[LeArc] Weather Watch : 6@ 7/4/2003 2:17:32 PM

[learc@mailman.qth.net]

The following weather message is provided by McDonough County E.S.D.A.


WWUS20 KWNS 041916
SEL6  
SPC WW 041920
ILZ000-INZ000-LMZ000-050100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 636 
NWS STORM PREDICTION CENTER NORMAN OK 
220 PM CDT FRI JUL 4 2003

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

       NORTHERN AND CENTRAL ILLINOIS
       NORTHERN INDIANA
       LAKE MICHIGAN

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 220 PM UNTIL 800
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 60 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 30 MILES WEST SOUTHWEST OF PEORIA
ILLINOIS 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.


OTHER WATCH INFORMATION...CONTINUE...WW 635...


DISCUSSION...AIRMASS HAS BECOME EXTREMELY UNSTABLE ACROSS THE WATCH
AREA WITH MUCAPES TO 5000 J/KG.  WEAK CONVERGENCE ALONG OLD OUTFLOW
BOUNDARIES ACROSS NWRN IL AND NRN IN EXPECTED TO INITIATE RAPID
SEVERE THUNDERSTORM DEVELOPMENT

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 600. MEAN STORM
MOTION VECTOR 26030.


...HALES

;412,0901 415,0844 400,0844 393,0901; 

WWWW