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273 

WWUS20 KWNS 120120

SEL6

SPC WW 120120

OKZ000-TXZ000-120700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 146

NWS STORM PREDICTION CENTER NORMAN OK

820 PM CDT SUN MAY 11 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN OKLAHOMA

  PARTS OF NORTHWEST TEXAS



* EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 820 PM

  UNTIL 200 AM CDT.



* PRIMARY THREATS INCLUDE...

  ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE

  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A TORNADO OR TWO POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH

NORTHWEST OF CLINTON OKLAHOMA TO 110 MILES SOUTH SOUTHWEST OF

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 142...WW 143...WW

144...WW 145...



DISCUSSION...CONVECTION IS BEGINNING TO DEVELOP ALONG TWO DRYLINE

SEGMENTS INVOF WRN OK AND THE ERN TX PANHANDLE AS FLOW BACKS TO SELY

ON THE MOIST SIDE OF THE BOUNDARIES...AND LOW-LEVEL MOISTURE SPREADS

NWWD.  VERTICAL SHEAR AND INSTABILITY WILL BE SUFFICIENT FOR

SUPERCELLS...WITH LARGE HAIL AND DAMAGING WINDS THE MAIN THREATS.  A

TORNADO CANNOT BE RULED OUT EARLY TONIGHT AS LOW-LEVEL SHEAR AND

MOISTURE INCREASE ACROSS WRN OK.



AVIATION...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 24025.





...THOMPSON

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