Severe Local Storm Watch and Watch Cancellation 18:39:45.6868

THE UNIVERSITY OF TEXAS AT TYLER
University Operations Center (UOC)

This is an automatically generated special information alert from the UT Tyler Office of Emergency Management:

WWUS20 KWNS 272342
SEL2
SPC WW 272342
ARZ000-LAZ000-TXZ000-280700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 82
NWS STORM PREDICTION CENTER NORMAN OK
635 PM CDT FRI MAR 27 2009

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

SOUTHERN ARKANSAS
NORTHWEST LOUISIANA
NORTHEAST TEXAS

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 635 PM
UNTIL 200 AM CDT.

TORNADOES...HAIL TO 2.5 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 95 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES WEST NORTHWEST OF
LITTLE ROCK ARKANSAS TO 50 MILES WEST SOUTHWEST OF NATCHITOCHES
LOUISIANA. 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 78...WW 79...WW 80...WW
81...

DISCUSSION...POWERFUL UPPER TROUGH AND ASSOCIATED 70-80 MID LEVEL
JET STREAK WILL CONTINUE TO SPREAD EAST ACROSS TX/OK AREAS THROUGH
TONIGHT AND LEND SUPPORT TO DEEP SURFACE CYCLOGENESIS FROM THE
ARKLATEX TO THE MS RIVER. AIR MASS AHEAD OF THIS PRONOUNCED SUPPORT
FOR STRONG UPWARD MOTION WAS MOIST AND SUFFICIENTLY UNSTABLE TO
SUPPORT ROBUST TSTM UPDRAFTS IN A REGIME CHARACTERIZED BY
STRENGTHENING DEEP-LAYER SHEAR AND INTENSE MESOSCALE FORCING NEAR
THE DEVELOPING LOW AND EWD ALONG WARM FRONT ACROSS SRN AR. CELLS
SHOULD CONTINUE TO GAIN STRENGTH NEAR THESE FEATURES...AS WELL AS
ALONG SURGING COLD FRONT NOW MOVING INTO ERN TX AND SERN OK. SHEAR
AND FORCING WILL BE MORE THAN ADEQUATE FOR UPDRAFT ROTATION AND
LONG-LIVED MESOCYCLONES. STORMS NEAR/EAST THE LOW CENTER...AND
TRACKING ALONG THE FRONT ACROSS AR WILL EXPERIENCE GREATEST LOW
LEVEL SHEAR AND HAVE THE POTENTIAL TO PRODUCE TORNADOES IN ADDITION
TO VERY LARGE HAIL. LINEAR FORCING WITH THE COLD FRONT MAY PROMOTE
EVENTUAL SQUALL LINE DEVELOPMENT WITH INCREASE IN WIDESPREAD WIND
THREAT POSSIBLY DEVELOPING LATER TONIGHT.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24030.

...CARBIN

P. Low/UOC
END OF ALERT