WATCHES: Severe Thunderstorm Watch Number 183

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

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