Wednesday, June 10, 2009

WATCHES: Severe Thunderstorm Watch Number 364

WWUS20 KWNS 101612
SEL4
SPC WW 101612
OKZ000-TXZ000-102300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 364
NWS STORM PREDICTION CENTER NORMAN OK
1110 AM CDT WED JUN 10 2009

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

WESTERN OKLAHOMA
EASTERN TEXAS PANHANDLE

EFFECTIVE THIS WEDNESDAY MORNING AND EVENING FROM 1110 AM UNTIL
600 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 65
STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES SOUTHWEST OF
CLINTON OKLAHOMA TO 15 MILES NORTH OF ALVA OKLAHOMA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU4).

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 363...

DISCUSSION...ELEVATED CLUSTER OF TSTMS IS EXPECTED TO BECOME
PROGRESSIVELY SURFACE-BASED THIS AFTERNOON AS BOUNDARY LAYER
WARMS/DESTABILIZES. THE COMBINATION OF MODERATE INSTABILITY AND
STRENGTHENING VERTICAL SHEAR SHOULD SERVE TO MAINTAIN COMPLEX WITH
THE POTENTIAL FOR EMBEDDED SUPERCELL AND/OR BOWING STRUCTURES
CAPABLE OF HAIL AND DAMAGING WIND GUSTS.

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 24035.


...MEAD/THOMPSON

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