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128 

WWUS20 KWNS 301754

SEL2

SPC WW 301754

OKZ000-310300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 252

NWS STORM PREDICTION CENTER NORMAN OK

1255 PM CDT THU MAY 30 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  CENTRAL AND EASTERN OKLAHOMA



* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1255 PM

  UNTIL 1000 PM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL INTENSE TORNADOES POSSIBLE

  SEVERAL VERY LARGE HAIL EVENTS TO 3 INCHES IN DIAMETER LIKELY

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES EAST OF WICHITA FALLS

TEXAS TO 25 MILES NORTH OF TULSA OKLAHOMA.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU2).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 250...WW 251...



DISCUSSION...TRAILING EXTENSION OF MCS OVER N-CNTRL OK HAS RECENTLY

INTENSIFIED AND SHOULD CONTINUE TO TRACK ALONG OUTFLOW BOUNDARY OVER

NERN OK.  MEANWHILE...ADDITIONAL STORMS ARE DEVELOPING ALONG THE

DRYLINE INTO CNTRL OK WHERE THE CAP HAS BECOME WEAK WITH MLCAPE OF

2000-3000 J/KG.  GIVEN THE STRONG DEEP-LAYER SHEAR IN PLACE AND AT

LEAST MODESTLY STRONG LOW-LEVEL SHEAR...THE POTENTIAL WILL EXIST FOR

INTENSE SUPERCELLS CAPABLE OF VERY LARGE HAIL AND TORNADOES.  A FEW

OF THE TORNADOES COULD BE SIGNIFICANT.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 27025.





...MEAD

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