

000 

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

