[LeArc] Weather Watch : 7@ 8/21/02 2:21:09 PM

[learc@mailman.qth.net]

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


WWUS20 KWNS 211926
SEL7  
SPC WW 211925
IAZ000-ILZ000-WIZ000-220100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 627
STORM PREDICTION CENTER NORMAN OK
225 PM CDT WED AUG 21 2002

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

   EASTERN IOWA                               
   NORTHERN ILLINOIS                           
   SOUTHERN WISCONSIN                          

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 225 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 75 STATUTE MILES
EAST AND WEST OF A LINE FROM 20 MILES EAST SOUTHEAST OF BURLINGTON
IOWA TO 45 MILES NORTH OF MADISON 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...AIRMASS NOW VERY UNSTABLE ALONG IA/IL BORDER WITH
MLCAPES IN EXCESS OF 3500 J/KG WITH LITTLE CAP REMAINING.  MID
LEVEL TROUGH AND ASSOCIATED WIND MAX ROTATING ACROSS AREA ATTM. 
RAPID DEVELOPMENT OF SEVERE THUNDERSTORMS EXPECTED REMAINDER OF
AFTERNOON IN WATCH AREA WITH SHEAR PROFILES SUPPORTIVE OF ISOLATED
SUPERCELLS.  DAMAGING WINDS WITH WET MICRO-BURSTS WILL BE PRIMARY
THREAT...PARTICULARLY WITH FORMATION OF SHORT LINES/BOWS.


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 24030.


...HALES

;434,0874 403,0892 403,0921 434,0904;
WWWW