PDS Tornado Watch #169

URGENT – IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 169
NWS STORM PREDICTION CENTER NORMAN OK
305 PM CDT MON APR 7 2008

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

LARGE PART OF SOUTHWEST AND CENTRAL OKLAHOMA
SMALL PART OF NORTHWEST TEXAS

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 305 PM UNTIL
1000 PM CDT.

…THIS IS A PARTICULARLY DANGEROUS SITUATION…

DESTRUCTIVE TORNADOES…LARGE HAIL TO 4 INCHES IN DIAMETER…
THUNDERSTORM WIND GUSTS TO 80 MPH…AND DANGEROUS LIGHTNING ARE
POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTH SOUTHEAST OF
WICHITA FALLS TEXAS TO 30 MILES NORTH NORTHWEST OF OKLAHOMA CITY
OKLAHOMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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.

DISCUSSION…A VERY POTENT SUPERCELL ENVIRONMENT IS DEVELOPING
ACROSS THE WATCH AREA THIS AFTERNOON. STRONG VEERING SHEAR PROFILES
COUPLED WITH AN INCREASINGLY UNSTABLE AIR MASS WILL SUPPORT
DEVELOPMENT OF SEVERE THUNDERSTORMS BOTH VICINITY E/W FRONTAL ZONE
CENTRAL OK AND ALONG AND E OF DRY LINE EXTENDING SWD INTO NWRN TX.
SUPERCELLS WILL RAPIDLY EVOLVE GIVEN SHEAR WITH ASSOCIATED VERY
LARGE HAIL AND TORNADO THREAT WITH ANY STORM. POTENTIAL EXITS FOR
LONG LIVED SUPERCELLS MOVING ACROSS WARM SECTOR WITH POSSIBLE STRONG
TORNADOES.

AVIATION…TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 4 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 25025.

…HALES