[LeArc] Weather Watch : 7@ 7/31/2003 12:01:57 PM

[learc@mailman.qth.net]

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


WWUS20 KWNS 311700
SEL7  
SPC WW 311700
IAZ000-ILZ000-WIZ000-LMZ000-312300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 817 
NWS STORM PREDICTION CENTER NORMAN OK 
1200 PM CDT THU JUL 31 2003

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

       NORTHEAST IOWA
       EXTREME NORTHWEST ILLINOIS
       SOUTHERN AND CENTRAL WISCONSIN
       LAKE MICHIGAN

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1200 PM UNTIL
600 PM 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 60 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 10 MILES SOUTH SOUTHWEST OF
WATERLOO IOWA TO 35 MILES EAST SOUTHEAST OF OSHKOSH WISCONSIN.

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 CONTINUE TO INTENSIFY OVER EXTREME SOUTHEAST MN
INTO VERY UNSTABLE AIR MASS WHERE SBCAPE IS AROUND 3000 J/KG. 
ALSO...A BOUNDARY FROM THE CONVECTION OVER NEB IS MOVING EWD OVER
CENTRAL IA WHICH IS EXPECTED TO ENHANCE LIFT IN THE VICINITY OF THE
FRONT MOVING SEWD TOWARDS SWRN WI.  STORMS WILL CONTINUE TO
INTENSIFY/DEVELOP POTENTIALLY PRODUCING LARGE HAIL AND DAMAGING
WINDS.

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 28035.


...MCCARTHY

;431,0922 443,0875 425,0875 413,0922; 
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