FZUS52 KCHS 182256
CWFCHS
Coastal Waters Forecast
National Weather Service Charleston SC
556 PM EST Thu Dec 18 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
AMZ300-191100-
556 PM EST Thu Dec 18 2025
.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
A coastal trough will continue to move inland today before a cold
front arrives Friday morning. High pressure will then prevail
Saturday into Sunday. Another cold front will then move across
the area Monday, with high pressure then prevailing into the
middle of next week.
$$
AMZ330-191100-
Charleston Harbor-
556 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EST TONIGHT
THROUGH FRIDAY MORNING...
.TONIGHT...S winds 10 kt, increasing to 15 kt with gusts to 25 kt
late this evening, then becoming SW with gusts to 25 kt late.
Waves 1 to 2 ft. Rain, mainly this evening. Patchy fog this
evening, then areas of fog after midnight. Patchy fog late.
.FRI...W winds 10 to 15 kt with gusts to 25 kt.
.FRI NIGHT...NW winds 5 to 10 kt.
.SAT...NE winds 5 kt.
.SAT NIGHT...Variable winds 5 kt.
.SUN...NW winds 5 kt.
.SUN NIGHT...N winds 5 to 10 kt, becoming NE 10 to 15 kt with
gusts to 20 kt after midnight.
.MON...NE winds 10 to 15 kt.
.MON NIGHT...NE winds 5 to 10 kt.
.TUE...E winds 5 kt.
.TUE NIGHT...SW winds 5 kt.
Unless otherwise noted, waves 1 foot or less.
Charleston Harbor water temperature 54 degrees.
$$
AMZ350-191100-
Waters from South Santee River to Edisto Beach SC out 20 NM-
556 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY EVENING...
.TONIGHT...S winds 15 to 20 kt, increasing to 20 to 25 kt late
this evening. Seas 5 to 7 ft, building to 7 to 9 ft after
midnight. Wave Detail: SE 7 ft at 9 seconds, becoming SE 8 ft at
8 seconds. Patchy fog this evening. Areas of fog after midnight,
then patchy fog late. Rain early this evening. A chance of rain
late this evening, then a slight chance of rain late.
.FRI...W winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Seas 7 to 9 ft, subsiding to 6 to 8 ft in the
afternoon. Wave Detail: S 8 ft at 9 seconds, becoming SE 6 ft at
9 seconds and SW 4 ft at 7 seconds.
.FRI NIGHT...NW winds 10 to 15 kt. Seas 4 to 6 ft, subsiding to
3 to 4 ft after midnight. Wave Detail: SE 4 ft at 9 seconds and
SW 3 ft at 7 seconds, becoming SE 4 ft at 9 seconds and SW 2 ft
at 5 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft
at 9 seconds and SW 1 foot at 4 seconds.
.SAT NIGHT...E winds 5 kt, becoming W after midnight. Seas 3 ft.
Wave Detail: SE 3 ft at 9 seconds and NE 1 foot at 4 seconds.
.SUN...NW winds 5 to 10 kt. Seas 3 ft. Wave Detail: SE 3 ft at
9 seconds and NE 1 foot at 4 seconds.
.SUN NIGHT...N winds 15 to 20 kt, becoming NE 20 to 25 kt after
midnight. Seas 3 to 4 ft, building to 4 to 6 ft after midnight.
.MON...NE winds 20 to 25 kt. Seas 5 to 7 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 5 to 7 ft.
.TUE...E winds 5 to 10 kt. Seas 4 to 5 ft.
.TUE NIGHT...W winds 5 to 10 kt. Seas 3 to 4 ft.
$$
AMZ352-191100-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
556 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM 10 PM EST THIS EVENING
THROUGH FRIDAY AFTERNOON...
.TONIGHT...SE winds 10 to 15 kt, becoming S 15 to 20 kt late this
evening, then becoming SW 20 to 25 kt after midnight. Seas 4 to
6 ft, building to 5 to 7 ft after midnight. Wave Detail: SE 5 ft
at 9 seconds, becoming SE 7 ft at 8 seconds. Rain early this
evening, then a chance of rain late this evening. Patchy fog this
evening. Areas of dense fog after midnight.
.FRI...W winds 15 to 20 kt with gusts to 25 kt. Seas 5 to 7 ft,
subsiding to 4 to 6 ft in the afternoon. Wave Detail: SE 7 ft at
9 seconds, becoming SE 6 ft at 9 seconds.
.FRI NIGHT...NW winds 10 to 15 kt. Seas 4 to 5 ft, subsiding to
3 to 4 ft after midnight. Wave Detail: SE 4 ft at 9 seconds and W
2 ft at 4 seconds, becoming SE 4 ft at 9 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft
at 9 seconds.
.SAT NIGHT...NE winds 5 kt, becoming W after midnight. Seas 3 ft.
Wave Detail: SE 3 ft at 9 seconds.
.SUN...NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 9 seconds.
.SUN NIGHT...N winds 10 to 15 kt, becoming NE 20 to 25 kt after
midnight. Seas 2 to 3 ft, building to 4 to 6 ft after midnight.
.MON...NE winds 20 to 25 kt. Seas 5 to 6 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 4 to 6 ft.
.TUE...E winds 5 to 10 kt. Seas 4 to 5 ft.
.TUE NIGHT...SW winds 5 kt. Seas 3 to 4 ft.
$$
AMZ354-191100-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
556 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EST TONIGHT
THROUGH FRIDAY AFTERNOON...
.TONIGHT...SE winds 10 to 15 kt, becoming SW 15 to 20 kt late
this evening. Seas 4 to 5 ft, building to 4 to 6 ft after
midnight. Wave Detail: SE 5 ft at 8 seconds, becoming SE 6 ft at
8 seconds. Rain early this evening, then a chance of rain late
this evening. Patchy fog early this evening, then areas of dense
fog late this evening.
.FRI...W winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 4 to 6 ft, subsiding to 4 to 5 ft in the
afternoon. Wave Detail: SE 6 ft at 9 seconds, becoming SE 5 ft at
9 seconds.
.FRI NIGHT...NW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail:
SE 4 ft at 9 seconds and NW 2 ft at 3 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft
at 9 seconds.
.SAT NIGHT...NE winds 5 kt, becoming W after midnight. Seas 2 to
3 ft. Wave Detail: SE 3 ft at 9 seconds.
.SUN...NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 9 seconds.
.SUN NIGHT...N winds 10 to 15 kt, becoming NE 20 to 25 kt after
midnight. Seas 2 to 3 ft, building to 4 to 6 ft after midnight.
.MON...NE winds 20 to 25 kt. Seas 5 to 7 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 5 to 7 ft.
.TUE...NE winds 5 to 10 kt. Seas 4 to 5 ft.
.TUE NIGHT...SW winds 5 kt. Seas 4 to 5 ft.
$$
AMZ374-191100-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
556 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY EVENING...
.TONIGHT...S winds 15 to 20 kt with gusts to 25 kt, becoming SW
20 to 25 kt with gusts to 35 kt late this evening. Seas 5 to
7 ft, building to 6 to 8 ft after midnight. Wave Detail: SE 7 ft
at 8 seconds, becoming S 7 ft at 8 seconds. Rain likely early
this evening, then a chance of rain late this evening. Patchy fog
until early morning.
.FRI...W winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Seas 6 to 8 ft, subsiding to 5 to 7 ft in the
afternoon. Wave Detail: S 7 ft at 7 seconds and SE 6 ft at
9 seconds, becoming SE 5 ft at 9 seconds and W 4 ft at 4 seconds.
.FRI NIGHT...NW winds 15 to 20 kt, becoming N 10 to 15 kt after
midnight. Seas 4 to 6 ft, subsiding to 4 to 5 ft after midnight.
Wave Detail: SE 4 ft at 9 seconds and NW 3 ft at 4 seconds.
.SAT...NE winds 5 to 10 kt. Seas 4 to 5 ft, subsiding to 3 to
4 ft in the afternoon. Wave Detail: SE 4 ft at 9 seconds and N
2 ft at 4 seconds, becoming SE 4 ft at 9 seconds.
.SAT NIGHT...SE winds 5 kt, becoming W after midnight. Seas 3 to
4 ft. Wave Detail: SE 4 ft at 9 seconds.
.SUN...NW winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft
at 9 seconds.
.SUN NIGHT...N winds 15 to 20 kt, becoming NE 20 to 25 kt with
gusts to 30 kt after midnight. Seas 4 to 5 ft, building to 4 to
6 ft after midnight.
.MON...NE winds 20 to 25 kt. Seas 7 to 9 ft.
.MON NIGHT...E winds 15 to 20 kt. Seas 6 to 8 ft. A slight chance
of rain.
.TUE...E winds 5 to 10 kt. Seas 5 to 7 ft.
.TUE NIGHT...SW winds 5 kt. Seas 4 to 6 ft.
$$
CWFCHS
Coastal Waters Forecast
National Weather Service Charleston SC
556 PM EST Thu Dec 18 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
AMZ300-191100-
556 PM EST Thu Dec 18 2025
.Synopsis for the coastal waters of south coastal South Carolina
and north coastal Georgia...
A coastal trough will continue to move inland today before a cold
front arrives Friday morning. High pressure will then prevail
Saturday into Sunday. Another cold front will then move across
the area Monday, with high pressure then prevailing into the
middle of next week.
$$
AMZ330-191100-
Charleston Harbor-
556 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EST TONIGHT
THROUGH FRIDAY MORNING...
.TONIGHT...S winds 10 kt, increasing to 15 kt with gusts to 25 kt
late this evening, then becoming SW with gusts to 25 kt late.
Waves 1 to 2 ft. Rain, mainly this evening. Patchy fog this
evening, then areas of fog after midnight. Patchy fog late.
.FRI...W winds 10 to 15 kt with gusts to 25 kt.
.FRI NIGHT...NW winds 5 to 10 kt.
.SAT...NE winds 5 kt.
.SAT NIGHT...Variable winds 5 kt.
.SUN...NW winds 5 kt.
.SUN NIGHT...N winds 5 to 10 kt, becoming NE 10 to 15 kt with
gusts to 20 kt after midnight.
.MON...NE winds 10 to 15 kt.
.MON NIGHT...NE winds 5 to 10 kt.
.TUE...E winds 5 kt.
.TUE NIGHT...SW winds 5 kt.
Unless otherwise noted, waves 1 foot or less.
Charleston Harbor water temperature 54 degrees.
$$
AMZ350-191100-
Waters from South Santee River to Edisto Beach SC out 20 NM-
556 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY EVENING...
.TONIGHT...S winds 15 to 20 kt, increasing to 20 to 25 kt late
this evening. Seas 5 to 7 ft, building to 7 to 9 ft after
midnight. Wave Detail: SE 7 ft at 9 seconds, becoming SE 8 ft at
8 seconds. Patchy fog this evening. Areas of fog after midnight,
then patchy fog late. Rain early this evening. A chance of rain
late this evening, then a slight chance of rain late.
.FRI...W winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Seas 7 to 9 ft, subsiding to 6 to 8 ft in the
afternoon. Wave Detail: S 8 ft at 9 seconds, becoming SE 6 ft at
9 seconds and SW 4 ft at 7 seconds.
.FRI NIGHT...NW winds 10 to 15 kt. Seas 4 to 6 ft, subsiding to
3 to 4 ft after midnight. Wave Detail: SE 4 ft at 9 seconds and
SW 3 ft at 7 seconds, becoming SE 4 ft at 9 seconds and SW 2 ft
at 5 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft
at 9 seconds and SW 1 foot at 4 seconds.
.SAT NIGHT...E winds 5 kt, becoming W after midnight. Seas 3 ft.
Wave Detail: SE 3 ft at 9 seconds and NE 1 foot at 4 seconds.
.SUN...NW winds 5 to 10 kt. Seas 3 ft. Wave Detail: SE 3 ft at
9 seconds and NE 1 foot at 4 seconds.
.SUN NIGHT...N winds 15 to 20 kt, becoming NE 20 to 25 kt after
midnight. Seas 3 to 4 ft, building to 4 to 6 ft after midnight.
.MON...NE winds 20 to 25 kt. Seas 5 to 7 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 5 to 7 ft.
.TUE...E winds 5 to 10 kt. Seas 4 to 5 ft.
.TUE NIGHT...W winds 5 to 10 kt. Seas 3 to 4 ft.
$$
AMZ352-191100-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
556 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM 10 PM EST THIS EVENING
THROUGH FRIDAY AFTERNOON...
.TONIGHT...SE winds 10 to 15 kt, becoming S 15 to 20 kt late this
evening, then becoming SW 20 to 25 kt after midnight. Seas 4 to
6 ft, building to 5 to 7 ft after midnight. Wave Detail: SE 5 ft
at 9 seconds, becoming SE 7 ft at 8 seconds. Rain early this
evening, then a chance of rain late this evening. Patchy fog this
evening. Areas of dense fog after midnight.
.FRI...W winds 15 to 20 kt with gusts to 25 kt. Seas 5 to 7 ft,
subsiding to 4 to 6 ft in the afternoon. Wave Detail: SE 7 ft at
9 seconds, becoming SE 6 ft at 9 seconds.
.FRI NIGHT...NW winds 10 to 15 kt. Seas 4 to 5 ft, subsiding to
3 to 4 ft after midnight. Wave Detail: SE 4 ft at 9 seconds and W
2 ft at 4 seconds, becoming SE 4 ft at 9 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft
at 9 seconds.
.SAT NIGHT...NE winds 5 kt, becoming W after midnight. Seas 3 ft.
Wave Detail: SE 3 ft at 9 seconds.
.SUN...NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 9 seconds.
.SUN NIGHT...N winds 10 to 15 kt, becoming NE 20 to 25 kt after
midnight. Seas 2 to 3 ft, building to 4 to 6 ft after midnight.
.MON...NE winds 20 to 25 kt. Seas 5 to 6 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 4 to 6 ft.
.TUE...E winds 5 to 10 kt. Seas 4 to 5 ft.
.TUE NIGHT...SW winds 5 kt. Seas 3 to 4 ft.
$$
AMZ354-191100-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
556 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EST TONIGHT
THROUGH FRIDAY AFTERNOON...
.TONIGHT...SE winds 10 to 15 kt, becoming SW 15 to 20 kt late
this evening. Seas 4 to 5 ft, building to 4 to 6 ft after
midnight. Wave Detail: SE 5 ft at 8 seconds, becoming SE 6 ft at
8 seconds. Rain early this evening, then a chance of rain late
this evening. Patchy fog early this evening, then areas of dense
fog late this evening.
.FRI...W winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Seas 4 to 6 ft, subsiding to 4 to 5 ft in the
afternoon. Wave Detail: SE 6 ft at 9 seconds, becoming SE 5 ft at
9 seconds.
.FRI NIGHT...NW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail:
SE 4 ft at 9 seconds and NW 2 ft at 3 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft
at 9 seconds.
.SAT NIGHT...NE winds 5 kt, becoming W after midnight. Seas 2 to
3 ft. Wave Detail: SE 3 ft at 9 seconds.
.SUN...NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft
at 9 seconds.
.SUN NIGHT...N winds 10 to 15 kt, becoming NE 20 to 25 kt after
midnight. Seas 2 to 3 ft, building to 4 to 6 ft after midnight.
.MON...NE winds 20 to 25 kt. Seas 5 to 7 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 5 to 7 ft.
.TUE...NE winds 5 to 10 kt. Seas 4 to 5 ft.
.TUE NIGHT...SW winds 5 kt. Seas 4 to 5 ft.
$$
AMZ374-191100-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
556 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY EVENING...
.TONIGHT...S winds 15 to 20 kt with gusts to 25 kt, becoming SW
20 to 25 kt with gusts to 35 kt late this evening. Seas 5 to
7 ft, building to 6 to 8 ft after midnight. Wave Detail: SE 7 ft
at 8 seconds, becoming S 7 ft at 8 seconds. Rain likely early
this evening, then a chance of rain late this evening. Patchy fog
until early morning.
.FRI...W winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Seas 6 to 8 ft, subsiding to 5 to 7 ft in the
afternoon. Wave Detail: S 7 ft at 7 seconds and SE 6 ft at
9 seconds, becoming SE 5 ft at 9 seconds and W 4 ft at 4 seconds.
.FRI NIGHT...NW winds 15 to 20 kt, becoming N 10 to 15 kt after
midnight. Seas 4 to 6 ft, subsiding to 4 to 5 ft after midnight.
Wave Detail: SE 4 ft at 9 seconds and NW 3 ft at 4 seconds.
.SAT...NE winds 5 to 10 kt. Seas 4 to 5 ft, subsiding to 3 to
4 ft in the afternoon. Wave Detail: SE 4 ft at 9 seconds and N
2 ft at 4 seconds, becoming SE 4 ft at 9 seconds.
.SAT NIGHT...SE winds 5 kt, becoming W after midnight. Seas 3 to
4 ft. Wave Detail: SE 4 ft at 9 seconds.
.SUN...NW winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft
at 9 seconds.
.SUN NIGHT...N winds 15 to 20 kt, becoming NE 20 to 25 kt with
gusts to 30 kt after midnight. Seas 4 to 5 ft, building to 4 to
6 ft after midnight.
.MON...NE winds 20 to 25 kt. Seas 7 to 9 ft.
.MON NIGHT...E winds 15 to 20 kt. Seas 6 to 8 ft. A slight chance
of rain.
.TUE...E winds 5 to 10 kt. Seas 5 to 7 ft.
.TUE NIGHT...SW winds 5 kt. Seas 4 to 6 ft.
$$