509
FZUS54 KLCH 110511
CWFLCH

Coastal Waters Forecast
National Weather Service Lake Charles LA
1211 AM CDT Mon Aug 11 2025

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.

GMZ400-111800-
1211 AM CDT Mon Aug 11 2025

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

An unsettled weather pattern will lead to widespread showers and
thunderstorms across the coastal waters through mid-week. Winds
and waves will remain light, with winds less than 10 knots and
waves between 1 and 3 feet. Near thunderstorms, winds and waves
will be higher.

$$

GMZ430-111800-
Sabine Lake-
1211 AM CDT Mon Aug 11 2025

.TODAY...Northeast winds around 5 knots, becoming east around
5 knots this afternoon. Lake waters smooth. Showers and
thunderstorms likely early this morning, then a chance of showers
and thunderstorms late this morning and afternoon.
.TONIGHT...Southeast winds around 5 knots in the evening,
becoming light and variable. Lake waters smooth. A chance of
showers and thunderstorms.
.TUESDAY...Northeast winds around 5 knots, becoming southeast in
the afternoon. Lake waters smooth. Showers likely. A chance of
thunderstorms in the morning, then thunderstorms likely in the
afternoon.
.TUESDAY NIGHT...South winds around 5 knots. Lake waters smooth.
A slight chance of showers and thunderstorms in the evening, then
a chance of showers and thunderstorms after midnight.
.WEDNESDAY...West winds around 5 knots, becoming south in the
afternoon. Lake waters smooth. A chance of showers and
thunderstorms.
.WEDNESDAY NIGHT...South winds around 5 knots. Lake waters
smooth. A slight chance of showers and thunderstorms after
midnight.
.THURSDAY...Southwest winds around 5 knots, becoming south in the
afternoon. Lake waters light chop. A chance of showers and
thunderstorms.
.THURSDAY NIGHT...South winds 5 to 10 knots. Lake waters light
chop. A slight chance of showers and thunderstorms after
midnight.
.FRIDAY...South winds around 5 knots, increasing to 5 to 10 knots
in the afternoon. Lake waters light chop. A chance of showers and
thunderstorms.
.FRIDAY NIGHT...South winds 5 to 10 knots. Lake waters light
chop.

Winds and waves higher in and near thunderstorms.

$$

GMZ432-111800-
Calcasieu Lake-
1211 AM CDT Mon Aug 11 2025

.TODAY...Northeast winds around 5 knots, becoming southeast late.
Lake waters smooth. Showers and thunderstorms likely, mainly this
morning.
.TONIGHT...Southeast winds around 5 knots, becoming northeast
around 5 knots after midnight. Lake waters smooth. Showers and
thunderstorms likely, mainly in the evening.
.TUESDAY...Northeast winds around 5 knots, becoming southeast in
the afternoon. Lake waters smooth. A chance of showers and
thunderstorms in the morning, then showers and thunderstorms
likely in the afternoon.
.TUESDAY NIGHT...South winds around 5 knots. Lake waters smooth.
A slight chance of showers and thunderstorms in the evening, then
a chance of showers and thunderstorms after midnight.
.WEDNESDAY...Southwest winds around 5 knots. Lake waters smooth.
A chance of showers and thunderstorms.
.WEDNESDAY NIGHT...South winds around 5 knots. Lake waters
smooth. A slight chance of showers and thunderstorms after
midnight.
.THURSDAY...Southwest winds around 5 knots, becoming south in the
afternoon. Lake waters light chop. A chance of showers and
thunderstorms.
.THURSDAY NIGHT...South winds 5 to 10 knots. Lake waters light
chop. A slight chance of showers and thunderstorms after
midnight.
.FRIDAY...South winds 5 to 10 knots. Lake waters light chop. A
chance of showers and thunderstorms.
.FRIDAY NIGHT...South winds 5 to 10 knots. Lake waters light
chop.

Winds and waves higher in and near thunderstorms.

$$

GMZ435-111800-
Vermilion and West Cote Blanche Bays-
1211 AM CDT Mon Aug 11 2025

.TODAY...Northeast winds 5 to 10 knots, becoming southeast late.
Bay waters light chop. Showers and thunderstorms likely, mainly
this morning.
.TONIGHT...Southeast winds around 5 knots. Bay waters smooth. A
chance of thunderstorms. A chance of showers.
.TUESDAY...East winds around 5 knots, becoming south in the
afternoon. Bay waters smooth. Showers and thunderstorms likely.
.TUESDAY NIGHT...South winds around 5 knots. Bay waters smooth. A
slight chance of showers and thunderstorms in the evening, then a
chance of showers and thunderstorms after midnight.
.WEDNESDAY...Southwest winds around 5 knots. Bay waters smooth.
Showers and thunderstorms likely in the morning, then showers
likely with a chance of thunderstorms in the afternoon.
.WEDNESDAY NIGHT...Southwest winds around 5 knots. Bay waters
smooth. A slight chance of showers and thunderstorms after
midnight.
.THURSDAY...Southwest winds 5 to 10 knots. Bay waters light chop.
Showers likely. A chance of thunderstorms in the morning, then
thunderstorms likely in the afternoon.
.THURSDAY NIGHT...South winds 5 to 10 knots. Bay waters light
chop. A slight chance of showers and thunderstorms after
midnight.
.FRIDAY...South winds around 5 knots. Bay waters smooth. A chance
of showers and thunderstorms.
.FRIDAY NIGHT...South winds around 5 knots. Bay waters smooth.

Winds and waves higher in and near thunderstorms.

$$

GMZ436-111800-
Atchafalaya and East Cote Blanche Bays-
1211 AM CDT Mon Aug 11 2025

.TODAY...Northeast winds around 5 knots. Bay waters smooth.
Showers and thunderstorms likely until late afternoon, then a
chance of showers and thunderstorms late.
.TONIGHT...Southeast winds around 5 knots. Bay waters smooth. A
chance of showers and thunderstorms.
.TUESDAY...East winds around 5 knots, becoming south around
5 knots in the afternoon. Bay waters smooth. Showers and
thunderstorms likely.
.TUESDAY NIGHT...South winds around 5 knots. Bay waters smooth. A
slight chance of showers and thunderstorms in the evening, then a
chance of showers and thunderstorms after midnight.
.WEDNESDAY...Southwest winds around 5 knots. Bay waters smooth.
Showers and thunderstorms likely, mainly in the morning.
.WEDNESDAY NIGHT...Southwest winds around 5 knots. Bay waters
smooth. A slight chance of showers and thunderstorms in the
evening, then a chance of showers and thunderstorms after
midnight.
.THURSDAY...Southwest winds around 5 knots. Bay waters smooth. A
chance of thunderstorms. Showers likely, mainly in the morning.
.THURSDAY NIGHT...South winds around 5 knots. Bay waters smooth.
A slight chance of showers and thunderstorms after midnight.
.FRIDAY...South winds around 5 knots. Bay waters smooth. A chance
of thunderstorms. Showers likely, mainly in the morning.
.FRIDAY NIGHT...South winds around 5 knots. Bay waters smooth.

Winds and waves higher in and near thunderstorms.

$$

GMZ450-111800-
Coastal waters from Cameron LA to High Island TX out 20 NM-
1211 AM CDT Mon Aug 11 2025

.TODAY...Northeast winds 5 to 10 knots, becoming east late. Seas
1 foot or less. Wave Detail: Southeast 1 foot at 3 seconds.
Showers and thunderstorms likely early this morning, then a
chance of showers and thunderstorms late this morning and early
afternoon. A slight chance of showers and thunderstorms late.
.TONIGHT...Southeast winds 5 to 10 knots. Seas 1 foot or less.
Wave Detail: Southeast 1 foot at 3 seconds. A slight chance of
showers and thunderstorms in the evening, then a chance of
showers and thunderstorms after midnight.
.TUESDAY...North winds around 5 knots, becoming southeast in the
afternoon. Seas 1 foot or less. Wave Detail: Southwest 1 foot at
4 seconds. A chance of showers and thunderstorms.
.TUESDAY NIGHT...South winds 5 to 10 knots. Seas around 2 feet.
Wave Detail: South 1 foot at 3 seconds. A slight chance of
showers and thunderstorms in the evening, then a chance of
showers and thunderstorms after midnight.
.WEDNESDAY...Southwest winds 5 to 10 knots, becoming south in the
afternoon. Seas around 2 feet in the morning, then 1 foot or
less. Wave Detail: South 1 foot at 4 seconds, becoming south
1 foot at 5 seconds. A chance of showers and thunderstorms,
mainly in the morning.
.WEDNESDAY NIGHT...South winds 5 to 10 knots. Seas around 2 feet.
Wave Detail: South 2 feet at 4 seconds. A chance of showers with
a slight chance of thunderstorms after midnight.
.THURSDAY...South winds 5 to 10 knots. Seas around 2 feet. A
chance of showers and thunderstorms.
.THURSDAY NIGHT...South winds around 10 knots. Seas around
2 feet. A slight chance of showers and thunderstorms after
midnight.
.FRIDAY...South winds around 10 knots. Seas around 2 feet. A
chance of showers and thunderstorms.
.FRIDAY NIGHT...South 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.

$$

GMZ452-111800-
Coastal waters from Intracoastal City to Cameron LA out 20 NM-
1211 AM CDT Mon Aug 11 2025

.TODAY...Northeast winds 5 to 10 knots, becoming southeast late.
Seas 1 foot or less. Wave Detail: East 1 foot at 3 seconds.
Showers and thunderstorms likely early this morning, then a
chance of showers and thunderstorms late this morning and
afternoon.
.TONIGHT...Southeast winds 5 to 10 knots. Seas 1 foot or less.
Wave Detail: Southeast 1 foot at 2 seconds. A chance of showers
and thunderstorms.
.TUESDAY...Northeast winds around 5 knots, becoming south in the
afternoon. Seas 1 foot or less. Wave Detail: Southwest 1 foot at
3 seconds. Showers and thunderstorms likely, mainly in the
morning.
.TUESDAY NIGHT...South winds 5 to 10 knots. Seas 1 foot or less.
Wave Detail: South 1 foot at 4 seconds. A slight chance of
showers and thunderstorms in the evening, then a chance of
showers and thunderstorms after midnight.
.WEDNESDAY...Southwest winds 5 to 10 knots. Seas around 2 feet in
the morning, then 1 foot or less. Wave Detail: South 1 foot at
5 seconds. Showers and thunderstorms likely, mainly in the
morning.
.WEDNESDAY NIGHT...South winds 5 to 10 knots. Seas 1 foot or
less, then around 2 feet after midnight. Wave Detail: South
1 foot at 5 seconds, becoming south 2 feet at 4 seconds. A chance
of showers and thunderstorms after midnight.
.THURSDAY...Southwest winds 5 to 10 knots. Seas around 2 feet in
the morning, then 1 foot or less. A chance of thunderstorms.
Showers likely, mainly in the morning.
.THURSDAY NIGHT...South winds 5 to 10 knots. Seas around 2 feet.
A chance of showers and thunderstorms after midnight.
.FRIDAY...South winds 5 to 10 knots. Seas around 2 feet in the
morning, then 1 foot or less. A chance of thunderstorms. Showers
likely, mainly in the morning.
.FRIDAY NIGHT...South 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.

$$

GMZ455-111800-
Coastal waters from Lower Atchafalaya River to Intracoastal City
LA out 20 NM-
1211 AM CDT Mon Aug 11 2025

.TODAY...Northeast winds around 5 knots. Seas 1 foot or less.
Wave Detail: East 1 foot at 2 seconds. Showers and thunderstorms
likely, mainly this morning.
.TONIGHT...Southeast winds around 5 knots, becoming south after
midnight. Seas 1 foot or less. Wave Detail: Southeast 1 foot at
2 seconds. A chance of showers and thunderstorms.
.TUESDAY...West winds around 5 knots, becoming south in the
afternoon. Seas 1 foot or less. Wave Detail: South 1 foot at
2 seconds. Showers and thunderstorms likely, mainly in the
morning.
.TUESDAY NIGHT...South winds around 5 knots. Seas 1 foot or less.
Wave Detail: South 1 foot at 2 seconds. A slight chance of
showers and thunderstorms in the evening, then showers likely
with a chance of thunderstorms after midnight.
.WEDNESDAY...Southwest winds around 5 knots. Seas 1 foot or less.
Wave Detail: Southwest 1 foot at 3 seconds. Showers and
thunderstorms likely, mainly in the morning.
.WEDNESDAY NIGHT...Southwest winds around 5 knots. Seas 1 foot or
less. Wave Detail: South 1 foot at 5 seconds. A slight chance of
showers and thunderstorms in the evening, then a chance of
showers and thunderstorms after midnight.
.THURSDAY...Southwest winds around 5 knots. Seas 1 foot or less.
A chance of thunderstorms. Showers likely, mainly in the morning.
.THURSDAY NIGHT...South winds 5 to 10 knots. Seas 1 foot or less.
A chance of showers and thunderstorms after midnight.
.FRIDAY...South winds around 5 knots. Seas 1 foot or less. A
chance of thunderstorms. Showers likely, mainly in the morning.
.FRIDAY NIGHT...South winds around 5 knots. Seas 1 foot or less.
A slight chance of showers and thunderstorms after midnight.

Winds and seas higher in and near thunderstorms.

$$

GMZ470-111800-
Coastal waters from Cameron LA to High Island TX from 20 to 60 NM-
1211 AM CDT Mon Aug 11 2025

.TODAY...South winds around 5 knots, becoming north late this
morning and early afternoon, then becoming east late. Seas 1 foot
or less. Wave Detail: Southeast 1 foot at 4 seconds. Showers and
thunderstorms likely this morning, then a slight chance of
showers and thunderstorms early this afternoon.
.TONIGHT...South winds around 5 knots. Seas 1 foot or less. Wave
Detail: Southeast 1 foot at 4 seconds. A chance of showers and
thunderstorms after midnight.
.TUESDAY...West winds around 5 knots, becoming south in the
afternoon. Seas 1 foot or less. Wave Detail: East 1 foot at
3 seconds and southwest 1 foot at 4 seconds. Showers likely with
a chance of thunderstorms in the morning, then a slight chance of
showers and thunderstorms in the afternoon.
.TUESDAY NIGHT...South winds 5 to 10 knots. Seas 1 foot or less.
Wave Detail: Southeast 1 foot at 5 seconds. A chance of showers
and thunderstorms after midnight.
.WEDNESDAY...South winds around 5 knots. Seas 1 foot or less.
Wave Detail: Southeast 1 foot at 5 seconds. A chance of showers
and thunderstorms, mainly in the morning.
.WEDNESDAY NIGHT...South winds 5 to 10 knots. Seas around 2 feet.
Wave Detail: South 2 feet at 5 seconds. A chance of showers with
a slight chance of thunderstorms after midnight.
.THURSDAY...South winds 5 to 10 knots. Seas around 2 feet. A
chance of thunderstorms. Showers likely, mainly in the morning.
.THURSDAY NIGHT...South winds around 10 knots. Seas around
2 feet. A chance of showers with a slight chance of thunderstorms
after midnight.
.FRIDAY...South winds around 10 knots. Seas around 2 feet. A
chance of showers and thunderstorms, mainly in the morning.
.FRIDAY NIGHT...South 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.

$$

GMZ472-111800-
Coastal waters from Intracoastal City to Cameron LA from 20 to
60 NM-
1211 AM CDT Mon Aug 11 2025

.TODAY...South winds around 5 knots, becoming north late this
morning and early afternoon, then becoming east late. Seas 1 foot
or less. Wave Detail: East 1 foot at 3 seconds. Showers and
thunderstorms likely this morning, then a chance of showers and
thunderstorms early this afternoon. A slight chance of showers
and thunderstorms late.
.TONIGHT...Southeast winds around 5 knots, becoming south after
midnight. Seas 1 foot or less. Wave Detail: Southeast 1 foot at
3 seconds. A slight chance of showers and thunderstorms in the
evening, then a chance of showers and thunderstorms after
midnight.
.TUESDAY...West winds around 5 knots, becoming south in the
afternoon. Seas 1 foot or less. Wave Detail: Southwest 1 foot at
4 seconds. A chance of thunderstorms. Showers likely, mainly in
the morning.
.TUESDAY NIGHT...South winds around 5 knots. Seas 1 foot or less.
Wave Detail: Southwest 1 foot at 4 seconds. A slight chance of
showers and thunderstorms in the evening, then a chance of
showers and thunderstorms after midnight.
.WEDNESDAY...Southwest winds around 5 knots. Seas 1 foot or less.
Wave Detail: South 1 foot at 5 seconds. Showers and thunderstorms
likely, mainly in the morning.
.WEDNESDAY NIGHT...South winds 5 to 10 knots. Seas around 2 feet.
Wave Detail: Southeast 2 feet at 5 seconds. A chance of showers
and thunderstorms after midnight.
.THURSDAY...South winds 5 to 10 knots. Seas around 2 feet. A
chance of thunderstorms. Showers likely, mainly in the morning.
.THURSDAY NIGHT...South winds 5 to 10 knots. Seas around 2 feet.
A chance of showers and thunderstorms after midnight.
.FRIDAY...South winds 5 to 10 knots. Seas around 2 feet. A chance
of thunderstorms. Showers likely, mainly in the morning.
.FRIDAY NIGHT...South 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.

$$

GMZ475-111800-
Coastal waters from Lower Atchafalaya River to Intracoastal City
LA from 20 to 60 NM-
1211 AM CDT Mon Aug 11 2025

.TODAY...Southwest winds around 5 knots, becoming northwest late
this morning, then becoming northeast this afternoon. Seas 1 foot
or less. Wave Detail: East 1 foot at 4 seconds. Showers and
thunderstorms likely early this morning, then a chance of showers
and thunderstorms late this morning and early afternoon. A slight
chance of showers and thunderstorms late.
.TONIGHT...Southeast winds around 5 knots, becoming southwest
after midnight. Seas 1 foot or less. Wave Detail: Southeast
1 foot at 4 seconds. A slight chance of showers and thunderstorms
in the evening, then a chance of showers and thunderstorms after
midnight.
.TUESDAY...Southwest winds around 5 knots, becoming south in the
afternoon. Seas 1 foot or less. Wave Detail: Southwest 1 foot at
3 seconds. Showers with thunderstorms likely in the morning, then
a chance of showers and thunderstorms in the afternoon.
.TUESDAY NIGHT...South winds around 5 knots. Seas 1 foot or less.
Wave Detail: Southeast 1 foot at 5 seconds. A slight chance of
showers and thunderstorms in the evening, then showers likely
with a chance of thunderstorms after midnight.
.WEDNESDAY...Southwest winds around 5 knots. Seas 1 foot or less.
Wave Detail: Southeast 1 foot at 5 seconds. Showers with
thunderstorms likely in the morning, then a chance of showers and
thunderstorms in the afternoon.
.WEDNESDAY NIGHT...South winds 5 to 10 knots. Seas 1 foot or
less, then around 2 feet after midnight. Wave Detail: Southeast
1 foot at 5 seconds, becoming south 2 feet at 5 seconds. A slight
chance of showers and thunderstorms in the evening, then a chance
of showers and thunderstorms after midnight.
.THURSDAY...South winds 5 to 10 knots. Seas around 2 feet in the
morning, then 1 foot or less. A chance of thunderstorms. Showers
likely, mainly in the morning.
.THURSDAY NIGHT...South winds 5 to 10 knots. Seas 1 foot or less.
A chance of showers and thunderstorms after midnight.
.FRIDAY...South winds around 5 knots. Seas 1 foot or less. A
chance of thunderstorms. Showers likely, mainly in the morning.
.FRIDAY NIGHT...Southeast winds around 5 knots. Seas 1 foot or
less. A slight chance of showers and thunderstorms after
midnight.

Winds and seas higher in and near thunderstorms.

$$