Marine Weather Net

Savannah, GA to Altamaha Sound, GA including Grays Reef National Marine Sanctuary Marine Forecast




5 - 10


5 - 10


5 - 10

The Marine Weather Forecast In Detail:
AMZ354 Forecast Issued: 636 PM EDT Wed Apr 17 2024

Rest Of Tonight...S Winds 10 Kt. Seas 2 To 3 Ft. Wave Detail: S 2 Ft At 4 Seconds And Se 2 Ft At 9 Seconds.
Thu...Sw Winds 5 To 10 Kt, Becoming S 10 To 15 Kt In The Afternoon. Seas 2 To 3 Ft. Wave Detail: Se 2 Ft At 5 Seconds And E 2 Ft At 9 Seconds.
Thu Night...S Winds 5 To 10 Kt. Seas 2 To 3 Ft. Wave Detail: Se 3 Ft At 9 Seconds.
Fri...Sw Winds 5 To 10 Kt, Becoming S In The Afternoon. Seas 2 To 3 Ft. Wave Detail: Se 3 Ft At 9 Seconds.
Fri Night...S Winds 5 To 10 Kt. Seas 2 To 3 Ft. Wave Detail: Se 3 Ft At 9 Seconds.
Sat...W Winds 5 To 10 Kt, Becoming S In The Afternoon. Seas 2 Ft. Wave Detail: Se 2 Ft At 5 Seconds And Se 2 Ft At 9 Seconds. A Slight Chance Of Showers And Tstms In The Afternoon.
Sat Night...S Winds 10 Kt, Becoming W After Midnight. Seas 2 To 3 Ft. A Slight Chance Of Showers And Tstms.
Sun...Ne Winds 5 To 10 Kt. Seas 3 To 4 Ft. A Chance Of Showers With A Slight Chance Of Tstms.
Sun Night...Ne Winds 10 To 15 Kt. Seas 3 To 4 Ft. Showers Likely With A Slight Chance Of Tstms.
Mon...N Winds 10 To 15 Kt. Seas 2 To 3 Ft. A Chance Of Showers.
Mon Night...Ne Winds 10 Kt. Seas 2 To 3 Ft. Winds And Seas Higher In And Near Tstms.
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Area Forecast Discussion
National Weather Service Charleston SC
723pm EDT Wednesday April 17 2024

High pressure will persist through the end of the work week. A cold front is looking to bring a bit more unsettled weather to our area this weekend. High pressure returns early next week.

Near Term - Until 6am Thursday Morning
At 720 PM: KCLX showed a fine line of light returns extending from northern Long County northeast to northern Colleton County, drifting inland. This feature was associated with a progressive sea breeze. The rest of the evening across the forecast area should favor steady south winds and BKN high clouds.

Regional radar indicated areas of weakening showers across NC, streaming east. These weak showers should slowly dissipate as they track southeast along a weak backdoor front. Isolated showers may persist late tonight, reaching portions of the inland CWA, highlighted with SCHC PoPs. Otherwise, thick high clouds and light SSW winds should limit cooling tonight to the mid 60s for most locations.

Short Term - 6am Thursday Morning Through Saturday
Larger scale pattern flattens/becomes a bit more progressive across the CONUS for the latter half of the week as a deeper closed low skirts across south-central Canada and the Northern Plains region. Surface high pressure offshore across the Bermuda region will be weakening through the period. Some semblance of weak "backdoor" boundary may be sagging down through the region on Thursday while the southern tail end of a better defined boundary presses into and potentially stalls across the southeast region later Friday and into Saturday. Precip chances with these features remain the main forecast concern.

Thursday/Thursday night: As mentioned, a weak "backdoor" boundary is looking to sag down through the region early Thursday with little fanfare, although there could be some lingering nuisance isolated showers exiting the far reaches of the forecast area early on. But the main effect will be to suppress much of the high cloud cover down and out of our area with trend toward increasing sunshine throughout the day along with well above daytime highs in the upper 80s to around 90F. With the warm temperatures and modestly higher surface dewpoints, there is some potential for a few pop-up showers to develop during the afternoon, particularly along an inland pressing sea breeze and across the tri-county area where low level moisture/instability will be greatest. We have opted to leave the forecast dry for now. Dry weather anticipated Thursday night with temperatures dipping into the 60s.

Friday And Saturday
Remaining warm but with increasing shower chances. Southern tail end of a second boundary is looking to press into the region on Friday before slowing/stalling across the southeast region later Friday and through the day Saturday. Modest moisture and instability along/ahead of the boundary will lead to at least some increasing risk for showers and possibly a few thunderstorms across the region, particularly during the daytime hours. Of note; forecast soundings across the area on Saturday show a fair amount of instability and increased winds aloft suggesting at least the possibility of a couple of stronger storms. We will continue to monitor forecast trends.

Otherwise, very warm temperatures continue with highs in the upper 80s and lows in the 60s through the period.

Long Term - Saturday Night Through Wednesday
Overall zonal flow pattern is looking to remain in place across the CONUS through the latter half of the weekend before a piece of northern stream short-wave energy dives out of the Plains and through the Mid-Atlantic/southeast CONUS region and acts to develop a bit more troughiness across the east into next week. Secondary surface wave may be developing in the northern Gulf along the stalled boundary and lifting up through the southeast states and off the Carolina coasts Sunday into Monday, and finally acting to suppress the boundary down into northern Florida. The better rain chances are still shaping up to be later Sunday/Sunday night as the surface wave moves up through the region, subject to further refinement in later forecasts, with showers lingering into Monday. Sunday has the look of a cool air wedge developing through Carolinas into Georgia north of the surface wave track, setting the stage for an abrupt cool down in temperatures as reflected in the latest MAV guidance (upper 80s Saturday to the lower-middle 70s on Sunday).

Surface high pressure redevelops across the region for Tuesday into the middle of next week with a subsequent drying trend and rebounding temperatures.

Tonight: High pressure will dominate across the local marine waters tonight, with SW winds around 10 knots expected. A few gusts around 20 knots are possible along the direct coastline this afternoon associated with the sea breeze. Seas will average 2 to 3 feet.

Thursday through Monday: High pressure near Bermuda will remain the dominant player through at least Thursday with overall south to southwesterly flow. Winds will be locally enhanced along the coast during the afternoon into the evening with formation of a sea breeze. But with gusts 20 knots or less and seas 2 to 3 feet, marine headlines are not anticipated.

Surface boundary will be pressing into the southeast states later Friday, potentially stalling across the region into the weekend before finally pressing through the region late in the weekend into Monday. Overall southerly/southwesterly flow will persist through much of the weekend before shifting into the north/northeast thereafter. Seas remain largely 3 feet or less through much of the weekend before north to northeasterly flow behind the boundary leads to building seas early next week.

NOAA Charleston SC Office: Watches - Warnings - Advisories
GA...None. SC...None.