576
FXUS64 KLCH 201742
AFDLCH
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
1242 PM CDT SUN SEP 20 2026
..NEW DISCUSSION, AVIATION, MARINE, FIRE WEATHER
KEY MESSAGES
- PRECIPITATION CHANCES WILL INCREASE BUT REMAIN ISOLATED THROUGH
EARLY WEEK AS MOISTURE INCREASES, BUT HIGH PRESSURE REMAINS
CENTERED NEARLY OVERHEAD.
- A WEAK "FRONTAL" BOUNDARY WILL BRING SOME DRIER AIR BACK INTO
THE REGION WEDNESDAY THROUGH LATE WEEK.
DISCUSSION
(THIS AFTERNOON THROUGH NEXT SATURDAY)
ISSUED AT 1242 PM CDT SUN SEP 20 2026
MOISTURE IS ON THE INCREASE ACROSS THE REGION TODAY AS HIGH
PRESSURE SLIDES TO THE EAST OF THE MISSISSIPPI VALLEY AND A WEAK
COLD FRONT DROPS INTO THE CENTRAL PLAINS. A FEW SHOWERS HAVE BEEN
NOTED OVER THE COASTAL WATERS THIS MORNING AND SOME OF THESE HAVE
MOVED INTO JEFFERSON COUNTY AND CAMERON PARISH. EVEN THOUGH
MOISTURE IS ON THE INCREASE, HIGH PRESSURE ALOFT OVER TX AND LA
WILL KEEP CONVECTION SUPPRESSED, OUTSIDE OF A FEW SHOWERS ALONG
THE AFTERNOON SEA BREEZE.
MOISTURE WILL CONTINUE TO INCREASE INTO MONDAY AND TUESDAY,
HOWEVER ONLY ISOLATED AFTERNOON STORMS WILL BE POSSIBLE AREAWIDE
BOTH DAYS AS THE RIDGE ALOFT REMAINS IN PLACE.
LATE TUESDAY INTO EARLY WEDNESDAY, A WEAK FRONTAL BOUNDARY WILL
MOVE THROUGH THE AREA AND INTO THE COASTAL WATERS. A DRIER AIRMASS
WILL AGAIN FILTER IN WITH DEWPOINTS FALLING BACK INTO THE UPPER
50S WELL INLAND TO AROUND 70 AT THE COAST. MUCH LIKE THE LAST WEAK
BOUNDARY, HIGH TEMPERATURES WILL REMAIN ABOVE CLIMO NORMS, BUT THE
DRIER AIRMASS WILL KEEP HEAT INDEX VALUES CLOSE TO THE ACTUAL
TEMP. MORNING LOWS WILL BE NEAR CLIMO NORMS FOR LATE SEPTEMBER.
DEWPOINTS WILL AGAIN INCREASE NEXT WEEKEND AS THE FLOW TURNS BACK
ONSHORE WITH ISOLATED SHOWERS POSSIBLE AGAIN BY SUNDAY.
AVIATION
(18Z TAFS)
ISSUED AT 1242 PM CDT SUN SEP 20 2026
ISOLATED MVFR CEILINGS WILL BE POSSIBLE FOR ANOTHER HOUR OR TWO AS
THE CU FIELD DEVELOPS, AND PATCHY THIN BR WILL BE POSSIBLE EARLY
MONDAY, HOWEVER MOSTLY VFR CONDITIONS WILL OCCUR. WINDS WILL BE
LIGHT AND GENERALLY SE TODAY AND BECOME VRB TONIGHT.
MARINE
ISSUED AT 1242 PM CDT SUN SEP 20 2026
A LIGHT ONSHORE FLOW WILL REMAIN THROUGH LATE TUESDAY. A WEAK COLD
FRONT WILL MOVE INTO THE COASTAL WATERS EARLY WEDNESDAY WITH A
LIGHT TO MODERATE NORTHEAST TO EAST FLOW REMAINING THROUGH THE
REST OF THE WEEK.
FIRE WEATHER
ISSUED AT 1242 PM CDT SUN SEP 20 2026
A MODERATELY MOIST AIRMASS WILL REMAIN IN PLACE THROUGH TUESDAY AS
THE FLOW REMAINS LIGHT AND SOUTHERLY, HOWEVER A WEAK COLD FRONT
WILL PUSH THROUGH THE AREA TUESDAY NIGHT OR EARLY WEDNESDAY. MINIMUM
RELATIVE HUMIDITIES MAY FALL INTO THE UPPER 20S TO MID 30S ACROSS
INTERIOR AREAS BY THURSDAY.
LCH WATCHES/WARNINGS/ADVISORIES
LA...NONE.
TX...NONE.
GM...NONE.
PUBLIC/FIRE/MARINE...05
AVIATION...05
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