Sunday, January24, 2021
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Marine Weather and Tides
Isle of Hope, 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 7:20AMSunset 5:51PM Sunday January 24, 2021 3:03 AM EST (08:03 UTC) Moonrise 2:14PMMoonset 3:50AM Illumination 83% Phase: Waxing Gibbous; Moon at 11 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- 1204 Am Est Sun Jan 24 2021
Rest of tonight..NE winds 10 to 15 kt. Seas 3 to 4 ft.
Sun..NE winds 10 to 15 kt. Seas 3 to 4 ft, subsiding to 2 to 3 ft in the afternoon.
Sun night..E winds 5 to 10 kt, becoming se after midnight. Seas 2 to 3 ft.
Mon..S winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 to 3 ft, building to 3 to 4 ft in the afternoon. Patchy fog.
Mon night..SW winds 10 to 15 kt with gusts to 20 kt. Seas 3 to 4 ft. Patchy fog.
Tue..SW winds 10 to 15 kt. Seas 3 to 4 ft. A slight chance of showers. Patchy fog.
Tue night..SW winds 5 to 10 kt, becoming W after midnight. Seas 2 to 3 ft. A chance of showers with a slight chance of tstms.
Wed..NE winds 5 to 10 kt. Seas 2 ft. Showers likely with a slight chance of tstms.
Wed night..SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers.
Thu..NW winds 15 to 20 kt. Seas 3 to 4 ft.
Thu night..N winds 15 to 20 kt. Seas 3 to 4 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 1204 Am Est Sun Jan 24 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail through Monday. A cold front will impact the region Tuesday, followed by another storm system by mid week. High pressure will return late week.


7 Day Forecast for Marine Location Near Isle of Hope, GA
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location: 31.98, -81.05     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 240522 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1222 AM EST Sun Jan 24 2021

SYNOPSIS. High pressure will prevail through Monday. A cold front will impact the region Tuesday, followed by another storm system by mid week. High pressure will return late week.

NEAR TERM /UNTIL 6 AM THIS MORNING/. As of 1220 AM: Latest IR satellite indicated a large area of mid-level clouds arriving from the west. Based on satellite trends, the forecast will be updated to indicate partly to mostly cloudy conditions developing over the next hour and remaining through daybreak. Temperatures may cool by 3-5 degrees through the rest of the night.

Previous Discussion: Late this evening: No change to the going forecast. Previous discussion continues below.

Early this evening: High pressure situated to the north will continue to build into the lee of the Appalachians through tonight. The forecast is dry, but we will start to see clouds increase in coverage from the south late tonight as moisture increases and weak isentropic ascent develops. The main forecast challenge through sunrise will be temperatures. Before clouds increase later tonight, temperatures will likely fall quickly through the evening under relatively clear skies. This means lows could occur early in the period then hold steady or rise late, especially for southeast Georgia where the bulk of the cloud cover is expected. For southeast South Carolina lows are forecast in the low to mid 30s and we should see a typical diurnal overnight curve there.

SHORT TERM /6 AM THIS MORNING THROUGH TUESDAY/. Sunday and Monday: A fairly zonal pattern will remain in place across the Southeast U.S. Sunday with subtropical ridging forecast to build into Monday ahead of a powerful storm system that will take shape across the Southern Plains. This pattern will favor a continuation of quiet conditions as high pressure centered over the Ohio Valley slowly drops southeast and eventually offshore of the Southeast coast. Low-level moisture will begin to increase Sunday night into Monday as trajectories return to a more southerly component. While guidance tends to too aggressive in the development of marine-based shower activity in these types of flow regimes, a few showers could approach mainly the lower South Carolina coast prior to daybreak Monday. A warm front is forecast to sharpen across the South Carolina Midlands and Pee Dee during the day Monday. Isentropic ascent/warm air advection will slowly intensify in the vicinity of this feature as low-level jetting steadily ramps up during the day. This could support isolated to perhaps scattered shower activity across parts of the Charleston Tri-County to as far west as Walterboro, Hampton, and Allendale. Pops 20-30% look reasonable during this time. Will have to watch for possible sea fog brushing the immediate coast Monday afternoon and evening, but widespread coverage is not expected as low-level winds should veer more to the southwest Tuesday morning keeping any fog over the coastal waters. Highs will warm into the into the upper 50s/lower 60s Sunday then ramp up into the lower-mid 70s as warm air advection takes hold. Lows Monday morning will only drop into the upper 40s to mid 50s, warmest along the beaches.

Tuesday: The region will become fully entrenched in the warm sector ahead of an approaching cold front. While most of the morning may prove to be dry as the corridor of strongest isentropic ascent lifts to the north with a warm front, rain chances should begin to increase from west during the afternoon as the front moves into the South Carolina Midlands and over central Georgia. Pops will be limited to 20-40% at this time as the best rain chances look to hold off until Tuesday night into Wednesday as the front settles in. Highs will warm into the mid- upper 70s for many areas (~20deg above normal for late January) as H8 temperatures peak 13-14C.

LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/. Active weather pattern in store for mid week. A potent mid level shortwave and associated surface reflection will track across the eastern CONUS Wednesday into Thursday. While there are still discrepancies between models regarding placement and strength of the low, the set-up appears favorable for a decent rainfall event. Drier and cooler conditions expected late week behind this system as high pressure returns.

AVIATION /05Z SUNDAY THROUGH THURSDAY/. VFR conditions expected at KCHS and KSAV through 06z Monday.

Extended Aviation Outlook: VFR is expected over the weekend. Flight restrictions possible in low clouds and showers early to mid week.

MARINE. Tonight: High pressure centered across the Midwest will eventually become centered across the Mid-Atlantic states late, favoring a modest pressure gradient along its southern edge across the local waters tonight. In general, north- northeast winds gusting up to 15-20 kt are likely this evening, before slightly diminishing late. Seas will slowly build to 3-5 ft this evening (highest across offshore Georgia waters), then gradually subside late.

Sunday through Thursday: Northeast/east winds on Sunday will veer to the south on Monday following the passage of a warm front. Winds and seas will then increase Monday night and Tuesday ahead of an approaching cold front, and Small Craft Advisories will be possible for portions of the waters. There will be a risk for sea fog during this time, mainly Monday afternoon into Tuesday as increasing dewpoints/warming temperatures advect over the chilly shelf waters that are in place within 20 NM of the coast. Improvement is expected for mid week, although it will be short-lived as conditions deteriorate Thursday behind a departing low pressure system. Another round of advisories are likely.

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



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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 9 mi45 min NE 13 G 18 50°F 53°F1024.1 hPa
41033 40 mi55 min ENE 18 G 21 51°F 55°F1023.9 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 41 mi73 min NE 16 G 18 57°F 56°F4 ft1022.3 hPa (-0.6)45°F
SAXG1 - Sapelo Island Reserve, GA 41 mi63 min NE 9.9 54°F 1022 hPa (-1.0)42°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, GA14 mi70 minENE 910.00 miOvercast48°F36°F63%1023.6 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 Isle of Hope, Skidaway River, Georgia
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Isle of Hope
Click for Map
Sun -- 03:50 AM EST     Moonset
Sun -- 05:17 AM EST     7.19 feet High Tide
Sun -- 07:21 AM EST     Sunrise
Sun -- 11:29 AM EST     1.09 feet Low Tide
Sun -- 02:13 PM EST     Moonrise
Sun -- 05:45 PM EST     6.24 feet High Tide
Sun -- 05:51 PM EST     Sunset
Sun -- 11:33 PM EST     0.31 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.22.445.56.67.276.14.83.321.21.21.82.94.25.36.16.25.64.531.50.5

Tide / Current Tables for Savannah River Entrance, Georgia Current (2) (expired 1999-12-31)
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Savannah River Entrance
Click for Map
Sun -- 02:13 AM EST     1.23 knots Max Flood
Sun -- 03:49 AM EST     Moonset
Sun -- 05:29 AM EST     -0.00 knots Slack
Sun -- 07:21 AM EST     Sunrise
Sun -- 09:12 AM EST     -2.11 knots Max Ebb
Sun -- 12:51 PM EST     0.00 knots Slack
Sun -- 02:12 PM EST     Moonrise
Sun -- 02:43 PM EST     0.83 knots Max Flood
Sun -- 05:27 PM EST     -0.00 knots Slack
Sun -- 05:50 PM EST     Sunset
Sun -- 09:24 PM EST     -1.96 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.10.81.21.10.70.3-0.3-1.1-1.8-2.1-2-1.5-0.70.10.70.80.50.2-0.2-0.8-1.5-1.9-1.9-1.4

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.