Thursday, July2, 2020
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Marine Weather and Tides
Garden City, 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 6:21AMSunset 8:36PM Thursday July 2, 2020 2:21 PM EDT (18:21 UTC) Moonrise 5:19PMMoonset 3:01AM Illumination 91% Phase: Waxing Gibbous; Moon at 12 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- 213 Pm Edt Thu Jul 2 2020
This afternoon..W winds 5 to 10 kt, becoming sw. Seas 1 to 2 ft. A slight chance of showers and tstms.
Tonight..S winds 5 kt, becoming sw after midnight. Seas 2 ft. A chance of showers and tstms in the evening.
Fri..N winds 5 to 10 kt, becoming E in the afternoon. Seas 2 ft in the morning, then seas 1 foot. A slight chance of showers and tstms in the afternoon.
Fri night..S winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Sat..N winds 5 kt, becoming se in the afternoon. Seas 2 ft. A slight chance of showers and tstms.
Sat night..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Sun..SE winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Sun night..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Mon..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Mon night..S winds 10 kt. Seas 2 to 3 ft. A chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 213 Pm Edt Thu Jul 2 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A stationary front will linger over or near the area into this weekend. A low pressure system could then impact the area early next week with drier weather to likely follow through Wednesday.


7 Day Forecast for Marine Location Near Garden City, GA
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location: 32.07, -81.11     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 021538 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1138 AM EDT Thu Jul 2 2020

SYNOPSIS. A stationary front will linger over or near the area into this weekend. A low pressure system could then impact the area early next week with drier weather to likely follow through Wednesday.

NEAR TERM /THROUGH TONIGHT/. Today: A small cluster of showers continues near the South Carolina and Georgia state line where h5 shortwave is advancing east- southeast and eventually shifting offshore. For the next few hours showers will continue in this area before shifting off the coast. As we enter the afternoon, the mid/upper levels will feature a trough of low pressure extending south along the Eastern Seaboard and strong ridging associated with high pressure across much of the Central United States. At the sfc, a weak/stationary front will remain draped across the area for the day. Subtle waves of energy will form along the front, which in combination with an afternoon seabreeze should provide the main focus of afternoon/evening convection. At this time, the severe weather threat will remain low across the area, but a few stronger thunderstorms and/or isolated severe thunderstorm can not be ruled out given MLCAPE approaching 1500-2000 J/kg as sfc temps peak in the upper 80s to lower 90s this afternoon and DCAPE approaching 1000-1200 J/kg as drier air begins to shift into the region aloft from the northwest. Should a strong and/or severe thunderstorm develop this afternoon into the evening, the main concern will be damaging wind gusts.

Tonight: A more pronounced surface low forms well offshore in response to short wave energy aloft, as high pressure noses in from the upper Midwest and upper Mississippi Valley regions. Isolated to scattered convection in the evening will fade quickly, ending no later than about 10 to 11 pm. Decreasing cloud cover, light or calm winds and wet grounds will promote the formation of patchy fog. The best chances of such occurring would be along our northwest tier of the South Carolina counties where the most favorable condensation pressure deficits will be found. There could actually be a few upper 60s in the Francis Marion National Forest, otherwise lower and middle 70s will be more common.

SHORT TERM /FRIDAY THROUGH SUNDAY/. Moderate confidence this period. Latest medium range guidance is in a bit better agreement compared to 24 hr ago. A weak low pressure system is likely to be well east of the area into the Atlantic Friday before pulling farther away while another weak low pressure system possibly develops inland Saturday night or Sunday. The deepest moisture will be south of the forecast area until possibly Sunday so rain chances look minimal until then, and even on Sunday should mainly be in GA. No significant severe/flash flood potential is expected through the period.

Temperatures should be above normal until possibly Sunday when they could drop below normal.

LONG TERM /SUNDAY NIGHT THROUGH WEDNESDAY/. Low to moderate confidence this period with much depending on the evolution of weak low pressure over or near the area early in the period, mainly Monday and Tuesday. At this point we think the chance of severe weather/flash flooding will be low. The best risk for flash flooding is likely to be in coastal flood-prone areas like Downtown Charleston around times of high tide. High temperatures should be near to below normal, likely coolest on Monday, while low temperatures likely stay above normal.

AVIATION /15Z THURSDAY THROUGH MONDAY/. VFR will prevail at both KCHS and KSAV through 12Z Friday. However, since scattered SHRA/TSRA will form during the mid and late afternoon hours today, we have mention of VCTS from 19Z through to about 23-24Z. Should a direct impact from this convection occur, gusty winds and flight restrictions could briefly occur. There could be a little fog late tonight, especially if rain occurs prior to then. But not enough to justify including in the forecast at this time.

Extended Aviation Outlook: Moderate to high confidence in mostly VFR conditions at KCHS/KSAV through Tuesday. Periodic restrictions expected, mainly from afternoon/evening showers and thunderstorms starting Sunday.

MARINE. Today and Tonight: A broad area of low pressure will begin to shift off the Southeast coast near a stationary front today, favoring west winds at or below 10 kts becoming more south during the day. Further offshore, wind speeds should temporarily gust between 15-20 kt, before slowly weakening through the afternoon. Seas will generally range between 1-2 across nearshore waters and 2-3 across offshore Georgia waters. Overnight, an area of low pressure will form along the front to the east of the local waters as it heads further offshore with time. Outside of any isolated to scattered convection, there are no concerns regarding winds and seas.

Friday through Tuesday: Moderate to high confidence through Friday with low to moderate confidence thereafter as a low pressure system could move over or near the waters. At this time we are forecasting winds mostly 15 kt or less and seas mostly 3 ft or less, although much depends on the strength/track of the potential low pressure system.

TIDES/COASTAL FLOODING. Positive tidal departures will continue again today, leading to the risk for shallow salt water flooding with the 630-700 pm high tide over parts of the South Carolina coast, mainly in and near downtown Charleston. A Coastal Flood Advisory will likely be required at a later time.

Astronomical influences will make tides higher than normal into early next week and a potential low pressure system early next week could cause even higher tides. At this time we think the best chance of mainly minor coastal flooding will be along the South Carolina coast around the times of the evening high tides. Coastal Flood Advisories could be required. Furthermore, the risk for heavy rain will only add to any tidal flooding.

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

NEAR TERM . DPB SHORT TERM . DPB/RJB LONG TERM . RJB AVIATION . DPB MARINE . DPB TIDES/COASTAL FLOODING .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 11 mi51 min W 9.9 G 13 82°F 82°F1012.9 hPa
41033 40 mi73 min WNW 9.7 G 14 80°F 82°F1011.9 hPa
SAXG1 - Sapelo Island Reserve, GA 46 mi81 min WNW 8 88°F 1013 hPa (+0.0)73°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 48 mi31 min NW 1.9 G 3.9 82°F 82°F2 ft1012.5 hPa (+0.0)74°F
ACXS1 - ACE Basin Reserve, SC 48 mi96 min W 1.9 83°F 1012 hPa75°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, GA3 mi25 minW 1010.00 miMostly Cloudy88°F74°F64%1011.8 hPa
Savannah-Hilton Head International Airport, GA7 mi28 minSW 810.00 miMostly Cloudy86°F75°F70%1012.3 hPa
Hilton Head Island, Hilton Head Airport, SC24 mi31 minW 610.00 miPartly Cloudy86°F75°F70%1012.5 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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CalmW6S6S3SW4SW5SW7SW8W7SW7SW5SW6SW6SW6W6W8NW10W7NW6W6W10
1 day agoW9SW7NW8W9W18
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--W9W9W12W9W6W4W3W4W6W6W6W8W7----W7W8W13
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Tide / Current Tables for Savannah (Bull Street), Georgia
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Savannah (Bull Street)
Click for Map
Thu -- 01:06 AM EDT     -0.03 feet Low Tide
Thu -- 04:00 AM EDT     Moonset
Thu -- 06:22 AM EDT     Sunrise
Thu -- 06:33 AM EDT     7.76 feet High Tide
Thu -- 01:13 PM EDT     -0.45 feet Low Tide
Thu -- 06:18 PM EDT     Moonrise
Thu -- 07:26 PM EDT     9.06 feet High Tide
Thu -- 08:34 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.8-00.62.44.66.67.67.76.95.53.71.90.4-0.4-01.74.16.48.298.98.16.54.5

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Thu -- 01:29 AM EDT     0.01 knots Slack
Thu -- 03:54 AM EDT     1.83 knots Max Flood
Thu -- 03:59 AM EDT     Moonset
Thu -- 06:21 AM EDT     Sunrise
Thu -- 07:26 AM EDT     -0.00 knots Slack
Thu -- 10:53 AM EDT     -1.93 knots Max Ebb
Thu -- 01:27 PM EDT     0.01 knots Slack
Thu -- 04:16 PM EDT     2.26 knots Max Flood
Thu -- 06:17 PM EDT     Moonrise
Thu -- 08:13 PM EDT     -0.00 knots Slack
Thu -- 08:33 PM EDT     Sunset
Thu -- 11:46 PM EDT     -2.44 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.9-0.70.71.61.81.61.20.4-0.6-1.4-1.8-1.9-1.6-0.60.71.82.22.21.91.30.3-0.9-1.7-2.3

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (14,3,4,5)
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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.