SEL7
SPC WW 181046
LAZ000-TXZ000-CWZ000-181500-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 27
NWS STORM PREDICTION CENTER NORMAN OK
450 AM CST SAT FEB 18 2012
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHWEST LOUISIANA
SOUTHEAST TEXAS
COASTAL WATERS
EFFECTIVE THIS SATURDAY MORNING FROM 450 AM UNTIL 900 AM CST.
HAIL TO 1.5 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 60
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTH OF PORT
ARTHUR TEXAS TO 25 MILES EAST SOUTHEAST OF PALACIOS TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU7).
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.
DISCUSSION...A LINE OF INTENSE THUNDERSTORMS HAS DEVELOPED
ALONG/AHEAD OF SURFACE COLD FRONT SURGING EASTWARD ACROSS SOUTHEAST
TX. THE SURFACE AIR MASS AHEAD OF THE STORMS IS ONLY MARGINALLY
UNSTABLE AT BEST. HOWEVER...INCREASING MESOSCALE ORGANIZATION OF
THE LINE SUGGESTS SOME POTENTIAL OF DAMAGING WIND GUSTS REACHING THE
SURFACE. OTHERWISE...HAIL WILL ALSO BE POSSIBLE IN THE STRONGER
CELLS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 25040.
...HART
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