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WWUS20 KWNS 130024

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 574

NWS STORM PREDICTION CENTER NORMAN OK

720 PM CDT SUN AUG 12 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN OKLAHOMA

       NORTHEAST TEXAS



EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 720 PM UNTIL

100 AM CDT.



HAIL TO 2 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 40

STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES WEST

NORTHWEST OF POTEAU OKLAHOMA TO 50 MILES SOUTH SOUTHEAST OF PARIS

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

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 573...



DISCUSSION...TSTMS FORMING ALONG WSW-ENE PRE-FRONTAL CONFLUENCE LINE

NOW NEAR DURANT OK MAY MOVE/DEVELOP E INTO ADJACENT PARTS OF SE OK

AND POSSIBLY NE TX LATER THIS EVE. WHILE LARGE SCALE FORCING FOR

ASCENT WILL REMAIN WEAK...WEAK CONFLUENCE WILL PERSIST WITHIN FAIRLY

MOIST AND UNSTABLE LOW LVL ENVIRONMENT BENEATH 20-25 KT NWLY MID LVL

FLOW.  THIS SETUP MAY FOSTER A FEW DISCRETE STORMS CAPABLE OF DMGG

WIND AND LARGE HAIL.

FARTHER N...ADDITIONAL ISOLD TO PERHAPS WDLY SCTD STORMS MAY FORM

LATER THIS EVE NEAR COLD FRONT AND PREFRONTAL CONFLUENCE LINE IN NE

OK/FAR SE KS...AND/OR ALONG WEAK WARM FRONT IN NW AR/SW MO. LOW

CONFIDENCE IN THIS SCENARIO SUGGESTS THAT A WW IS UNWARRANTED ATTM

...DESPITE PRESENCE OF AMPLE INSTABILITY/SHEAR FOR SVR STORMS.



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 550. MEAN STORM

MOTION VECTOR 30020.





...CORFIDI

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