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130 

WWUS20 KWNS 132137

SEL3

SPC WW 132137

OKZ000-TXZ000-140500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 313

NWS STORM PREDICTION CENTER NORMAN OK

440 PM CDT SUN JUN 13 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHWEST OKLAHOMA

       LARGE PART OF SOUTHWEST TEXAS



EFFECTIVE THIS SUNDAY AFTERNOON FROM 440 PM UNTIL MIDNIGHT 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTHWEST OF

ALTUS OKLAHOMA TO 45 MILES SOUTHEAST OF FORT STOCKTON TEXAS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU3).



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 309...WW 310...WW

311...WW 312...



DISCUSSION...WITH A VERY UNSTABLE ...MLCAPES AOA 3000 J/KG...AND

UNCAPPED AIR MASS E OF DRY LINE IN WRN TX...STORMS EXPECTED TO

INCREASE IN NUMBER AND INTENSITY THRU THE EVENING.  SUFFICIENT SHEAR

GIVEN THE AMOUNT OF INSTABILITY TO SUPPORT SUPERCELLS WHICH WOULD

ENHANCE BOTH THE LARGE HAIL AND DAMAGING WIND POTENTIAL.



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 600. MEAN STORM

MOTION VECTOR 22020.





...HALES

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