WATCHES: Severe Thunderstorm Watch Number 463

WWUS20 KWNS 112042
SEL3
SPC WW 112042
KSZ000-OKZ000-TXZ000-120400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 463
NWS STORM PREDICTION CENTER NORMAN OK
340 PM CDT SAT JUN 11 2011

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

SOUTHWEST KANSAS
NORTHWEST OKLAHOMA AND THE OKLAHOMA PANHANDLE
THE NORTHEAST TEXAS PANHANDLE

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 340 PM UNTIL
1100 PM CDT.

HAIL TO 2 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 75
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES NORTH
NORTHWEST OF ELKHART KANSAS TO 50 MILES SOUTH SOUTHEAST OF ALVA
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.

OTHER WATCH INFORMATION...CONTINUE...WW 462...

DISCUSSION...CONVECTIVE INHIBITION IS WEAKENING ALONG AND N OF A
WARM FRONT IN THE TX PANHANDLE AND WRN OK...WHERE MODERATE
INSTABILITY COINCIDES WITH SUFFICIENT DEEP-LAYER SHEAR FOR
SUPERCELLS. SURFACE-BASED THUNDERSTORM DEVELOPMENT WILL BECOME MORE
PROBABLE IN THE NEXT FEW HOURS...AND THERE WILL BE SOME POTENTIAL
FOR ONGOING ELEVATED STORMS TO ROOT IN THE BOUNDARY LAYER.
OTHERWISE...THE SUPERCELLS IN SE CO COULD EVENTUALLY GROW INTO A
CLUSTER AND MOVE EWD/ESEWD INTO THE WATCH AREA FROM THE W. LARGE
HAIL AND DAMAGING WINDS WILL BE THE MAIN SEVERE THREATS INTO EARLY
TONIGHT.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 28020.

...THOMPSON

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