CDT.
   
   TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
   TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
   
   THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
   MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH OF MILWAUKEE
   WISCONSIN TO 35 MILES SOUTH OF DECATUR ILLINOIS.  FOR A COMPLETE
   DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
   (WOUS64 KWNS WOU5).
   
   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.
   
   DISCUSSION...TSTMS EXPECTED TO INCREASE ALONG COLD FRONT AND ALONG
   PRE-FRONTAL CONFLUENCE AXIS OVER SRN WI/IL...AHEAD OF STRONG/
   AMPLIFYING SHORTWAVE TROUGH NOW OVER SE MN.  ALTHOUGH THE
   PRE-FRONTAL ACTIVITY LIKELY WILL REMAIN SLIGHTLY ELEVATED...
   AND...WITH TIME...LINEAR FORCING FOR ASCENT WILL INCREASE ALONG COLD
   FRONT...FOR THE NEXT FEW HOURS A QUASI-DISCRETE STORM MODE IS
   EXPECTED TO PREVAIL.  GIVEN MAGNITUDE OF DEEP SHEAR /AOA 60
   KTS/...SUPERCELL STRUCTURES LIKELY WILL BE ASSUMED BY ANY SUSTAINED
   UPDRAFTS.  INFLUX OF SOMEWHAT MORE SUBSTANTIAL MOISTURE NOW NEAR STL
   INTO CNTRL/NRN IL STORMS LATER TONIGHT FURTHER SUGGESTS POSSIBLE
   TORNADOES GIVEN FACT THAT FLOW IMMEDIATELY AHEAD OF FRONT SHOULD
   MAINTAIN A SIZABLE SLY COMPONENT BENEATH 50+ KT WLY 700 MB FLOW.
   
   AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
   SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
   GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 350.
   MEAN STORM MOTION VECTOR 26050.
   
   
   ...CORFIDI
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