WATCHES: Tornado Watch Number 669

WWUS20 KWNS 130623
SEL9
SPC WW 130623
LAZ000-TXZ000-CWZ000-131500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 669
NWS STORM PREDICTION CENTER NORMAN OK
120 AM CDT THU SEP 13 2007

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

SOUTHERN LOUISIANA
EXTREME SOUTHEAST TEXAS
COASTAL WATERS

EFFECTIVE THIS THURSDAY MORNING FROM 120 AM UNTIL 1000 AM CDT.

TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 30 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST OF PORT ARTHUR
TEXAS TO 25 MILES SOUTHEAST OF LAFAYETTE LOUISIANA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU9).

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.

DISCUSSION...POTENTIAL FOR ISOLATED TORNADOES WILL INCREASE THROUGH
ABOUT SUNRISE ALONG THE NWRN GULF CST FROM EXTREME SE TX INTO S
CNTRL LA AS CIRCULATION OF HRCN HUMBERTO MOVES INLAND. GREATEST
THREAT SHOULD EXIST AT INTERSECTION OF OUTER CONFLUENCE BAND WITH
SLOW NWD-MOVING W-E FRONT NOW ALONG THE IMMEDIATE LA CST. SRH FOR
CELLS MOVING NWD AT 20 KTS HAS INCREASED TO AOA 175 M2/S2 IN THE
PAST 2 HRS USING THE LCH VWP. VALUES SHOULD INCREASE TO AOA 250
M2/S2 BY 09-12Z ALONG THE CNTRL AND SW LA GULF CST...AS SFC
DEWPOINTS RISE INTO MID 70S.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 17035.

..CORFIDI

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