

000 

WWUS20 KWNS 060022

SEL7

SPC WW 060022

IAZ000-MOZ000-060700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 237

NWS STORM PREDICTION CENTER NORMAN OK

720 PM CDT SAT MAY 5 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN IOWA

       NORTHWEST MISSOURI



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 720 PM

UNTIL 200 AM CDT.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHEAST OF

SPENCER IOWA TO 50 MILES SOUTHWEST OF LAMONI IOWA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU7).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 232...WW 234...WW

235...WW 236...



DISCUSSION...ISOLATED TSTMS NOW FORMING IN NW MO AND SW IA EXPECTED

TO MOVE/DEVELOP MAINLY NNE THIS EVENING.  STRONGLY BACKED NEAR-SFC

FLOW...DECOUPLING OF LLJ...FAIRLY RICH MOISTURE ENVIRONMENT AND 40

KT DEEP SWLY SHEAR SUGGEST POTENTIAL FOR SUPERCELLS WITH

HAIL/TORNADOES DESPITE LOSS OF DAYTIME HEATING.



AVIATION...TORNADOES AND 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 21040.





...CORFIDI

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