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Displaying AFOS PIL: SEL4 Product Timestamp: 2003-05-10 10:50 UTC
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000
WWUS20 KWNS 101046
SEL4
SPC WW 101050
ILZ000-MOZ000-101600-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 334
NWS STORM PREDICTION CENTER NORMAN OK
550 AM CDT SAT MAY 10 2003
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
CENTRAL AND WESTERN ILLINOIS
EAST CENTRAL AND NORTHEAST MISSOURI
EFFECTIVE THIS SATURDAY MORNING FROM 550 AM UNTIL 1100 AM 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 100 STATUTE MILES
EAST AND WEST OF A LINE FROM 60 MILES NORTHEAST OF QUINCY ILLINOIS
TO 50 MILES SOUTHWEST OF SAINT LOUIS 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...CONTINUE...WW 332...WW 333...
DISCUSSION...EVOLVING MCS OVER MO SHOULD CONTINUE TO DEVELOP ENEWD
TOWARD CENTRAL IL ALONG AND N OF THE SURFACE WARM FRONT. MUCAPE
VALUES OF 1500-2000 J/KG AND STRONG WAA N OF THE FRONT WILL SUPPORT
WIDESPREAD THUNDERSTORM DEVELOPMENT...THE STRONGEST OF WHICH COULD
PRODUCE LARGE HAIL. IN ADDITION...VERTICAL SHEAR THROUGH THE CLOUD
LAYER WILL BE SUFFICIENT FOR A FEW SUPERCELLS...WHICH WILL ENHANCE
THE SEVERE THREAT.
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 24035.
...THOMPSON
403,0882 381,0891 381,0925 403,0921