Tuesday, January19, 2021
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Marine Weather and Tides
Richmond Hill, 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 7:23AMSunset 5:48PM Tuesday January 19, 2021 1:13 PM EST (18:13 UTC) Moonrise 11:32AMMoonset 12:00AM Illumination 38% Phase: Waxing Crescent; Moon at 6 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- 1058 Am Est Tue Jan 19 2021
This afternoon..Variable winds 5 kt. Seas 1 foot.
Tonight..SW winds 5 to 10 kt, increasing to 10 to 15 kt after midnight. Seas 1 foot.
Wed..W winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Seas 2 ft.
Wed night..NW winds 5 to 10 kt. Seas 2 ft.
Thu..W winds 5 to 10 kt, becoming sw 10 to 15 kt in the afternoon. Seas 1 to 2 ft.
Thu night..SW winds 10 to 15 kt. Seas 2 ft. A chance of showers.
Fri..SW winds 10 to 15 kt. Seas 2 ft. A chance of showers.
Fri night..NW winds 5 to 10 kt. Seas 2 ft. A chance of showers.
Sat..NE winds 10 to 15 kt. Seas 3 to 4 ft.
Sat night..NE winds 10 to 15 kt. Seas 3 to 4 ft.
AMZ300 1058 Am Est Tue Jan 19 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail before a weak cold front passes through the region on Friday, followed by high pressure for the weekend. A stronger cold front is expected to effect the area early next 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 191556 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1056 AM EST Tue Jan 19 2021

SYNOPSIS. High pressure will prevail before a weak cold front passes through the region on Friday, followed by high pressure for the weekend. A stronger cold front is expected to effect the area early next week.

NEAR TERM /THROUGH TONIGHT/. Today: Zonal flow will prevail aloft while high pressure prevails at the surface. A very quiet day is on tap as deep dry air is in place producing sunny skies. Since the surface high is nearly directly on top of the forecast area, the pressure gradient will be much weaker and we won't see a repeat of the breezy conditions from the last two days. Instead, winds will top out in the 5-10 mph range. Low-level thickness scheme once again supports highs in the upper 50s, but modest warm advection should allow us to out-perform such values. The forecast calls for low 60s in most areas, with some mid 60s possible south of I-16 near the Altamaha River.

Tonight: High pressure will weaken as a dry cold front approaches from the northwest and dives into the forecast area late. The main impact will be to bring in some mid-level moisture and produce increasing cloud cover as sunrise Wednesday approaches. Temperatures won't be quite a cold, with lows falling into the low to mid 40s. Lows will likely occur early before leveling off late as cloud cover increases.

SHORT TERM /WEDNESDAY THROUGH FRIDAY/. Wednesday through Friday: Surface high pressure will prevail over the Southeast Wednesday, maintaining dry and rain-free conditions. A weak upper disturbance will pass to our north; however with a dry airmass in place, precipitation is unlikely. On Thursday, surface high pressure shifts over southern FL and mid-level ridging over the Gulf of Mexico helps to advect moisture via SW winds into the Southeast. In addition, gradual coupling of the polar and subtropical jet will produce a fairly zonal jet streak over the Mid Atlantic states. Upper divergence in its right entrance region will spawn broad sfc low pressure over the TX/LA region. A weak, slow- moving cold front associated with the low approaches the region from the west Friday, which is expected to bring isolated to scattered showers to southeast SC and GA. Isolated showers could reach our western counties as early as Thursday night, due to the advection of moisture ahead of the front. PWATs look to max out around 1.25" which could yield some areas of moderate rainfall Friday afternoon, especially in the GA counties west of I-95 before the greater moisture content begins to move offshore.

Expect similar max temperatures each day through Friday with highs in the low 60s. Minimum temperatures will drop to the upper 30s/low 40s Wednesday night. Thursday night will be slightly warmer with temps in the low 50s.

LONG TERM /FRIDAY NIGHT THROUGH MONDAY/. Building high pressure and drier conditions are expected Sunday/Monday in the wake of a cold front. A slightly stronger cold front will approach the area Tuesday. Temperatures should return to near normal early in the week with the cooler air mass over the area, before they begin to warm prior to the approach of the front. Showers associated with the front are likely to effect the region late Monday night through Tuesday night.

AVIATION /16Z TUESDAY THROUGH SATURDAY/. VFR conditions will prevail at KCHS and KSAV through 12z Wednesday.

Extended Aviation Outlook: VFR through Thursday. A weak cold front could bring flight restrictions Thursday night into Friday.

MARINE. Today through tonight: Conditions will be quite tranquil for much of the day with winds 5 knots or less and seas around 1 ft. Overnight, winds will turn southwesterly and increase as a dry cold front approaches from the northwest. Speeds will increase into the 15-20 knot range for the Charleston County waters, with a few gusts to around 25 knots possible out near the 20 nm line. There is a chance conditions could become marginally supportive of a Small Craft Advisory, but confidence isn't high enough with this package to hoist one now. Elsewhere winds will generally top out around 15 knots by late tonight. Seas will response to the increased southwesterly flow and become 1-3 feet by sunrise Wednesday.

Wednesday through Sunday: High pressure will remain in place over the waters with 1-3 ft seas and westerly winds 15 to 20 kt, decreasing to 10-15 kt or less by the evening. A weak cold front is expected to approach from the west Friday, which will cause seas to build up to 2-5 ft Thursday night (with the highest seas located in the Charleston County nearshore waters) and SW winds to increase to 15 to 20 kt. Gusts could approach 25 kt and some portions of the waters could meet Small Craft Advisory conditions. A brief lull in the winds is expected Friday night as winds shift out of the northeast, followed by a secondary surge in the winds Saturday as the front moves offshore. Conditions should remain below Small Craft Advisory criteria, however. Winds/seas are expected to gradually decrease/subside Sunday.

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



NEAR TERM . BSH/JRL SHORT TERM . BRM LONG TERM . BRM AVIATION . BRM/BSH MARINE . BRM/BSH


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 24 mi56 min S 5.1 G 7 55°F 52°F1029 hPa
SAXG1 - Sapelo Island Reserve, GA 37 mi74 min SW 4.1 58°F 1029 hPa (+0.0)33°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 46 mi84 min NE 1.9 G 1.9 55°F 55°F1 ft1029.6 hPa (+1.2)43°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 mi78 minSSW 410.00 miFair61°F27°F27%1028.4 hPa
Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA13 mi78 minN 010.00 miFair60°F27°F28%1028.4 hPa
Savannah-Hilton Head International Airport, GA15 mi21 minWSW 510.00 miA Few Clouds64°F26°F24%1027.7 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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SW4CalmW5CalmCalmCalmW4CalmCalmCalmCalmCalmCalmW3NW3CalmCalmCalmS4W5
1 day agoW10SW6W6W8SW5S4SW6SW5SW6SW4CalmSW4SW6SW6SW4SW8W8W8W8W9W10NW11
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Tide / Current Tables for Highway bridge, Ogeechee River, Georgia
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Highway bridge
Click for Map
Tue -- 03:33 AM EST     0.92 feet High Tide
Tue -- 07:24 AM EST     Sunrise
Tue -- 10:42 AM EST     0.10 feet Low Tide
Tue -- 11:31 AM EST     Moonrise
Tue -- 03:59 PM EST     0.91 feet High Tide
Tue -- 05:47 PM EST     Sunset
Tue -- 11:11 PM EST     0.06 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20.50.70.90.90.80.70.50.40.20.10.10.20.40.70.80.90.90.80.60.40.30.10.1

Tide / Current Tables for Fort McAllister, Ogeechee River, Georgia
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Fort McAllister
Click for Map
Tue -- 01:02 AM EST     6.12 feet High Tide
Tue -- 07:24 AM EST     Sunrise
Tue -- 07:33 AM EST     0.73 feet Low Tide
Tue -- 11:31 AM EST     Moonrise
Tue -- 01:28 PM EST     6.08 feet High Tide
Tue -- 05:47 PM EST     Sunset
Tue -- 08:02 PM EST     0.45 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.76.15.853.82.61.50.80.81.62.84.15.3665.44.331.80.80.40.923.4

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station




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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.