National Weather Service Raw Text Product

000 
WWUS20 KWNS 040947
SEL0  
SPC WW 040950
IAZ000-ILZ000-MOZ000-041600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 230 
NWS STORM PREDICTION CENTER NORMAN OK 
450 AM CDT SUN MAY 4 2003

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

       SOUTHERN IOWA
       WESTERN ILLINOIS
       NORTHERN AND CENTRAL MISSOURI

EFFECTIVE THIS SUNDAY MORNING FROM 450 AM UNTIL 1100 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 115 STATUTE MILES
EAST AND WEST OF A LINE FROM 65 MILES NORTH OF LAMONI IOWA TO 20
MILES SOUTHEAST OF FORT LEONARD WOOD MISSOURI.

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...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 229. WATCH NUMBER 229 WILL NOT BE
IN EFFECT AFTER 450 AM CDT. 


DISCUSSION...ELEVATED WARM ADVECTION STORMS EXPECTED TO SPREAD E
ACROSS WW AREA THROUGH LATE THIS MORNING AS 850 WARM FRONT
STRENGTHENS OVER REGION.  COUPLED WITH INCREASING CLOUD LAYER
SHEAR...POTENTIAL MAY INCREASE FOR A FEW SUPERCELLS WITH LARGE HAIL
AND POSSIBLY DAMAGING WIND.

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 500. MEAN STORM
MOTION VECTOR 25035.


...CORFIDI

413,0914 373,0894 373,0935 413,0960