

700 

WWUS20 KWNS 142308

SEL9

SPC WW 142308

OKZ000-TXZ000-150600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 579

NWS STORM PREDICTION CENTER NORMAN OK

605 PM CDT TUE AUG 14 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN AND SOUTHERN OKLAHOMA

       NORTHERN TEXAS



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 605 PM

UNTIL 100 AM CDT.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75

MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55

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

ALTUS OKLAHOMA TO 60 MILES EAST SOUTHEAST OF DURANT OKLAHOMA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



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.



DISCUSSION...TSTMS EXPECTED TO PERSIST AND POSSIBLY INCREASE IN

COVERAGE/STRENGTH ACROSS WW AREA THROUGH MID-LATE EVE AS REGION IS

GLANCED BY ASCENT ASSOCIATED WITH KS/MO SHORTWAVE IMPULSE.

FORWARD-PROPAGATING DEVELOPMENT/OCCASIONAL BOWING STRUCTURES MAY BE

FOSTERED IN SW OK BY ELY LOW LVL FLOW INVOF SWD-MOVING W-E BOUNDARY.

 MORE WDLY SCTD ACTIVITY WITH A POTENTIAL FOR LOCALLY DMGG WIND MAY

OCCUR FARTHER SE...INVOF WEAK NWD-MOVING W-E FRONT IN N TX AND S

CNTRL OK...WHERE SOMEWHAT GREATER MOISTURE RESIDES WITHIN INVERTED-V

THERMODYNAMIC ENVIRONMENT.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

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

MOTION VECTOR 29025.





...CORFIDI

