Friday, January22, 2021
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Marine Weather and Tides
Dutch Island, GA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:21AMSunset 5:50PM Friday January 22, 2021 9:57 AM EST (14:57 UTC) Moonrise 12:59PMMoonset 1:58AM Illumination 68% Phase: Waxing Gibbous; Moon at 9 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- 628 Am Est Fri Jan 22 2021
Today..NW winds 5 to 10 kt, becoming N late this morning. Seas 2 ft this morning, then seas 1 foot. Patchy fog this morning. Rain.
Tonight..N winds 5 to 10 kt. Seas 1 foot. A chance of rain in the evening.
Sat..N winds 10 to 15 kt, becoming ne 15 to 20 kt in the afternoon. Seas 2 to 3 ft, building to 3 to 4 ft in the afternoon.
Sat night..NE winds 15 kt with gusts to 20 kt. Seas 3 to 4 ft, subsiding to 2 to 3 ft after midnight.
Sun..E winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers.
Sun night..SE winds 5 to 10 kt, becoming S after midnight. Seas 2 to 3 ft.
Mon..S winds 10 to 15 kt. Seas 3 to 4 ft.
Mon night..SW winds 15 to 20 kt. Seas 3 to 4 ft.
Tue..W winds 10 to 15 kt. Seas 3 to 4 ft. A slight chance of showers.
Tue night..N winds 10 to 15 kt. Seas 2 ft.
AMZ300 628 Am Est Fri Jan 22 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will slowly push south of the area today. High pressure will then prevail over the weekend, before another cold front crosses the area early next week. Another storm system could impact the region mid to late week.


7 Day Forecast for Marine Location Near Dutch Island, GA
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location: 31.98, -81.01     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 221159 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 659 AM EST Fri Jan 22 2021

SYNOPSIS. A cold front will slowly push south of the area today. High pressure will then prevail over the weekend, before another cold front crosses the area early next week. Another storm system could impact the region mid to late week.

NEAR TERM /THROUGH TONIGHT/. As of 655 AM: KCLX detected widespread light returns across the forecast area. The coverage is expected to remain widespread for the rest of the morning, then coverage will decrease from the north this afternoon. Temperatures should remain nearly steady in the low to mid 50s for most of the day.

As of 330 AM: Near term guidance indicates that a cold front will sink slowly south across southern GA through the day. The core of a 140+ knot jet will push off the mid-Atlantic coast later today. Much of the region will remain under the right entrance region of the jet today. High res guidance indicates that a frontal wave will organize along the GA/FL line, tracking E along the front this afternoon and evening. LLVL omega and frontogenesis should increase across the forecast area as the wave develops during the daylight hours. The combination of PW of 1-1.25 inches, deepening forcing, and the southern passage of the frontal wave, areas to widespread rain is expected to remain for most of the day, especially across SE GA. Late this afternoon into early this evening, rainfall is expected to end across inland SC, with rates decreasing steadily across GA. Rainfall amounts are forecast to range between .6 to .8 of an inch between the Savannah and Altamaha Rivers, rainfall amounts will trend lower north, with a quarter to one tenth of rain across the CHS Tri-County. Temperatures will be limited the rainfall and thick cloud cover, highs should favor values in the upper 50s.

Tonight: The cold front should surge southward with the passage of the wave. In the wake of the front, dry air will build south across the CWA. Lingering showers may continue over SE GA and adjacent waters this evening, with dry conditions forecast for the rest of the night. Cloud cover appears slow to decrease from north to south tonight, but should become partly cloudy during the pre-dawn hours. Given the slow decrease in cloud cover and weak H85 CAA, low temperatures are forecast to favor values in the low 40s, with upper 30s inland.

SHORT TERM /SATURDAY THROUGH MONDAY/. Surface high pressure will build into the region from the north on Saturday, providing cool and dry conditions. Expect plenty of sunshine with highs in the mid to upper 50s across most locations. Lows Saturday night will range from the mid 30s inland to low/mid 40s at the immediate coast.

High pressure will transition into the Atlantic on Sunday as a coastal trough takes shape offshore. Increasing moisture and isentropic ascent will allow clouds to overspread the area, with possibly a few light showers as well, especially near the Georgia coast where low level convergence is enhanced. Highs are forecast to mainly be in the upper 50s to around 60. There are some models that hint that a wedge set-up could develop, and should this occur, there will likely be a larger temperature gradient than currently indicated.

A mid level shortwave and associated surface low will lift northeast out of the Southern Plains into the Mississippi River Valley Sunday night into Monday. As this occurs, a warm front will lift north through the area. The best forcing for ascent remains to the north and west, so much of the area is expected to remain void of precipitation. We have lowered PoPs accordingly and just kept 20-30% confined to those bordering areas. Perhaps more notably will be the warm temperatures. Highs are expected to peak in the low to mid 70s away from the beaches - this is 10+ degrees above late January normals.

LONG TERM /MONDAY NIGHT THROUGH THURSDAY/. Surface low pressure will track across the mid-Atlantic states on Tuesday, eventually dragging a cold front through the local area. Models are in fairly good agreement indicating precipitation associated with the front will largely decay as it enters and moves through. Capped PoPs in the slight chance (20%) range. High pressure will briefly rebuild thereafter, before another, more potent storm system impacts the region late in the period. Warmer temperatures Tuesday will return to more seasonable levels for mid to late week.

AVIATION /12Z FRIDAY THROUGH TUESDAY/. A complicated pattern will exist across the terminals through much of the 12Z TAF period. A backdoor cold front will slip slowly south across SE GA today. A weak area of low pressure will track along the front, yielding widespread rain across the terminals through much of the day, especially at KSAV. The timing and placement of restrictive ceilings will remain the primary challenge for the TAFs. Based on MOS and forecast soundings, it appears that KSAV will remain MVFR through daybreak, then IFR ceilings are forecast to develop during the early daylight hours, expected to lower to LIFR this evening. Fog/stratus could develop across KSAV late tonight. KCHS is expected to see periods of MVFR and VFR ceilings this morning. Through this afternoon and evening, ceilings should favor MVFR, improving to MVFR late this evening.

Extended Aviation Outlook: VFR is expected over the weekend. Flight restrictions possible, mainly in low clouds, early next week.

MARINE. Today and tonight: A cold front south of the marine zones will continue to slowly slide south today. Sfc high pressure is expected to build over the waters tonight in the wake of the front. Winds should remain from the north between 10-15 kts today and tonight. In addition, it is possible the patchy fog will develop this morning across the nearshore GA waters. Otherwise, steady rain is expected to linger for much of the day, ending during the evening hours. Wave heights are forecast to range between 1-2 ft.

Saturday through Wednesday: Elevated northeast winds expected on Saturday as high pressure builds from the north. Conditions could come close to Small Craft Advisory criteria for a short period, especially across the Charleston county waters. Winds will gradually improve through the weekend the high slides into the Atlantic. A cold front will approach from the west early next week with winds and seas expected to increase in advance of the system. Small Craft Advisories will be possible across portions of the waters.

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



NEAR TERM . NED SHORT TERM . ETM LONG TERM . ETM AVIATION . NED MARINE . NED


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi64 min N 4.1 G 4.1 52°F 52°F1015.8 hPa
41033 38 mi50 min N 5.8 G 7.8 52°F 54°F1015.2 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 41 mi68 min NNW 3.9 G 9.7 57°F 55°F1 ft1015.5 hPa (+1.9)57°F
SAXG1 - Sapelo Island Reserve, GA 42 mi58 min SE 1 59°F 1015 hPa (+1.0)58°F

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Savannah-Hilton Head International Airport, GA15 mi65 minN 310.00 miOvercast53°F50°F89%1015.6 hPa
Hilton Head Island, Hilton Head Airport, SC23 mi68 minN 02.50 miRain54°F52°F94%1015.6 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrS6SE8S8S6S5CalmS3S5S3SW3SW3S4SW3SW6SW6W4W5W6W6W6W11W14
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SW4CalmW5CalmCalmCalmW4CalmCalmCalmCalmCalmCalmW3NW3CalmCalmCalmS4W5
2 days agoW10SW6W6W8SW5S4SW6SW5SW6SW4CalmSW4SW6SW6SW4SW8W8W8W8W9W10NW11
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Tide / Current Tables for Savannah Sheraton Resort Hotel, Wilmington River, Georgia
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Savannah Sheraton Resort Hotel
Click for Map
Fri -- 01:57 AM EST     Moonset
Fri -- 02:54 AM EST     6.83 feet High Tide
Fri -- 07:22 AM EST     Sunrise
Fri -- 09:14 AM EST     1.46 feet Low Tide
Fri -- 12:58 PM EST     Moonrise
Fri -- 03:21 PM EST     6.14 feet High Tide
Fri -- 05:48 PM EST     Sunset
Fri -- 09:26 PM EST     0.73 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.25.56.56.86.45.34.12.91.91.51.62.33.44.55.56.165.242.71.50.80.81.6

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Fri -- 12:12 AM EST     1.84 knots Max Flood
Fri -- 01:57 AM EST     Moonset
Fri -- 03:50 AM EST     -0.00 knots Slack
Fri -- 06:54 AM EST     -1.45 knots Max Ebb
Fri -- 07:21 AM EST     Sunrise
Fri -- 10:19 AM EST     0.00 knots Slack
Fri -- 12:44 PM EST     1.35 knots Max Flood
Fri -- 12:57 PM EST     Moonrise
Fri -- 04:13 PM EST     -0.00 knots Slack
Fri -- 05:48 PM EST     Sunset
Fri -- 07:07 PM EST     -1.35 knots Max Ebb
Fri -- 10:20 PM EST     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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1.81.71.30.7-0.1-1-1.4-1.5-1.4-1.1-0.30.61.21.31.10.70.2-0.6-1.2-1.3-1.3-1.1-0.30.7

Weather Map
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wmap_A
GEOS Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.