SEL1
SPC WW 021729
ILZ000-INZ000-KYZ000-MOZ000-030100-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 321
NWS STORM PREDICTION CENTER NORMAN OK
1225 PM CDT TUE JUN 2 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL AND SOUTHERN ILLINOIS
EXTREME SOUTHWESTERN INDIANA
FAR NORTHWESTERN KENTUCKY
EASTERN MISSOURI
EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1225 PM UNTIL
800 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 75
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES SOUTH
SOUTHWEST OF QUINCY ILLINOIS TO 55 MILES SOUTHEAST OF MATTOON
ILLINOIS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).
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...STORMS ARE DEVELOPING AHEAD OF UPPER LEVEL IMPULSES
LOCATED IN FAR SERN IA AND SWRN MO. AIR MASS HAS BECOME MODERATELY
UNSTABLE AND MLCAPES WILL APPROACH 3000 J/KG BY LATE AFTERNOON. THIS
INSTABILITY ALONG WITH 20-30 KT DEEP LAYER SHEAR WILL FAVOR SEVERE
MULTICELL SEVERE STORMS WITH HAIL AND DAMAGING WINDS.
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 24020.
...IMY
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