419
FZUS52 KCHS 121331
CWFCHS

Coastal Waters Forecast
National Weather Service Charleston SC
931 AM EDT Wed Mar 12 2025

South Santee River SC to Savannah GA out 20 NM and Savannah GA to
Altamaha Sound GA out 60 NM, including Charleston Harbor and
Grays Reef National Marine Sanctuary

AMZ300-130230-
931 AM EDT Wed Mar 12 2025

.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
High pressure is expected to prevail through the end of the week.
A cold front is expected to push through the region late in the
weekend.

$$

AMZ330-130230-
Charleston Harbor-
931 AM EDT Wed Mar 12 2025

.TODAY...W winds 5 to 10 kt, becoming S 15 kt this afternoon.
.TONIGHT...SW winds 10 kt.
.THU...SW winds 5 kt, increasing to 10 kt in the afternoon.
.THU NIGHT...SW winds 5 to 10 kt.
.FRI...N winds 5 kt, becoming SE in the afternoon.
.FRI NIGHT...SE winds 5 to 10 kt.
.SAT...S winds 10 to 15 kt.
.SAT NIGHT...S winds 15 to 20 kt. Waves 1 to 2 ft.
.SUN...S winds 15 to 20 kt. Waves 1 to 2 ft. A chance of showers
with a slight chance of tstms.
.SUN NIGHT...SW winds 15 kt. A chance of showers.

Winds and waves higher in and near tstms.

Unless otherwise noted, waves 1 foot or less.

Charleston Harbor water temperature 57 degrees.

$$

AMZ350-130230-
Waters from South Santee River to Edisto Beach SC out 20 NM-
931 AM EDT Wed Mar 12 2025

.TODAY...SW winds 5 to 10 kt, becoming S 10 to 15 kt late. Seas 2
to 3 ft. Wave Detail: SW 2 ft at 3 seconds and E 2 ft at 9
seconds.
.TONIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW
3 ft at 4 seconds and E 2 ft at 9 seconds.
.THU...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft
at 5 seconds and E 2 ft at 8 seconds.
.THU NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S
2 ft at 4 seconds and E 2 ft at 8 seconds.
.FRI...NW winds 5 kt, becoming E in the afternoon. Seas 2 ft.
Wave Detail: S 2 ft at 4 seconds and E 1 foot at 8 seconds.
.FRI NIGHT...SE winds 5 to 10 kt. Seas 2 ft. Wave Detail: S 2 ft
at 5 seconds and E 1 foot at 9 seconds.
.SAT...S winds 15 to 20 kt. Seas 3 to 4 ft.
.SAT NIGHT...S winds 20 to 25 kt. Seas 5 to 7 ft.
.SUN...S winds 20 to 25 kt. Seas 7 to 9 ft. A chance of showers
and tstms.
.SUN NIGHT...SW winds 15 to 20 kt. Seas 6 to 8 ft. A chance of
showers with a slight chance of tstms.

Winds and seas higher in and near tstms.

$$

AMZ352-130230-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
931 AM EDT Wed Mar 12 2025

.TODAY...SW winds 5 to 10 kt, becoming S 10 to 15 kt late. Seas 2
ft. Wave Detail: E 2 ft at 8 seconds and SW 1 foot at 2 seconds.
.TONIGHT...SW winds 10 to 15 kt. Seas 2 ft. Wave Detail: S 2 ft
at 4 seconds and E 2 ft at 9 seconds.
.THU...SW winds 5 to 10 kt. Seas 2 ft. Wave Detail: S 2 ft at
4 seconds and E 2 ft at 8 seconds.
.THU NIGHT...SW winds 5 to 10 kt. Seas 2 ft. Wave Detail: S 2 ft
at 4 seconds and E 1 foot at 8 seconds.
.FRI...Variable winds 5 kt. Seas 2 ft. Wave Detail: S 1 foot at
4 seconds and E 1 foot at 8 seconds.
.FRI NIGHT...SE winds 5 to 10 kt. Seas 2 ft. Wave Detail: SE 2 ft
at 5 seconds and E 1 foot at 9 seconds.
.SAT...S winds 10 to 15 kt. Seas 3 to 4 ft.
.SAT NIGHT...S winds 20 to 25 kt. Seas 5 to 7 ft. A slight chance
of showers.
.SUN...S winds 20 to 25 kt. Seas 6 to 8 ft. A chance of showers
with a slight chance of tstms.
.SUN NIGHT...SW winds 15 to 20 kt. Seas 5 to 7 ft. A chance of
showers.

Winds and seas higher in and near tstms.

$$

AMZ354-130230-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
931 AM EDT Wed Mar 12 2025

.TODAY...SW winds 5 to 10 kt, becoming S 10 to 15 kt late. Seas 2
ft. Wave Detail: NE 2 ft at 8 seconds and SW 1 foot at 3 seconds.
.TONIGHT...SW winds 10 kt. Seas 2 ft. Wave Detail: S 2 ft at
3 seconds and E 2 ft at 9 seconds.
.THU...SW winds 5 to 10 kt, becoming S in the afternoon. Seas
2 ft. Wave Detail: S 2 ft at 4 seconds and E 2 ft at 9 seconds.
.THU NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas
2 ft. Wave Detail: S 2 ft at 4 seconds and E 2 ft at 8 seconds.
.FRI...N winds 5 kt, becoming E in the afternoon. Seas 2 ft. Wave
Detail: E 2 ft at 8 seconds and S 1 foot at 4 seconds.
.FRI NIGHT...SE winds 5 to 10 kt. Seas 2 ft. Wave Detail: SE 2 ft
at 4 seconds and E 1 foot at 9 seconds.
.SAT...S winds 15 to 20 kt. Seas 3 to 4 ft.
.SAT NIGHT...S winds 20 to 25 kt. Seas 5 to 7 ft.
.SUN...S winds 20 to 25 kt. Seas 5 to 7 ft. A chance of showers
with a slight chance of tstms.
.SUN NIGHT...SW winds 15 kt. Seas 4 to 6 ft. A chance of showers.


Winds and seas higher in and near tstms.

$$

AMZ374-130230-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
931 AM EDT Wed Mar 12 2025

.TODAY...W winds 5 to 10 kt, becoming SW 10 to 15 kt late. Seas 2
to 3 ft. Wave Detail: NE 3 ft at 8 seconds and SW 1 foot at 2
seconds.
.TONIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: S
3 ft at 4 seconds and NE 3 ft at 9 seconds.
.THU...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft
at 8 seconds and SW 2 ft at 4 seconds.
.THU NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S
2 ft at 4 seconds and E 2 ft at 8 seconds.
.FRI...N winds 5 kt, becoming E in the afternoon. Seas 2 ft. Wave
Detail: E 2 ft at 8 seconds and S 1 foot at 4 seconds.
.FRI NIGHT...SE winds 5 to 10 kt, becoming S 10 to 15 kt after
midnight. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 4 seconds and E
2 ft at 9 seconds.
.SAT...S winds 15 to 20 kt. Seas 3 to 4 ft.
.SAT NIGHT...S winds 20 to 25 kt. Seas 6 to 8 ft.
.SUN...S winds 20 to 25 kt. Seas 7 to 9 ft. A chance of showers
and tstms.
.SUN NIGHT...SW winds 15 to 20 kt. Seas 6 to 8 ft. A chance of
showers with a slight chance of tstms.

Winds and seas higher in and near tstms.

$$