Wednesday, January29, 2020
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Marine Weather and Tides
Dutch Island, GA

Version 3.4
NOTICE
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 7:18AMSunset 5:55PM Wednesday January 29, 2020 5:14 AM EST (10:14 UTC) Moonrise 10:16AMMoonset 10:20PM Illumination 19% Phase: Waxing Crescent; Moon at 4 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- 345 Am Est Wed Jan 29 2020
.small craft advisory in effect from late tonight through Thursday afternoon...
Today..NE winds 5 kt, increasing to 10 kt late. Seas 1 foot. A chance of rain this afternoon.
Tonight..NE winds 10 to 15 kt, increasing to 15 to 20 kt with gusts to 25 kt after midnight. Seas 2 ft, building to 3 to 4 ft after midnight. Rain.
Thu..NE winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 6 ft. A slight chance of rain.
Thu night..NE winds 20 kt with gusts to 25 kt. Seas 4 to 6 ft. A slight chance of rain in the evening, then a chance of rain after midnight.
Fri..NE winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Seas 4 to 5 ft, subsiding to 3 to 4 ft in the afternoon. Rain likely.
Fri night..NW winds 5 to 10 kt. Seas 3 to 4 ft. A chance of rain.
Sat..NW winds 10 to 15 kt. Seas 3 to 4 ft. A slight chance of showers.
Sat night..W winds 15 to 20 kt. Seas 3 to 4 ft.
Sun..W winds 15 to 20 kt. Seas 2 to 3 ft.
Sun night..W winds 10 to 15 kt. Seas 2 ft.
AMZ300 345 Am Est Wed Jan 29 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A storm system will impact the area late tonight into early Thursday, followed by another storm system Friday into early Saturday. High pressure is expected early next 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 290909 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 409 AM EST Wed Jan 29 2020

SYNOPSIS. A storm system will impact the area late tonight into early Thursday, followed by another storm system Friday into early Saturday. High pressure is expected early next week.

NEAR TERM /THROUGH TONIGHT/. Today: Aloft, shortwave ridging will ripple through in the morning ahead of an approaching southern stream shortwave trough. The trough and associated forcing just ahead of it will arrive starting in the late afternoon hours. At the surface, the trough will drive an area of low pressure eastward along the central and eastern coast of the Gulf of Mexico. Model soundings and time heights show increasing moisture arriving beginning in the mid to late morning hours, mostly in the form of top down moistening. Through much of the afternoon we will maintain some dry air in the 700-850 mb layer, which will take some time to erode. Overall, the model suite appears to handle this dry air well and keeps the bulk of the rainfall in the evening to early morning time period. Through sunset, the best rain chances will reside mainly along and south of I-16 where 50-60 percent rain are in place. For areas to the north of I-16, the expectation is for isolated to scattered light showers. We should see several hours of sun this morning before we go overcast late in the day. Highs are forecast to top out right around 60 across the entire forecast area.

Tonight: The main period of active weather will be in the evening through the early morning hours. The best combination of moisture and deep layer forcing for ascent will pass through during this time, spreading mainly light rainfall across the forecast area. The main forecast challenge is deciding how far north the rain shield will extend, which will have significant implications for rain chances. The forecast features 80-100 percent chances across most of southeast Georgia as well as Jasper and Beaufort counties. There is then a gradient to further north which diminishes to the 40-50 percent range around Lake Moultrie. In reality the rain gradient will likely be much tighter, but we certainly don't have enough confidence to attempt to be that exact at this time. During the early morning hours, the forcing and moisture will pass to the east and rain should come to a rather quick end. By sunrise, the forecast area should be dry. Forecast rainfall amounts range from 0.25-0.50 of an inch with the highest rain chances, with less than a tenth of an inch across the northern inland tier. Forecast lows range from the low 40s inland to near 50 at the coast.

SHORT TERM /THURSDAY THROUGH SATURDAY/. Thursday: A mid-level wave just offshore in the morning will move away while weak ridging moves in from the west, passing overhead during the first part of the night. The storm system will be offshore in the morning, pushed away by broad high pressure moving in from the north/west. Any remnant showers should be limited to the immediate coast early in the morning. These showers will move away/dissipate, setting the stage for a dry day and then evening. Overnight, troughing offshore will start to merge with a storm system approaching from the Gulf of Mexico. Moisture and lift are expected to increase, leading to light showers developing/overspreading the area from the south and east after midnight. Given the limited QPF potential, most areas are capped at slight chance POPs. Expect breezy conditions at the beaches during the day and night. Temperatures should be normal during the day and a few degrees above normal at night due to the increasing clouds.

Friday: The mid-levels will consist of a weak ridge over the East Coast in the morning. The ridge will get pushed offshore in the afternoon as a strengthening trough approaches from the west. The trough axis should be located just to our west overnight. At the surface, a coastal trough will continue to merge with a strengthening storm system originating from the Gulf of Mexico. Moisture and lift continue to increase into the afternoon, allowing precipitation to increase in coverage and intensity. With the good model agreement, POPs are in the likely category during the day. Though, they'll need to be raised more with future forecasts because the QPF is more than 0.25" in some locations. Temperatures should be limited to the 50s during the day. The storm system shifts offshore during the evening and overnight, causing the precipitation to decrease. Though, coverage on the back side of the system remains good enough to keep at least chance POPs for most of the night. Low temperatures will be a few degrees above normal.

Saturday: A trough axis located just to our west in the morning will move overhead by the afternoon. The main surface feature, the storm system, is expected to be offshore and moving away. However, the models disagree somewhat on what will happen in our area. They generally show some showers in the morning. They disagree on whether it will be a dry afternoon OR a second wave of showers develops near the Appalachians, then moves over our area, bringing minimal QPF. We followed the lead of our neighboring offices and went the dry forecast. But we wouldn't be surprised if POPs need to be raised in the afternoon with future forecasts. High temperatures should be within a few degrees of normal.

LONG TERM /SATURDAY NIGHT THROUGH TUESDAY/. High pressure will bring dry conditions Sunday and Monday. Temperatures are expected to be well above normal on Monday. A front approaches from the west on Tuesday, possibly bringing some showers to our inland locations. Though, temperatures should remain above normal on Tuesday.

AVIATION /09Z WEDNESDAY THROUGH SUNDAY/. VFR conditions will prevail through much of the 06z TAF period. This afternoon, an area of low pressure in the Gulf of Mexico will spread moisture and rainfall into much of the forecast area. This rain will last through the evening and should come to an end in the early morning hours. KSAV will almost certainly see a several hour period of rainfall with the potential for MVFR ceilings and visibilities. Further north, things are less certain at KCHS. It is quite likely that KCHS will receive rainfall, but confidence isn't high that sub-VFR conditions will extend that far north. Have timed the arrival of MVFR conditions into KSAV starting at 02z and kept KCHS VFR.

Extended Aviation Outlook: A storm system is expected to bring flight restrictions Friday into early Saturday.

MARINE. Today: Conditions will be fairly quiet today ahead of an approaching low pressure system moving across the Gulf of Mexico. Winds will mainly be out of the northeast or east with speeds increasing to around 10 knots by late this afternoon. Seas are expected to be 1-2 feet.

Tonight: The area of low pressure will move out of the Gulf of Mexico, cross the Florida peninsula, and emerge over the far western Atlantic. As it does, a northeast pressure gradient will tighten resulting in steadily increasing winds. By sunrise Thursday, wind speeds should be a solid 15-20 knots across all waters, with frequent gusts to 25 knots in the Georgia waters. Seas will increase quickly late, becoming 3-5 feet in the Georgia waters, 2-4 feet elsewhere. A Small Craft Advisory has been issued for the Georgia waters starting in the early morning hours and this may need to be expanded to other zones with later forecast issuances.

Thursday: A storm system offshore will move away while high pressure builds in from the north/west. Strong winds and elevated seas will be ongoing in the morning. Small Craft Advisories are in place for the GA waters during the day. Conditions start to improve during the evening. Though, it's borderline whether the advisory for the GA waters within 20 nm will expire as advertised or need to be extended further into the night. The advisory for the GA waters beyond 20 nm is expected to continue through the night due to winds and seas taking longer to drop.

Friday: Wind/wave conditions are expected to remain just below advisory levels as the next storm system approaches from the west. The system should pass offshore Friday night.

Weekend: The storm system will move away on Saturday while high pressure approaches from the west. The interaction between these two features will cause strong winds and elevated seas. Small Craft Advisories are expected for all of the Atlantic waters from Saturday night into Sunday.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory from 1 AM Thursday to 9 AM EST Friday for AMZ374. Small Craft Advisory from 1 AM to 6 PM EST Thursday for AMZ354.



NEAR TERM . BSH SHORT TERM . MS LONG TERM . MS AVIATION . BSH/MS MARINE . BSH/MS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi62 min NW 1.9 G 1.9 47°F 53°F1017.1 hPa
41033 38 mi66 min SSE 1.9 G 3.9 53°F 54°F1017.8 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 41 mi84 min E 1.9 G 1.9 57°F 57°F2 ft1016.5 hPa (-0.7)45°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 mi2.3 hrsN 010.00 miFair39°F36°F89%1016.6 hPa
Savannah-Hilton Head International Airport, GA15 mi81 minN 010.00 miFair40°F37°F89%1016.7 hPa
Hilton Head Island, Hilton Head Airport, SC23 mi79 minN 010.00 miFair39°F39°F100%1016.9 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrNW4NW4NW4N6N5N4W3CalmN6SE8S6SE6CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoW4W4NW4CalmNW4W6W8W9SW11W12W12W12W10W8W7W5--W6W6W8W7W5NW4NW4
2 days agoCalmCalmW5W7W8W10W6NW9W10W7
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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
Wed -- 04:46 AM EST     0.29 feet Low Tide
Wed -- 07:19 AM EST     Sunrise
Wed -- 10:15 AM EST     Moonrise
Wed -- 11:11 AM EST     7.23 feet High Tide
Wed -- 05:15 PM EST     0.23 feet Low Tide
Wed -- 05:54 PM EST     Sunset
Wed -- 10:20 PM EST     Moonset
Wed -- 11:27 PM EST     6.84 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.353.41.80.60.312.54.25.76.77.2764.42.71.10.30.51.73.34.96.16.8

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Wed -- 02:45 AM EST     -1.58 knots Max Ebb
Wed -- 06:00 AM EST     0.00 knots Slack
Wed -- 07:19 AM EST     Sunrise
Wed -- 08:29 AM EST     1.65 knots Max Flood
Wed -- 10:14 AM EST     Moonrise
Wed -- 12:14 PM EST     -0.00 knots Slack
Wed -- 03:15 PM EST     -1.67 knots Max Ebb
Wed -- 05:54 PM EST     Sunset
Wed -- 06:21 PM EST     0.00 knots Slack
Wed -- 08:52 PM EST     1.87 knots Max Flood
Wed -- 10:19 PM EST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.1-1-1.5-1.6-1.4-0.9-011.61.61.20.80.2-0.7-1.4-1.7-1.6-1.2-0.40.71.61.91.51

Weather Map
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wmap_A
GEOS Local Image of Southeast    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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (5,6,7,8)
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Ground Weather Radar Station Charleston, SC
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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.