FXUS64 KLCH 051041
AFDLCH

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
441 AM CST SAT DEC 5 2009

.SYNOPSIS...

COOL HIGH PRESSURE...EXTENDING FROM SAN ANTONIO THROUGH MEMPHIS 
...WILL TRAVEL EASTWARD...REACHING A JACKSON-TO-NASHVILLE LINE BY 
SATURDAY EVENING...BEFORE DOMING ACROSS WESTERN VIRGINIA ON SUNDAY.

FURTHER-UP...PACIFIC WESTERLIES CONTINUE IMPINGING UPON THE SIERRA 
MADRE ORIENTAL RANGE...GENERATING SHORT-WAVE IMPULSES THAT TRAVEL 
ACROSS THE WESTERN GULF COAST STATES.

PRESSURES BEGIN FALLING ON THE SOUTHWEST PERIPHERY OF THE VIRGINIA 
ANTICYCLONE...INDUCED BY WESTERLY IMPULSES PASSING OVERHEAD. A
CONSEQUENT COASTAL TROUGH (OR BACKDOOR WARMFRONT) WILL SET-UP...
EXTENDING FROM BROWNSVILLE TO BEAUMONT.

&&

.DISCUSSION...

FOR TODAY...DRY AND COLD SINKING AIR WILL MAINTAIN CLEAR SKIES
ACROSS THE AREA. THE TEMPERATURES WILL BE ON THE CHILLY SIDE
...DUE TO A COLD START. IN ADDITION...EVAPORATIONAL COOLING
(STANDING WATER FROM PREVIOUS SNOWFALL) WILL PARTIALLY OFFSET THE
RADIATIONAL WARM-UP. THE AFTERNOON TEMPERATURES WILL BE RUNNING
ABOUT 15 DEGREES BELOW NORMAL.

FOR TONIGHT...A SLOW WARM-UP BEGINS AS A WEAK GULF RETURN FLOW
SETS-UP. 

FOR SUNDAY...THE RETURN FLOW STRENGTHENS INTO A WARM CONVEYOR BELT
AIRSTREAM. INCOMING CAMPECHE AIR WILL UPSLIDE COLD CONTINENTAL AIR
IN PLACE ACROSS THE FORECAST AREA. OVERRUNNING RAIN IS THE RESULT.

&&

.OUTLOOK...

COLD HIGH PRESSURE BUILDING OUT OF THE GREAT PLAINS WILL PUSH THE 
BACKDOOR WARMFRONT INTO THE NORTHWEST GULF OF MEXICO ON MONDAY
...THE INCLINED FRONTAL WEDGE NOW POINTING LIKE A COLD FRONT.
 
THE BERMUDA HIGH RE-BUILDING WESTWARD THROUGH THE GULF OF MEXICO
WILL PUSH THE PREVIOUS COLD FRONT WESTWARD...NOW AS A WARM FRONT.

FINALLY...ANOTHER GREAT PLAINS LOW...THIS TIME IN THE COLORADO
FRONT RANGE...WILL FORM ON TUESDAY...THEN TRAVEL EAST-NORTHEAST
...SHOVING THE PREVIOUS WARM FRONT BACK INTO THE NORTHWEST GULF
OF MEXICO AS A COLD FRONT...WHICH SUBSEQUENTLY LEAVES THE AREA.

&&

.PRELIMINARY POINT TEMPS/POPS...
KLCH  50  37  58  56  68 /   0   0  50  60   0 
KBPT  50  39  58  54  67 /   0   0  60  60   0 
KAEX  49  31  57  49  63 /   0   0  40  60   0 
KLFT  48  36  59  54  68 /   0   0  40  60  20 

&&

.LCH WATCHES/WARNINGS/ADVISORIES...
LA...HARD FREEZE WARNING UNTIL 8 AM CST THIS MORNING FOR THE 
     FOLLOWING ZONES: ALLEN...AVOYELLES...BEAUREGARD...
     EVANGELINE...RAPIDES...ST. LANDRY...VERNON.

     FREEZE WARNING UNTIL 8 AM CST THIS MORNING FOR THE FOLLOWING 
     ZONES: ACADIA...CALCASIEU...CAMERON...IBERIA...JEFFERSON 
     DAVIS...LAFAYETTE...LOWER ST. MARTIN...ST. MARY...UPPER ST. 
     MARTIN...VERMILION.

TX...HARD FREEZE WARNING UNTIL 8 AM CST THIS MORNING FOR THE 
     FOLLOWING ZONES: HARDIN...JASPER...NEWTON...TYLER.

     FREEZE WARNING UNTIL 8 AM CST THIS MORNING FOR THE FOLLOWING 
     ZONES: JEFFERSON...ORANGE.

GM...SMALL CRAFT ADVISORY UNTIL 9 AM CST THIS MORNING FOR THE 
     FOLLOWING ZONES: 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 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.

&&

TRARES

$$