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031 

WWUS20 KWNS 151556

SEL7

SPC WW 151556

ARZ000-MOZ000-OKZ000-152300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 177

NWS STORM PREDICTION CENTER NORMAN OK

1055 AM CDT SUN APR 15 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHERN AND WESTERN ARKANSAS

       SOUTHERN MISSOURI

       EXTREME EASTERN OKLAHOMA



EFFECTIVE THIS SUNDAY MORNING AND EVENING FROM 1055 AM UNTIL 600

PM 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 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 55 MILES SOUTH SOUTHEAST OF

POTEAU OKLAHOMA TO 15 MILES NORTHEAST OF VICHY MISSOURI.  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...THIS TORNADO WATCH REPLACES SEVERE

THUNDERSTORM WATCH NUMBER 176. WATCH NUMBER 176 WILL NOT BE IN

EFFECT AFTER 1055 AM CDT.



DISCUSSION...A BAND OF THUNDERSTORMS HAS BEEN PROGRESSING SLOWLY EWD

AS CELLS MOVE MORE RAPIDLY NEWD WITHIN THE BAND.  SATELLITE IMAGERY

INDICATES AREAS OF THINNING CLOUDS AHEAD OF THE CONVECTION WHICH

WILL PERMIT REGIONS OF ENHANCED HEATING/DESTABILIZATION TO OCCUR

THIS AFTERNOON.  LATEST WIND PROFILER AND VAD DATA EXHIBIT VERY

STRONG WINDS /50 KT OR GREATER IN THE 1-2 KM AGL LAYER/ AND

INCREASING WINDS ALOFT...RESULTING IN VERY STRONG SHEAR/SRH THAT

WILL PROMOTE EMBEDDED SUPERCELLS AND OCCASIONAL SMALL SCALE BOW

ECHOES TO DEVELOP.  THE THREAT FOR DAMAGING WIND GUSTS AND TORNADOES

IS EXPECTED TO INCREASE THIS AFTERNOON.



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 22035.





...WEISS

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