Severe Thunderstorm Warning 141, NWS Lake Charles, LA

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
1130 AM CST TUE NOV 14 2006

.UPDATE...
ONLY UPDATE AT THIS TIME IS TO GO AHEAD AND GO WITH A SMALL CRAFT
ADVISORY FOR TONIGHT THROUGH THURSDAY MORNING.

ALSO...AS WARM FRONT MOVES INLAND SCATTERED SHOWERS AND A FEW
THUNDERSTORMS ARE DEVELOPING. STORMS HAVE SHOWN SOME WEAK ROTATION
AND WE HAVE REPORTS OF FUNNEL CLOUDS RIGHT ALONG THE WARM FRONT IN
THE VICINITY OF LAKE CHARLES. WE WILL ALSO DO A SPECIAL 18Z UPPER
AIR SOUNDING TO TAKE A MORE CURRENT SAMPLE OF THE ATMOSPHERE.

&&

RUA

&&

.PREV DISCUSSION... (ISSUED 401 AM CST TUE NOV 14 2006)

SYNOPSIS...SHOWERS ARE BEGINNING TO DEVELOP NEAR A MOISTURE AXIS
OVER SOUTHEAST TEXAS. THIS IS IN RESPONSE TO A SOUTHERLY RETURN
FLOW INITIATING IN THE WAKE OF A SURFACE HIGH PRESSURE RIDGE IN
THE TENNESSEE VALLEY WHICH WILL CONTINUE EASTWARD. SOUTHERLY WINDS
WILL INCREASE TODAY OVER THE AREA AS LOW PRESSURE DEVELOPS NEAR
THE PAN HANDLE. INCREASING MOISTURE WILL COMBINE WITH ANOTHER WEAK
UPPER LEVEL DISTURBANCE TO PRODUCE SCATTERED SHOWERS AND
THUNDERSTORMS OVER MOST OF THE AREA TODAY AND TONIGHT AHEAD OF A
PACIFIC COLD FRONT WITH MODIFIED POLAR AIR OUT OF THE NORTHERN
PLAINS. BEST CHANCE FOR RAIN WILL BE EAST OF THE SABINE RIVER
WHERE THE BEST MOISTURE WILL POOL.

A REINFORCING COLD SHOT WILL BLOW THROUGH ON SATURDAY. THIS NEXT
COLD FRONT LOOKS DRY AS UPPER LEVEL WINDS WILL BE NORTHWESTERLY
FROM A BROAD RIDGE OVER THE WESTERN STATES. DRY AND SEASONABLY
COOL CONDITIONS SHOULD HOLD INTO EARLY NEXT WEEK AS THIS BROAD
RIDGE MOVES THROUGH.

DISCUSSION...CHOSE TO LEAVE SEVERE WORDING OUT OF THE FORECAST
PACKAGE TONIGHT AND EARLY WEDNESDAY AS THE NAM LAGS THE STRONG H3
JETSTREAK TO THE WEST. BY THE TIME THE JET MAX BRINGS FAVORABLE
RIGHT REAR QUAD DYNAMICS (AGEOSTROPHIC LIFT) WEDNESDAY AFTERNOON,
THE MOISTURE HAS BEEN DRY PUNCHED OUT TO THE EAST OF THE LOWER
MISSISSIPPI VALLEY. CANNOT RULE OUT AN ISOLATED SEVERE GUST AS
THE DRY PUNCH MOVES INTO THE CONVECTION EARLY WEDNESDAY MORNING.
WENT LOWER ON POPS VS GUIDANCE DUE TO CAPPING AHEAD OF THE FRONT TNITE.

WENT A CAT HIGHER ON TEMPS FROM PREVIOUS PACKAGE WED AND WED NIGHT
MAINLY DUE TO STRONG SUBSIDENCE ON WEDNESDAY WITH THE BACK SIDE OF
THE TROF AND TURBULENT MIXING OF STRONG NORTHWESTERLY WINDS. THE
NAM HINTS AT WRAPAROUND STRATOCU CIGS WED NIGHT WITH THICKNESS
HEIGHT RISES AND COOL ADVECTION ENDING EARLY EVENING.

AVIATION...MVFR CIGS WITH SHOWERS ALL TERMINALS EARLY TODAY,
IMPROVING TO VFR CIGS DURING THE AFTERNOON EXCEPT TEMPO MVFR IN SHOWERS.
COULD BE A FEW IMBEDDED TSTMS AS THERE IS UPPER LEVEL DIVERGENCE
AND CONVECTIVE TEMPS IN THE MID 70S WILL BE REACHABLE.

MARINE...BUILDING SEAS SHOULD REACH SCA CRITERIA AROUND MIDNIGHT TONIGHT.
AN UPDATED COASTAL FORECAST TO INCLUDE THIS HAZARD TO NAVIGATION
COULD BE ISSUED AROUND NOON TODAY. WINDS WILL ALSO REACH SCA
CRITERIA A BIT LATER WITH THE FRONTAL PASSAGE WEDNESDAY MORNING.
SCA WINDS AND SEAS WILL LIKELY PERSIST THROUGH WEDNESDAY NIGHT.

&&

.LCH WATCHES/WARNINGS/ADVISORIES...
LA...NONE.
TX...NONE.
GM...SMALL CRAFT ADVISORY FROM MIDNIGHT WEDNESDAY TO NOON THURSDAY
     FOR THE FOLLOWING ZONES: COASTAL WATERS FROM CAMERON, LA TO
     HIGH ISLAND, TX OUT 20 NM...COASTAL WATERS FROM
     INTRACOASTAL CITY TO CAMERON, LA OUT 20 NM...COASTAL WATERS
     FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY, LA OUT
     20 NM...WATERS FROM CAMERON, LA TO HIGH ISLAND, TX
     EXTENDING FROM 20 NM TO 60 NM...WATERS FROM INTRACOASTAL
     CITY, LA TO CAMERON, LA EXTENDING FROM 20 NM TO 60 NM...AND
     WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY,
     LA EXTENDING FROM 20 NM TO 60 NM.

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAKE CHARLES LA
517 AM CST TUE NOV 14 2006

GMZ450-452-455-470-472-475-LAZ027>033-041>045-051>055-TXZ180>182-
201-215-216-151130-
COASTAL WATERS FROM CAMERON, LA TO HIGH ISLAND, TX OUT 20 NM-
COASTAL WATERS FROM INTRACOASTAL CITY TO CAMERON, LA OUT 20 NM-
COASTAL WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY,
LA OUT 20 NM-
WATERS FROM CAMERON, LA TO HIGH ISLAND, TX EXTENDING FROM 20 NM
TO 60 NM-
WATERS FROM INTRACOASTAL CITY, LA TO CAMERON, LA EXTENDING FROM
20 NM TO 60 NM-
WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY, LA
EXTENDING FROM 20 NM TO 60 NM-VERNON-RAPIDES-AVOYELLES-BEAUREGARD-
ALLEN-EVANGELINE-ST. LANDRY-CALCASIEU-JEFFERSON DAVIS-ACADIA-
LAFAYETTE-UPPER ST. MARTIN-CAMERON-VERMILION-IBERIA-ST. MARY-
LOWER ST. MARTIN-TYLER-JASPER-NEWTON-HARDIN-JEFFERSON-ORANGE-
517 AM CST TUE NOV 14 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF GM...CENTRAL
LOUISIANA...SOUTH CENTRAL LOUISIANA...SOUTHWEST LOUISIANA...WEST
CENTRAL LOUISIANA AND SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

THERE WILL BE A SLIGHT RISK FOR SEVERE THUNDERSTORMS AHEAD OF AN APPROACHING
COLD FRONT LATE TONIGHT. ALTHOUGH MOST OF THE SEVERE ACTIVITY
SHOULD BE NORTH OF THE AREA, STORMS COULD DEVELOP IN SQUALL LINES
AHEAD OF THE FRONT. A DRY PUNCH COULD PRODUCE SOME BOW TYPE STORMS
WITH STRONG STRAIGHT LINE WINDS.

DUE TO THE SHORT DURATION AND COVERAGE OF THESE STORMS, ACTIVATION
OF SPOTTERS IS NOT ANTICIPATED.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

THE COLD FRONT WILL MOVE THROUGH THE AREA DURING THE MORNING ON
WEDNESDAY, ENDING THE SLIGHT RISK OF SEVERE THUNDERSTORMS. MUCH
DRIER AIR AND STRONG WINDS WOULD INCREASE THE RISK OF WILDFIRE
WEDNESDAY AFTERNOON, HOWEVER THE SOILS REMAIN QUITE MOIST FROM LAST
MONTHS HEAVY RAINFALL.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF SPOTTERS WILL NOT BE NECESSARY.