

437 

WWUS20 KWNS 112150

SEL1

SPC WW 112150

ILZ000-INZ000-KYZ000-120500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 381

NWS STORM PREDICTION CENTER NORMAN OK

545 PM EDT THU JUN 11 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST ILLINOIS

       SOUTHERN INDIANA

       WESTERN AND CENTRAL KENTUCKY



EFFECTIVE THIS THURSDAY AFTERNOON AND FRIDAY MORNING FROM 545 PM

UNTIL 100 AM EDT.



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 90 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH NORTHEAST OF

EVANSVILLE INDIANA TO 20 MILES SOUTH SOUTHEAST OF BOWLING GREEN

KENTUCKY.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 375...WW 376...WW

378...WW 379...WW 380...



DISCUSSION...TSTMS EXPECTED TO CONTINUE FORMING INVOF EWD-MOVING UPR

VORT...WHERE BOUNDARY LAYER AIR MASS IS CHARACTERIZED BY

TEMPERATURES IN THE LOWER 80S AND DEWPOINTS IN THE LOW 70S.

COMBINATION OF MOIST LOW LVL ENVIRONMENT...SLIGHTLY-BACKED FLOW

ALONG NW-SE OUTFLOW BOUNDARY/WARM FRONT...WEAK LOW LVL FORCING...AND

40+ KT DEEP WLY SHEAR SUGGEST POTENTIAL FOR SCTD SEMI-DISCRETE

SUPERCELLS WITH HAIL AND POSSIBLY A COUPLE TORNADOES.  STORMS SHOULD

CONSOLIDATE INTO A SMALL CLUSTER LATER THIS EVE...WITH EMBEDDED

SMALL LEWPS CONTINUING TO POSE A POSSIBLE SVR THREAT.



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 26040.





...CORFIDI

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