Saturday, March28, 2020
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Marine Weather and Tides
Richmond Hill, 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 7:16AMSunset 7:43PM Saturday March 28, 2020 8:42 PM EDT (00:42 UTC) Moonrise 8:50AMMoonset 10:40PM Illumination 24% Phase: Waxing Crescent; Moon at 5 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- 652 Pm Edt Sat Mar 28 2020
Tonight..S winds 10 to 15 kt. Seas 2 to 3 ft. Patchy fog after midnight.
Sun..SW winds 10 to 15 kt with gusts to 20 kt. Seas 2 to 3 ft. Patchy fog.
Sun night..S winds 10 to 15 kt with gusts to 20 kt, becoming W 5 to 10 kt after midnight. Seas 2 to 3 ft. Patchy fog.
Mon..NW winds 5 to 10 kt, becoming ne in the afternoon. Seas 2 ft.
Mon night..S winds 5 kt. Seas 2 ft in the evening, then seas 1 foot.
Tue..SE winds 5 to 10 kt, becoming S 10 to 15 kt in the afternoon. Seas 2 to 3 ft. A slight chance of showers in the morning, then a chance of showers and tstms in the afternoon.
Tue night..W winds 15 to 20 kt. Seas 2 to 3 ft. A chance of tstms. Showers likely.
Wed..NW winds 15 to 20 kt. Seas 2 to 3 ft.
Wed night..NW winds 10 to 15 kt. Seas 2 to 3 ft.
Thu..N winds 10 to 15 kt. Seas 2 to 3 ft.
Thu night..NE winds 5 to 10 kt. Seas 2 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 652 Pm Edt Sat Mar 28 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Very warm high pressure will prevail through Sunday. A dry cold front will push through Sunday night, followed by high pressure Monday. Low pressure will then cross the area Tuesday into Tuesday night, followed by high pressure through late week.


7 Day Forecast for Marine Location Near Richmond Hill, GA
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location: 31.95, -81.34     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 282259 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 659 PM EDT Sat Mar 28 2020

SYNOPSIS. Very warm high pressure will prevail through Sunday. A dry cold front will push through Sunday night, followed by high pressure Monday. Low pressure will then cross the area Tuesday into Tuesday night, followed by high pressure through late week.

NEAR TERM /UNTIL 6 AM SUNDAY MORNING/. Only minor adjustments required to the forecast. The potential for sea fog to form is low overnight, but should it occur it could certainly brush the barrier islands, especially from Tybee north. For now though there is no reason to add to the forecast. Low stratus seems likely far interior Georgia closer to daybreak.

Previous discussion . Weak southerly flow will persist through tonight as high pressure sits off the coast. Stratus will likely develop across western and central Georgia later tonight, eventually drifting to the east and into our inland GA zones toward daybreak Sunday. We cannot rule out patchy fog though the best probabilities are to the west. Lows expected to drop to the low to mid 60s.

SHORT TERM /6 AM SUNDAY MORNING THROUGH TUESDAY/. Sunday: Ahead of an approaching cold front, deep-layered high pressure will produce another unseasonably warm day featuring record/near record highs in the upper 80s to lower 90s away from the beaches.

Sunday night: A cold front will cross the region. While this front should initially support showers/thunderstorms west of the region Sunday afternoon into Sunday evening, models agree that capping/subsidence produced by the high pressure will dominate over our region, and any upstream convection will dissipate before reaching our area. Thus, the cold front will pass with clouds, a wind shift to the north and advection of drier air/lower dewpoints into the region.

Monday: Weak high pressure will build over the region, and even though temperatures will be somewhat cooler than those of this weekend, highs will still average well-above normal for late March, in the lower/middle 80s at many locations away from the immediate coast, and even in the upper 80s across parts of interior SE GA south of I-16. On the beaches, offshore winds to start will allow temperatures to recover well into the 70s/around 80F. Then, the afternoon sea breeze should drop temperatures at least back into the lower 70s most locations.

Monday night: Clouds should increase/thicken ahead of low pressure developing west of the region. However, rain is not expected. Temperatures should bottom out in the upper 50s to lower 60s inland, and in the lower/middle 60s at the coast.

Tuesday: Low pressure will approach the region during the morning and will track east across the area Tuesday afternoon. In response to intensifying low/mid level moisture transport and increasing deep layered forcing for ascent, precipitation coverage should ramp up as the day progresses. The latest forecasts depicts slight chance/chance PoPS Tuesday morning increasing to likely/categorical most areas Tuesday afternoon. The latest forecast also indicates most of the region breaking into the warm sector with highs ranging from the lower/middle 70s north to the lower/middle 80s south. However, temperature forecasts remain highly uncertain and depend on the exact track of the surface low. Temperatures across northern/inland counties could struggle to climb out of the 60s if precipitation supports an in-situ wedge.

Most importantly, the low pressure will produce the potential for severe weather Tuesday, especially during the afternoon/evening. At one extreme of the solution spectrum, the warm sector could surge into most/all of the forecast area, and the resulting instability could combine with strong/cyclonic shear to support a severe weather event. At the other extreme, greater coverage of precipitation and a more expansive/persistent in-situ wedge could greatly limit the potential for any severe weather. Forecasts mention a chance for thunderstorms Tuesday afternoon/evening, and we will include a brief mention of the potential for severe weather within the Hazardous Weather Outlook. However, critical details remain highly uncertain, so expect this forecast to evolve over the next couple of days.

LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/. Low pressure will shift off the coast Tuesday night and continue to lift away from the area on Wednesday. A few showers could linger into Wednesday, but largely the bulk of precipitation will end Tuesday night. High pressure will then build into the area allowing for dry weather through Thursday. Models beyond this time aren't in the best agreement, although it appears another front and/or low could pass through late week. Temperatures will be more seasonable.

AVIATION /00Z SUNDAY THROUGH THURSDAY/. VFR through 24Z Sunday. Any fog/stratus around 09-14Z Sunday currently looks to stay outside the terminal range. Gusty SW winds expected Sunday afternoon during the warmest part of the day.

Extended Aviation Outlook: Mainly VFR into Tuesday. Flight restrictions likely as low pressure crosses the area with showers Tuesday into later Tuesday night. Also, thunderstorms are possible Tuesday afternoon. Then, mainly VFR should return Wednesday. into Tuesday evening.

MARINE. Since there remains no evidence of sea fog so far, we removed it from the pre-midnight period. Conditions are not that favorable even after midnight though, since wind speeds will likely be to strong overall.

Previous discussion . Southwest winds around 15 kt will continue through tonight. Although models continue to predict sea fog, thus far it has not developed and dewpoints nor wind speeds are expected to differ much during the next 12-18 hours. We did, however, maintain patchy fog over the nearshore waters.

Until the initial cold front advances through the waters Sunday night, patchy fog could develop over the nearshore waters. However, the chance for widespread/significant sea fog remains low.

Expect elevated SW winds as high as 15-20 knots and seas 3-5 feet Sunday into Sunday evening. Then, a dry cold front will cross the waters later Sunday night, and winds will shift to the northwest at 5-10 knots. High pressure will shift over the waters Monday, and the associated weak pressure gradient will promote widespread sea breeze development Monday afternoon. Monday night, under the high pressure variable winds less than 10 kt will prevail. Also, seas will settle back to 2-3 ft Monday and 1-2 ft Monday night. Low pressure will then approach the waters Tuesday and will track over marine zones Tuesday evening. As a result, winds will increase, initially from the east/southeast early Tuesday, veering to the south Tuesday afternoon then to the southwest Tuesday evening. Depending on the track/strength of the low, Small Craft Advisory conditions are possible any time Tuesday afternoon into Tuesday evening, but the probability remains insufficient to justify an Advisory within the saturday afternoon package. Then, as the low pressure intensifies and tracks northeast off the NC coast, a cold front will push through the region, northwest winds will surge into the waters and seas will build. Given the tightening pressure gradient on the southwestern periphery of the Atlantic low/in the wake of the cold front, the probability for Small Craft Advisory conditions will increase significantly. This regime will then persist through Wednesday night, followed by somewhat lighter offshore winds/seas Thursday through Friday.

CLIMATE. Record high maximum and high minimum temperatures into Sunday.

KCHS: Sat 3/28: 88 (2017) / 65 (1987) Sun 3/29: 87 (2012) / 67 (1997)

KSAV: Sat 3/28: 90 (2020) / 67 (1921) Sun 3/29: 90 (1907) / 67 (1991)

KCXM: Sat 3/28: 91 (1907) / 68 (1921) Sun 3/29: 91 (1907) / 68 (1997)

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

NEAR TERM . SHORT TERM . SPR LONG TERM . AVIATION . MARINE . CLIMATE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 24 mi73 min SSW 7 G 11 72°F 68°F1016.5 hPa
SAXG1 - Sapelo Island Reserve, GA 37 mi103 min SSE 11 75°F 1016 hPa (-0.0)70°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 45 mi53 min S 14 G 16 72°F 69°F2 ft1015.9 hPa (+0.4)71°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, GA11 mi47 minSSE 710.00 miFair75°F66°F74%1015.5 hPa
Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA13 mi47 minSSE 710.00 miFair80°F63°F57%1015.1 hPa
Savannah-Hilton Head International Airport, GA15 mi50 minS 1310.00 miPartly Cloudy78°F64°F64%1015.6 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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1 day agoE8E4CalmCalmCalmCalmCalmCalmS3S3SW3SW5SW7SW5W4SW8W5----SW6SW9SW9S5S7
2 days agoCalmCalmNE8E6--E12
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Tide / Current Tables for Highway bridge, Ogeechee River, Georgia
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Highway bridge
Click for Map
Sat -- 02:16 AM EDT     1.06 feet High Tide
Sat -- 07:17 AM EDT     Sunrise
Sat -- 09:49 AM EDT     0.06 feet Low Tide
Sat -- 09:49 AM EDT     Moonrise
Sat -- 02:42 PM EDT     0.93 feet High Tide
Sat -- 07:42 PM EDT     Sunset
Sat -- 10:01 PM EDT     0.05 feet Low Tide
Sat -- 11:40 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.91.110.90.80.60.40.20.10.10.20.50.70.90.90.90.80.60.40.20.10.10.2

Tide / Current Tables for Fort McAllister, Ogeechee River, Georgia
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Fort McAllister
Click for Map
Sat -- 06:40 AM EDT     0.41 feet Low Tide
Sat -- 07:17 AM EDT     Sunrise
Sat -- 09:49 AM EDT     Moonrise
Sat -- 12:11 PM EDT     6.22 feet High Tide
Sat -- 06:52 PM EDT     0.37 feet Low Tide
Sat -- 07:42 PM EDT     Sunset
Sat -- 11:40 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.16.65.64.22.81.50.60.51.434.65.76.265.44.331.70.70.41.12.84.86.2

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 (20,4,5,8)
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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.