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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 851

NWS STORM PREDICTION CENTER NORMAN OK

320 PM CDT SAT SEP 17 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN OKLAHOMA

       PARTS OF THE TEXAS SOUTH PLAINS...WESTERN NORTH TEXAS AND FAR

EASTERN PARTS OF THE TEXAS PANHANDLE

EASTERN PARTS OF THE TEXAS PANHANDLE

EASTERN PARTS OF THE TEXAS PANHANDLE



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 320 PM UNTIL

1100 PM CDT.



HAIL TO 1.7 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 70

STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH

NORTHEAST OF CLINTON OKLAHOMA TO 130 MILES SOUTH 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 850...



DISCUSSION...SCTD TSTMS...INCLUDING A FEW SUSTAINED MULTICELLS AND

POSSIBLY A SUPERCELL OR TWO WITH SVR WIND/HAIL...EXPECTED TO FORM

ALONG CONFLUENCE LINES ALONG AND E OF DRY LINE/LEE TROUGH NOW ARCING

THROUGH PARTS OF THE TX PANHANDLE AND W CNTRL TX.  WHILE MOST OF THE

ACTIVITY SHOULD BE DIURNALLY-DRIVEN...THE STORMS MAY RECEIVE SOME

ENHANCEMENT FROM CONTINUING RETURN OF RICH LOW LVL MOISTURE AND

EXPECTED STRENGTHENING OF SSWLY LLJ THIS EVE.  SOME OF THE STORMS IN

THE NRN PART OF THE WATCH MAY EVOLVE INTO A SMALL MCS TNGT...WITH A

CONTINUING A THREAT FOR ISOLD SVR WIND/HAIL.



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

TO 1.7 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 25025.





...CORFIDI

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