

545 

WWUS20 KWNS 021940

SEL9

SPC WW 021940

ILZ000-INZ000-KYZ000-TNZ000-030100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 109

NWS STORM PREDICTION CENTER NORMAN OK

240 PM CDT THU APR 2 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EXTREME SOUTHEAST ILLINOIS

       SOUTHWEST INDIANA

       WESTERN AND CENTRAL KENTUCKY

       NORTHERN MIDDLE TENNESSEE



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 240 PM UNTIL

800 PM CDT.



TORNADOES...HAIL TO 1.5 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 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 5 MILES WEST NORTHWEST OF

EVANSVILLE INDIANA TO 15 MILES SOUTH SOUTHWEST OF NASHVILLE

TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 105...WW 106...WW

107...WW 108...



DISCUSSION...SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP THIS

AFTERNOON FROM MIDDLE TN NWD INTO WRN KY IN ADVANCE OF A LEAD

SHORTWAVE TROUGH EJECTING NEWD FROM THE LOWER MS VALLEY.  THE HPX

VWP SHOWS FAVORABLE HODOGRAPH CURVATURE AND DEEP LAYER SHEAR FOR

SUPERCELLS...WHILE INSTABILITY AND MOISTURE ARE AT LEAST SUFFICIENT

FOR A TORNADO OR TWO.  OTHERWISE...LARGE HAIL AND A FEW DAMAGING

GUSTS WILL BE THE MAIN SEVERE THREATS ALONG AND S OF THE PRIMARY

BAROCLINIC ZONE NEAR THE OH RIVER.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 24035.





...THOMPSON

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