Saturday, April4, 2020
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Marine Weather and Tides
Midway, 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 7:08AMSunset 7:49PM Saturday April 4, 2020 7:38 PM EDT (23:38 UTC) Moonrise 3:03PMMoonset 4:02AM Illumination 90% 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- 641 Pm Edt Sat Apr 4 2020
Tonight..E winds 10 kt. Seas 2 to 3 ft.
Sun..E winds 10 to 15 kt. Seas 2 to 3 ft.
Sun night..SE winds 5 to 10 kt. Seas 2 to 3 ft.
Mon..S winds 5 to 10 kt. Seas 2 to 3 ft.
Mon night..S winds 10 kt. Seas 2 to 3 ft.
Tue..SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers.
Tue night..SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers.
Wed..W winds 10 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Wed night..W winds 10 to 15 kt. Seas 2 to 3 ft.
Thu..SW winds 10 to 15 kt. Seas 2 ft.
Thu night..W winds 10 to 15 kt. Seas 3 to 4 ft. A slight chance of showers. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 641 Pm Edt Sat Apr 4 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail into early next week. A cold front is expected to move through the region towards the end of next week.


7 Day Forecast for Marine Location Near Midway, GA
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location: 31.73, -81.21     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 042255 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 655 PM EDT Sat Apr 4 2020

SYNOPSIS. High pressure will prevail into early next week. A cold front is expected to move through the region towards the end of next week.

NEAR TERM /UNTIL 6 AM SUNDAY MORNING/. Southern stream shortwave energy embedded within the subtropical jet will traverse the region. This feature will push through dry as surface high pressure holds firm, but will bring extensive high-level moisture in the form of increasing thick cirrus.While we did maintain this trend, we did slow down it's arrival by a few hours from the previous forecast, leading to mostly clear skies early on.

The boundary layer will decouple once again, but winds will stay up across the coastal counties where the onshore fetch will persist. Lows will range from the lower 50s north and northwest tier, mid and upper 50s most elsewhere, but with a few places 60-62F along the barrier islands.

SHORT TERM /6 AM SUNDAY MORNING THROUGH TUESDAY/. Sunday: Broad, but relatively flat ridging will prevail aloft, while surface high pressure initially centered over Virginia and North Carolina elongates as it moves offshore and encompasses the forecast region. The combination of the southern branch of the sub-tropical jet and an embedded short that moves over or near our southern zones will bring varying amounts of mid and high level clouds, especially the first half of the day. The associated lift from these features and the sea breeze might be enough to generate a few showers near the Altamaha River, mainly in the afternoon. temps will be able to warm to 76-81F most places inland, but an easterly breeze reaching around 15 mph will hold shoreline locations to near 70F north and mid 70s south.

Sunday night: What little shower activity there is will be gone by sunset, and we anticipate a dry night with a dry west-northwest flow and large scale subsidence under surface high pressure overhead. As winds decouple and skies turn out mostly clear, there is some chance for fog. We added mention of patchy fog inland from I-95, where those locations have the best chance of achieving their cross-over temps. Although some of the MOS guidance does depict dense fog, the SREF probabilities are low of such an occurrences, and condensation pressure deficits are currently forecast to be much too high. While the vast majority of places will get down into the mid and upper 50s, this is still several degrees above normal.

Monday: High pressure will pull further offshore, but the associated ridge axis will extend back across the local vicinity. While there aren't any significant short waves aloft, there is a jet streak that crosses the Appalachians late in the day, and a weak cold front that will lie just downstream from the mountains. That along with the resultant sea breeze might be able to generate a few showers north and northwest zones in the afternoon. Although there is a little instability, the risk for any thunderstorms is too low to add to the forecast. With plenty of insolation after the early morning fog, with a deep offshore flow above the boundary layer we look to make it into the lower and middle 80s. As usual, shoreline communities will be at least 5-10F cooler.

Tuesday: The mid and upper level ridge to our west maintains its location and intensity, leading to a continued west to northwest flow aloft. Despite this, conditions favor a slightly better chance of showers than lately, given difluence from the upper jet overhead, a short wave passing over or just north of the region and deeper atmospheric moisture. With the remnants of the upstream cold front or a lee side trough and the sea breeze, we went with chance PoP's, mainly in the afternoon. We didn't go any higher at this time since both the ECMWF and Canadian are both showing little to no coverage of activity. There is a little instability, but lapse rates are poor and there might be too much cloud cover. So no mention of thunderstorms at this stage. Temps won't be quite as warm as Monday, but will yet again be well above climo.

LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/. High pressure in the Atlantic will be pumping moisture into the Southeast while surface troughing forms. Additionally, a cold front will slowly approach from the northwest by the middle of next week, moving through during the second half of next week. Models still vary quite a bit on the shower potential each day, along with the timing of the cold front. We were forced to go with a blend of the models again with POPs no higher than chance. Temperatures will be above normal, possibly into Thursday, cooling down on Friday.

AVIATION /00Z SUNDAY THROUGH THURSDAY/. VFR.

Extended Aviation Outlook: VFR through at least Monday. Potential for brief flight restrictions in fog around daybreak Monday at KSAV. Then showers could bring brief flight restrictions to both terminals late Tuesday into Wednesday.

MARINE. Tonight: Generally easterly winds at 10 to 15 kt or less will prevail as high pressure remains to the north. Significant wave heights will be about 2-3 ft within 20 nm and 3-4 ft in the 20-60 nm zone.

Sunday through Thursday night: High pressure initially along the eastern seaboard will progressively move further southeast through the upcoming week. Onshore flow at the start of the period will transition to more of a parallel or slightly offshore flow by mid week. The exceptions of course will be during afternoon and evening sea breeze influences. For now winds look to max out at 15 kt or less, and since swells will gradually climb, we could achieve some 6 foot seas on the outer Georgia and Charleston County Atlantic waters later in the period. Thus there is some chance of Small Craft Advisories for AMZ350 and AMZ374 late in the week.

TIDES/COASTAL FLOODING. Higher than normal tide levels are expected through much of next week due to astronomical influences from the upcoming full moon and lunar perigee. Additionally, winds are forecasted to be onshore at times, which would further elevate the tides. Minor coastal flooding is possible during some of the high tides, mainly in the morning early in the week and in the evening later in the week, especially along the SC coast.

The first chance for a Coastal Flood Advisory will be with the 600-630 am high tide along parts of the South Carolina coast. Recent indications are that it'll be right around 7.0 ft MLLW in Charleston harbor. But since it is marginal and would only briefly occur, for the present time we did not issue the advisory.Instead we'll continue to carefully monitor tide trends.

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

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SAXG1 - Sapelo Island Reserve, GA 22 mi99 min ENE 8.9 71°F 1013 hPa (-1.0)59°F
FPKG1 - 8670870 - Fort Pulaski, GA 27 mi51 min ESE 5.1 G 8 69°F 66°F1014.5 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 29 mi49 min ENE 12 G 14 69°F 68°F2 ft1013.3 hPa (+0.4)61°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, GA21 mi43 minESE 710.00 miFair70°F44°F39%1013.5 hPa
Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA22 mi43 minE 610.00 miFair72°F41°F33%1013.1 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrS4SW3CalmSW3CalmCalmCalmCalmCalmW3W3W3N8CalmNE8E9--E10E9E7E9E7E9E7
1 day ago----CalmCalmCalmCalmCalmCalmW3CalmCalmCalmNW4CalmNE3E3CalmCalmW3W4SW3
G15
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2 days agoN5CalmCalmCalmCalmCalmCalmCalmCalmNW3N6N7N4NE8N6N7NW5NW6--W7W5W9W7NW5

Tide / Current Tables for North Newport River (Daymark 119), Georgia
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Florida Passage, Bear River, Georgia
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Florida Passage
Click for Map
Sat -- 12:09 AM EDT     0.18 feet Low Tide
Sat -- 05:01 AM EDT     Moonset
Sat -- 06:08 AM EDT     8.06 feet High Tide
Sat -- 07:08 AM EDT     Sunrise
Sat -- 12:46 PM EDT     0.16 feet Low Tide
Sat -- 04:02 PM EDT     Moonrise
Sat -- 06:44 PM EDT     7.63 feet High Tide
Sat -- 07:46 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.62467.48.17.76.65.13.41.70.50.212.74.66.37.47.675.742.1

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 (19,4,5,8)
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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.