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048 

WWUS20 KWNS 010445

SEL9

SPC WW 010445

OKZ000-011000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 269

NWS STORM PREDICTION CENTER NORMAN OK

1145 PM CDT FRI MAY 31 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  CENTRAL OKLAHOMA



* EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1145 PM

  UNTIL 500 AM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2

    INCHES IN DIAMETER POSSIBLE

  A FEW DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 35

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES NORTHWEST

OF CHICKASHA OKLAHOMA TO 40 MILES SOUTHEAST OF CHANDLER OKLAHOMA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 262...WW 265...WW

266...WW 267...WW 268...



DISCUSSION...VIGOROUS STORM DEVELOPMENT CONTINUES ABOVE A

CONVECTIVELY GENERATED COLD POOL ACROSS CENTRAL OKLAHOMA.  THIS IS

ALONG A MID-LEVEL BAROCLINIC ZONE WHICH MAY LIFT SLOWLY

NORTHWARD...BEFORE SHIFTING BACK SOUTHWARD OVERNIGHT...AS AN UPPER

IMPULSE TURNS EASTWARD OUT OF THE SOUTHERN HIGH PLAINS.  GIVEN THE

CONTINUING PRESENCE OF VERY STEEP MID-LEVEL LAPSE RATES AND SIZABLE

MOST UNSTABLE CAPE...ALONG WITH AMPLE CLOUD BEARING LAYER

SHEAR...THE RISK FOR THUNDERSTORMS WITH SEVERE HAIL...PERHAPS A

COUPLE OF STRONG WIND GUSTS...PERSISTS OVERNIGHT.



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 26030.





...KERR

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