Friday, January22, 2021
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Marine Weather and Tides
Yemassee, SC

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 7:20AMSunset 5:48PM Friday January 22, 2021 7:28 PM EST (00:28 UTC) Moonrise 12:56PMMoonset 1:58AM Illumination 72% Phase: Waxing Gibbous; Moon at 10 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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AMZ352 Waters From Edisto Beach Sc To Savannah Ga Out 20 Nm- 605 Pm Est Fri Jan 22 2021
Tonight..NW winds 5 to 10 kt, becoming N 10 to 15 kt late. Seas 1 to 2 ft. A chance of rain this evening.
Sat..NE winds 15 to 20 kt. Seas 2 to 3 ft, building to 3 to 4 ft in the afternoon.
Sat night..NE winds 15 kt with gusts to 20 kt. Seas 3 to 4 ft, subsiding to 2 to 3 ft after midnight.
Sun..E winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers.
Sun night..SE winds 5 to 10 kt, becoming S 10 to 15 kt after midnight. Seas 2 to 3 ft. A slight chance of showers.
Mon..SW winds 10 to 15 kt. Seas 3 to 4 ft.
Mon night..SW winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft.
Tue..W winds 15 to 20 kt. Seas 3 to 4 ft. A slight chance of showers.
Tue night..N winds 10 to 15 kt. Seas 2 to 3 ft.
Wed..NE winds 15 kt. Seas 3 to 4 ft. A chance of showers.
Wed night..E winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers.
AMZ300 605 Pm Est Fri Jan 22 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail over the weekend, before another cold front crosses the area early next week. Another storm system could impact the region mid to late week.


7 Day Forecast for Marine Location Near Yemassee, SC
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location: 32.68, -80.74     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 230012 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 712 PM EST Fri Jan 22 2021

SYNOPSIS. High pressure will prevail over the weekend, before another cold front crosses the area early next week. Another storm system could impact the region mid to late week.

NEAR TERM /UNTIL 6 AM SATURDAY MORNING/. No major changes to the early evening update. However, we are having more concerns that low stratus and/or fog will form as skies start to clear out from the north and prior to the better cold advection arriving. Given the wet grounds and a decent inversion off the surface, we may need to expand on the coverage of fog that we presently only have in parts of southeast Georgia. Minimum temperatures will be considerably colder than last night.

This Evening and Tonight: Light rains will steadily decrease from north to south across Southeast Georgia early this evening behind a cold front drifting further south of the area in response to a h5 shortwave traversing the region within a zonal flow aloft. A weak cold front/wind shift should then approach the area from the north after midnight with cool and dry high pressure in its wake. The main issue will be timing of this feature and how soon it will result in cloud cover clearing out from north to south across the local area late. Latest guidance suggests most clouds scattering out by daybreak across Southeast South Carolina while potentially remaining across southern portions of Southeast Georgia. Patchy fog is possible across Southeast Georgia late, especially where grounds remain wet from previous rainfall and condensation pressure deficits are favorable, but overall coverage could remain limited once cold air advection takes place within high pressure arriving from the north. Overnight lows will be considerably cooler than the previous night as high pressure and a northerly wind prevail late. In general, lows should dip into the mid 30s inland to low/mid 40s south of I-16 in Southeast Georgia and near the coast.

SHORT TERM /6 AM SATURDAY MORNING THROUGH MONDAY/. As surface high pressure builds into the region on Saturday, a dry and cool day with plenty of sunshine is expected. High temperatures will struggle to make it into the 60s in far SE GA while elsewhere, temps will be in the low to mid 50s. Overnight Saturday, a coastal trough will develop and moisture will gradually increase from southwest to northeast. Low temperatures will be in the upper 30s to lower 40s in far SE GA and along the coast where radiational cooling will not be best due to increased moisture and increasing cloud cover. Elsewhere, temperatures will be in the low to mid 30s where skies should remain clear for most of the night and winds will go calm. As high pressure shifts east on Sunday, there could be isolated to scattered light showers mainly along the GA coast and over the waters, but no accumulation is expected. High temperatures will be in the mid 50s inland and upper 50s to low 60s along the coast. With increased cloud cover on Sunday, low temperatures will be much warmer (upper 40s-mid 50s) than Saturday night. On Monday, a mid-level trough will track east across Central US. Out ahead of the trough, a warm front will lift north across the region. There could be light showers on Monday, mainly across our inland counties where the best forcing for ascent will occur. Temperatures will be much warmer, with highs in the upper 60s to mid 70s.

LONG TERM /MONDAY NIGHT THROUGH FRIDAY/. Surface low pressure will track across the mid-Atlantic states on Tuesday, eventually dragging a cold front through the local area. Models are in fairly good agreement indicating precipitation associated with the front will largely decay as it enters and moves through. Capped PoPs in the slight chance (20%) range. High pressure will briefly rebuild thereafter, before another, more potent storm system impacts the region late in the period. Warmer temperatures Tuesday will return to more seasonable levels for mid to late week.

AVIATION /00Z SATURDAY THROUGH WEDNESDAY/. CHS: While the forecast with the 00Z TAF does show prevailing VFR conditions, there is some potential for a period of MVFR or maybe even IFR conditions in fog and/or stratus late this evening and into the first part of the overnight period as skies clear. We will watch trends and amend if necessary.

KSAV: Ceilings will teeter near the low end range of the MVFR range into to IFR range this evening, before some drier air moves in. This is only temporary though, as the wet grounds and still the presence of a surface or near surface inversion will lead to the formation of fog and stratus overnight into early Saturday. VFR is forecast to return around 1330Z as considerable drier air aloft mixed down and the inversion lifts or weakens sufficiently.

Extended Aviation Outlook: VFR is expected over the weekend. Flight restrictions possible next week in showers, low clouds and fog development.

MARINE. This Evening and Tonight: A weak cold front/wind shift will approach the coastal waters late tonight, followed by cooler high pressure in its wake. Ahead of this feature, north/northwest winds should remain at or below 10 kt. The pressure gradient is then expected to tighten with the arrival of high pressure and cold air advection across local waters from the north, resulting in northerly winds increasing up to 15-20 kt late (strongest winds across northern South Carolina waters approaching daybreak). Seas will range between 1-2 ft early, then build up to 2-3 ft late.

Saturday through Wednesday: As high pressure builds in from the north, the pressure gradient will tighten and northeast winds at 15 to 20 knots expected on Saturday. While there could be occasional gusts to 25 knots, especially in the Charleston County waters. Though, have opted not to issue any Small Craft Advisories at this time. By Sunday, winds will subside a bit and another surge in winds is expected on Monday as a cold front approaches from the west. Seas will also build to 3-5 ft. Small Craft Advisories could be needed.

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



NEAR TERM . DPB SHORT TERM . LONG TERM . ETM AVIATION . DPB MARINE . DPB


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ACXS1 - ACE Basin Reserve, SC 17 mi103 min Calm 53°F 1015 hPa51°F
41033 33 mi80 min NW 5.8 G 7.8 53°F 55°F1015.4 hPa
CHTS1 44 mi58 min WSW 4.1 G 6 54°F 53°F1015.5 hPa
FBIS1 - Folly Island, SC 45 mi28 min WSW 1.9 G 2.9 52°F 1016.2 hPa (+1.1)
FPKG1 - 8670870 - Fort Pulaski, GA 45 mi58 min Calm G 1 54°F 53°F1015.9 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Beaufort, Marine Corps Air Station, SC14 mi32 minWNW 310.00 miOvercast53°F51°F93%1015.9 hPa
Walterboro Lowcountry Regional Airport, SC17 mi33 minN 010.00 miOvercast52°F50°F94%1016.3 hPa
Beaufort County Airport, SC19 mi33 minN 07.00 miOvercast52°F50°F94%1015.6 hPa

Link to 5 minute data for KNBC

Wind History from NBC (wind in knots)
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Last 24hrSW13SW9W9W5W5SW5W4NW8NW7W3NW6NW3CalmCalmCalmSW3Calm--W4S3W4W4SW3W3
1 day agoW3CalmCalmSW5CalmSW5SW4SW5SW4SW3SW4SW5SW5W5SW6SW8SW10SW11SW9W9SW12SW12SW9SW10
2 days agoS6S4S4SW5SW5SW6SW6SW4SW4SW9W10SW8W9W8W8W9
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Tide / Current Tables for Bluff Plantation, Combahee River, South Carolina
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Bluff Plantation
Click for Map
Fri -- 12:15 AM EST     0.31 feet Low Tide
Fri -- 01:57 AM EST     Moonset
Fri -- 06:42 AM EST     2.72 feet High Tide
Fri -- 07:22 AM EST     Sunrise
Fri -- 12:56 PM EST     Moonrise
Fri -- 12:57 PM EST     0.58 feet Low Tide
Fri -- 05:46 PM EST     Sunset
Fri -- 07:09 PM EST     2.44 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.40.71.21.82.32.62.72.521.510.70.60.711.51.92.32.42.321.50.9

Tide / Current Tables for Sheldon, Huspa Creek, Whale Branch, South Carolina
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Sheldon
Click for Map
Fri -- 01:57 AM EST     Moonset
Fri -- 04:48 AM EST     7.13 feet High Tide
Fri -- 07:22 AM EST     Sunrise
Fri -- 10:58 AM EST     1.22 feet Low Tide
Fri -- 12:56 PM EST     Moonrise
Fri -- 05:15 PM EST     6.41 feet High Tide
Fri -- 05:46 PM EST     Sunset
Fri -- 11:10 PM EST     0.60 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.734.55.96.97.16.55.33.92.51.61.21.62.43.64.85.96.46.25.23.82.41.20.6

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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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.