

000 

WWUS20 KWNS 101843

SEL5

SPC WW 101843

OKZ000-TXZ000-110200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 295

NWS STORM PREDICTION CENTER NORMAN OK

140 PM CDT SAT MAY 10 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST OKLAHOMA

       NORTHEAST TEXAS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 140 PM UNTIL

900 PM CDT.



TORNADOES...HAIL TO 3 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 85 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 5 MILES WEST SOUTHWEST OF

ARDMORE OKLAHOMA TO 65 MILES EAST NORTHEAST OF PARIS TEXAS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 292...WW 293...WW 294...



DISCUSSION...DESTABILIZATION AND LIFT ALONG ADVANCING DRYLINE

THROUGH LATE THIS AFTERNOON SHOULD SPUR ISOLD TO SCTD SUPERCELL

DEVELOPMENT ACROSS PARTS OF SERN OK...THE RED RIVER VALLEY...AND

NERN TX. LOW LEVEL SHEAR AND POTENT INSTABILITY ACROSS THE AREA WILL

BE SUPPORTIVE OF LONG-LIVED MESOCYCLONES IN ANY DISCRETE

STORMS/UPDRAFTS THAT DEVELOP. TORNADO THREAT WITH THIS ACTIVITY

SHOULD INCREASE WITH TIME INTO THE EARLY EVENING. IN ADDITION TO

VERY LARGE/DAMAGING HAIL...A STRONG TORNADO CANNOT BE RULED OUT

GIVEN ANTECEDENT CONDITIONS AND MAGNITUDE OF FORCING/SHEAR FORECAST

TO DEVELOP ACROSS THE WATCH AREA.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 27030.





...CARBIN

