WATCHES: Tornado Watch Number 137

WWUS20 KWNS 241143
SEL7
SPC WW 241143
LAZ000-MSZ000-CWZ000-241800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 137
NWS STORM PREDICTION CENTER NORMAN OK
640 AM CDT WED APR 24 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF
SOUTHERN AND EASTERN LOUISIANA
SOUTHERN MISSISSIPPI
COASTAL WATERS

* EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 640 AM
UNTIL 100 PM CDT.

* PRIMARY THREATS INCLUDE...
SEVERAL TORNADOES POSSIBLE
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
A FEW LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES WEST NORTHWEST OF MC
COMB MISSISSIPPI TO 40 MILES WEST OF HOUMA LOUISIANA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU7).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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...AN AREA OF TSTMS ALONG SW LA COLD FRONT HAS
STRENGTHENED OVER THE PAST 2 HRS...LIKELY IN RESPONSE TO INCREASING
LARGE SCALE ASCENT/WAA DOWNSTREAM FROM APPROACHING SRN STREAM UPR
IMPULSE. AREA VWP DATA AND SFC OBSERVATIONS SHOW WIND/THERMODYNAMIC
SETUP SUFFICIENT FOR SUSTAINED STORMS/SUPERCELLS GIVEN LOW-LVL
UPLIFT TO OVERCOME CIN. WITH LOW-LVL FLOW FAIRLY CONFLUENT AND
INCREASINGLY MOIST...POTENTIAL WILL EXIST FOR ADDITIONAL
STRENGTHENING OF STORMS...AND POSSIBLY FOR ISOLD DEVELOPMENT AHEAD
OF EXISTING SQLN. LOCALLY DMGG WIND...MARGINALLY SVR HAIL...AND
POSSIBLY A TORNADO OR TWO MAY OCCUR BEFORE UPR IMPULSE SWEEPS E
BEYOND LOW-LVL MOIST AXIS LATER TODAY.

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


...CORFIDI

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