

312 

WWUS20 KWNS 192338

SEL3

SPC WW 192338

OKZ000-TXZ000-200600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 183

NWS STORM PREDICTION CENTER NORMAN OK

640 PM CDT THU APR 19 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH CENTRAL OKLAHOMA

       WESTERN NORTH TEXAS



EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 640 PM

UNTIL 100 AM 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 55

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

MINERAL WELLS TEXAS TO 20 MILES NORTHEAST OF OKLAHOMA CITY

OKLAHOMA.  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.



DISCUSSION...THUNDERSTORMS ARE BEGINNING TO FORM ALONG SURFACE COLD

FRONT/DRYLINE OVER WESTERN NORTH TX...AND ARE EXPECTED TO FORM IN

THE NEXT 1-2 HOURS OVER PARTS OF SOUTHWEST OK.  THIS ACTIVITY WILL

BE IN A REGION OF RELATIVELY WEAK LOW LEVEL SHEAR.  BUT...SUFFICIENT

EFFECTIVE SHEAR VALUES AND MODERATE CAPE WILL PROMOTE SUPERCELL

STRUCTURES CAPABLE OF LARGE HAIL AND DAMAGING WINDS.  ACTIVITY MAY

PERSIST NEAR THE RED RIVER FOR MUCH OF THE EVENING.



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 27030.





...HART

