[LeArc] Weather Watch : 6@ 7/18/2003 5:02:56 AM

[learc@mailman.qth.net]

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


WWUS20 KWNS 181001
SEL6  
SPC WW 180930
IAZ000-ILZ000-MOZ000-181500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 756 RESENT 1
NWS STORM PREDICTION CENTER NORMAN OK 
430 AM CDT FRI JUL 18 2003

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

       SOUTHEASTERN IOWA
       CENTRAL AND SOUTHERN ILLINOIS
       NORTHEASTERN MISSOURI

EFFECTIVE THIS FRIDAY MORNING FROM 430 AM UNTIL 1000 AM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 55
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 70 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 30 MILES WEST OF OTTUMWA IOWA TO 45
MILES EAST NORTHEAST OF MOUNT VERNON 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.




DISCUSSION...STORMS ARE EXPECTED TO DEVELOP SEWD AS SHORTWAVE TROUGH
MOVES THROUGH THE AREA. AIR MASS IS MODERATELY UNSTABLE AND DEEP
LAYER SHEAR IS SUFFICIENT FOR SEVERE STORMS. HAIL WILL BE THE MAIN
THREAT AS THE UPDRAFT ROOTS ARE ELEVATED. HOWEVER..IF THE STORMS CAN
INGEST THE MORE UNSTABLE BOUNDARY LAYER AIR...THE THREAT FOR WIND
DAMAGE WOULD INCREASE.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 32025.


...IMY

;420,0930 393,0880 373,0880 400,0930; 

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