

963 

WWUS20 KWNS 082319

SEL9

SPC WW 082319

OKZ000-TXZ000-090500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 489

NWS STORM PREDICTION CENTER NORMAN OK

620 PM CDT THU AUG 8 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  PARTS OF SOUTHERN AND CENTRAL OKLAHOMA

  PARTS OF NORTH TEXAS



* EFFECTIVE THIS THURSDAY NIGHT FROM 620 PM UNTIL MIDNIGHT CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS WITH A FEW SIGNIFICANT GUSTS TO 75

    MPH POSSIBLE

  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2

    INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH OF

OKLAHOMA CITY OKLAHOMA TO 65 MILES SOUTHWEST OF SHERMAN TEXAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 487...WW 488...



DISCUSSION...THUNDERSTORMS CONTINUE TO SLOWLY ORGANIZE ACROSS

WESTERN NORTH TEXAS...AS A WEAK VORTICITY MAXIMUM SHIFTS

NORTHEASTWARD ACROSS THIS AREA TOWARD SOUTHWESTERN OKLAHOMA.  WITH A

MOIST/MODERATELY UNSTABLE AIRMASS IN PLACE -- PARTICULARLY NORTH OF

THE RED RIVER...EXPECT STORMS TO CONTINUE TO INCREASE/ORGANIZE OVER

THE NEXT FEW HOURS.  AIDED BY MODERATE SHEAR...POTENTIAL FOR UPSCALE

GROWTH INTO BOWING CLUSTERS IS EVIDENT...WITH ATTENDANT THREATS FOR

DAMAGING WINDS AND LARGE HAIL THROUGH THE EVENING HOURS.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65

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

MOTION VECTOR 24035.





...GOSS

