WATCHES: Severe Thunderstorm Watch Number 508

WWUS20 KWNS 102047
SEL8
SPC WW 102047
OKZ000-TXZ000-110300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 508
NWS STORM PREDICTION CENTER NORMAN OK
345 PM CDT TUE JUL 10 2007

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

SOUTHEAST OKLAHOMA
NORTH CENTRAL AND NORTHEAST TEXAS

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 345 PM UNTIL
1000 PM CDT.

HAIL TO 1.5 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 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTHWEST
OF ARDMORE OKLAHOMA TO 40 MILES EAST OF PARIS TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU8).

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 504...WW 505...WW
506...WW 507...

DISCUSSION...STRONG/SEVERE STORMS WILL LIKELY DEVELOP ALONG A
REMNANT OUTFLOW BOUNDARY JUST N OF THE RED RIVER...WITH STORMS FED
BY MID 70 DEWPOINTS AND STRONG INSTABILITY FROM THE SW. THIS AREA
IS ALONG THE SWRN FLANK OF A MID LEVEL VORTICITY CENTER OVER ERN
OK...WHERE MODEST NWLY MID LEVEL FLOW WILL RESULT IN SUFFICIENT
VERTICAL SHEAR FOR ORGANIZED MULTICELL CLUSTERS...AND PERHAPS
SUPERCELLS. A BRIEF/WEAK TORNADO CANNOT BE RULED OUT...BUT THE
PRIMARY SEVERE THREAT SHOULD BE DAMAGING DOWNBURST WINDS...ALONG
WITH LARGE HAIL WITH THE MOST INTENSE STORMS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM
MOTION VECTOR 30020.

..THOMPSON

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