SEL4
SPC WW 261927
ILZ000-INZ000-KYZ000-MOZ000-270200-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 744
NWS STORM PREDICTION CENTER NORMAN OK
230 PM CDT SAT SEP 26 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
PARTS OF SOUTHERN ILLINOIS
SMALL PART OF SOUTHWEST INDIANA
MUCH OF WESTERN KENTUCKY
PARTS OF SOUTHEAST MISSOURI
EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 230 PM UNTIL
900 PM CDT.
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 75
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES EAST
NORTHEAST OF SALEM ILLINOIS TO 35 MILES SOUTH SOUTHEAST OF
PADUCAH KENTUCKY. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).
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 INCREASING IN NUMBER AND INTENSITY AHEAD
OF UPPER LOW MOVING EWD ACROSS MO. SUFFICIENT DEEP LAYER SHEAR
COUPLED WITH MLCAPES TO 1000 J/KG TO SUPPORT SEVERE THUNDERSTORMS.
PRIMARY THREAT WILL BE LARGE HAIL AND LOCALLY DAMAGING DOWNBURST
WINDS AS STORMS MOVE/DEVELOP EWD.
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 450. MEAN STORM
MOTION VECTOR 25025.
...HALES
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