WATCHES: Tornado Watch Number 326

WWUS20 KWNS 221849
SEL6
SPC WW 221849
OKZ000-TXZ000-230200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 326
NWS STORM PREDICTION CENTER NORMAN OK
150 PM CDT SUN MAY 22 2011

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

CENTRAL OKLAHOMA
NORTH-CENTRAL TEXAS

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 150 PM UNTIL 900
PM CDT.

TORNADOES...HAIL TO 4 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES NORTH NORTHWEST OF
MCALESTER OKLAHOMA TO 40 MILES SOUTH SOUTHWEST OF MINERAL WELLS
TEXAS. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION...CONTINUE...WW 321...WW 322...WW
323...WW 324...WW 325...

DISCUSSION...ISOLATED STORM DEVELOPMENT IS ANTICIPATED ALONG THE
DRYLINE BY LATE AFTERNOON AS CONTINUED DAYTIME HEATING ERODES
REMAINING CONVECTIVE INHIBITION. 18Z FWD SOUNDING SHOWED THAT THE
WARM SECTOR IS ALREADY EXTREMELY UNSTABLE WITH MLCAPE VALUES
APPROACHING 5000 J/KG. THIS DEGREE OF INSTABILITY COUPLED WITH
35-40 KT OF DEEP-LAYER SHEAR WILL SUPPORT INTENSE SUPERCELLS CAPABLE
OF DESTRUCTIVE HAIL. THE THREAT FOR TORNADOES WILL INCREASE THIS
EVENING AS LOW-LEVEL SHEAR INTENSIFIES IN RESPONSE TO THE
DEVELOPMENT OF A SLY LLJ.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 27020.

...MEAD

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