

310 

WWUS20 KWNS 251844

SEL3

SPC WW 251844

INZ000-KYZ000-260100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 623

NWS STORM PREDICTION CENTER NORMAN OK

240 PM EDT SAT JUL 25 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME SOUTHEASTERN INDIANA

       CENTRAL AND EASTERN KENTUCKY



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 240 PM UNTIL

900 PM EDT.



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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES WEST

SOUTHWEST OF LOUISVILLE KENTUCKY TO 40 MILES EAST OF JACKSON

KENTUCKY.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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...A LINE OF THUNDERSTORMS WERE DEVELOPING ALONG THE FRONT

ACROSS EXTREME SERN INDIANA. THESE STORMS ARE EXPECTED TO INTENSIFY

AHEAD OF AN UPPER IMPULSE MOVING EWD THROUGH ERN MO AND AS THE AIR

MASS CONTINUES TO WARM AND DESTABILIZE. STRENGTHENING WLY WINDS

ALOFT WILL BE FAVORABLE FOR THIS LINE OF STORMS TO INCREASE IN

FORWARD SPEED...WITH DAMAGING WINDS EXPECTED TO BE THE PRIMARY

THREAT.



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 500. MEAN STORM

MOTION VECTOR 28030.





...IMY

