FZUS52 KCHS 181745
CWFCHS
Coastal Waters Forecast
National Weather Service Charleston SC
1245 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
AMZ300-190600-
1245 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.
$$
AMZ330-190600-
Charleston Harbor-
1245 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EST TONIGHT
THROUGH FRIDAY MORNING...
.THIS AFTERNOON...SE winds 10 kt. A slight chance of showers
early, then showers with a chance of tstms late.
.TONIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt after
midnight. Waves 1 to 2 ft. Showers with a chance of tstms in the
evening, then a chance of showers and tstms after midnight. Vsby
1 to 3 NM, decreasing to 1 NM or less after midnight.
.FRI...W winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Waves 1 to 2 ft.
.FRI NIGHT...NW winds 5 to 10 kt.
.SAT...NE winds 5 kt.
.SAT NIGHT...Variable winds 5 kt.
.SUN...NW winds 5 kt.
.SUN NIGHT...N winds 10 to 15 kt.
.MON...NE winds 10 to 15 kt.
.MON NIGHT...NE winds 5 to 10 kt.
Winds and waves higher in and near tstms.
Unless otherwise noted, waves 1 foot or less.
Charleston Harbor water temperature 54 degrees.
$$
AMZ350-190600-
Waters from South Santee River to Edisto Beach SC out 20 NM-
1245 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM 7 PM EST THIS EVENING
THROUGH FRIDAY EVENING...
.THIS AFTERNOON...SE winds 10 to 15 kt. Seas 4 to 5 ft. Wave
Detail: SE 4 ft at 8 seconds. A slight chance of showers early,
then showers with a chance of tstms late with vsby 1 to 3 NM.
.TONIGHT...S winds 15 to 20 kt, becoming SW 20 to 25 kt after
midnight. 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.
Showers with a chance of tstms in the evening, then a chance of
showers and tstms after midnight. Vsby 1 to 3 NM, decreasing to
1 NM or less after midnight.
.FRI...W winds 20 to 25 kt with gusts to 35 kt, diminishing to
15 to 20 kt with gusts to 25 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.
.SUN NIGHT...N winds 20 to 25 kt. Seas 4 to 6 ft.
.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.
Winds and seas higher in and near tstms.
$$
AMZ352-190600-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
1245 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM 10 PM EST THIS EVENING
THROUGH FRIDAY AFTERNOON...
.THIS AFTERNOON...SE winds 10 to 15 kt. Seas 3 to 4 ft. Wave
Detail: SE 4 ft at 8 seconds. A chance of showers with a slight
chance of tstms early, then showers with a chance of tstms late.
.TONIGHT...S winds 10 to 15 kt, becoming SW 20 to 25 kt after
midnight. Seas 4 to 6 ft, building to 5 to 7 ft after midnight.
Wave Detail: SE 5 ft at 9 seconds, becoming SE 7 ft at 8 seconds.
Showers with a chance of tstms in the evening, then a chance of
showers with a slight chance of tstms after midnight. Vsby 1 to
3 NM, decreasing to 1 NM or less after midnight.
.FRI...W winds 15 to 20 kt with gusts to 25 kt. Seas 5 to 7 ft,
subsiding to 4 to 6 ft in the afternoon. Wave Detail: SE 7 ft at
9 seconds, becoming SE 6 ft at 9 seconds.
.FRI NIGHT...NW winds 10 to 15 kt. Seas 4 to 5 ft, subsiding to
3 to 4 ft after midnight. Wave Detail: SE 4 ft at 9 seconds and W
2 ft at 4 seconds, becoming SE 4 ft at 9 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft
at 9 seconds.
.SAT NIGHT...NE winds 5 kt, becoming W after midnight. Seas 3 ft.
Wave Detail: SE 3 ft at 9 seconds.
.SUN...NW winds 5 to 10 kt. Seas 2 to 3 ft.
.SUN NIGHT...NE winds 20 to 25 kt. Seas 4 to 5 ft.
.MON...NE winds 20 to 25 kt. Seas 5 to 6 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 4 to 6 ft.
Winds and seas higher in and near tstms.
$$
AMZ354-190600-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
1245 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EST TONIGHT
THROUGH FRIDAY AFTERNOON...
.THIS AFTERNOON...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: SE 3 ft at 6 seconds and E 2 ft at 10 seconds. Showers
likely. A slight chance of tstms early, then a chance of tstms
late with vsby 1 to 3 NM.
.TONIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt after
midnight. 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.
Showers with a chance of tstms in the evening, then a chance of
showers with a slight chance of tstms after midnight. Vsby 1 to
3 NM, decreasing to 1 NM or less after midnight.
.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.
.SUN NIGHT...NE winds 20 to 25 kt. Seas 4 to 5 ft.
.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.
Winds and seas higher in and near tstms.
$$
AMZ374-190600-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
1245 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM 4 PM EST THIS AFTERNOON
THROUGH FRIDAY EVENING...
.THIS AFTERNOON...SE winds 10 to 15 kt with gusts to 20 kt. Seas
4 to 6 ft. Wave Detail: SE 5 ft at 8 seconds. Showers likely. A
slight chance of tstms early, then a chance of tstms late.
.TONIGHT...S winds 15 to 20 kt, becoming SW 20 to 25 kt after
midnight. Seas 5 to 7 ft, building to 6 to 8 ft after midnight.
Wave Detail: SE 7 ft at 8 seconds, becoming S 7 ft at 8 seconds.
Showers with a chance of tstms in the evening, then a chance of
showers with a slight chance of tstms after midnight. Vsby 1 to
3 NM.
.FRI...W winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Seas 6 to 8 ft, subsiding to 5 to 7 ft in the
afternoon. Wave Detail: S 7 ft at 7 seconds and SE 6 ft at
9 seconds, becoming SE 5 ft at 9 seconds and W 4 ft at 4 seconds.
.FRI NIGHT...NW winds 15 to 20 kt, becoming N 10 to 15 kt after
midnight. Seas 4 to 6 ft, subsiding to 4 to 5 ft after midnight.
Wave Detail: SE 4 ft at 9 seconds and NW 3 ft at 4 seconds.
.SAT...NE winds 5 to 10 kt. Seas 4 to 5 ft, subsiding to 3 to
4 ft in the afternoon. Wave Detail: SE 4 ft at 9 seconds and N
2 ft at 4 seconds, becoming SE 4 ft at 9 seconds.
.SAT NIGHT...SE winds 5 kt, becoming W after midnight. Seas 3 to
4 ft. Wave Detail: SE 4 ft at 9 seconds.
.SUN...NW winds 5 to 10 kt. Seas 3 to 4 ft.
.SUN NIGHT...NE winds 20 to 25 kt. Seas 4 to 6 ft.
.MON...NE winds 20 to 25 kt. Seas 7 to 9 ft.
.MON NIGHT...E winds 15 to 20 kt. Seas 6 to 8 ft. A slight chance
of rain.
Winds and seas higher in and near tstms.
$$
CWFCHS
Coastal Waters Forecast
National Weather Service Charleston SC
1245 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
AMZ300-190600-
1245 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.
$$
AMZ330-190600-
Charleston Harbor-
1245 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EST TONIGHT
THROUGH FRIDAY MORNING...
.THIS AFTERNOON...SE winds 10 kt. A slight chance of showers
early, then showers with a chance of tstms late.
.TONIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt after
midnight. Waves 1 to 2 ft. Showers with a chance of tstms in the
evening, then a chance of showers and tstms after midnight. Vsby
1 to 3 NM, decreasing to 1 NM or less after midnight.
.FRI...W winds 15 to 20 kt, diminishing to 10 to 15 kt in the
afternoon. Waves 1 to 2 ft.
.FRI NIGHT...NW winds 5 to 10 kt.
.SAT...NE winds 5 kt.
.SAT NIGHT...Variable winds 5 kt.
.SUN...NW winds 5 kt.
.SUN NIGHT...N winds 10 to 15 kt.
.MON...NE winds 10 to 15 kt.
.MON NIGHT...NE winds 5 to 10 kt.
Winds and waves higher in and near tstms.
Unless otherwise noted, waves 1 foot or less.
Charleston Harbor water temperature 54 degrees.
$$
AMZ350-190600-
Waters from South Santee River to Edisto Beach SC out 20 NM-
1245 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM 7 PM EST THIS EVENING
THROUGH FRIDAY EVENING...
.THIS AFTERNOON...SE winds 10 to 15 kt. Seas 4 to 5 ft. Wave
Detail: SE 4 ft at 8 seconds. A slight chance of showers early,
then showers with a chance of tstms late with vsby 1 to 3 NM.
.TONIGHT...S winds 15 to 20 kt, becoming SW 20 to 25 kt after
midnight. 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.
Showers with a chance of tstms in the evening, then a chance of
showers and tstms after midnight. Vsby 1 to 3 NM, decreasing to
1 NM or less after midnight.
.FRI...W winds 20 to 25 kt with gusts to 35 kt, diminishing to
15 to 20 kt with gusts to 25 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.
.SUN NIGHT...N winds 20 to 25 kt. Seas 4 to 6 ft.
.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.
Winds and seas higher in and near tstms.
$$
AMZ352-190600-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
1245 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM 10 PM EST THIS EVENING
THROUGH FRIDAY AFTERNOON...
.THIS AFTERNOON...SE winds 10 to 15 kt. Seas 3 to 4 ft. Wave
Detail: SE 4 ft at 8 seconds. A chance of showers with a slight
chance of tstms early, then showers with a chance of tstms late.
.TONIGHT...S winds 10 to 15 kt, becoming SW 20 to 25 kt after
midnight. Seas 4 to 6 ft, building to 5 to 7 ft after midnight.
Wave Detail: SE 5 ft at 9 seconds, becoming SE 7 ft at 8 seconds.
Showers with a chance of tstms in the evening, then a chance of
showers with a slight chance of tstms after midnight. Vsby 1 to
3 NM, decreasing to 1 NM or less after midnight.
.FRI...W winds 15 to 20 kt with gusts to 25 kt. Seas 5 to 7 ft,
subsiding to 4 to 6 ft in the afternoon. Wave Detail: SE 7 ft at
9 seconds, becoming SE 6 ft at 9 seconds.
.FRI NIGHT...NW winds 10 to 15 kt. Seas 4 to 5 ft, subsiding to
3 to 4 ft after midnight. Wave Detail: SE 4 ft at 9 seconds and W
2 ft at 4 seconds, becoming SE 4 ft at 9 seconds.
.SAT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft
at 9 seconds.
.SAT NIGHT...NE winds 5 kt, becoming W after midnight. Seas 3 ft.
Wave Detail: SE 3 ft at 9 seconds.
.SUN...NW winds 5 to 10 kt. Seas 2 to 3 ft.
.SUN NIGHT...NE winds 20 to 25 kt. Seas 4 to 5 ft.
.MON...NE winds 20 to 25 kt. Seas 5 to 6 ft.
.MON NIGHT...NE winds 15 to 20 kt. Seas 4 to 6 ft.
Winds and seas higher in and near tstms.
$$
AMZ354-190600-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
1245 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EST TONIGHT
THROUGH FRIDAY AFTERNOON...
.THIS AFTERNOON...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave
Detail: SE 3 ft at 6 seconds and E 2 ft at 10 seconds. Showers
likely. A slight chance of tstms early, then a chance of tstms
late with vsby 1 to 3 NM.
.TONIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt after
midnight. 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.
Showers with a chance of tstms in the evening, then a chance of
showers with a slight chance of tstms after midnight. Vsby 1 to
3 NM, decreasing to 1 NM or less after midnight.
.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.
.SUN NIGHT...NE winds 20 to 25 kt. Seas 4 to 5 ft.
.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.
Winds and seas higher in and near tstms.
$$
AMZ374-190600-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
1245 PM EST Thu Dec 18 2025
...SMALL CRAFT ADVISORY IN EFFECT FROM 4 PM EST THIS AFTERNOON
THROUGH FRIDAY EVENING...
.THIS AFTERNOON...SE winds 10 to 15 kt with gusts to 20 kt. Seas
4 to 6 ft. Wave Detail: SE 5 ft at 8 seconds. Showers likely. A
slight chance of tstms early, then a chance of tstms late.
.TONIGHT...S winds 15 to 20 kt, becoming SW 20 to 25 kt after
midnight. Seas 5 to 7 ft, building to 6 to 8 ft after midnight.
Wave Detail: SE 7 ft at 8 seconds, becoming S 7 ft at 8 seconds.
Showers with a chance of tstms in the evening, then a chance of
showers with a slight chance of tstms after midnight. Vsby 1 to
3 NM.
.FRI...W winds 20 to 25 kt, diminishing to 15 to 20 kt in the
afternoon. Seas 6 to 8 ft, subsiding to 5 to 7 ft in the
afternoon. Wave Detail: S 7 ft at 7 seconds and SE 6 ft at
9 seconds, becoming SE 5 ft at 9 seconds and W 4 ft at 4 seconds.
.FRI NIGHT...NW winds 15 to 20 kt, becoming N 10 to 15 kt after
midnight. Seas 4 to 6 ft, subsiding to 4 to 5 ft after midnight.
Wave Detail: SE 4 ft at 9 seconds and NW 3 ft at 4 seconds.
.SAT...NE winds 5 to 10 kt. Seas 4 to 5 ft, subsiding to 3 to
4 ft in the afternoon. Wave Detail: SE 4 ft at 9 seconds and N
2 ft at 4 seconds, becoming SE 4 ft at 9 seconds.
.SAT NIGHT...SE winds 5 kt, becoming W after midnight. Seas 3 to
4 ft. Wave Detail: SE 4 ft at 9 seconds.
.SUN...NW winds 5 to 10 kt. Seas 3 to 4 ft.
.SUN NIGHT...NE winds 20 to 25 kt. Seas 4 to 6 ft.
.MON...NE winds 20 to 25 kt. Seas 7 to 9 ft.
.MON NIGHT...E winds 15 to 20 kt. Seas 6 to 8 ft. A slight chance
of rain.
Winds and seas higher in and near tstms.
$$