WW 619 SEVERE TSTM IL IN KY 051440Z – 052200Z
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 619
NWS STORM PREDICTION CENTER NORMAN OK
940 AM CDT WED SEP 5 2012
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL AND EASTERN ILLINOIS
CENTRAL AND SOUTHERN INDIANA
NORTHERN KENTUCKY
EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 940 AM UNTIL
500 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 90
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH OF
INDIANAPOLIS INDIANA TO 40 MILES WEST SOUTHWEST OF EVANSVILLE
INDIANA. 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.
DISCUSSION...BROKEN SQLN IN S CNTRL IL EXPECTED TO CONTINUE
GENERALLY E OR ESE ACROSS THE REMAINDER OF IL AND INTO PARTS OF
IND/KY LATER TODAY. ACTIVITY IS...IN PART...LIKELY SUPPORTED BY AN
IMPULSE IN THE SRN STREAM JET /EXTENDING ROUGHLY W-E THROUGH CNTRL
PARTS OF KS-MO/. THE SQLN MAY BE ENHANCED LATER THIS MORNING BY
STRONG SFC HEATING AND LIGHT SSELY LOW-LVL FLOW TO ITS EAST. WHILE
AREA WIND PROFILES APPEAR SOMEWHAT DISORGANIZED ATTM...WIND FIELD
EXPECTED TO BECOME MORE FAVORABLE FOR FORWARD-PROPAGATION BY MIDDAY.
COUPLED WITH RELATIVELY STEEP MID LVL LAPSE RATES AND AMPLE LOW-LVL
MOISTURE...SETUP MAY YIELD BOTH DMGG WIND AND SVR 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 500. MEAN STORM
MOTION VECTOR 28030.
...CORFIDI
via SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0619.html
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