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659 

WWUS20 KWNS 032121

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ILZ000-040500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 232

NWS STORM PREDICTION CENTER NORMAN OK

420 PM CDT THU MAY 3 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN ILLINOIS



EFFECTIVE THIS THURSDAY AFTERNOON FROM 420 PM UNTIL MIDNIGHT CDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE

MILES EITHER SIDE OF A LINE FROM 35 MILES NORTH NORTHEAST OF

CHAMPAIGN ILLINOIS TO 65 MILES SOUTH SOUTHWEST OF MOLINE

ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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.



OTHER WATCH INFORMATION...CONTINUE...WW 229...WW 230...WW 231...



DISCUSSION...STORMS ARE FORECAST TO DEVELOP WITHIN INSTABILITY AXIS

ORIENTED ALONG REMNANT OUTFLOW BOUNDARY ACROSS WRN IL. DEEP-LAYER

SHEAR WILL BE SUPPORTIVE OF STORM ORGANIZATION WITH SUPERCELLS

POSSIBLE. IN ADDITION...RELATIVELY STRONG LOW LEVEL FLOW...AND SOME

BACKING OF THE FLOW ACROSS CNTRL PORTIONS OF IL...MAY RESULT IN A

CORRIDOR OF STRONGER LOW LEVEL SRH THAT COULD ENHANCE THE CHANCE FOR

TORNADOES GIVEN THE MAGNITUDE OF EXISTING INSTABILITY.



AVIATION...TORNADOES AND 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

500. MEAN STORM MOTION VECTOR 25025.





...CARBIN

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