[LeArc] Weather Watch : 4@ 5/8/2003 9:07:40 PM

[learc@mailman.qth.net]

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


WWUS20 KWNS 090207
SEL4  
SPC WW 090210
IAZ000-ILZ000-090800-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 314 
NWS STORM PREDICTION CENTER NORMAN OK 
910 PM CDT THU MAY 8 2003

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

       NORTHEAST IOWA
       NORTHERN AND CENTRAL ILLINOIS

EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 910 PM UNTIL
300 AM 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 ALONG AND 65 STATUTE MILES
EAST AND WEST OF A LINE FROM 25 MILES EAST NORTHEAST OF DUBUQUE
IOWA TO 25 MILES SOUTHWEST OF DECATUR ILLINOIS.

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 308...WW 309...WW 310...WW
311...WW 312...WW 313...


DISCUSSION...STRONG WARM ADVECTION COUPLED WITH RAPIDLY INCREASING
ELEVATED INSTABILITY WILL SUPPORT SEVERE THUNDERSTORMS TO SPREAD EWD
TO N OF WARM FRONT.  ELEVATED SUPERCELLS WILL ENHANCE THE LARGE HAIL
THREAT.

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 500. MEAN STORM
MOTION VECTOR 24040.


...HALES

;423,0885 393,0875 393,0902 423,0913; 
WWWW