

186 

WWUS20 KWNS 311936

SEL9

SPC WW 311936

ILZ000-INZ000-KYZ000-MOZ000-010200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 329

NWS STORM PREDICTION CENTER NORMAN OK

235 PM CDT THU MAY 31 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       FAR SOUTHERN ILLINOIS

       SOUTHERN INDIANA

       WESTERN AND CENTRAL KENTUCKY

       A SMALL PART OF SOUTHEAST MISSOURI



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 235 PM UNTIL

900 PM CDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH

NORTHEAST OF LOUISVILLE KENTUCKY TO 35 MILES WEST OF FORT

CAMPBELL KENTUCKY.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



OTHER WATCH INFORMATION...CONTINUE...WW 327...WW 328...



DISCUSSION...STORMS ARE EXPECTED TO CONTINUE TO DEVELOP AND

INTENSIFY ALONG THE LEADING EDGE OF A PRE-FRONTAL BOUNDARY

ASSOCIATED WITH THE SRN EXTENT OF AN MCV MOVING ACROSS SRN IL.  WITH

TEMPERATURES WARMING THE LOW/MID 80S AND DEW POINTS INCREASING INT

HE 55-64 RANGE...THE AIR MASS IS DESTABILIZING WITH CAPE TO 1000

J/KG.  DESPITE MARGINAL INSTABILITY FOR THIS TIME OF YEAR...STRONGER

WINDS ALOFT OVER THE AREA AHEAD OF AN APPROACHING UPPER SHORT WAVE

TROUGH AND ASSOCIATED FAVORABLE VERTICAL SHEAR WILL PROMOTE DEVELOP

OF STRONG/SEVERE STORMS...WITH POTENTIAL TO PRODUCE DAMAGING WIND

GUSTS AND ISOLATED HAIL.



AVIATION...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 450. MEAN STORM

MOTION VECTOR 24030.





...WEISS

