

000 

WWUS20 KWNS 280430

SEL5

SPC WW 280430

IAZ000-MOZ000-281100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 765

NWS STORM PREDICTION CENTER NORMAN OK

1130 PM CDT SUN JUL 27 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL IOWA

       NORTH CENTRAL MISSOURI



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1130 PM UNTIL

600 AM CDT.



HAIL TO 3 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 45

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES EAST

NORTHEAST OF FORT DODGE IOWA TO 30 MILES EAST SOUTHEAST OF

CHILLICOTHE MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE

THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 763...WW 764...



DISCUSSION...LOW LEVEL JET/ISENTROPIC LIFT OVER COLD POOL HAS BEEN

SUFFICIENT FOR ELEVATED THUNDERSTORMS TO DEVELOP. DESPITE STABLE

BOUNDARY LAYER...MUCAPES AROUND 2000 J/KG...STEEP MID LEVEL LAPSE

RATES AND 30-40 KT DEEP LAYER SHEAR SHOULD SUPPORT SOME MID LEVEL

ROTATION IN STORMS...WITH LARGE HAIL AND POSSIBLY WIND DAMAGE.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 33030.





...IMY

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