[LeArc] SEVERE THUNDERSTORM WATCH NUMBER 187

[Duane Whittingham]

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 187
NWS STORM PREDICTION CENTER NORMAN OK
100 PM CDT WED APR 30 2003

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

NORTHERN ILLINOIS
NORTHERN INDIANA
LAKE MICHIGAN

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 100 PM UNTIL
600 PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 65 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 10 MILES WEST SOUTHWEST OF
BURLINGTON IOWA TO 20 MILES EAST OF FORT WAYNE INDIANA.

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...WARM FRONT SHIFTING NWD INTO NRN IL/IND AHEAD OF LINE
OF THUNDERSTORMS MOVING EWD FROM IA AHEAD OF UPPER IMPULSE.  AIRMASS
ALONG AND S OF WARM FRONT HAS BECOME VERY UNSTABLE WITH MLCAPES
ABOVE 2500 J/KG.  RAPID DEVELOPMENT OF SEVERE THUNDERSTORMS WILL
OCCUR EWD ACROSS NRN IL AND ALONG AND N OF WARM FRONT INTO NRN IND.
SUFFICIENT SHEAR FOR ISOLATED SUPERCELLS ENHANCING SEVERE THREAT
PARTICULARLY LARGE HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 25035.

...HALES


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Duane Whittingham (N9SSN) - Producer
Tom and Darryl Radio Shows
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