474
FZUS54 KLCH 172009
CWFLCH

Coastal Waters Forecast
National Weather Service Lake Charles LA
309 PM CDT Mon Aug 17 2026

Coastal waters from the Lower Atchafalaya River LA to High
Island TX out 60 nautical miles including Sabine and
Calcasieu Lakes and Vermilion and Cote Blanche Bays

Seas are provided as a range of the average height of the
highest one third of the waves, along with the occasional
height of the average highest ten percent of the waves.

GMZ400-180900-
309 PM CDT Mon Aug 17 2026

.Synopsis for Lower Atchafalaya River LA to High Island TX out
60 NM including Sabine and Calcasieu Lakes and Vermilion and Cote
Blanche Bays...

Surface high pressure over the northwest Gulf will keep winds
light out of the southwest through the forecast period, generally
no more than 5-12 kt, with seas around 1-2 ft. High pressure aloft
will keep rain chances near zero through much of the week. Some
isolated shower activity may return by this weekend, with greater
chances further east.

$$

GMZ430-180900-
Sabine Lake-
309 PM CDT Mon Aug 17 2026

.TONIGHT...Southwest winds 5 to 10 knots. Lake waters light chop.
.TUESDAY...Southwest winds 5 to 10 knots. Lake waters light chop.
.TUESDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters light
chop.
.WEDNESDAY...Southwest winds 5 to 10 knots. Lake waters light
chop.
.WEDNESDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters
light chop.
.THURSDAY...Southwest winds 5 to 10 knots. Lake waters light
chop.
.THURSDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters
light chop.
.FRIDAY...Southwest winds 5 to 10 knots. Lake waters light chop.
.FRIDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters light
chop.
.SATURDAY...Southwest winds 5 to 10 knots. Lake waters light
chop.
.SATURDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters
light chop.

$$

GMZ432-180900-
Calcasieu Lake-
309 PM CDT Mon Aug 17 2026

.TONIGHT...Southwest winds 5 to 10 knots. Lake waters light chop.
.TUESDAY...West winds 5 to 10 knots, becoming southwest in the
afternoon. Lake waters light chop.
.TUESDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters light
chop.
.WEDNESDAY...West winds 5 to 10 knots, becoming southwest 10 to
15 knots in the afternoon. Lake waters choppy.
.WEDNESDAY NIGHT...Southwest winds 10 to 15 knots, diminishing to
5 to 10 knots after midnight. Lake waters choppy.
.THURSDAY...Southwest winds 5 to 10 knots. Lake waters light
chop.
.THURSDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters
light chop.
.FRIDAY...Southwest winds 5 to 10 knots. Lake waters light chop.
.FRIDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters light
chop.
.SATURDAY...Southwest winds 5 to 10 knots. Lake waters light
chop.
.SATURDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters
light chop.

$$

GMZ435-180900-
Vermilion and West Cote Blanche Bays-
309 PM CDT Mon Aug 17 2026

.TONIGHT...Southwest winds 5 to 10 knots. Bay waters light chop.
.TUESDAY...West winds 5 to 10 knots, becoming southwest in the
afternoon. Bay waters light chop.
.TUESDAY NIGHT...Southwest winds around 10 knots. Bay waters
light chop.
.WEDNESDAY...West winds 5 to 10 knots, becoming southwest 10 to
15 knots in the afternoon. Bay waters choppy.
.WEDNESDAY NIGHT...Southwest winds 10 to 15 knots. Bay waters
choppy.
.THURSDAY...Southwest winds 5 to 10 knots. Bay waters light chop.
.THURSDAY NIGHT...Southwest winds 5 to 10 knots. Bay waters light
chop.
.FRIDAY...West winds 5 to 10 knots. Bay waters light chop.
.FRIDAY NIGHT...Southwest winds 5 to 10 knots. Bay waters light
chop.
.SATURDAY...West winds 5 to 10 knots. Bay waters light chop. A
chance of showers and thunderstorms in the afternoon.
.SATURDAY NIGHT...West winds 5 to 10 knots. Bay waters light
chop.

Winds and waves higher in and near thunderstorms.

$$

GMZ436-180900-
Atchafalaya and East Cote Blanche Bays-
309 PM CDT Mon Aug 17 2026

.TONIGHT...Southwest winds 5 to 10 knots. Bay waters light chop.
.TUESDAY...West winds 5 to 10 knots. Bay waters light chop.
.TUESDAY NIGHT...West winds 5 to 10 knots. Bay waters light chop.
.WEDNESDAY...West winds 5 to 10 knots. Bay waters light chop.
.WEDNESDAY NIGHT...Southwest winds 5 to 10 knots. Bay waters
light chop.
.THURSDAY...West winds 5 to 10 knots. Bay waters light chop.
.THURSDAY NIGHT...Southwest winds 5 to 10 knots. Bay waters light
chop.
.FRIDAY...West winds 5 to 10 knots. Bay waters light chop.
.FRIDAY NIGHT...Southwest winds 5 to 10 knots. Bay waters light
chop.
.SATURDAY...West winds 5 to 10 knots. Bay waters light chop. A
chance of showers and thunderstorms in the afternoon.
.SATURDAY NIGHT...West winds 5 to 10 knots. Bay waters light
chop. A slight chance of showers and thunderstorms after
midnight.

Winds and waves higher in and near thunderstorms.

$$

GMZ450-180900-
Coastal waters from Cameron LA to High Island TX out 20 NM-
309 PM CDT Mon Aug 17 2026

.TONIGHT...Southwest winds 10 to 15 knots. Seas around 2 feet.
Wave Detail: South 2 feet at 4 seconds.
.TUESDAY...West winds 5 to 10 knots, becoming southwest 10 to
15 knots in the afternoon. Seas around 2 feet. Wave Detail:
Southwest 2 feet at 4 seconds.
.TUESDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet. Wave Detail: Southwest 2 feet at 3 seconds.
.WEDNESDAY...Southwest winds 10 to 15 knots. Seas around 2 feet.
Wave Detail: Southwest 2 feet at 4 seconds.
.WEDNESDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet. Wave Detail: Southwest 2 feet at 4 seconds.
.THURSDAY...Southwest winds 10 to 15 knots. Seas around 2 feet.
Wave Detail: Southwest 2 feet at 4 seconds.
.THURSDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet.
.FRIDAY...Southwest winds 10 to 15 knots. Seas around 2 feet.
.FRIDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet.
.SATURDAY...Southwest winds 10 to 15 knots. Seas around 2 feet.
.SATURDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet.

$$

GMZ452-180900-
Coastal waters from Intracoastal City to Cameron LA out 20 NM-
309 PM CDT Mon Aug 17 2026

.TONIGHT...Southwest winds around 10 knots. Seas around 2 feet.
Wave Detail: South 2 feet at 4 seconds.
.TUESDAY...West winds 5 to 10 knots. Seas around 2 feet. Wave
Detail: Southwest 2 feet at 3 seconds.
.TUESDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet. Wave Detail: Southwest 2 feet at 3 seconds.
.WEDNESDAY...West winds 10 to 15 knots. Seas around 2 feet. Wave
Detail: Southwest 2 feet at 4 seconds.
.WEDNESDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet. Wave Detail: Southwest 2 feet at 4 seconds.
.THURSDAY...Southwest winds 10 to 15 knots. Seas around 2 feet.
Wave Detail: Southwest 2 feet at 4 seconds.
.THURSDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet.
.FRIDAY...West winds around 10 knots. Seas around 2 feet.
.FRIDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet.
.SATURDAY...West winds 10 to 15 knots. Seas around 2 feet. A
slight chance of showers and thunderstorms in the afternoon.
.SATURDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet.

Winds and seas higher in and near thunderstorms.

$$

GMZ455-180900-
Coastal waters from Lower Atchafalaya River to Intracoastal City
LA out 20 NM-
309 PM CDT Mon Aug 17 2026

.TONIGHT...Southwest winds 5 to 10 knots. Seas 1 foot or less.
Wave Detail: Southwest 1 foot at 2 seconds.
.TUESDAY...West winds 5 to 10 knots. Seas 1 foot or less. Wave
Detail: West 1 foot at 3 seconds.
.TUESDAY NIGHT...West winds 5 to 10 knots. Seas 1 foot or less.
Wave Detail: West 1 foot at 3 seconds.
.WEDNESDAY...West winds 5 to 10 knots. Seas 1 foot or less. Wave
Detail: West 1 foot at 3 seconds.
.WEDNESDAY NIGHT...Southwest winds 5 to 10 knots. Seas 1 foot or
less. Wave Detail: Southwest 1 foot at 3 seconds.
.THURSDAY...West winds 5 to 10 knots. Seas 1 foot or less. Wave
Detail: Southwest 1 foot at 3 seconds.
.THURSDAY NIGHT...Southwest winds 5 to 10 knots. Seas 1 foot or
less.
.FRIDAY...West winds 5 to 10 knots. Seas 1 foot or less.
.FRIDAY NIGHT...Southwest winds around 10 knots. Seas 1 foot or
less, then around 2 feet after midnight.
.SATURDAY...West winds 5 to 10 knots. Seas around 2 feet in the
morning, then 1 foot or less. A slight chance of showers and
thunderstorms.
.SATURDAY NIGHT...West winds 5 to 10 knots. Seas 1 foot or less.
A slight chance of showers and thunderstorms after midnight.

Winds and seas higher in and near thunderstorms.

$$

GMZ470-180900-
Coastal waters from Cameron LA to High Island TX from 20 to 60 NM-
309 PM CDT Mon Aug 17 2026

.TONIGHT...Southwest winds 5 to 10 knots. Seas around 2 feet.
Wave Detail: Southeast 1 foot at 6 seconds.
.TUESDAY...Southwest winds 5 to 10 knots. Seas around 2 feet in
the morning, then 1 foot or less. Wave Detail: Southwest 1 foot
at 4 seconds and southeast 1 foot at 8 seconds, becoming
southwest 1 foot at 4 seconds and southeast 1 foot at 9 seconds.
.TUESDAY NIGHT...Southwest winds 5 to 10 knots, increasing to
10 to 15 knots after midnight. Seas around 2 feet. Wave Detail:
Southwest 2 feet at 3 seconds and southeast 1 foot at 9 seconds.
.WEDNESDAY...Southwest winds 10 to 15 knots. Seas around 2 feet.
Wave Detail: Southwest 2 feet at 4 seconds and southeast 1 foot
at 7 seconds.
.WEDNESDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet. Wave Detail: Southwest 2 feet at 4 seconds.
.THURSDAY...Southwest winds 10 to 15 knots, diminishing to 5 to
10 knots in the afternoon. Seas around 2 feet. Wave Detail:
Southwest 2 feet at 4 seconds.
.THURSDAY NIGHT...South winds 5 to 10 knots, becoming southwest
10 to 15 knots after midnight. Seas around 2 feet.
.FRIDAY...Southwest winds 5 to 10 knots. Seas around 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 10 knots, increasing to
10 to 15 knots after midnight. Seas around 2 feet.
.SATURDAY...West winds 10 to 15 knots, becoming southwest 5 to
10 knots in the afternoon. Seas around 2 feet.
.SATURDAY NIGHT...Southwest winds around 10 knots. Seas around
2 feet.

$$

GMZ472-180900-
Coastal waters from Intracoastal City to Cameron LA from 20 to
60 NM-
309 PM CDT Mon Aug 17 2026

.TONIGHT...Southwest winds 5 to 10 knots. Seas 1 foot or less,
then around 2 feet after midnight. Wave Detail: Southeast 1 foot
at 6 seconds, becoming southwest 1 foot at 3 seconds and
southeast 1 foot at 8 seconds.
.TUESDAY...West winds 5 to 10 knots. Seas around 2 feet in the
morning, then 1 foot or less. Wave Detail: Southwest 1 foot at
3 seconds and southeast 1 foot at 8 seconds.
.TUESDAY NIGHT...Southwest winds 5 to 10 knots. Seas 1 foot or
less, then around 2 feet after midnight. Wave Detail: Southwest
1 foot at 3 seconds and southeast 1 foot at 8 seconds, becoming
southwest 2 feet at 3 seconds and southeast 1 foot at 8 seconds.
.WEDNESDAY...West winds 5 to 10 knots. Seas around 2 feet. Wave
Detail: Southwest 2 feet at 4 seconds and southeast 1 foot at
7 seconds.
.WEDNESDAY NIGHT...Southwest winds 5 to 10 knots. Seas around
2 feet. Wave Detail: Southwest 2 feet at 4 seconds.
.THURSDAY...Southwest winds 5 to 10 knots. Seas around 2 feet.
Wave Detail: Southwest 2 feet at 4 seconds and southeast 1 foot
at 8 seconds.
.THURSDAY NIGHT...Southwest winds 5 to 10 knots. Seas around
2 feet.
.FRIDAY...West winds 5 to 10 knots. Seas around 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 10 knots. Seas around
2 feet.
.SATURDAY...West winds 5 to 10 knots. Seas around 2 feet.
.SATURDAY NIGHT...Southwest winds around 10 knots. Seas around
2 feet.

$$

GMZ475-180900-
Coastal waters from Lower Atchafalaya River to Intracoastal City
LA from 20 to 60 NM-
309 PM CDT Mon Aug 17 2026

.TONIGHT...Southwest winds 5 to 10 knots. Seas 1 foot or less.
Wave Detail: South 1 foot at 4 seconds and southeast 1 foot at
8 seconds.
.TUESDAY...West winds 5 to 10 knots. Seas 1 foot or less. Wave
Detail: West 1 foot at 3 seconds and southeast 1 foot at
9 seconds.
.TUESDAY NIGHT...Southwest winds 5 to 10 knots. Seas 1 foot or
less, then around 2 feet after midnight. Wave Detail: West 1 foot
at 3 seconds and southeast 1 foot at 8 seconds.
.WEDNESDAY...West winds 5 to 10 knots. Seas around 2 feet. Wave
Detail: West 2 feet at 3 seconds and southeast 1 foot at
7 seconds.
.WEDNESDAY NIGHT...Southwest winds 5 to 10 knots. Seas 1 foot or
less, then around 2 feet after midnight. Wave Detail: West 1 foot
at 4 seconds, becoming southwest 1 foot at 4 seconds and
southeast 1 foot at 8 seconds.
.THURSDAY...West winds 5 to 10 knots. Seas around 2 feet in the
morning, then 1 foot or less. Wave Detail: Southwest 2 feet at
4 seconds and southeast 1 foot at 8 seconds, becoming southwest
1 foot at 4 seconds.
.THURSDAY NIGHT...Southwest winds 5 to 10 knots. Seas 1 foot or
less.
.FRIDAY...West winds 5 to 10 knots. Seas around 2 feet in the
morning, then 1 foot or less.
.FRIDAY NIGHT...Southwest winds 5 to 10 knots. Seas around
2 feet.
.SATURDAY...West winds 5 to 10 knots. Seas around 2 feet. A
slight chance of showers and thunderstorms.
.SATURDAY NIGHT...West winds 5 to 10 knots. Seas around 2 feet. A
slight chance of showers and thunderstorms after midnight.

Winds and seas higher in and near thunderstorms.

$$