[LeArc] Weather Watch : 1@ 7/4/2003 11:28:22 PM

[learc@mailman.qth.net]

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


WWUS20 KWNS 050427
SEL1  
SPC WW 050425
IAZ000-ILZ000-MOZ000-WIZ000-051100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 641 
NWS STORM PREDICTION CENTER NORMAN OK 
1125 PM CDT FRI JUL 4 2003

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

       CENTRAL AND EASTERN IOWA
       NORTHERN AND WESTERN ILLINOIS
       EXTREME NORTHEAST MISSOURI
       SOUTHERN WISCONSIN

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1125 PM
UNTIL 600 AM CDT.

...THIS IS A PARTICULARLY DANGEROUS SITUATION...

EXTREMELY DAMAGING THUNDERSTORM WIND GUSTS TO 80 MPH...LARGE HAIL
TO 2 INCHES IN DIAMETER...AND DANGEROUS LIGHTNING ARE POSSIBLE IN
THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 125 STATUTE MILES
EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF LONEROCK
WISCONSIN TO 40 MILES SOUTH SOUTHWEST OF OTTUMWA IOWA.

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 639...WW 640...


DISCUSSION...THUNDERSTORM CLUSTER NOW DEVELOPING IN NRN/WRN IA
EXPECTED TO EVOLVE INTO A FORWARD-PROPAGATING MCS AS COLD POOL
EVOLVES DURING THE NEXT FEW HOURS.  LARGE SCALE ASCENT SHOULD BE
MAINTAINED/ENHANCED BY GLANCING INFLUENCE OF NRN STREAM IMPULSE NOW
OVER ERN SD. ASSOCIATED BAND OF 40-50 KT WLY MID LEVEL FLOW SHOULD
PROVIDE SUFFICIENT SHEAR FOR EMBEDDED SUPERCELLS WITH BOWING
SEGMENTS/HIGH WINDS.  A BRIEF  TORNADO OR TWO ALSO POSSIBLE...MAINLY
IN WRN PART OF WW EARLY IN THE PERIOD...BUT MAIN THREATS SHOULD BE
REGIONALLY DAMAGING WIND AND HAIL.

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 29040.


...CORFIDI

;432,0880 403,0902 403,0950 432,0930; 
WWWW