FXUS64 KLCH 152148
AFDLCH
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
348 PM CST TUE DEC 15 2009
.DISCUSSION...
COLD FRONT CONTINUES TO MOVE OUT THROUGH THE COASTAL WATERS THIS
AFTERNOON. LOW LEVEL CONVERGENCE CONTINUES TO WANE AS THE SURFACE
FRONT AND 85H FRONT SAG TO THE SOUTH...THEREFORE THE HEAVIER RAINS
CONTINUE TO TAPER OFF AND WILL GO AHEAD AND CANCEL WHAT REMAINED
OF THE FLASH FLOOD WATCH.
DESPITE FRONT MOVING THROUGH AND COOLER AND SOMEWHAT DRIER AIR
MOVING IN...DO NOT EXPECT TO SEE MUCH SUNSHINE ON WEDNESDAY...AS MID
AND HIGH LEVEL CLOUDS AGAIN PUSH ACROSS THE AREA.
OLD COLD FRONT WILL STALL OVER THE NORTH CENTRAL GULF OF MEXICO.
SOUTHERN BRANCH OF THE JET STREAM WILL AGAIN MOVE AN UPPER LEVEL
DISTURBANCE TOWARD THE REGION LATE WEDNESDAY. THIS WILL HELP
GENERATE A SURFACE WAVE OF LOW PRESSURE ALONG THE STALLED FRONT.
THIS SURFACE LOW WILL MOVE NORTHEASTWARD ALONG THE OLD FRONT ON
THURSDAY. EXPECT SURFACE LOW TO STAY OVER THE COASTAL WATERS...YET
OVER-RUNNING MOISTURE ASSOCIATED WITH THE LOW WILL HELP DEVELOP
RAINS LATE WEDNESDAY NIGHT OVER WESTERN ZONES...SPREADING ACROSS
THE ENTIRE FORECAST AREA ON THURSDAY...WITH RAINS TAPERING OFF
FROM WEST TO EAST ON THURSDAY NIGHT AS THE SURFACE LOW CONTINUES
TO MOVE OFF TO THE EAST. AT THIS POINT...HEAVIEST RAINFALL AMOUNTS
SHOULD BE CONFINED TO THE IMMEDIATE COAST AND OVER THE COASTAL
WATERS...ALTHOUGH WILL HAVE TO WATCH CLOSELY AS A MORE NORTHERN
TRACK OF THE LOW THAN PROGGED WILL BRING SOME HEAVY RAIN FURTHER INLAND.
FINALLY SOME DEEPER AND DRIER NORTHWEST FLOW LOOKS TO DEVELOP ON
FRIDAY INTO THE WEEKEND. THIS SHOULD ALLOW FOR SOME CLEARING
SKIES AND A CHANCE TO ACTUALLY SEE THE SUNSHINE THIS WEEKEND. WITH
THE DEEP NORTHWEST FLOW...TEMPERATURES ARE EXPECTED TO REMAIN
QUITE COOL AND BELOW NORMAL INTO EARLY NEXT WEEK.
RUA
&&
.MARINE...
WINDS ARE INCREASING OVER THE COASTAL WATERS THIS AFTERNOON AS
COLD FRONT DEPARTS THE AREA. WINDS AND SEAS WILL BE HIGH ENOUGH
FOR SMALL CRAFT ADVISORY CONDITIONS THROUGH EARLY WEDNESDAY.
WINDS MAY DECREASE SLIGHTLY ON WEDNESDAY AFTERNOON...BEFORE
GRADIENT TIGHTENS AS SURFACE LOW DEVELOPS OVER THE WESTERN GULF ON
WEDNESDAY NIGHT WITH SMALL CRAFT ADVISORY CONDITIONS CONTINUING
THROUGH THURSDAY.
RUA
&&
.PRELIMINARY POINT TEMPS/POPS...
KLCH 42 54 42 53 42 / 10 10 30 50 40
KBPT 41 54 43 53 40 / 10 10 30 50 30
KAEX 37 52 37 51 38 / 10 10 10 30 30
KLFT 42 54 41 55 43 / 20 10 20 50 50
&&
.LCH WATCHES/WARNINGS/ADVISORIES...
LA...NONE.
TX...NONE.
GM...SMALL CRAFT ADVISORY UNTIL NOON CST WEDNESDAY 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...WATERS FROM
LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY, LA EXTENDING
FROM 20 NM TO 60 NM.
&&
$$
