

151 

WWUS20 KWNS 302052

SEL6

SPC WW 302052

ILZ000-INZ000-KYZ000-OHZ000-WVZ000-310400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 316

NWS STORM PREDICTION CENTER NORMAN OK

450 PM EDT SAT MAY 30 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHERN ILLINOIS

       PARTS OF SOUTHERN INDIANA

       PARTS OF NORTHERN AND EASTERN KENTUCKY

       PARTS OF SOUTHERN OHIO

       PARTS OF WESTERN WEST VIRGINIA



EFFECTIVE THIS SATURDAY AFTERNOON FROM 450 PM UNTIL MIDNIGHT EDT.



HAIL TO 2 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES SOUTHWEST

OF DECATUR ILLINOIS TO 35 MILES SOUTH SOUTHEAST OF HUNTINGTON

WEST VIRGINIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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.



DISCUSSION...THUNDERSTORMS EXPECTED TO INCREASE IN NUMBER AND

INTENSITY ACROSS THE WATCH AREA AS AIR MASS CONTINUES TO DESTABILIZE

UNDER STRONG HEATING.  WITH 35-45KT OF SHEAR AND MLCAPES AOA 2000

J/KG...SEVERE THUNDERSTORMS INCLUDING POSSIBLE SUPERCELLS ARE

LIKELY.  PRIMARY THREAT WILL BE LARGE HAIL AND DAMAGING WINDS

PARTICULARLY WITH ANY SUPERCELL AND LINE SEGMENTS  THAT DEVELOP.



AVIATION...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 27030.





...HALES

