Tuesday, October27, 2020
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L-36.com

Marine Weather and Tides
Savannah, 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 7:36AMSunset 6:40PM Tuesday October 27, 2020 11:43 AM EDT (15:43 UTC) Moonrise 4:03PMMoonset 2:57AM 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- 956 Am Edt Tue Oct 27 2020
Today..NE winds 10 to 15 kt. Seas 2 to 3 ft.
Tonight..E winds 10 kt early, diminishing to 5 to 10 kt. Seas 2 ft.
Wed..E winds 10 kt. Seas 2 to 3 ft.
Wed night..SE winds 10 to 15 kt. Seas 2 to 3 ft.
Thu..S winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft. A slight chance of showers.
Thu night..SW winds 20 to 25 kt with gusts to 30 kt. Seas 4 to 5 ft. A chance of showers with a slight chance of tstms.
Fri..NW winds 20 to 25 kt. Seas 3 to 4 ft.
Fri night..NE winds 20 to 25 kt. Seas 4 to 6 ft.
Sat..NE winds 20 kt. Seas 5 to 7 ft. A slight chance of showers.
Sat night..NE winds 15 to 20 kt. Seas 5 to 7 ft. A chance of showers. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 956 Am Edt Tue Oct 27 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will linger through the middle of the week. A storm system will bring impacts to the region Thursday, followed by high pressure Friday into the weekend.


7 Day Forecast for Marine Location Near Savannah, GA
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location: 32, -81.15     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 271412 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1012 AM EDT Tue Oct 27 2020

SYNOPSIS. High pressure will linger through the middle of the week. A storm system will bring impacts to the region Thursday, followed by high pressure Friday into the weekend.

NEAR TERM /THROUGH TONIGHT/. As of 10 AM: Visible satellite indicated a large band of stratus across the inland counties. In addition, a few patches of stratus and mid clouds have developed along the coast over the past hours. The observed KCHS sounding indicated a very shallow layer of moisture within the boundary layer. Forecast soundings indicated that the llvl moisture will mix by mid day. The forecast update will contain greater sky cover through the rest of this morning, then decreasing early this afternoon.

Previous Discussion: Today: No major changes with the latest forecast Moderate to high confidence this period. Biggest forecast challenge is determining the extent/timing of stratus/fog this morning. Latest satellite imagery indicates widespread stratus retreating mostly inland over the last few hours with a bit of fog well inland where ceilings are lowest and farther east toward the coast where clouds have mostly cleared allowing for better radiational cooling. Could see inland stratus try to shift back southeast a bit as low-level northerly winds increase a bit but should see a quick improvement after sunrise, especially eastern areas. Later today there should be a good amount of sun except possibly close to the Altamaha River in GA where the low- level flow will be more onshore. Could even see a few light showers/sprinkles in this area as suggested by the high- res model guidance but think the chances of measurable precipitation are too low to mention. Highs should get well above normal, near 80 northern/coastal areas to lower 80s elsewhere, warmest in GA.

Tonight: Moderate to high confidence this period. High pressure will prevail across most areas, especially in SC. Might see a few light showers late close to the CSRA as deeper moisture and upper forcing increase as tropical cyclone Zeta nears the north-central Gulf Coast. Lows should mostly range from the lower to mid 60s inland to lower 70s near the coast, still above normal for this time of year.

SHORT TERM /WEDNESDAY THROUGH FRIDAY/. Wednesday: The mid-levels will consist of high pressure located off the Southeast coast in the morning and a strong trough/low over the Southern Plains. The high will move further offshore with time while the trough/low approaches. This will lead to southwest flow overhead. At the surface, weak high pressure located to our northeast in the morning will move further offshore and weaken with time. Meanwhile, Hurricane Zeta will make landfall along the Lower MS Valley in the evening. This storm will merge with a separate, larger storm system in the same region. This newly merged storm will shift to the northeast. Moisture associated with both of these systems will continue to increase across our area with time as PWATs exceed 1.5". Despite all of this moisture, the best lift and rainfall potential should remain to our west, just outside of our area. Though, some isolated light showers are possible, so we generally have slight chance POPs west of I-95, during the afternoon and into the night. QPF should be limited, if any. Temperatures will be well above normal, especially at night.

Thursday: A strong mid-level trough and embedded low will be over the Southern Plains in the morning. They will move eastward with time, passing over our region late at night. A large storm system at the surface is forecasted to overspread most of the eastern half of the country. The bulk of the energy with this system is forecasted to pass to our north during the afternoon and into the night. However, a cold front associated with this system will approach our area from the west during the day, then cross through our region during the evening, moving offshore after midnight. Lots of moisture originating from the Gulf of Mexico will be just ahead of the front. Some models hint at a narrow band of 2.25" PWATs crossing through our area in the evening, which is more typical of summer than late October. However, the strongest lift will be to our north and this is why there are indications the front will be in a weakening phase as it moves through. The result will be much less rainfall than PWATs would suggest. We only have chance POPs in the evening with total rainfall ~0.1". Instability isn't too great either, so we only have a slight chance of thunder. The biggest concern may actually be gusty winds ahead of, with, and just behind the front. If there's intense mixing, we could need a Lake Wind Advisory for Moultrie. Beyond that, drier air and clearing conditions are expected to move in from west after midnight. This will be the last day of 80 degree temperatures for our area this week, which could put some record high temperatures at risk of being broken.

Friday: A mid-level trough over the East Coast in the morning will shift offshore with time. At the surface, a cold front will be offshore in the morning and moving away. Meanwhile, strong high pressure will become located to our north with time. Drier air and subsidence associated with the periphery of this high will be building into our area from the west. The result will be sunny skies. Cold air advection within northwest to north surface winds will lead to much colder temperatures. Highs will only be in the low to mid 70s, which is actually near normal for this time of year.

LONG TERM /FRIDAY NIGHT THROUGH MONDAY/. Zonal flow is expected to prevail in the mid-levels Saturday, followed by a long-wave trough over the East Coast Sunday into Monday. At the surface, high pressure passing to our north should bring dry conditions and below normal temperatures.

AVIATION /14Z TUESDAY THROUGH SATURDAY/. KCHS/KSAV: Moderate to high confidence for most of the 12Z/27 TAF period, with the lowest confidence regarding the extent of stratus/fog late tonight. High pressure will prevail with no rain expected through the period. However, abundant low-level moisture will lead to the potential for some restrictions early this morning and especially late tonight, possibly down to LIFR. Looks like the best chance of low cigs will be at KSAV while the best chance of low vsbys will be at KCHS where fog is more likely due to a bit less cloud cover.

Extended Aviation Outlook: A storm system will bring flight restrictions Thursday and Thursday night. Additionally, gusty winds are expected Thursday into Friday.

MARINE. Today/Tonight: High pressure will prevail with no significant concerns. However, there is a small risk that some fog could impact areas near the coast, including Charleston Harbor, early this morning and again late tonight.

Extended Marine: Weak high pressure will be located to our northeast Wednesday morning and moving away from our area. Additionally, Hurricane Zeta will make landfall along the Lower MS River Valley Wednesday night, then combine with a separate storm system. This new storm system will pass to our north on Thursday, with it's trailing front crossing through our area Thursday night. The surface pressure gradient will steepen with these features. The result will be rapidly increasing winds and building seas Thursday, so Small Craft Advisories will be needed for all of the waters, including the Charleston Harbor. The worst conditions are expected with frontal passage Thursday evening. Gusts could exceed Gale force across portions of the waters during that time period, along with steep, wind-driven seas. The front quickly moves offshore on Friday and high pressure builds in from the west, which will lead to a brief window of lower winds and seas in the afternoon hours. However, conditions should deteriorate again Friday night as cold air advection and the pressure gradient steepen again. These near gale conditions should persist through the weekend.

CLIMATE. Record warmth possible Thursday, October 29:

KCHS: 85/1946 and 72/1984

KCXM: 82/1984 and 72/1984

KSAV: 87/1996 and 71/2019

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



NEAR TERM . NED/RJB SHORT TERM . LONG TERM . AVIATION . RJB MARINE . RJB CLIMATE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 13 mi56 min ENE 8.9 G 11 73°F 75°F
SAXG1 - Sapelo Island Reserve, GA 41 mi44 min ENE 11 78°F 1021 hPa (+0.0)72°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 44 mi54 min ENE 14 G 16 76°F 76°F3 ft1021.2 hPa (+0.8)72°F
41033 44 mi36 min NE 9.7 G 14 72°F 74°F1022.4 hPa

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hunter U. S. Army Airfield, GA2 mi1.8 hrsE 510.00 miFair74°F69°F86%1021.6 hPa
Savannah-Hilton Head International Airport, GA10 mi51 minE 510.00 miA Few Clouds77°F68°F74%1022.2 hPa
Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA24 mi1.8 hrsENE 510.00 miFair73°F67°F81%1021.9 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrNE4N4E6E6NE4E9NE5NE5NE5NE4NE3N4E4N3N3CalmN3CalmCalmCalmCalmCalmNE4E5
1 day agoCalmN4CalmE3SW3CalmS4E4E3E3CalmCalmCalmCalmCalmCalmCalmCalmNE3N4NE3CalmNE4E4
2 days agoCalmE3CalmCalmE9SE9E8SE5E4E5E3E3CalmCalmE6SE6SE6E3E3E4E3E3E6E6

Tide / Current Tables for Isle of Hope, Skidaway River, Georgia
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Isle of Hope
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Tue -- 12:20 AM EDT     1.00 feet Low Tide
Tue -- 03:57 AM EDT     Moonset
Tue -- 06:36 AM EDT     7.86 feet High Tide
Tue -- 07:37 AM EDT     Sunrise
Tue -- 12:39 PM EDT     1.23 feet Low Tide
Tue -- 05:02 PM EDT     Moonrise
Tue -- 06:38 PM EDT     Sunset
Tue -- 07:07 PM EDT     8.17 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.11.22.23.75.46.97.77.87.15.84.22.61.51.323.34.96.57.78.27.86.75.13.2

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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Tue -- 01:28 AM EDT     0.00 knots Slack
Tue -- 03:47 AM EDT     1.09 knots Max Flood
Tue -- 03:56 AM EDT     Moonset
Tue -- 07:03 AM EDT     -0.00 knots Slack
Tue -- 07:36 AM EDT     Sunrise
Tue -- 10:23 AM EDT     -2.19 knots Max Ebb
Tue -- 01:49 PM EDT     0.00 knots Slack
Tue -- 04:04 PM EDT     1.08 knots Max Flood
Tue -- 05:01 PM EDT     Moonrise
Tue -- 06:37 PM EDT     Sunset
Tue -- 07:17 PM EDT     -0.00 knots Slack
Tue -- 10:44 PM EDT     -2.35 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.4-0.50.511.10.90.70-0.9-1.7-2.2-2.1-1.6-0.80.20.91.110.70.2-0.6-1.6-2.2-2.3

Weather Map
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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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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.