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653 

WWUS20 KWNS 272027

SEL7

SPC WW 272027

ARZ000-ILZ000-INZ000-KYZ000-MOZ000-TNZ000-280400-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 237

NWS STORM PREDICTION CENTER NORMAN OK

330 PM CDT WED APR 27 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHEAST ARKANSAS

       SOUTHERN ILLINOIS

       SOUTHERN INDIANA

       WESTERN KENTUCKY

       SOUTHEAST MISSOURI INCLUDING THE BOOTHEEL

       WEST TENNESSEE



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 330 PM UNTIL

1100 PM CDT.



TORNADOES...HAIL TO 2.5 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 75 STATUTE

MILES EAST AND WEST OF A LINE FROM 30 MILES WEST NORTHWEST OF

EVANSVILLE INDIANA TO 45 MILES SOUTH OF JACKSON TENNESSEE.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU7).



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 231...WW 232...WW

233...WW 234...WW 235...WW 236...



DISCUSSION...DISCRETE THUNDERSTORM DEVELOPMENT IS OCCURRING OVER

NORTHEAST AR AND WEST TN...IN REGION WHERE SUBSTANTIAL LOW LEVEL

DESTABILIZATION IS OCCURRING.  GIVEN THE APPROACH OF DEEP SURFACE

LOW...POTENTIAL IS INCREASING FOR TORNADIC SUPERCELLS AS FAR NORTH

AS THE LOWER OH RIVER VALLEY THROUGH THE EVENING.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 24035.





...HART

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