770
FZUS54 KLCH 202009
CWFLCH

Coastal Waters Forecast
National Weather Service Lake Charles LA
309 PM CDT Thu Aug 20 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.

GMZ400-210900-
309 PM CDT Thu Aug 20 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...

High pressure continues to dominate our weather pattern. Winds
will remain light and mainly onshore with winds speeds between 5
and 15 knots. Waves will remain below 3 feet for the next several
days.

$$

GMZ430-210900-
Sabine Lake-
309 PM CDT Thu Aug 20 2026

.TONIGHT...Southwest winds 5 to 10 knots, becoming west late.
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...West winds around 5 knots. Lake waters smooth.
.SATURDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters
light chop.
.SUNDAY...Southwest winds 5 to 10 knots. Lake waters light chop.
.SUNDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters light
chop.
.MONDAY...Southwest winds 5 to 10 knots. Lake waters light chop.
.MONDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters light
chop.
.TUESDAY...Southwest winds 5 to 10 knots. Lake waters light chop.
A slight chance of showers and thunderstorms in the afternoon.
.TUESDAY NIGHT...South winds 5 to 10 knots. Lake waters light
chop.

Winds and waves higher in and near thunderstorms.

$$

GMZ432-210900-
Calcasieu Lake-
309 PM CDT Thu Aug 20 2026

.TONIGHT...Southwest winds 10 to 15 knots, becoming west 5 to
10 knots after midnight. Lake waters choppy.
.FRIDAY...West winds 5 to 10 knots, becoming southwest in the
afternoon. Lake waters light chop.
.FRIDAY NIGHT...Southwest winds 10 to 15 knots with gusts up to
20 knots, becoming west 5 to 10 knots after midnight. Lake waters
choppy.
.SATURDAY...West winds 5 to 10 knots. Lake waters light chop.
.SATURDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters
light chop.
.SUNDAY...Southwest winds 5 to 10 knots. Lake waters light chop.
.SUNDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters light
chop.
.MONDAY...Southwest winds 5 to 10 knots. Lake waters light chop.
.MONDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters light
chop.
.TUESDAY...Southwest winds 5 to 10 knots. Lake waters light chop.
A slight chance of showers and thunderstorms in the afternoon.
.TUESDAY NIGHT...Southwest winds 5 to 10 knots. Lake waters light
chop.

Winds and waves higher in and near thunderstorms.

$$

GMZ435-210900-
Vermilion and West Cote Blanche Bays-
309 PM CDT Thu Aug 20 2026

.TONIGHT...Southwest winds 10 to 15 knots. Bay waters choppy.
.FRIDAY...West winds 5 to 10 knots, becoming southwest in the
afternoon. Bay waters light chop.
.FRIDAY NIGHT...West winds 10 to 15 knots. Bay waters choppy. A
slight chance of showers and thunderstorms in the evening.
.SATURDAY...West winds 5 to 10 knots. Bay waters light chop. A
slight chance of showers and thunderstorms in the afternoon.
.SATURDAY NIGHT...West winds 5 to 10 knots. Bay waters light
chop.
.SUNDAY...Northwest winds around 5 knots, becoming southwest in
the afternoon. Bay waters light chop.
.SUNDAY NIGHT...Southwest winds 5 to 10 knots. Bay waters light
chop. A slight chance of showers and thunderstorms after
midnight.
.MONDAY...Southwest winds 5 to 10 knots. Bay waters light chop. A
slight chance of showers and thunderstorms.
.MONDAY NIGHT...Southwest winds 5 to 10 knots. Bay waters light
chop. A slight chance of showers and thunderstorms after
midnight.
.TUESDAY...Southwest winds 5 to 10 knots. Bay waters light chop.
A slight chance of showers and thunderstorms in the morning, then
a chance of showers and thunderstorms in the afternoon.
.TUESDAY NIGHT...Southwest winds 5 to 10 knots. Bay waters light
chop. A slight chance of showers and thunderstorms.

Winds and waves higher in and near thunderstorms.

$$

GMZ436-210900-
Atchafalaya and East Cote Blanche Bays-
309 PM CDT Thu Aug 20 2026

.TONIGHT...West winds 5 to 10 knots. Bay waters light chop.
.FRIDAY...West winds 5 to 10 knots. Bay waters light chop.
.FRIDAY NIGHT...West winds 5 to 10 knots. Bay waters light chop.
A slight chance of showers and thunderstorms in the evening.
.SATURDAY...West winds 5 to 10 knots. Bay waters light chop. A
slight chance of showers and thunderstorms in the afternoon.
.SATURDAY NIGHT...West winds 5 to 10 knots. Bay waters light
chop.
.SUNDAY...West winds 5 to 10 knots. Bay waters light chop.
.SUNDAY NIGHT...Southwest winds 5 to 10 knots. Bay waters light
chop. A slight chance of showers and thunderstorms.
.MONDAY...West winds around 5 knots. Bay waters smooth. A slight
chance of showers and thunderstorms.
.MONDAY NIGHT...Southwest winds 5 to 10 knots. Bay waters light
chop. A slight chance of showers and thunderstorms after
midnight.
.TUESDAY...Southwest winds around 5 knots. Bay waters smooth. A
slight chance of showers and thunderstorms in the morning, then a
chance of showers and thunderstorms in the afternoon.
.TUESDAY NIGHT...Southwest winds around 5 knots. Bay waters
smooth. A slight chance of showers and thunderstorms after
midnight.

Winds and waves higher in and near thunderstorms.

$$

GMZ450-210900-
Coastal waters from Cameron LA to High Island TX out 20 NM-
309 PM CDT Thu Aug 20 2026

.TONIGHT...Southwest winds 10 to 15 knots. Seas around 2 feet.
Wave Detail: Southwest 2 feet at 4 seconds.
.FRIDAY...Southwest winds 10 to 15 knots. Seas around 2 feet.
Wave Detail: Southwest 2 feet at 4 seconds.
.FRIDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet. Wave Detail: Southwest 2 feet at 4 seconds.
.SATURDAY...West winds 10 to 15 knots. Seas around 2 feet. Wave
Detail: Southwest 2 feet at 4 seconds.
.SATURDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet. Wave Detail: Southwest 2 feet at 4 seconds.
.SUNDAY...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.
.SUNDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet.
.MONDAY...Southwest winds 10 to 15 knots, diminishing to 5 to
10 knots in the afternoon. Seas around 2 feet in the morning,
then 1 foot or less.
.MONDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet.
.TUESDAY...Southwest winds 10 to 15 knots, diminishing to 5 to
10 knots in the afternoon. Seas around 2 feet.
.TUESDAY NIGHT...South winds 10 to 15 knots. Seas around 2 feet.

$$

GMZ452-210900-
Coastal waters from Intracoastal City to Cameron LA out 20 NM-
309 PM CDT Thu Aug 20 2026

.TONIGHT...Southwest winds 10 to 15 knots. Seas around 2 feet.
Wave Detail: Southwest 2 feet at 4 seconds.
.FRIDAY...West winds 10 to 15 knots. Seas around 2 feet. Wave
Detail: West 2 feet at 4 seconds.
.FRIDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet. Wave Detail: Southwest 2 feet at 4 seconds.
.SATURDAY...West winds 10 to 15 knots. Seas around 2 feet. Wave
Detail: West 2 feet at 4 seconds.
.SATURDAY NIGHT...West winds 10 to 15 knots. Seas around 2 feet.
Wave Detail: Southwest 2 feet at 4 seconds.
.SUNDAY...West winds 5 to 10 knots, increasing to 10 to 15 knots
in the afternoon. Seas around 2 feet. Wave Detail: West 2 feet at
4 seconds.
.SUNDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet.
.MONDAY...Southwest winds 5 to 10 knots. Seas around 2 feet in
the morning, then 1 foot or less. A slight chance of showers and
thunderstorms in the afternoon.
.MONDAY NIGHT...Southwest winds around 10 knots. Seas around
2 feet. A slight chance of showers and thunderstorms after
midnight.
.TUESDAY...Southwest winds 5 to 10 knots. Seas around 2 feet in
the morning, then 1 foot or less. A slight chance of showers and
thunderstorms.
.TUESDAY NIGHT...Southwest winds around 10 knots. Seas around
2 feet. A slight chance of showers and thunderstorms after
midnight.

Winds and seas higher in and near thunderstorms.

$$

GMZ455-210900-
Coastal waters from Lower Atchafalaya River to Intracoastal City
LA out 20 NM-
309 PM CDT Thu Aug 20 2026

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

Winds and seas higher in and near thunderstorms.

$$

GMZ470-210900-
Coastal waters from Cameron LA to High Island TX from 20 to 60 NM-
309 PM CDT Thu Aug 20 2026

.TONIGHT...Southwest winds 10 to 15 knots. Seas around 2 feet.
Wave Detail: Southwest 2 feet at 4 seconds.
.FRIDAY...West winds around 10 knots. Seas around 2 feet. Wave
Detail: Southwest 2 feet at 4 seconds.
.FRIDAY NIGHT...Southwest winds 10 to 15 knots. Seas around
2 feet. Wave Detail: Southwest 2 feet at 4 seconds.
.SATURDAY...West 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.
.SATURDAY NIGHT...Southwest winds around 10 knots. Seas around
2 feet. Wave Detail: South 2 feet at 5 seconds.
.SUNDAY...West winds 5 to 10 knots. Seas around 2 feet. Wave
Detail: Southwest 2 feet at 5 seconds.
.SUNDAY NIGHT...Southwest winds around 10 knots. Seas around
2 feet.
.MONDAY...Southwest winds 5 to 10 knots. Seas around 2 feet in
the morning, then 1 foot or less.
.MONDAY NIGHT...South winds 5 to 10 knots. Seas around 2 feet.
.TUESDAY...Southwest winds 5 to 10 knots. Seas around 2 feet in
the morning, then 1 foot or less.
.TUESDAY NIGHT...South winds 5 to 10 knots. Seas around 2 feet.

$$

GMZ472-210900-
Coastal waters from Intracoastal City to Cameron LA from 20 to
60 NM-
309 PM CDT Thu Aug 20 2026

.TONIGHT...Southwest winds 5 to 10 knots. Seas around 2 feet.
Wave Detail: Southwest 2 feet at 4 seconds.
.FRIDAY...West winds around 10 knots. Seas around 2 feet. Wave
Detail: Southwest 2 feet at 4 seconds.
.FRIDAY NIGHT...West winds 10 to 15 knots. Seas around 2 feet.
Wave Detail: Southwest 2 feet at 4 seconds.
.SATURDAY...West winds 10 to 15 knots. Seas around 2 feet. Wave
Detail: West 2 feet at 4 seconds.
.SATURDAY NIGHT...West winds around 10 knots. Seas around 2 feet.
Wave Detail: Southwest 2 feet at 5 seconds.
.SUNDAY...West winds 5 to 10 knots. Seas around 2 feet in the
morning, then 1 foot or less. Wave Detail: Southwest 2 feet at
5 seconds, becoming southwest 1 foot at 5 seconds.
.SUNDAY NIGHT...Southwest winds around 10 knots. Seas around
2 feet.
.MONDAY...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 in the morning.
.MONDAY NIGHT...Southwest winds 5 to 10 knots. Seas 1 foot or
less, then around 2 feet after midnight.
.TUESDAY...Southwest winds 5 to 10 knots. Seas around 2 feet in
the morning, then 1 foot or less. A slight chance of showers and
thunderstorms.
.TUESDAY NIGHT...South winds 5 to 10 knots. Seas around 2 feet.

Winds and seas higher in and near thunderstorms.

$$

GMZ475-210900-
Coastal waters from Lower Atchafalaya River to Intracoastal City
LA from 20 to 60 NM-
309 PM CDT Thu Aug 20 2026

.TONIGHT...Southwest winds 5 to 10 knots. Seas 1 foot or less.
Wave Detail: Southwest 1 foot at 4 seconds.
.FRIDAY...West winds 5 to 10 knots. Seas around 2 feet. Wave
Detail: West 1 foot at 3 seconds.
.FRIDAY NIGHT...West winds around 10 knots. Seas around 2 feet.
Wave Detail: West 2 feet at 4 seconds.
.SATURDAY...West winds around 10 knots. Seas around 2 feet. Wave
Detail: West 2 feet at 4 seconds. A chance of showers and
thunderstorms, mainly in the morning.
.SATURDAY NIGHT...West winds around 10 knots. Seas around 2 feet.
Wave Detail: West 2 feet at 4 seconds.
.SUNDAY...West winds 5 to 10 knots. Seas around 2 feet in the
morning, then 1 foot or less. Wave Detail: West 2 feet at
4 seconds, becoming west 1 foot at 4 seconds. A slight chance of
showers and thunderstorms in the morning.
.SUNDAY NIGHT...West winds 5 to 10 knots. Seas 1 foot or less. A
slight chance of showers and thunderstorms.
.MONDAY...West winds 5 to 10 knots. Seas 1 foot or less. A slight
chance of showers and thunderstorms.
.MONDAY NIGHT...Southwest winds 5 to 10 knots. Seas 1 foot or
less.
.TUESDAY...Southwest winds 5 to 10 knots, diminishing to around
5 knots in the afternoon. Seas 1 foot or less. A slight chance of
showers and thunderstorms.
.TUESDAY NIGHT...South 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.

$$