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236 

WWUS20 KWNS 300344

SEL1

SPC WW 300344

OKZ000-301000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 451

NWS STORM PREDICTION CENTER NORMAN OK

1045 PM CDT MON JUL 29 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  WESTERN AND CENTRAL OKLAHOMA



* EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1045 PM

  UNTIL 500 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE



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 40 MILES SOUTHWEST OF CHICKASHA

OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 450...



DISCUSSION...W-E MCS OVER NW OK EXPECTED TO CONTINUE GENERALLY SWD

THROUGH EARLY TUE...DRIVEN MAINLY BY PROPAGATION COMPONENT INTO 40

KT SLY LLJ. GIVEN HIGH PW /AOA 2 IN/ ASSOCIATED WITH LLJ AND STEEP

LAPSE RATES IN VERY WARM RESIDUAL BOUNDARY LAYER JUST ABOVE THE

SFC...THE CONVECTIVE SYSTEM MAY CONTINUE TO PRODUCE ISOLD DMGG WIND

GUSTS HAS IT HAS OVER THE PAST HOUR. REF MCD 1563 FOR FURTHER

DETAILS.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

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

VECTOR 33025.





...CORFIDI

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