Monday, January20, 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 7:23AMSunset 5:48PM Monday January 20, 2020 10:09 AM EST (15:09 UTC) Moonrise 3:34AMMoonset 2:15PM Illumination 21% Phase: Waning Crescent; Moon at 25 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- 628 Am Est Mon Jan 20 2020
.small craft advisory in effect until 10 am est this morning...
Today..N winds 15 to 20 kt with gusts to 25 kt, diminishing to 10 to 15 kt late. Seas 3 to 4 ft.
Tonight..N winds 15 to 20 kt. Seas 3 to 4 ft.
Tue..N winds 15 to 20 kt with gusts to 30 kt. Seas 3 to 4 ft.
Tue night..N winds 20 to 25 kt with gusts to 30 kt. Seas 4 to 5 ft, building to 4 to 6 ft after midnight.
Wed..N winds 20 to 25 kt, becoming ne 15 to 20 kt in the afternoon. Seas 4 to 6 ft.
Wed night..NE winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 6 ft.
Thu..NE winds 15 kt. Seas 4 to 5 ft. A slight chance of showers.
Thu night..NE winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers.
Fri..SE winds 5 to 10 kt. Seas 3 to 4 ft. A chance of showers.
Fri night..S winds 10 kt. Seas 3 to 4 ft. Showers likely.
AMZ300 628 Am Est Mon Jan 20 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will build across the area through midweek, then weaken late week in advance of a low pressure system impacting the region this weekend. High pressure will then return late weekend and persist into 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 201143 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 643 AM EST Mon Jan 20 2020

SYNOPSIS. High pressure will build across the area through midweek, then weaken late week in advance of a low pressure system impacting the region this weekend. High pressure will then return late weekend and persist into early next week.

NEAR TERM /THROUGH TONIGHT/. Today: The mean upper trough across the eastern half of the country will continue to deepen as upper waves dig southeast from the midwest to the southeast states. While modified continental polar air arrives, surface high pressure will continue to build into our forecast area. Deep layered dry air will result in sunshine today, some increase in high clouds probable this afternoon as a strong upper jet slices through the region. 850 mb temps will continue to plummet with the zero degree isotherm going south of our entire forecast area by late afternoon. We have not altered high temps much with max temps in the mid 40s north to upper 40s south.

Tonight: Freezing conditions are likely to the beaches of SC with the GA barrier islands possibly reaching 32 degrees degrees right off the Atlantic. Winds will likely continue to stir overnight in most areas as gradient remain tight as a potent mid level low at 500 mb takes shape over the southeast U.S. Wind chills are expected to dip to the upper teens to lower 20s by daybreak on Tuesday.

Lake Winds: Conditions have been close to advisory thresholds on Lake Moultrie overnight. We initialized our forecast with North Winds 15-20 kt and waves 1-2 ft.

SHORT TERM /TUESDAY THROUGH THURSDAY/. Tuesday: Dry and cold high pressure will prevail at the sfc while a mid-lvl low rounds the southern base of a broad trough of low pressure across much of the East Conus. Strong cold air advection associated with the mid-lvl low in combination with northerly sfc winds will limit overall temps under mostly sunny skies. In general, temps will struggle to reach the low/mid 40s during peak diurnal heating. Winds could also be breezy along the coast, peaking between 15-20 mph at times. Overnight, temps will be chilly under little clouds and within a persistent northerly sfc wind. The pressure gradient will remain quite strong along the coast, suggesting winds in the 20-25 mph range during the night. These winds in combination with overnight lows in the mid/upper 20s inland to lower 30s near the coast should support wind chill values in the upper teens, but conditions are expected to remain above Wind Chill Advisory criteria for all areas. Another concern during the overnight period will be gusty winds across Lake Moultrie where warmer waters promote strong mixing in the low levels as cold air advection occurs aloft. A Lake Wind Advisory could be needed across Lake Moultrie Tuesday night into Wednesday.

Wednesday: Breezy northerly winds (15-20 mph) could persist along coastal areas through much of the morning as the pressure gradient remains enhanced between low pressure offshore and high pressure centered to the north. Conditions will be dry, but temps will struggle to warm significantly as high pressure remains wedged southward across the Carolinas into Georgia. In general, temps will peak in the lower 50s under mostly sunny skies. Overnight, temps will remain slightly warmer than the previous night due to clouds spreading across the area after midnight. In general, temps will dip into the lower 30s inland to mid/upper 30s closer to the coast.

Thursday: A wedge of high pressure should hold across the area through much of the day, but will begin to show signs of weakening as a coastal trough begins to develop along the Southeast Coast late. Sfc winds will turn more northeast as the sfc trough develops and temps will be warmer than the previous day under a ridge of high pressure extended across the region in the mid-lvls. In general, high temps should range in the mid/upper 50s, but a few locations could reach 60 degrees south of I-16 in Southeast Georgia.

LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/. A coastal trough should linger near the Southeast Coast Thursday night into Friday before lifting north and dissipating in advance of a low pressure system approaching from the west. A cold front associated with this system is anticipated to track across the area Friday night into early Saturday, producing scattered to numerous showers for most locations when moisture is deepest and forcing is strongest. Dry high pressure will then build across the area late weekend and become centered across the Southeast early next week.

In regards to temps, conditions will remain mild ahead of the cold front this weekend, with afternoon highs ranging in the mid/upper 60s Friday and lows ranging in the upper 40s to lower 50s Friday night. Temps will be a degree or two cooler on Saturday with fropa ongoing, then remain around 60 degrees for highs Sunday and Monday afternoons and in the upper 30s/lower 40s Sunday and Monday nights.

AVIATION /12Z MONDAY THROUGH FRIDAY/. VFR conditions at KCHS and KSAV through 12Z Tuesday.

Extended Aviation Outlook: VFR conditions are then expected at both CHS and SAV terminals through late week. Flight restrictions are possible during the weekend due to showers and low clouds associated with a passing cold front.

MARINE. SCAs ongoing all waters this morning as strong cold advection and drier air advecting over the area, resulting in steeper low level lapse rates and excellent mixing profiles. We have SCAs for the Charleston Harbor and near shore GA/SC waters through 10 AM. Given 12Z observations, we certainly could need some extensions.

Winds will remain gusty at times late day, however winds and seas should be below SCA criteria into the early evening. Later tonight, the gradient will tighten once again and we will likely need to reintroduce SCAs for all near shore waters, but probably not the CHS Harbor. We have extended the SCA through tonight and beyond for 20-60 NM GA waters as warmer waters well offshore likely to result in stronger wind gusts and higher seas.

Tuesday through Saturday: A strong pressure gradient is expected to develop across the coastal waters heading into Tuesday between high pressure building from the north and low pressure deepening offshore. The enhanced gradient along with the strongest period of cold air advection associated with a mid-lvl low shifting offshore will likely support Small Craft Advisory conditions across offshore Georgia waters by Tuesday morning and most coastal waters starting Tuesday afternoon. Winds/seas should peak Tuesday evening into Wednesday when the pressure gradient is most enhanced within a chilly northerly wind. Latest guidance even supports gale force wind gusts for a portion of the coastal waters and a Gale Watch/Warning could eventually be needed (especially across northern South Carolina waters and offshore Georgia waters). In general, north- northeast wind speeds could gust upwards to 25-35 kts while seas build as high as 4-7 ft across nearshore waters and 8-11 ft across offshore waters Tuesday night and Wednesday.

Marine conditions should gradually improve on Thursday, but Small Craft Advisory level conditions should persist as north/northeast sfc flow prevails across all coastal waters. Conditions should then continue to improve Thursday night into Friday as winds turn more onshore in association with a coastal trough along the Southeast Coast. By Friday night, southerly flow returns across all waters in advance of a low pressure system advancing toward the coast from the west. A cold front is expected to shift offshore Saturday, before high pressure builds across the waters late. Conditions will become elevated post fropa, but should remain below Small Craft Advisory levels across all waters.

TIDES/COASTAL FLOODING. Cold high pressure will build across the area mid-week while low pressure deepens offshore. Strong north-northeast winds between these two features will help produce elevated tide levels a few days before the upcoming new moon (Jan 24). Tide levels could reach 7.0 FT MLLW along the Southeast South Carolina coast during the Wednesday morning high tide and a Coastal Flood Advisory could eventually be needed.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory until 10 AM EST this morning for AMZ330- 350-352-354. Small Craft Advisory until 3 AM EST Saturday for AMZ374.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 24 mi58 min NNE 13 G 18 40°F 57°F1026.2 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 45 mi80 min NNE 21 G 27 47°F 60°F5 ft1023.4 hPa (+2.9)38°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 mi2.2 hrsN 910.00 miA Few Clouds38°F22°F55%1024.4 hPa
Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA13 mi2.2 hrsNNW 410.00 miFair35°F26°F69%1025 hPa
Savannah-Hilton Head International Airport, GA15 mi77 minNNE 1110.00 miA Few Clouds40°F23°F51%1026.1 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrSW7W11NW9NW8W8W10NW11W14W10NW14W9W10NW11NW12NW9NW8NW11NW11NW8N7N10
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1 day agoN5NE6E5E5S4SE6S6S6S5S4S7S12
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SW8SW9SW6SW8SW5SW6SW6SW5W5SW5S7--
2 days agoNE14
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Tide / Current Tables for Highway bridge, Ogeechee River, Georgia
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Highway bridge
Click for Map
Mon -- 02:18 AM EST     -0.04 feet Low Tide
Mon -- 03:33 AM EST     Moonrise
Mon -- 07:24 AM EST     Sunrise
Mon -- 07:32 AM EST     1.06 feet High Tide
Mon -- 02:15 PM EST     Moonset
Mon -- 03:09 PM EST     0.01 feet Low Tide
Mon -- 05:47 PM EST     Sunset
Mon -- 07:44 PM EST     0.93 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.20-000.20.60.911.110.80.70.50.20.100.10.30.70.90.90.90.70.6

Tide / Current Tables for Fort McAllister, Ogeechee River, Georgia
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Fort McAllister
Click for Map
Mon -- 03:33 AM EST     Moonrise
Mon -- 05:01 AM EST     7.07 feet High Tide
Mon -- 07:24 AM EST     Sunrise
Mon -- 12:00 PM EST     0.06 feet Low Tide
Mon -- 02:15 PM EST     Moonset
Mon -- 05:13 PM EST     6.19 feet High Tide
Mon -- 05:47 PM EST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.11.53.45.26.67.16.864.83.31.70.50.10.62.13.95.56.265.24.12.81.30.2

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.
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Wind Forecast for Charleston, SC (10,2,3,4)
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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.