WATCHES: Severe Thunderstorm Watch Number 381

WWUS20 KWNS 221533
SEL1
SPC WW 221533
ILZ000-INZ000-222100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 381
NWS STORM PREDICTION CENTER NORMAN OK
1035 AM CDT TUE JUN 22 2010

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

PARTS OF CENTRAL ILLINOIS
PARTS OF SOUTHERN INDIANA

EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 1035 AM UNTIL
400 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 45
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 70 MILES WEST OF
SPRINGFIELD ILLINOIS TO 30 MILES NORTH NORTHEAST OF LOUISVILLE
KENTUCKY. 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...THUNDERSTORMS DEVELOPED ACROSS CENTRAL IL/NERN MO HAVE
DEVELOPED COLD POOLS AND REAR INFLOW JETS. WITH AIR MASS
WARMING/DESTABILIZING ACROSS THE WATCH...POTENTIAL FOR WIND DAMAGE
EXPECTED TO INCREASE AS STORMS MOVE S OF E.

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 27035.

...HALES

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