Whitemarsh Island, GA Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for Whitemarsh Island, GA

April 22, 2024 12:35 AM EDT (04:35 UTC) Change Location
Sunrise 6:45 AM   Sunset 8:00 PM
Moonrise 6:01 PM   Moonset 5:01 AM 
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NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.

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Marine Forecasts
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AMZ354 Waters From Savannah Ga To Altamaha Sound Ga Out 20 Nm, Including Grays Reef National Marine Sanctuary- 1204 Am Edt Mon Apr 22 2024

.small craft advisory in effect through this afternoon - .

Rest of tonight - N winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. Wave detail: nw 3 ft at 5 seconds and E 2 ft at 8 seconds.

Mon - N winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft. Wave detail: ne 4 ft at 5 seconds and E 1 ft at 8 seconds.

Mon night - NE winds 10 to 15 kt. Seas 3 to 4 ft.

Tue - NE winds 5 to 10 kt. Seas 3 to 4 ft.

Tue night - SE winds 5 to 10 kt, becoming S after midnight. Seas 2 to 3 ft.

Wed - SW winds 5 to 10 kt. Seas 2 to 3 ft.

Wed night - SW winds 10 kt. Seas 2 to 3 ft.

Thu - N winds 5 to 10 kt. Seas 2 to 3 ft.

Thu night - E winds 10 to 15 kt. Seas 2 to 3 ft.

Fri - E winds 10 to 15 kt. Seas 3 ft.

Fri night - E winds 10 to 15 kt. Seas 3 ft.

AMZ300 1204 Am Edt Mon Apr 22 2024

Synopsis for the coastal waters of south coastal south carolina and north coastal georgia - High pressure will extend across the region this week.


7 Day Forecast for Marine Location Near Whitemarsh Island, GA
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Area Discussion for - Charleston, SC
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FXUS62 KCHS 220421 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1221 AM EDT Mon Apr 22 2024

SYNOPSIS
High pressure will extend across the region this week.

NEAR TERM /UNTIL 6 AM THIS MORNING/
The cold front is well offshore and to the south. High pressure will steadily build in overnight. A few showers or sprinkles could develop over parts of the Charleston Tri-County area closer to daybreak as the upper trough swings through and interacts with a region of higher mid-level RH, but no significant rainfall is expected. Slight chance pops were introduced to account for this. Lows from the upper 40s/lower 50s inland to the mid-upper 50s at the beaches look on track.

SHORT TERM /6 AM THIS MORNING THROUGH WEDNESDAY/
Expect a quiet and dry pattern during this period. The upper trough, centered over the Mid Atlantic states on Monday, will move eastward, with the southern extent of the trough axis east of the region by late Monday/Monday night. Deep layer ridging is expected to build in from the west Monday night through Tuesday night. By Wednesday, the upper flow becomes more zonal as an upper trough passes well north of the area over NE U.S./New England area, which is expected to push the low level/surface ridge eastward into the Atlantic. Models are showing a weak surface boundary/front to sag southward into at least the northern part of the forecast area by late Wednesday. However, models differ on amount of deep layer moisture associated with this front. The GFS seems more robust than the other models. For now, continued a blended model solution for the PoPs, which keep the area dry. However, will need to monitor this time frame for the potential for increased rain chances.

Temperatures expected to be below normal Monday through Tuesday, then back to normal to slightly above by Wednesday. Highs generally in the upper 60s Monday and lower 70s by Tuesday. Monday night lows expected to be quite chilly for this time of year, in the lower to mid 40s inland, and upper 40s to lower 50s closer to the coast.
Tuesday night lows in the upper 40s to lower 50s inland, and mid to upper 50s closer to the coast.

LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/
Overview: Models continue to show that the bulk of this period will remain dry with temperatures near to slightly above normal through at least Friday, then possibly 4-6 degrees above normal by Saturday and Sunday.

A broad upper trough looks to hang on over the eastern U.S. with an associated weak surface front possibly sitting over the region Wednesday night through Thursday. This front/boundary then sags just south of the area Thursday night and Friday, then seems to wash out/weaken Friday and beyond. Again, current forecast keeps PoPs below 10% through this period. However, we will monitor the potential for higher PoPs Wednesday night through Thursday night as a broad upper level trough, weak surface boundary and increased deep layer moisture sit over the region. Low amplitude, deep layer ridging tries to build from the west Friday through Saturday, and may even increase in strength by Sunday. As the ridging builds later in the period, the low level flow veers to southeast, which will not only help to warm temperatures, but gradually increase low level RH/dewpoint temperatures. Despite increasing low level RH, current guidance keeps surface dewpoints in the upper 50s to lower 60s, highest coast, by weekend, which is not too bad.

AVIATION /04Z MONDAY THROUGH FRIDAY/
22/06Z TAF Discussion: KCHS/KJZI/KSAV: A brief stint of IFR cigs could impact KCHS and possibly KJZI through about 07-08z. Otherwise, MVFR cigs will give to VFR conditions prior to daybreak. Gusty winds near 20 kt will be possible late morning through mid-afternoon at all three terminals.

Extended Aviation Outlook: VFR will prevail through mid/late week.

MARINE
Tonight: Recent trends, some cold advection, and eventually decent isallobaric pressure climbs has prompted us to go with Small Craft Advisories on all Atlantic waters. N winds will average 15-20 kt, with frequent gusts of 25 kt or greater. Seas will build to 3-5 feet, and highest on the Charleston County waters and the Georgia waters beyond 20 nm. Winds in Charleston harbor will average near 15 kt through the night, so no advisory for that marine zone.

Monday through Friday: Cold advection and tightening pressure gradient behind a cold front is expected to produce low end SCA conditions for AMZ350 and AMZ374. Have raised an SCA for AMZ350 for later tonight through Monday, and continued SCA for AMZ374 for a longer period, through early Tuesday afternoon. The SCA for AMZ374 hangs on longer for seas of 5 to 7 feet slowly subsiding. Northeast winds of 15 to 20 knots with gusts of 25 to 28 knots possible for AMZ350 and AMZ374 through Monday. Could even see a short period of gusts to around 25 knots for AMZ352/354, especially Monday morning into early afternoon.

Expect northeast winds to gradually decrease by later Monday, fall below SCA levels all waters Monday night, generally 15 knots or less. Seas of 4 to 7 feet, highest AMZ350/374 on Monday, will subside to 3 to 5 feet Monday night and beyond, except holding on around 6 feet AMZ374 through early Tuesday afternoon.

No highlights expected by later Tuesday through Friday. A weak cold front may sag over the waters Wednesday night through thursday night, which could surge northeast winds back to 15 to 20 knots, but not expected to reach SCA levels. This front is shown by all models to push just south of the waters later Thursday night through Saturday, with northeast winds of 15 knots or less and seas 3 to 5 feet.

Rip Currents: Gusty northeast winds and building seas will lead to an elevated risk of rip currents on Monday. Have continued a Moderate risk all beaches for Monday. Decreasing winds and seas on Tuesday should lead to lower risk for rips.

CHS WATCHES/WARNINGS/ADVISORIES
GA...None.
SC...None.
MARINE...Small Craft Advisory until 8 PM EDT this evening for AMZ350.
Small Craft Advisory until 5 PM EDT this afternoon for AMZ352- 354.
Small Craft Advisory until 2 PM EDT Tuesday for AMZ374.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesinHgDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi47 min N 11G13 57°F 70°F30.00
41067 36 mi95 min 66°F2 ft
ACXS1 - ACE Basin Reserve, SC 45 mi110 min NNW 2.9 55°F 29.9853°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 48 mi35 min NNW 18G21 61°F 71°F29.9859°F
SAXG1 - Sapelo Island Reserve, GA 48 mi35 min NNW 11 58°F 30.0157°F


Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KSVN HUNTER AAF,GA 8 sm40 minN 0910 smOvercast57°F52°F82%29.97
KSAV SAVANNAH/HILTON HEAD INTL,GA 10 sm30 minNNW 0710 smOvercast55°F54°F94%30.01
KHXD HILTON HEAD,SC 20 sm20 minNNE 13G2010 smOvercast57°F52°F82%30.00
Link to 5 minute data for KSVN


Wind History from SVN
(wind in knots)
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Tide / Current for Fort Jackson, Savannah River, Georgia
   
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Fort Jackson
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Sun -- 01:55 AM EDT     0.65 feet Low Tide
Sun -- 05:36 AM EDT     Moonset
Sun -- 06:47 AM EDT     Sunrise
Sun -- 07:42 AM EDT     7.27 feet High Tide
Sun -- 02:09 PM EDT     0.61 feet Low Tide
Sun -- 06:06 PM EDT     Moonrise
Sun -- 07:58 PM EDT     Sunset
Sun -- 08:16 PM EDT     7.69 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Fort Jackson, Savannah River, Georgia, Tide feet
12
am
2.3
1
am
1.1
2
am
0.7
3
am
1.3
4
am
2.7
5
am
4.5
6
am
6.1
7
am
7.1
8
am
7.2
9
am
6.6
10
am
5.4
11
am
3.8
12
pm
2.4
1
pm
1.2
2
pm
0.6
3
pm
1
4
pm
2.3
5
pm
4
6
pm
5.8
7
pm
7.1
8
pm
7.7
9
pm
7.5
10
pm
6.5
11
pm
5



Tide / Current for Savannah River Entrance, Georgia Current
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Savannah River Entrance
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Sun -- 02:16 AM EDT     0.00 knots Slack
Sun -- 04:48 AM EDT     1.75 knots Max Flood
Sun -- 05:36 AM EDT     Moonset
Sun -- 06:47 AM EDT     Sunrise
Sun -- 08:16 AM EDT     -0.00 knots Slack
Sun -- 11:39 AM EDT     -1.63 knots Max Ebb
Sun -- 02:17 PM EDT     0.00 knots Slack
Sun -- 04:59 PM EDT     1.88 knots Max Flood
Sun -- 06:05 PM EDT     Moonrise
Sun -- 07:57 PM EDT     Sunset
Sun -- 08:41 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Savannah River Entrance, Georgia Current, knots
12
am
-1.9
1
am
-1.4
2
am
-0.3
3
am
0.8
4
am
1.6
5
am
1.7
6
am
1.5
7
am
1.1
8
am
0.3
9
am
-0.7
10
am
-1.3
11
am
-1.6
12
pm
-1.6
1
pm
-1.2
2
pm
-0.3
3
pm
0.8
4
pm
1.6
5
pm
1.9
6
pm
1.7
7
pm
1.3
8
pm
0.6
9
pm
-0.3
10
pm
-1.2
11
pm
-1.7




Weather Map
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Charleston, SC,



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