Severe Local Storm Watch and Watch Cancellation 09:25:06.0974

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 121428
SEL4
SPC WW 121428
ARZ000-LAZ000-TXZ000-122100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 144
NWS STORM PREDICTION CENTER NORMAN OK
930 AM CDT SUN APR 12 2009

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

PARTS OF SOUTHERN ARKANSAS
LARGE PART OF NORTHERN LOUISIANA
PARTS OF NORTHEAST TEXAS

EFFECTIVE THIS SUNDAY MORNING AND AFTERNOON FROM 930 AM UNTIL 400
PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80
STATUTE MILES EITHER SIDE OF A LINE FROM 25 MILES SOUTH SOUTHWEST
OF LONGVIEW TEXAS TO 55 MILES SOUTHEAST OF EL DORADO ARKANSAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 142...WW 143...

DISCUSSION...LINE OF SEVERE THUNDERSTORMS DEVELOPING RAPIDLY NERN TX
IN RESPONSE TO STRONG ASCENT AHEAD OF MAIN UPPER TROUGH AND
CONTINUED INCREASE IN INSTABILITY ABOVE SHALLOW STABLE BOUNDARY
LAYER. STORMS EXPECTED TO CONTINUE E/NE ACROSS WATCH WITH PRIMARY
THREAT DAMAGING WINDS AND LARGE HAIL. DURING AFTERNOON BOUNDARY
LAYER WILL GRADUALLY BECOME MORE UNSTABLE OVER LA AND INCREASE
CONCERN FOR SUPERCELLS AND POSSIBLE TORNADOES.

AVIATION...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 500. MEAN STORM
MOTION VECTOR 24035.

...HALES

P. Low/UOC
END OF ALERT