Sunday, September19, 2021
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Marine Weather and Tides
Wilmington Island, GA

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:09AMSunset 7:25PM Sunday September 19, 2021 9:02 AM EDT (13:02 UTC) Moonrise 6:07PMMoonset 4:39AM Illumination 96% Phase: Waxing Gibbous; Moon at 13 days in cycle
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.
Marine Forecasts
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AMZ354 Waters From Savannah Ga To Altamaha Sound Ga Out 20 Nm, Including Grays Reef National Marine Sanctuary- 558 Am Edt Sun Sep 19 2021
Today..E winds 10 to 15 kt with gusts to 20 kt. Seas 2 to 3 ft. Scattered showers and tstms.
Tonight..E winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers and tstms in the evening, then showers likely with a slight chance of tstms after midnight.
Mon..E winds 10 to 15 kt with gusts to 20 kt. Seas 2 to 3 ft. Showers. A slight chance of tstms in the morning, then a chance of tstms in the afternoon.
Mon night..E winds 10 to 15 kt. Seas 2 to 3 ft. A chance of tstms. Showers.
Tue..SE winds 5 to 10 kt. Seas 2 to 3 ft. Showers. A slight chance of tstms in the morning, then a chance of tstms in the afternoon.
Tue night..SE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of tstms. Showers.
Wed..S winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with a chance of tstms.
Wed night..W winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Thu..NW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers.
Thu night..N winds 10 to 15 kt. Seas 3 to 4 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 558 Am Edt Sun Sep 19 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A wet weather pattern will prevail into the middle of the week. A cold front will move through the area Wednesday evening into early Thursday, followed by high pressure prevailing through the weekend.


7 Day Forecast for Marine Location Near Wilmington Island, GA
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Area Discussion for - Charleston, SC
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FXUS62 KCHS 190956 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 556 AM EDT Sun Sep 19 2021

SYNOPSIS. A wet weather pattern will prevail into the middle of the week. A cold front will move through the area Wednesday evening into early Thursday, followed by high pressure prevailing through the weekend.

NEAR TERM /THROUGH TONIGHT/. The forecast is on track and only required minor adjustments. Patchy fog was introduced in the Allendale to Reidsville corridor where surface observations are showing vsbys 2-5 miles with brief drops to less than 1 mile. The fog is likely shallow and vsbys at the various AWOS units are likely not representativeof true prevailing conditions. Otherwise, marine-based showers have developed as expected and will likely move onshore along the Georgia coast soon.

Today: Weak high pressure centered over the eastern Great Lakes will continue to nose into the region today. Despite pronounced H5 ridging aloft, a moist onshore flow and elevated PWATS will keep unsettled conditions in place today, mainly across Southeast Georgia into far southern South Carolina. Isolated to scattered showers and possibly a tstm or two are expected to develop along the Georgia coast near or shortly after daybreak with activity expanding/developing farther west with time as instability slowly increases. The greatest coverage of showers/tstms are expected to occur across Southeast Georgia this afternoon where PWATS are forecast to remain near 2 inches and low-level convergence could become enhanced by a weak sea breeze circulation. Pops will range from around 10% near the Santee River to 50% roughly along/south of the I-16 corridor, including the Savannah Metro Area. Highs are expected to peak in the upper 80s near the CSRA and Southern Midlands to the lower 80s at the beaches. If convection fires earlier or becomes more widespread than expected, highs south of the I-16 corridor could end up being a category too high.

Tonight: A well defined H9-H7 confluence moisture axis extending from Tennessee southeast into Florida will slowly propagate northeast into Southeast Georgia by daybreak Monday as a H5 trough across the lower Mississippi Valley nudges east. Although convection may wane a bit after sunset as instability diminishes with the loss of insolation, convection is expected to increase in coverage by late evening and especially overnight as forcing for assent begins to intensify and H8-H7 moisture transport rapidly strengthens. By daybreak Tuesday, mean RH throughout the lower Troposphere should average >90% across Southeast Georgia. This coupled with some instability advecting inland from off the warmer Atlantic and additional low-level convergence associated with the formation of a weak coastal trough along the coast will likely support a large band of showers with few tstms across much of Southeast Georgia and possibly into far southern South Carolina. This activity could pose a risk for urban flooding in the Savannah Metro Area as PWATs climb to 2.20-2.35 inches and will have to be closely watched. Overnight pops will range from 20-30% across the Charleston Tri- County area to 60-80% across Southeast Georgia, highest along the Georgia coast. Lows will range from the lower 70s inland to the upper 70s along the beaches.

SHORT TERM /MONDAY THROUGH WEDNESDAY/. Monday and Tuesday: Aloft, a broad ridge will extend across the Southeast United States while a mid-upper lvl low shifts north along its western edge across the Midwest and Great Lakes region. At the sfc, high pressure strengthening and extending south along the East Coast will set up a fairly strong onshore flow across the local area, reinforcing deep moisture with PWATs approaching 2.25-2.50 inches Monday and Tuesday. Given ample moisture in place and subtle mid-lvl energy drifting across the area aloft, numerous to widespread showers along with few/scattered thunderstorms will be possible each day with peak precip coverage anticipated late morning into early evening hours across southeast Georgia Monday, before the bulk of activity drifts north into southeast South Carolina Tuesday while enhanced moisture convergence occurs with a developing coastal trough along the Southeast Coast. At this time, convective activity is expected to remain sub-severe, although many locations could experience heavy downpours from showers/thunderstorms each day. Should the bulk of rains occur closer to the coast around the evening high tides, minor flooding issues are possible. Flood Advisories could eventually be needed.

Extensive cloud cover each day should limit overall heating potential. Highs should be near or a few degrees below normal, generally peaking in the low-mid 80s each afternoon. Overnight lows should remain mild, generally ranging in the low-mid 70s away from the immediate coast.

Wednesday: High pressure extending south along the East Coast is expected to weaken considerably as a coastal trough shifts north across the Carolinas early in advance of a mid-lvl trough shifting across the Midwest toward the Northeast and Mid-Atlantic region. Scattered to numerous showers along with a few thunderstorms should shift north with the coastal trough, before another round of showers and thunderstorms develop during the afternoon as the area remains somewhat warm-sectored and moist in advance of a cold front approaching the region late day into the evening. A few stronger and/or perhaps severe thunderstorms can not be ruled out late day, especially if the front arrives by early evening. Regardless, convective activity could produce heavy downpours while PWAT values around 2.0 inches remain across the area ahead of fropa. High temps should generally range in the low-mid 80s, warmest across southeast Georgia.

LONG TERM /WEDNESDAY NIGHT THROUGH SATURDAY/. A cold front associated with the high amplitude trough is expected to shift through the area by early Thursday, likely bringing an end to a wet pattern as drier and cooler high pressure spreads across the Southeast into early next weekend. Along the front, deep moisture characterized by PWATs around 2.0 inches will support at least chances of showers/thunderstorms Wednesday night, some potentially strong before shifting offshore. Once fropa occurs, conditions will be noticeably drier and cooler with high pressure dominating the pattern and a northerly wind in place through next weekend. High temps should average in the upper 70s to lower 80s Thursday to Saturday, then gradually warm a degree or two Sunday. Low temps in the mid-upper 60s Wednesday night should dip into the mid-upper 50s away from the coast during the weekend.

AVIATION /10Z SUNDAY THROUGH THURSDAY/. KCHS/KJZI: There are no concerns with VFR prevailing for much of the 12z TAF cycle. An isolated shower/tstm could pop up along the sea breeze near both terminals by mid-afternoon, especially at KCHS, but chances are too low to justify a mention at this time.

KSAV: The chances for tstm/shower impacts will increase by mid- afternoon, but there are still some timing and coverage issues noted in the various high-res guidance. VCTS 19-22z will be maintained to account for possible impacts. The need for a TEMPO ground will be reassessed for the 18z TAF cycle, if not sooner. Steadier showers will likely overspread the KSAV terminal after 08z. Prevailing MVFR vsbys and cigs will be highlighted in -SHRA . There is a risk for a tstm here, but no mention of TSRA will be included for the early morning Monday.

Extended Aviation Outlook: Periods of flight restrictions are possible at all terminals Monday into Wednesday due to showers and thunderstorms across the region. A cold front will then shift through the region Wednesday night into early Thursday, bringing another round of flight restrictions across the area. VFR conditions should then prevail at all terminals after daybreak Thursday.

MARINE. Through Tonight: An easterly wind regime will hold in place through tonight as high pressure holds to the north. Winds will increase to 15-20 kt through the day, possibly just a few knots lower across the Georgia waters, as the pressure gradient tightens over the local marine area. These elevated winds will linger through tonight, especially across the South Carolina waters. Seas will average 2-4 ft.

Monday through Friday: High pressure will become reinforced by stronger high pressure building south along the East Coast Monday into Tuesday. While this process unfolds, a coastal trough will attempt to develop off the Southeast Coast Tuesday, before shifting north of the area well in advance of a cold front approaching the region late Wednesday into early Thursday. Given the setup, the pressure gradient will be somewhat enhanced initially with 15-20 kt easterly winds across local waters and seas averaging between 2-4 ft. Winds should then veer more south Wednesday before a cold front shifts through the region Wednesday evening into early Thursday. Strong cold air advection in wake of the front could push northerly winds upwards to 20-25 kt and build seas up to 4-6 ft, leading to a period of Small Craft Advisories across local waters Thursday night into Friday.

Rip Currents: Modest onshore winds coupled with a 2 ft swell with 8-10 second periods generated by Odette over the past few days will support a moderate risk for rip currents at all beaches today. The moderate risk will linger into Monday.

TIDES/COASTAL FLOODING. Shallow coastal flooding is possible along the coasts of Charleston and Colleton Counties with the evening high tide. A Coastal Flood Advisory could be needed. Coastal flooding is not expected along the Georgia and far southern South Carolina coasts as tides at Fort Pulaski are expected to remain below 9.5 ft MLLW. The risk for minor coastal flooding will linger through at least mid-week.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . None.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 6 mi45 min 82°F1018.4 hPa
41033 37 mi55 min ENE 12 G 21 81°F 83°F1017.5 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 42 mi73 min NE 12 G 14 79°F 83°F2 ft1016.6 hPa (+1.1)
SAXG1 - Sapelo Island Reserve, GA 43 mi63 min WNW 1.9 79°F 1018 hPa (+2.0)79°F
ACXS1 - ACE Basin Reserve, SC 48 mi78 min Calm 74°F 1019 hPa74°F

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hunter U. S. Army Airfield, GA8 mi67 minNNE 310.00 miFair76°F73°F91%1017.5 hPa
Savannah-Hilton Head International Airport, GA14 mi70 minNNE 59.00 miPartly Cloudy75°F74°F96%1018.3 hPa
Hilton Head Island, Hilton Head Airport, SC22 mi73 minNE 710.00 miMostly Cloudy79°F75°F89%1018.6 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrCalm6NE3CalmE4E5CalmCalmSE5E4SE4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE3
1 day agoCalmCalmCalmCalmNE3E3SE6SE4CalmE3E3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE3NE6Calm
2 days agoCalmNE3CalmNE3E4NW3W3CalmCalmN3CalmCalmNE3N3CalmCalmCalmCalmS5CalmCalmN3CalmCalm

Tide / Current Tables for Savannah Sheraton Resort Hotel, Wilmington River, Georgia
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Savannah Sheraton Resort Hotel
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Sun -- 01:41 AM EDT     0.25 feet Low Tide
Sun -- 05:38 AM EDT     Moonset
Sun -- 07:10 AM EDT     Sunrise
Sun -- 07:43 AM EDT     8.49 feet High Tide
Sun -- 01:55 PM EDT     0.23 feet Low Tide
Sun -- 07:06 PM EDT     Moonrise
Sun -- 07:24 PM EDT     Sunset
Sun -- 08:16 PM EDT     9.20 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.10.60.31.33.15.27.18.28.47.76.34.42.40.80.20.92.54.76.88.49.28.97.86

Tide / Current Tables for Savannah River Entrance, Georgia Current (2) (expired 1999-12-31)
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Savannah River Entrance
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Sun -- 03:09 AM EDT     0.00 knots Slack
Sun -- 05:31 AM EDT     1.42 knots Max Flood
Sun -- 05:38 AM EDT     Moonset
Sun -- 07:09 AM EDT     Sunrise
Sun -- 08:40 AM EDT     -0.00 knots Slack
Sun -- 12:01 PM EDT     -2.59 knots Max Ebb
Sun -- 03:22 PM EDT     0.00 knots Slack
Sun -- 05:49 PM EDT     1.61 knots Max Flood
Sun -- 07:06 PM EDT     Moonrise
Sun -- 07:23 PM EDT     Sunset
Sun -- 09:04 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-2.7-2.2-1.3-0.20.81.41.41.10.6-0.3-1.4-2.3-2.6-2.3-1.6-0.40.71.41.61.40.90.1-1-2.1

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