WATCHES: Tornado Watch Number 78

WWUS20 KWNS 271802
SEL8
SPC WW 271802
ARZ000-OKZ000-TXZ000-280100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 78
NWS STORM PREDICTION CENTER NORMAN OK
100 PM CDT FRI MAR 27 2009

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

EXTREME SOUTHWEST ARKANSAS
EXTREME SOUTHEAST OKLAHOMA
NORTHEAST TEXAS

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 100 PM UNTIL 800
PM CDT.

TORNADOES...HAIL TO 2 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 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH OF PARIS TEXAS
TO 20 MILES WEST SOUTHWEST OF LUFKIN TEXAS. 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 76...WW 77...

DISCUSSION...THUNDERSTORMS ARE DEVELOPING IN A BROKEN BAND E OF THE
SURFACE COLD FRONT AND IN ASSOCIATION WITH A BELT OF ASCENT
ALOFT...GENERALLY E OF I-45. CLOUDS...A THUNDERSTORM CLUSTER
FARTHER S IN SE TX...AND WEAK LOW-LEVEL FLOW HAVE ALL MUDDLED THE
ENVIRONMENT ACROSS NE TX...WITH PROFILES NOT PARTICULARLY FAVORABLE
FOR SUPERCELLS AT THE MOMENT. HOWEVER...AS THE MID LEVEL AND
SURFACE CYCLONES MOVE EWD ACROSS N TX...LOW-LEVEL SHEAR SHOULD
GRADUALLY INCREASE OVER NE TX AND THE LOW LEVELS SHOULD DESTABILIZE
WITHIN SOME CLOUD BREAKS. BY LATER THIS AFTERNOON...THERE WILL BE
AN INCREASE IN THE THREAT FOR SUPERCELLS WITH A COUPLE OF
TORNADOES...IN ADDITION TO THE LARGE HAIL/DAMAGING WIND THREAT.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 23030.

...THOMPSON

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