
NWS LCH discussion:
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
656 AM CDT MON APR 4 2011
.AVIATION UPDATE...REGARDING 12Z TAF ISSUANCE. A STRONG COLD
FRONT WITH THUNDERSTORMS WILL ADVANCE RAPIDLY ACROSS THE REGION
LATE THIS MORNING AND AFTERNOON. FORECAST MODELS ARE INDICATING A
SEVERE WEATHER POTENTIAL WITH THIS CONVECTION INCLUDING HAIL AND
DAMAGING WINDS. STRONG GRADIENT WINDS FROM THE SOUTH WILL MAINTAIN
MVFR CLOUDINESS ALONG AND AHEAD OF THE FRONT...WITH EQUALLY
STRONG OR SLIGHTLY STRONGER NORTHERLY WINDS BRIEFLY FOLLOWING THE
FRONTAL PASSAGE. SKIES WILL CLEAR A FEW HOURS AFTER THE FRONT
PASSES...WITH WINDS GRADUALLY DIMINISHING.
&&
MARCOTTE
&&
.PREV DISCUSSION... /ISSUED 540 AM CDT MON APR 4 2011/
DISCUSSION...
STRONG SOUTHERLY WINDS OVER THE COASTAL WATERS THIS MORNING
WITH RADAR INDICATING SHOWERS DEVELOPING IN THE COASTAL WATERS
WEST OF CALCASIEU PASS OUT BEYOND 60 NM. THESE STORMS ARE MOVING
TO THE NORTHEAST AND THIS TREND WILL CONTINUE THROUGH THE DAY
TODAY.
A STRONG COLD FRONT THAT IS CURRENT LOCATED OVER NORTH TEXAS THIS
AM WILL DIVE TO THE COAST OF SOUTHEAST TEXAS DURING THE EARLY
AFTERNOON AND THROUGH SOUTH CENTRAL LOUISIANA BY THE LATE
AFTERNOON HOURS. TEMPERATURES AHEAD OF THE FRONT ARE IN THE MID
70S. BEHIND THE FRONT TEMPS DROP QUICKLY INTO MID 50S WITH 40S
OVER OKLAHOMA.
THIS LATEST FRONT WILL BRING SHOWERS AND THUNDERSTORMS TO THE
REGION. UPPER LEVEL SUPPORT WILL ENHANCE STORM DEVELOPMENT WITH
SOME STORMS BECOMING SEVERE. THE MAIN THREAT IS WITH WINDS AND
LARGE HAIL...ALTHOUGH AN ISOLATED TORNADO CAN NOT BE RULED OUT. THE
PRESSURE GRADIENT IS VERY TIGHT BUT WILL SLACKEN A BIT DURING THE
LATE MORNING HOURS AS THE FRONT APPROACHES. BEHIND THE FRONT WINDS
WILL SWING AROUND TO THE NORTHWEST AND INCREASE TO AROUND 20 MPH
AND GUSTY. THE THREAT OF STORMS WILL END AROUND AN HOUR OR SO
BEHIND THE FRONT. TEMPERATURES WILL ALSO DROP THROUGH THE LATE
AFTERNOON AND INTO THE EVENING HOURS WITH THE FRONTAL PASSAGE.
MEAN AREA RAINFALL TOTALS WILL AVERAGE ABOUT AN INCH WITH TWO TO
THREE INCHES POSSIBLE WITH STRONGER STORMS.
THIS EVENING SHOWERS WILL BE DRAWING TO A CLOSE OVER SOUTH-CENTRAL
LOUISIANA. SKIES WILL GRADUALLY CLEAR THROUGH THE OVERNIGHT HOURS
WITH WINDS CONTINUING TO TAPER OFF. IN THE COASTAL WATERS WINDS
WILL REMAIN UP AND A GALE WARNING HAS BEEN POSTED THROUGH MIDNIGHT
FOR THE NEARSHORE WATERS AND THROUGH SUNRISE FOR THE OFFSHORE WATERS.
MUCH COOLER AND DRIER WITH NORTHERLY WINDS BECOMING EASTERLY LATE
IN THE DAY. AFTERNOON RELATIVE HUMIDITY WILL RANGE AROUND 15 TO 25
PERCENT. ON SUNNY SKIES TEMPS WILL RISE TO AROUND 70 OR SO.
ANOTHER COOL NIGHT IN STORE TUESDAY INTO WEDNESDAY. WEDNESDAY WILL
SEE TEMPERATURES REBOUNDING AS THE HIGH PRESSURE DOME MOVES OFF TO
THE EAST AND INTO THE CAROLINA COASTAL WATERS WITH SOUTHERLY WINDS
BECOMING ESTABLISHED ACROSS THE NORTHWEST GULF.
&&
.PRELIMINARY POINT TEMPS/POPS...
KLCH 78 45 71 49 78 / 80 10 0 0 0
KBPT 77 45 72 51 77 / 90 10 0 0 0
KAEX 78 41 70 44 78 / 90 10 0 0 0
KLFT 83 45 70 46 77 / 90 30 0 0 0
&&
.LCH WATCHES/WARNINGS/ADVISORIES...
LA...WIND ADVISORY UNTIL 8 PM CDT THIS EVENING FOR THE FOLLOWING
ZONES: ACADIA...ALLEN...AVOYELLES...BEAUREGARD...
CALCASIEU...CAMERON...EVANGELINE...IBERIA...JEFFERSON
DAVIS...LAFAYETTE...LOWER ST. MARTIN...RAPIDES...ST.
LANDRY...ST. MARY...UPPER ST. MARTIN...VERMILION...VERNON.
TX...WIND ADVISORY UNTIL 8 PM CDT THIS EVENING FOR THE FOLLOWING
ZONES: HARDIN...JASPER...JEFFERSON...NEWTON...ORANGE...
TYLER.
GM...GALE WATCH FROM THIS EVENING THROUGH TUESDAY MORNING FOR THE
FOLLOWING ZONES: 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.
SMALL CRAFT ADVISORY UNTIL 7 PM CDT THIS EVENING 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.
SMALL CRAFT EXERCISE CAUTION THROUGH LATE TONIGHT FOR THE
FOLLOWING ZONES: CALCASIEU LAKE...SABINE LAKE...VERMILION
BAY.
GALE WATCH FROM THIS EVENING THROUGH LATE TONIGHT 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.