Monday, July13, 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 6:26AMSunset 8:33PM Monday July 13, 2020 6:21 AM EDT (10:21 UTC) Moonrise 12:22AMMoonset 1:13PM Illumination 45% Phase: Third Quarter Moon; Moon at 23 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- 332 Am Edt Mon Jul 13 2020
Today..SW winds 5 to 10 kt, becoming S 10 to 15 kt late. Seas 2 to 3 ft. A slight chance of showers and tstms this afternoon.
Tonight..SW winds 10 to 15 kt. Seas 2 to 3 ft.
Tue..SW winds 5 to 10 kt, becoming S in the afternoon. Seas 2 to 3 ft. A slight chance of showers and tstms in the afternoon.
Tue night..SW winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms in the evening.
Wed..SW winds 5 kt, becoming se in the afternoon. Seas 2 ft. A slight chance of showers and tstms in the afternoon.
Wed night..SE winds 5 to 10 kt. Seas 2 ft.
Thu..SE winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Thu night..SE winds 5 to 10 kt. Seas 2 ft.
Fri..SE winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Fri night..SE winds 5 to 10 kt. Seas 2 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 332 Am Edt Mon Jul 13 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. An area of low pressure will remain across the area today. A weak cold front is then expected to shift across the region on Tuesday. High pressure will build over the region on Wednesday and persist into 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 130808 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 408 AM EDT Mon Jul 13 2020

SYNOPSIS. An area of low pressure will remain across the area today. A weak cold front is then expected to shift across the region on Tuesday. High pressure will build over the region on Wednesday and persist into early next week.

NEAR TERM /THROUGH TONIGHT/. An upper level trough over the area this morning will shift east today. A weak disturbance moving into the trough will bring a period of slightly cooler temperatures in the mid levels of the atmosphere this afternoon. Even though surface dewpoints will mix out some today, they won't mix out as much as yesterday and this combined with very warm temperatures and the bit of cooling aloft will all act to increase instability some, with afternoon CAPE values expected from 1500 J/KG across far inland GA up to 2000 to 2500 J/KG across portions of southeast South Carolina. Appears the cooling aloft will also weaken the cap a bit this afternoon, especially across the Charleston Tri-County area before it increases again by this evening. But will that be enough for convection to develop given only modest convergence along the sea breeze and only subtle lift from the upper level disturbance. Model blends and most mesoscale models are fairly bullish on precipitation chances this afternoon despite only subtle changes to the atmospheric conditions that had a hard time producing any showers yesterday. The 00Z GFS and 00Z ECMWF models imply and numerical guidance from the GFS, ECMWF, and NAM indicate very low POPS, mainly at or below 20 percent. So in order to maintain some consistency with previous forecast and neighboring offices, only lowered rain chances to lower end of chance category, with the highest along the sea breeze during the mid to late afternoon hours in southeast South Carolina. Gut feeling is that these POPs may still be a bit too high. Given instability, cannot rule out a thunderstorm capable of producing strong to marginally severe winds gusts. The slight mixing out of dewpoints will once again keep heat indices in check with peak values expected to be between 100 and 105. Interesting that despite an upper level trough over the area, high temperatures will still be above normal, with highs ranging from near 90 at the coast to mainly mid 90s elsewhere.

Any lingering showers and thunderstorms should quickly weaken/dissipate this evening with the loss of heating. The majority of the night will be rain free. Warm lows will mainly be in the mid to upper 70s.

SHORT TERM /TUESDAY THROUGH THURSDAY/.

Tuesday: The center of a mid/upper lvl trough of low pressure will shift off the Northeast coast, helping nudge a southward extending cold front into the area. Lingering moisture near the weakening front could lead to few/scattered showers and thunderstorms during peak heating hours. Temps will be warm, peaking in the low/mid 90s for most areas (warmest across inland Georgia). Any convection that develops during the day will likely dissipate quickly during the evening, favoring dry conditions through the night. Temps will remain mild overnight, only dipping into the mid/upper 70s.

Wednesday and Thursday: A mid/upper lvl ridge of high pressure will extend across much of the Deep South and Southeast United States, favoring more of a typical summertime pattern as a weak front dissipates across/near the area Wednesday, before high pressure develops across the western Atlantic and a weak lee trough begins to develop inland Thursday. Few to scattered showers and thunderstorms are possible during peak heating hours each day, but should quickly diminish each evening with the loss of daytime heating. Temps will remain warm, peaking in the low/mid 90s across most areas each afternoon. A few locations could peak in the upper 90s well inland. Overnight lows should be mild, ranging in the mid/upper 70s away from the immediate coast.

LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/. A mid/upper level ridge of high pressure will extend across the Southeast through much of the week with the bulk of shortwave energy passing north of the area with a series of longwave troughs. A more typical summertime pattern is anticipated with few to scattered showers/thunderstorms possible each afternoon/evening through Friday. Precip coverage should slightly increase late weekend as weak h5 shortwave energy enters the area while onshore sfc flow persists between high pressure extending across the western Atlantic and lee trough inland. High temps will be a few degrees above normal through the week, generally ranging in low/mid 90s each day (warmest inland), but could be a degree or two cooler late week and into early next week as onshore sfc flow remains in place and precip coverage increases. Overnight lows should remain mild, ranging in the mid/upper 70s away from the immediate coast.

AVIATION /07Z MONDAY THROUGH FRIDAY/. VFR expected through 06Z Tuesday. There could be a few showers/thunderstorms near or perhaps at the terminals as early as 19-20Z Monday, but certainly not enough of a chance or confidence to include in either the KCHS or KSAV TAF this far in advance.

Extended Aviation Outlook: VFR conditions will generally prevail at both terminals through late week, but brief flight restrictions are possible during afternoon/evening showers or thunderstorms each day.

MARINE. Atlantic high pressure will result in south to southwest winds today and tonight. Winds will mainly be from 10 to 15 today and the first half of tonight before weakening. Seas will trend slightly higher today before trending lower tonight. Winds and seas will remain well below small craft advisory thresholds through tonight.

Tuesday through Saturday: A weak cold front could shift offshore Tuesday, but will likely be weakening and/or dissipating through Wednesday. High pressure will then generally prevail into the weekend. Given the weak pressure gradient pattern, winds/seas are expected to remain well below Small Craft Advisory levels through the week. In general, south-southeast winds will gust no higher than 10-15 kt, but could temporarily shift to the south-southwest during any weak fropa Tuesday. Seas will be no higher than 2-3 ft.

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

NEAR TERM . MTE SHORT TERM . DPB LONG TERM . DPB AVIATION . DPB/MTE MARINE . DPB/MTE


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi52 min SW 4.1 G 5.1 82°F 84°F1010.6 hPa
41033 38 mi74 min SW 9.7 G 18 84°F 84°F1009.7 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 41 mi32 min WSW 7.8 G 7.8 84°F 84°F3 ft1010.2 hPa (-0.0)73°F
SAXG1 - Sapelo Island Reserve, GA 42 mi82 min SW 6 80°F 1010 hPa (+0.0)73°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 mi26 minSSW 310.00 miFair78°F70°F78%1009.7 hPa
Savannah-Hilton Head International Airport, GA15 mi29 minWSW 410.00 miMostly Cloudy78°F71°F79%1010.2 hPa
Hilton Head Island, Hilton Head Airport, SC23 mi47 minSW 48.00 miFair82°F75°F79%1010.5 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrCalmCalmCalmS3S3W6NW6SW9W7SW5W6SW6SW8SW4SW4S5S6S5S6S4S4S5SW5S3
1 day agoW5W6W7NW4W4W5W8NW5W3CalmNW3NW5S10S7S3S6SW4SW3CalmCalmW3W4W3W5
2 days agoW3NW5N5NW4NW6NW7N4W5W4S6E6SE9S7S6S4S6S5SW7SW6CalmSW3SW3SW4W5

Tide / Current Tables for Savannah Sheraton Resort Hotel, Wilmington River, Georgia
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Savannah Sheraton Resort Hotel
Click for Map
Mon -- 01:21 AM EDT     Moonrise
Mon -- 02:59 AM EDT     6.87 feet High Tide
Mon -- 06:27 AM EDT     Sunrise
Mon -- 09:00 AM EDT     0.90 feet Low Tide
Mon -- 02:13 PM EDT     Moonset
Mon -- 03:26 PM EDT     7.27 feet High Tide
Mon -- 08:31 PM EDT     Sunset
Mon -- 09:33 PM EDT     1.78 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.55.66.56.96.45.33.92.41.30.91.32.33.75.26.57.27.16.353.72.61.91.82.4

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Mon -- 12:19 AM EDT     1.39 knots Max Flood
Mon -- 01:21 AM EDT     Moonrise
Mon -- 03:53 AM EDT     -0.00 knots Slack
Mon -- 06:27 AM EDT     Sunrise
Mon -- 06:39 AM EDT     -1.44 knots Max Ebb
Mon -- 10:00 AM EDT     0.00 knots Slack
Mon -- 12:40 PM EDT     1.83 knots Max Flood
Mon -- 02:12 PM EDT     Moonset
Mon -- 04:17 PM EDT     -0.00 knots Slack
Mon -- 06:56 PM EDT     -1.47 knots Max Ebb
Mon -- 08:31 PM EDT     Sunset
Mon -- 10:43 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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1.41.310.6-0.1-0.9-1.4-1.4-1.3-0.9-011.71.81.510.3-0.6-1.3-1.5-1.4-1.2-0.60.3

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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (6,6,7,8)
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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.