WATCHES: Tornado Watch Number 708

WWUS20 KWNS 171249
SEL8
SPC WW 171249
OKZ000-TXZ000-172100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 708
NWS STORM PREDICTION CENTER NORMAN OK
745 AM CDT WED OCT 17 2007

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

SOUTHWEST THROUGH CENTRAL AND NORTHEAST OKLAHOMA
WESTERN NORTH TEXAS

EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 745 AM UNTIL
400 PM CDT.

TORNADOES...HAIL TO 1.5 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 65 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 55 MILES SOUTHWEST OF ALTUS
OKLAHOMA TO 10 MILES SOUTHEAST OF TULSA OKLAHOMA. FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU8).

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 706...WW 707...

DISCUSSION...SLIGHTLY ELEVATED TSTMS/SUPERCELLS FORMING IN AREA OF
ASCENT AHEAD OF STRONG NM SHORTWAVE TROUGH EXPECTED TO PERSIST AND
POSSIBLY STRENGTHEN AS LOW LVL MOISTURE INFLOW CONTINUES ACROSS
REGION. WHILE SFC HEATING WILL BE LIMITED...COMBINATION OF WEAK MID
LVL COOLING...LOW LVL MOISTENING AND INCREASING LARGE SCALE ASCENT
MAY ALLOW STORMS TO BECOME INCREASINGLY SFC-BASED. STRENGTH OF LOW
LVL DIRECTIONAL SHEAR /EFFECTIVE SRH TO 300 MR PER S2/ AND LOW LCLS
SUGGEST POTENTIAL FOR TORNADOES IF STORMS DO INDEED STRENGTHEN AND
BECOME SFC-BASED.

AVIATION...TORNADOES AND 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
450. MEAN STORM MOTION VECTOR 23040.

..CORFIDI

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