Tuesday, January21, 2020
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Marine Weather and Tides
Charleston, SC

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 7:19AMSunset 5:42PM Tuesday January 21, 2020 12:44 AM EST (05:44 UTC) Moonrise 4:32AMMoonset 2:54PM Illumination 16% Phase: Waning Crescent; Moon at 26 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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AMZ330 Charleston Harbor- 948 Pm Est Mon Jan 20 2020
Overnight..NE winds 15 kt.
Tue..N winds 15 to 20 kt. Waves 1 to 2 ft.
Tue night..N winds 15 to 20 kt with gusts to 25 kt. Waves 1 to 2 ft.
Wed..N winds 15 kt with gusts to 20 kt.
Wed night..NE winds 10 to 15 kt.
Thu..NE winds 10 kt.
Thu night..NE winds 5 to 10 kt. A chance of showers.
Fri..E winds 5 to 10 kt. A chance of showers.
Fri night..S winds 5 to 10 kt. Showers likely.
Sat..W winds 10 kt. A slight chance of showers.
Sat night..W winds 10 kt. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 58 degrees.
AMZ300 948 Pm 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 Charleston, SC
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location: 32.78, -79.93     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 210407 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1107 PM 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 /UNTIL 6 AM TUESDAY MORNING/. The max temps for Monday at North Charleston and in downtown Charleston were the coldest they have been since last January. Savannah had it's coldest max temp since November 2019.

Meanwhile, our forecast of the low temperature for downtown Charleston tonight to 28 degrees, which will be the first time that freezing temperatures have been observed since 1/18/2018. In addition, the forecast lows for North Charleston and Savannah will be the coldest temperatures since 1/19/2018.

Conditions still appear too marginal for a Wind Chill Advisory for Charleston and Tidal Berkeley late tonight into Tuesday morning. While there will be some wind chills down near 15 degrees, the coverage is and duration is not enough to warrant the advisory.

Instead we issued a Special Weather Statement, not just for those two areas, but for all counties, as wind chills will be down in the mid and upper teens across many areas from 5-9 am.

In addition, temps tonight into Tuesday morning will be 32F or colder for about 7-12 hours across a good chunk of the forecast area.

SHORT TERM /6 AM TUESDAY MORNING THROUGH THURSDAY/. Chilly high pressure will remain the dominant feature at the surface through Thursday. Aloft, a strong mid level low will swing off the Southeast coast on Tuesday, with heights gradually rising in its wake. Deep dry air will preclude any rain, so the most notable feature of the short term will be the temperatures.

The coldest day of the set will be Tuesday when highs only reach the low to mid 40s, then temperatures will slowly moderate through Thursday (although each day will still be below normal). Lows Tuesday night are forecast to range from the mid 20s inland to around freezing at the immediate coast. There will be a decent amount of wind present with an enhanced pressure gradient, so this will make it feel like the upper teens. These values remain shy of Wind Chill Advisory criteria. Wednesday night lows will drop to the 30s.

Lake Winds: Cold air moving over the warmer lake waters Tuesday night into Wednesday will promote favorable mixing profiles. North winds could gust to near 25 knots, and a Lake Wind Advisory could be needed.

LONG TERM /THURSDAY NIGHT THROUGH MONDAY/. 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 /03Z TUESDAY THROUGH SATURDAY/. VFR at KCHS and KSAV through 00Z Wednesday. Models show a brief period of SCT to BKN ceilings and an increase in wind speed beginning 15Z Tue which are noted in the TAFs.

Extended Aviation Outlook: VFR is expected through late week. Flight restrictions are possible during the weekend due to showers and low clouds associated with a passing cold front.

MARINE. The marine area will remain between organizing low pressure over the western Atlantic and high pressure centered over the mid-Mississippi River valley. The pressure gradient across the waters should support steady N and NE winds between 15 to 20 kts, a little less in Charleston Harbor. Winds will be a little stronger across the outer GA waters, AMZ374, supporting gusts to 25 kts. Seas are forecast to range from 3 to 4 ft across the nearshore waters to 5 to 6 ft across the outer GA waters. A Small Craft Advisory will remain in effect for AMZ374.

Tuesday through Saturday: North winds will strengthen on Tuesday as the pressure gradient tightens between high pressure inland and developing low pressure offshore. Small Craft Advisories will go into effect for all waters in the morning. There is currently no advisory for the Charleston Harbor in effect, but it will most likely need one at some point later in the day. The worst conditions are forecast to occur Tuesday night into Wednesday, and we have hoisted Gale Watches for the Charleston County nearshore waters and outer Georgia waters. Some improvement is expected Wednesday night into Thursday, but conditions will still be supportive of Small Craft Advisories through Thursday. Winds and seas will 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 7.0-7.3 FT MLLW along the Southeast South Carolina coast during the Wednesday and Thursday morning high tides and a Coastal Flood Advisory could eventually be needed.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory from 10 AM Tuesday to 7 PM EST Thursday for AMZ352-354. Gale Watch from Tuesday afternoon through Wednesday afternoon for AMZ374. Small Craft Advisory until 4 PM EST Tuesday for AMZ374. Gale Watch from Tuesday evening through Wednesday afternoon for AMZ350. Small Craft Advisory from 7 AM to 7 PM EST Tuesday for AMZ350.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 0 mi63 min 39°F 57°F1027.4 hPa
FBIS1 - Folly Island, SC 7 mi45 min NNE 16 G 20 38°F 1027.2 hPa (-0.7)24°F
41029 - Capers Nearshore (CAP 2) 16 mi97 min NE 19 G 27 41°F 58°F1027.8 hPa
ACXS1 - ACE Basin Reserve, SC 32 mi120 min N 1.9 34°F 1028 hPa25°F
41033 43 mi97 min NE 16 G 21 41°F 56°F1028 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 48 mi45 min 18 G 23 66°F1025.2 hPa (-1.1)

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC7 mi50 minN 010.00 miA Few Clouds36°F21°F56%1027.1 hPa
Charleston, Charleston Air Force Base, SC10 mi49 minNNE 710.00 miFair32°F21°F66%1027.4 hPa
Mount Pleasant Regional-Faison Field, SC11 mi50 minN 010.00 miMostly Cloudy32°F23°F69%1027.4 hPa

Link to 5 minute data for KCHS

Wind History from CHS (wind in knots)
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2 days agoNE6NE7NE10NE10NE8NE9NE7NE7NE8NE8NE9E8SE4S7S9S11S10SW7S7SW3SW6SW9SW12SW11
G18

Tide / Current Tables for Charleston, South Carolina
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Charleston
Click for Map
Tue -- 04:31 AM EST     Moonrise
Tue -- 05:15 AM EST     5.74 feet High Tide
Tue -- 07:20 AM EST     Sunrise
Tue -- 11:26 AM EST     0.10 feet Low Tide
Tue -- 02:54 PM EST     Moonset
Tue -- 05:26 PM EST     4.62 feet High Tide
Tue -- 05:41 PM EST     Sunset
Tue -- 11:33 PM EST     -0.34 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.41.62.94.25.25.75.64.83.62.20.90.20.20.923.144.64.53.92.91.70.6-0.2

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Tue -- 01:47 AM EST     1.48 knots Max Flood
Tue -- 02:39 AM EST     1.47 knots Min Flood
Tue -- 03:02 AM EST     1.47 knots Max Flood
Tue -- 04:31 AM EST     Moonrise
Tue -- 05:49 AM EST     -0.00 knots Slack
Tue -- 07:20 AM EST     Sunrise
Tue -- 08:52 AM EST     -2.54 knots Max Ebb
Tue -- 11:55 AM EST     0.00 knots Slack
Tue -- 01:51 PM EST     1.28 knots Max Flood
Tue -- 02:54 PM EST     Moonset
Tue -- 05:41 PM EST     Sunset
Tue -- 05:46 PM EST     -0.00 knots Slack
Tue -- 09:08 PM EST     -2.11 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.81.41.51.51.40.8-0.2-1.3-2.2-2.5-2.1-1.10.111.31.10.90.5-0.2-1-1.7-2.1-1.9-1.2

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (0,6,7,8)
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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.