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000 

WWUS20 KWNS 220402

SEL1

SPC WW 220402

OKZ000-TXZ000-220800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 161

NWS STORM PREDICTION CENTER NORMAN OK

1100 PM CDT SAT APR 21 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN OKLAHOMA

       A SMALL PART OF NORTHWEST TEXAS



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 1100 PM

UNTIL 300 AM CDT.



HAIL TO 1.5 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 40

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES WEST

NORTHWEST OF ALVA OKLAHOMA TO 45 MILES SOUTHEAST OF CHILDRESS

TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 157...WW 158...WW

159...WW 160...



DISCUSSION...LINE OF INTENSE STORMS CONTINUES TO SHIFT QUICKLY EWD

TOWARDS WRN OK/NWRN TX LATE THIS EVENING.  NARROW MUCAPE AXIS AND

INCREASING CINH INTO WRN OK SUGGESTS THIS BROKEN LINE OF STORMS MAY

WEAKEN OVER WRN OK OVERNIGHT.  HOWEVER...ACTIVITY REMAINS QUITE

ORGANIZED ATTM AND LOW-DEEP LAYER SHEAR IS QUITE STRONG.

THEREFORE...ISOLATED DAMAGING WINDS AND LARGE HAIL MAY ACCOMPANY

THIS ACTIVITY FOR A FEW MORE HOURS BEFORE STORMS DIMINISH TONIGHT.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 26035.





...EVANS

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