St. Simons, GA Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for St. Simons, GA


December 11, 2023 1:27 AM EST (06:27 UTC)
Sunrise 7:12AM   Sunset 5:25PM   Moonrise  5:54AM   Moonset 4:11PM 

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. Privacy and Cookie policy

Marine Forecasts
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AMZ450 Coastal Waters From Altamaha Sound To Fernandina Beach Fl Out 20 Nm- Coastal Waters From Fernandina Beach To St. Augustine Fl Out 20 Nm- Coastal Waters From St. Augustine To Flagler Beach Fl Out 20 Nm- 720 Pm Est Sun Dec 10 2023
.small craft advisory in effect through Monday morning...
Rest of tonight..Southwest winds 20 to 25 knots, becoming northwest after midnight. Gusts up to 35 knots. Seas 3 to 5 feet with a dominant period 7 seconds. Intracoastal waters rough. Showers likely with a slight chance of Thunderstorms in the evening.
Monday..Northwest winds 15 to 20 knots, becoming north 10 to 15 knots in the afternoon. Seas 3 to 5 feet with a dominant period 7 seconds. Intracoastal waters choppy.
Monday night..North winds 10 to 15 knots. Seas 2 to 4 feet with a dominant period 8 seconds. Intracoastal waters a moderate chop.
Tuesday..Northeast winds 15 to 20 knots. Seas 3 to 5 feet with a dominant period 8 seconds. Intracoastal waters choppy.
Tuesday night..Northeast winds 15 to 20 knots. Seas 4 to 6 feet with a dominant period 6 seconds. Intracoastal waters choppy.
Wednesday..Northeast winds 15 to 20 knots. Seas 5 to 6 feet with a dominant period 6 seconds. Intracoastal waters choppy.
Wednesday night..Northeast winds 15 to 20 knots, increasing to 20 to 25 knots with gusts up to 35 knots after midnight. Seas 6 to 8 feet with a dominant period 7 seconds. Intracoastal waters rough.
Thursday..Northeast winds 20 to 25 knots, increasing to 25 to 30 knots in the afternoon. Seas 7 to 10 feet.
Thursday night..Northeast winds 25 to 30 knots, diminishing to 20 to 25 knots after midnight. Seas 8 to 11 feet. A slight chance of showers.
Friday..Northeast winds 20 to 25 knots. Seas 8 to 10 feet. A slight chance of showers.
Friday night..Northeast winds 15 to 20 knots. Seas 7 to 10 feet. A chance of showers.
winds and waves higher in and near Thunderstorms.

AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 720 Pm Est Sun Dec 10 2023
Synopsis..
a strong cold front will push across the waters around midnight bringing an abrupt shift and increase in winds. A brief period of gale force gusts will be possible with the initial wind shift and an hour or so afterward before decreasing to small craft advisory level conditions. High pressure will build from the west allowing winds to gradually subside as they shift northerly through Monday. That high pressure will build to the north and strengthen through the week, which will yield a prolonged period of strong northeast winds through the end of the week and into next weekend.

Gulf stream..
the approximate location of the west wall of the gulf stream as of dec 09, 2023 at 1200 utc...
50 nautical miles east of flagler beach. 53 nautical miles east of saint augustine beach. 61 nautical miles east of jacksonville beach. 78 nautical miles east of st simons island.
this data courtesy of the naval oceanographic office.


7 Day Forecast for Marine Location Near St. Simons, GA
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Area Discussion for - Jacksonville, FL
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FXUS62 KJAX 110611 AFDJAX

Area Forecast Discussion National Weather Service Jacksonville FL 111 AM EST Mon Dec 11 2023

New AVIATION

For the latest NE FL and SE GA Daily Key Messages please visit: https:// www.weather.gov/media/jax/briefings/nws-jax-briefing.pdf

AVIATION
(06Z TAFS)
Issued at 112 AM EST Mon Dec 11 2023

IFR ceilings will prevail at the regional terminals through around 08Z, with light showers lingering at CRG through 07Z and at SGJ through around 08Z. Ceilings will then quickly lift to MVFR between 08Z-09Z, with VFR conditions then expected to prevail at the regional terminals by 10Z. West-northwesterly surface winds will remain sustained around 10 knots overnight, with winds shifting to northwesterly and increasing to 10-15 knots by 13Z.
Surface winds will then shift to northerly at GNV, SGJ, and SSI towards 20Z and towards 00Z elsewhere. Winds are expected to subside to the 5-10 knot range towards sunset on Monday evening.

UPDATE
Issued at 635 PM EST Sun Dec 10 2023

The threat of severe weather has ended and the earlier tornado watch was cancelled. Pockets of moderate to heavy rain continue to push east and a few embedded and elevated storms are still possible south of Jacksonville along the NE FL coast for the next half hour or so.

Upstream, the cold front is progressing eastward across the FL panhandle and will reach our area late this evening then push offshore into the Atlantic by midnight. A strong initial bout of wind is expected with the frontal passage, with gusts in the 35-40 mph range. Though isolated gusts of 40+ mph will be possible, mainly at the immediate beaches, it will be so brief that a Wind Advisory is not necessary. A few more showers capable of moderate rain will also push through with the front as it passes.

Strong cold air advection will plummet temperatures overnight and low temps into the upper 30s from the Suwannee Valley northward across inland SE GA. Elsewhere, low to mid 40s are anticipated by sunrise Monday.

SHORT TERM
(Monday through Tuesday night)
Issued at 305 PM EST Sun Dec 10 2023

Building high pressure from the west will lead to dry conditions for the area during the start of the week. Onshore flow will lead to the advection of moisture over coastal locations resulting in the possibility of a few coastal showers. Daytime highs will mainly be in the upper 50s across the area with north central Florida reaching the lower 60s. Temperatures will hover just above freezing during the overnight hours into Tuesday. Lows for most of northeast Florida will dip to the low/mid 40s. Lows over the the Suwannee Valley Region in northeast Florida and northward towards southeast Georgia will see temperatures dip to the mid 30s. Come Tuesday, the dry conditions will continue with the addition of an increase in cloud cover as the day progresses. A bit warmer temperatures on Tuesday as Highs will be in the 60s with warmer temperatures over north central Florida.

LONG TERM
(Wednesday through next Sunday)
Issued at 305 PM EST Sun Dec 10 2023

The dry conditions are expected to continue at the start of the forecast period as high pressure remains to the north of the area. Precipitation chances increase on Friday, with the counties in north central Florida with the best chances of rain as moisture moves northward from central Florida . Precipitation chances will currently stay in the 30% to 40% range as guidance remain uncertain in the magnitude and the northward extent of instability and deep moisture. Daytime Highs will remain in the 60s during this period, with north central Florida counties getting into the lower 70s. Overnight Lows in southeast Georgia will be in the mid/upper 40s, whereas northeast Florida will have lows in the mid/upper 50s.

MARINE
Issued at 305 PM EST Sun Dec 10 2023

A strong cold front will cross the local waters this evening with solid Small Craft Advisory conditions in the Southwest flow ahead of the squall line of strong to isolated severe thunderstorms that will precede this front with stronger storms being capable of producing damaging wind gusts and waterspouts through early this evening. Outside of thunderstorm activity, westerly winds will increase towards sunset for the near shore waters, with winds then shifting to northwesterly and occasionally gusting to Gale Force after midnight both near shore and offshore, but will hold off on Gale Warning as most of the peak wind gusts over 35 knots will occur with pre-frontal convection.

High pressure will then build over the southeastern states in the wake of this cold frontal passage on Monday morning, allowing for gradually diminishing northerly winds and subsiding seas. This high pressure center will migrate northeastward and will strengthen over the coastal Carolinas on Tuesday, resulting in an extended period of strong northeasterly winds and steadily building seas that will persist into next weekend with Small Craft Advisory headlines re-developing. Coastal troughing developing over our near shore waters will likely develop showers by mid to late week that may persist into next weekend.

Rip Currents/Surf: Offshore flow on Monday will lead to Low Risk of Rip Currents, with a return to Moderate Risk of Rip currents on Tuesday as onshore flow develops, then High Risk likely from Wednesday well into next weekend as onshore flow increases and surf builds. Surf around 2 ft Monday will build to 2-4 ft on Tuesday, and 3-6 ft Wednesday, then into the 5-8 ft range by Thursday with High Surf Advisory headlines likely through the end of the week at least.

--------------------------------------------------------

PRELIMINARY POINT TEMPS/POPS
AMG 57 35 59 40 / 0 0 0 0 SSI 58 44 61 51 / 0 0 0 0 JAX 59 41 63 51 / 0 0 0 0 SGJ 59 49 67 59 / 0 0 0 0 GNV 59 40 66 51 / 0 0 0 0 OCF 60 41 67 54 / 0 0 0 0

JAX WATCHES/WARNINGS/ADVISORIES
FL...None.
GA...None.
AM...Small Craft Advisory until 10 AM EST this morning for AMZ450-452- 454-470-472-474.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesinHgDewPt
SAXG1 - Sapelo Island Reserve, GA 21 mi87 min NNW 9.9 29.86
KBMG1 25 mi69 min 53°F 29.89
41112 - Offshore Fernandina Beach, FL (132) 30 mi57 min 54°F 64°F4 ft
FRDF1 - 8720030 - Fernandina Beach, FL 32 mi69 min NW 5.1G11 53°F 64°F29.89
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 33 mi47 min NNW 18G23 55°F 64°F29.8654°F

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Wind History for Fernandina Beach, FL
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Airport Reports
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AirportDistAgeWind ktVisSkyWeatherTempDewPtRHinHg
KSSI ST SIMONS ISLAND,GA 1 sm12 minWNW 10G1610 smOvercast52°F52°F100%29.89
KBQK BRUNSWICK GOLDEN ISLES,GA 10 sm12 minW 0810 smOvercast50°F48°F94%29.90

Wind History from SSI
(wind in knots)


Tide / Current for St. Simons Light, Georgia
   
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St. Simons Light
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Sun -- 04:49 AM EST     Moonrise
Sun -- 06:06 AM EST     7.04 feet High Tide
Sun -- 07:13 AM EST     Sunrise
Sun -- 12:37 PM EST     0.67 feet Low Tide
Sun -- 03:30 PM EST     Moonset
Sun -- 05:23 PM EST     Sunset
Sun -- 06:18 PM EST     6.30 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

St. Simons Light, Georgia, Tide feet
12
am
0.5
1
am
1.1
2
am
2.4
3
am
4
4
am
5.5
5
am
6.6
6
am
7
7
am
6.8
8
am
5.9
9
am
4.6
10
am
3.2
11
am
1.8
12
pm
0.8
1
pm
0.7
2
pm
1.5
3
pm
2.9
4
pm
4.4
5
pm
5.6
6
pm
6.3
7
pm
6.1
8
pm
5.3
9
pm
4
10
pm
2.6
11
pm
1.3



Tide / Current for St. Johns River Entrance, Florida Current (3)
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St. Johns River Entrance
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Sun -- 02:27 AM EST     0.00 knots Slack
Sun -- 04:49 AM EST     Moonrise
Sun -- 05:32 AM EST     2.45 knots Max Flood
Sun -- 07:12 AM EST     Sunrise
Sun -- 08:46 AM EST     -0.00 knots Slack
Sun -- 11:21 AM EST     -1.73 knots Max Ebb
Sun -- 03:31 PM EST     Moonset
Sun -- 03:37 PM EST     0.00 knots Slack
Sun -- 05:24 PM EST     Sunset
Sun -- 05:56 PM EST     1.69 knots Max Flood
Sun -- 08:39 PM EST     -0.00 knots Slack
Sun -- 11:14 PM EST     -1.88 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

St. Johns River Entrance, Florida Current (3), knots
12
am
-1.3
1
am
-0.8
2
am
-0.3
3
am
0.4
4
am
1.5
5
am
2.3
6
am
2.4
7
am
1.8
8
am
0.9
9
am
-0.3
10
am
-1.3
11
am
-1.7
12
pm
-1.7
1
pm
-1.4
2
pm
-1
3
pm
-0.5
4
pm
0.4
5
pm
1.3
6
pm
1.7
7
pm
1.3
8
pm
0.6
9
pm
-0.4
10
pm
-1.4
11
pm
-1.9




Weather Map
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Jacksonville, FL,



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