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WWUS20 KWNS 230135

SEL4

SPC WW 230135

IAZ000-MOZ000-230700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 54

NWS STORM PREDICTION CENTER NORMAN OK

835 PM CDT TUE MAR 22 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF SOUTHERN IOWA

       LARGE PART OF NORTHERN MISSOURI



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 835 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 30 MILES NORTHEAST OF OTTUMWA

IOWA TO 5 MILES SOUTH SOUTHEAST OF CHILLICOTHE MISSOURI.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU4).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 53. WATCH NUMBER 53 WILL NOT BE IN EFFECT AFTER 835

PM CDT.



DISCUSSION...LINE OF SEVERE THUNDERSTORMS WILL MOVE EWD ACROSS WATCH

AREA THRU THE EVENING. WITH VERY STRONG SHEAR PROFILES...MARGINAL

BUT SUFFICIENT INSTABILITY IS AVAILABLE TO MAINTAIN THE THREAT OF

EMBEDDED SUPERCELLS/TORNADOES WITHIN THE LINE. IN ADDITION DAMAGING

WINDS ARE LIKELY...PARTICULARLY IN BOWING SEGMENTS.



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

450. MEAN STORM MOTION VECTOR 24035.





...HALES

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