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WWUS20 KWNS 282022

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

