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103 

WWUS20 KWNS 132314

SEL7

SPC WW 132314

IAZ000-KSZ000-MOZ000-140600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 657

NWS STORM PREDICTION CENTER NORMAN OK

610 PM CDT MON SEP 13 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN IOWA

       NORTHEAST KANSAS

       NORTHWEST MISSOURI



EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 610 PM UNTIL

100 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 APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHWEST OF

LAMONI IOWA TO 40 MILES EAST SOUTHEAST OF SAINT JOSEPH MISSOURI.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 655...WW 656...



DISCUSSION...SUPERCELL CLUSTER NOW MOVING SSE FROM THE OMA AREA

EXPECTED TO BE THE DOMINANT MESOSCALE FEATURE FOR THE NEXT FEW HOURS

IN THE LWR MO VLY REGION.  INSTABILITY/SHEAR PATTERNS SUGGEST THAT

COMPLEX SHOULD MOVE MAINLY SEWD.  ADDITIONAL STORM DEVELOPMENT MAY

OCCUR PREFERENTIALLY ON ERN SIDE OF COMPLEX...AND E OF COMPLEX...IF

ASSOCIATED MESOSCALE CIRCULATION ENHANCES WAA/ASCENT ALONG EXISTING

W-E BOUNDARY NOW OVER SRN IA.  DEGREE OF INSTABILITY AND MODEST BUT

SUFFICIENT DEEP SHEAR FOR SUSTAINED STORMS/SUPERCELLS SUGGEST THREAT

FOR HIGH WIND/SVR HAIL...AND POSSIBLY A BRIEF TORNADO OR TWO.



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 550. MEAN STORM

MOTION VECTOR 30030.





...CORFIDI

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