WATCHES: Tornado Watch Number 109

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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