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892 

WWUS20 KWNS 282055

SEL2

SPC WW 282055

OKZ000-TXZ000-290400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 572

NWS STORM PREDICTION CENTER NORMAN OK

355 PM CDT TUE JUN 28 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST AND SOUTH-CENTRAL OKLAHOMA

       NORTHEAST AND NORTH-CENTRAL TEXAS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 355 PM UNTIL

1100 PM CDT.



HAIL TO 2.5 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES NORTHEAST

OF PARIS TEXAS TO 15 MILES SOUTH SOUTHWEST OF ARDMORE OKLAHOMA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 570...WW 571...



DISCUSSION...A SMALL CORRIDOR FOR CONCENTRATED SEVERE WEATHER

POTENTIAL APPEARS TO BE DEVELOPING FROM VICINITY OF N-S ORIENTED

OUTFLOW BOUNDARY OVER FAR SERN OK WWD ALONG W-E ORIENTED SYNOPTIC

FRONT WHICH HAS STALLED JUST N OF THE RED RIVER.  MODIFICATION OF

OBSERVED SOUNDINGS AND LATEST MODEL GUIDANCE SUGGEST THAT AIR MASS

IS NEARLY UNCAPPED WITH MLCAPE UPWARDS OF 3000-4000 J/KG.  VERTICAL

SHEAR IS NOT PARTICULARLY STRONG...BUT THE PRESENCE OF THE STRONG

INSTABILITY AND STEEP LAPSE RATES INDICATE A RISK FOR DAMAGING WINDS

AND HAIL WITH ANY STORMS THAT DEVELOP.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 35010.





...MEAD

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