SEL1
SPC WW 282022
IAZ000-KSZ000-MOZ000-290400-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 871
NWS STORM PREDICTION CENTER NORMAN OK
325 PM CDT THU AUG 28 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
PARTS OF SOUTHERN IOWA
PARTS OF EASTERN KANSAS
MUCH OF NORTHERN MISSOURI
EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 325 PM UNTIL
1100 PM CDT.
HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST OF
TOPEKA KANSAS TO 60 MILES EAST NORTHEAST OF KIRKSVILLE MISSOURI.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).
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...AIR MASS AHEAD OF WEAK COLD FRONT IS NOW VERY UNSTABLE
AND WEAKLY CAPPED. THUNDERSTORMS WILL DEVELOP RAPIDLY BOTH ALONG
AND TO THE N OF THE FRONT REMAINDER OF AFTERNOON. WITH SHEAR OF
25-30KT PRIMARY THREAT WILL BE MULTICELLULAR WITH ISOLATED
SUPERCELLS. LARGE HAIL AND LOCAL DAMAGING WINDS WILL BE THE MAIN
CONCERN AS STORMS DEVELOP E AND SE THRU THE EVENING.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 27025.
...HALES
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