WATCHES: Tornado Watch Number 212

WWUS20 KWNS 220157
SEL2
SPC WW 220157
OKZ000-220700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 212
NWS STORM PREDICTION CENTER NORMAN OK
900 PM CDT MON APR 21 2008

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

CENTRAL AND SOUTHERN OKLAHOMA

EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 900 PM UNTIL
200 AM CDT.

TORNADOES...HAIL TO 2.5 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 45 STATUTE
MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH OF CHANDLER
OKLAHOMA TO 10 MILES SOUTH OF ARDMORE OKLAHOMA. FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU2).

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 211...

DISCUSSION...ISOLATED TSTM IN SW OK THAT FORMED EARLIER THIS EVENING
ALONG MERGING PREFRONTAL BOUNDARIES APPEARS TO HAVE BECOME A
SUSTAINED SUPERCELL. GIVEN INCREASINGLY MOIST LOW-LEVEL
ENVIRONMENT... POTENTIAL FOR A SLIGHT NOCTURNAL INCREASE IN THE SLY
LLJ...AND GRAZING INFLUENCE OF ERN CO/WRN KS UPR TROUGH...THREAT
WILL EXIST FOR A TORNADO OR TWO IN ADDITION TO VERY LARGE HAIL AND
LOCALLY DMGG WIND.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 26020.

...CORFIDI

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