Sunday, July12, 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 6:19AMSunset 8:31PM Sunday July 12, 2020 6:15 AM EDT (10:15 UTC) Moonrise 12:00AMMoonset 12:15PM Illumination 56% Phase: Waning Gibbous; Moon at 22 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- 330 Am Edt Sun Jul 12 2020
Today..SW winds 5 kt, becoming S late.
Tonight..S winds 5 to 10 kt.
Mon..SW winds 5 to 10 kt. A chance of showers and tstms in the afternoon.
Mon night..SW winds 5 to 10 kt. A chance of tstms. A chance of showers.
Tue..SW winds 5 to 10 kt. A slight chance of tstms. A slight chance of showers.
Tue night..S winds 5 to 10 kt. A slight chance of showers and tstms in the evening.
Wed..S winds 5 to 10 kt. A slight chance of showers and tstms.
Wed night..SE winds 5 to 10 kt.
Thu..SE winds 5 to 10 kt. A chance of showers and tstms.
Thu night..SE winds 5 to 10 kt. Mariners are reminded that winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 85 degrees.
AMZ300 330 Am Edt Sun Jul 12 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A weak stationary front will linger over or near our area through early next week. High pressure is expected to return during the middle of next week and persist through late 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 120807 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 407 AM EDT Sun Jul 12 2020

SYNOPSIS. A weak stationary front will linger over or near our area through early next week. High pressure is expected to return during the middle of next week and persist through late next week.

NEAR TERM /THROUGH TONIGHT/. Mid and upper level troughing will persist across the area through tonight. A weak upper level disturbance and an associated increase in mid and upper level moisture will approach the area late tonight. In advance of this feature drying in the mid to lower portions of the atmosphere will prevail today and this combined with good mixing will enable surface dewpoints to mix out in areas away from the coast ahead of the sea breeze with afternoon dewpoint temperatures in the 60s common in these areas. So despite high temperatures in the mid to upper 90s away from the coast, lower dewpoints will keep afternoon peak heat indices in the 98 to 104 degree range. There could be a few showers and thunderstorms along and near the sea breeze across mainly the Charleston Tri-County area this afternoon into this evening where the best low level convergence will exist. Further south, cannot rule out a stray shower or thunderstorm, but believe capping and weaker convergence should preclude convective development. Any leftover convection should die off quickly this evening and feel fairly confident that upstream convection across the central and southern Appalachians will not make it to our area tonight. Lows tonight will once again range from the lower to mid 70s inland to near 80 at the coast.

SHORT TERM /MONDAY THROUGH WEDNESDAY/. Monday: The base of a mid/upper lvl trough of low pressure will gradually swing across the Mid-Atlantic and Southeast states, helping push a weak cold front into the area late in the day. Ahead of the front, moisture characterized by PWATs between 1.5-2.0 inches will advect across the region, helping support few to scattered showers/thunderstorms during peak heating hours. H5 shortwave energy aloft could maintain shower/thunderstorm activity through late evening hours, before the bulk of precip shifts offshore after midnight. Temps should remain warm given the late arrival of precip, peaking in the low/mid 90s away from the immediate beaches. Overnight lows will also remain mild, only dipping into the mid/upper 70s.

Tuesday: The axis of a mid/upper lvl trough of low pressure will be offshore while a ridge of high pressure begins to build across the Southeast United States from the west. Although precip coverage is anticipated to be less than the previous day, any lingering moisture near a stationary front/boundary could lead to few/scattered showers and thunderstorms during peak heating hours. Temps will be warm once again, peaking in the low/mid 90s for most areas. Areas well inland across Southeast Georgia could reach the upper 90s. Any convection that develops during the day will likely dissipate quickly during the evening. Conditions should remain dry overnight with mild temps in the mid/upper 70s.

Wednesday: A mid/upper lvl ridge of high pressure will extend across much of the Deep South and Southeast United States, favoring more of a typical summertime pattern as the area remains between sfc high pressure developing across the western Atlantic and a weak lee trough developing well inland. Few to scattered showers and thunderstorms are possible during peak heating hours, but should quickly diminish during the evening with the loss of daytime heating. Temps will be warm, peaking in the low/mid 90s across most areas. A few locations could peak in the upper 90s well inland.

LONG TERM /WEDNESDAY NIGHT THROUGH SATURDAY/. A mid/upper level ridge of high pressure will extend across the Southeast through much of the week with the bulk of shortwave energy passing north of the area primarily in a zonal flow aloft. A more typical summertime pattern is anticipated with few to scattered showers and thunderstorms possible during the afternoon/evening hours each day into late week. Precip coverage should slightly increase during the weekend as onshore sfc flow persists between high pressure extending across the western Atlantic and lee trough inland. High temps will be a few degrees above normal through the week, generally ranging in low/mid 90s each day (warmest inland), but could be a degree or two cooler late week as the sfc flow becomes more directly onshore. Overnight lows should remain mild, ranging in the mid/upper 70s away from the immediate coast.

AVIATION /07Z SUNDAY THROUGH THURSDAY/. 06Z TAFs: Other than perhaps a period of light fog @ KCHS between 09Z and 13Z, VFR conditions are expected with a wind shift due to the mid to late afternoon sea breeze. There is small risk for convection at or near CHS Sunday afternoon and as a result maintained VCSH from 18Z to 23Z.

Extended Aviation Outlook: Brief flight restrictions are possible at both terminals Monday afternoon/evening due to showers/thunderstorms associated with a nearby front. VFR conditions should then generally prevail at both terminals Tuesday through Thursday, but an afternoon or evening shower/thunderstorm could still result in brief flight restrictions.

MARINE. Widely scattered showers and thunderstorms across mainly the nearshore waters off the Charleston County coast early this morning should move northeast away from the area or dissipate by shortly after sunrise. With a weak low pressure area inland and Atlantic high pressure well east of the area, a generally light southwesterly to southerly flow will prevail today with winds generally at or below 10 kt, except a bit higher closer to the southeast South carolina coast associated with the sea breeze this afternoon. Seas generally expected to be 2 to 3 feet. As the pressure gradient tightens a bit tonight, winds increase into the 10 to 15 knot range and this will help seas increase to 4 feet from 10 to 20 nm of the southeast South Carolina coast and generally 4 to 5 feet across the waters 20-60 nm off the southeast Georgia coast.

Monday through Friday: A weak sfc trough of low pressure could linger near the coastal waters to start off the week, then become reinforced by a weak cold front attempting to reach the coast late Monday into Tuesday. High pressure will then generally prevail mid to late week. Given the pattern, winds/seas are expected to remain below Small Craft Advisory levels through the week. However, south- southwest winds could gust upwards to 15-20 kts at times Monday night. Thereafter, the pressure gradient remains rather week, supporting south-southeast winds no higher than 10-15 kt. Seas will range between 3-5 ft early week, then subside to 2-3 ft during the middle of the week.

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

NEAR TERM . MTE SHORT TERM . DPB LONG TERM . DPB AVIATION . DPB/MTE MARINE . DPB/MTE


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 0 mi45 min SW 2.9 G 4.1 82°F 85°F1009.9 hPa
FBIS1 - Folly Island, SC 7 mi75 min S 8 G 8 83°F 1009.8 hPa (-1.5)
41029 - Capers Nearshore (CAP 2) 16 mi127 min SW 14 G 21 84°F 85°F1009.9 hPa
ACXS1 - ACE Basin Reserve, SC 32 mi90 min Calm 78°F 1010 hPa78°F
41033 43 mi67 min W 5.8 G 7.8 84°F 84°F1009.1 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 48 mi35 min WSW 9.7 G 12 83°F 84°F1009.7 hPa76°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC7 mi20 minN 05.00 miFog/Mist79°F78°F100%1010.2 hPa
Charleston, Charleston Air Force Base, SC10 mi79 minSSW 39.00 miA Few Clouds80°F78°F94%1009.1 hPa
Mount Pleasant Regional-Faison Field, SC11 mi20 minN 05.00 miFog/Mist79°F78°F100%1009.8 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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Last 24hrCalmSW3W544Calm4S7SE6S113SW8S11S7S6S4SW4CalmS4CalmCalmS3SE5Calm
1 day agoCalmNW4W3NW4W5NW4NW75
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2 days agoCalmNW5NW5N6NW5CalmN6N7W6W44S6S7SW3SW7W4SW5W4CalmCalmW4W3CalmCalm

Tide / Current Tables for Charleston, South Carolina
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Charleston
Click for Map
Sun -- 12:49 AM EDT     Moonrise
Sun -- 01:43 AM EDT     4.82 feet High Tide
Sun -- 06:21 AM EDT     Sunrise
Sun -- 07:59 AM EDT     0.61 feet Low Tide
Sun -- 01:15 PM EDT     Moonset
Sun -- 02:16 PM EDT     4.74 feet High Tide
Sun -- 07:31 PM EDT     Last Quarter
Sun -- 08:22 PM EDT     1.23 feet Low Tide
Sun -- 08:29 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.34.74.84.43.62.61.60.90.60.91.82.83.74.44.74.64.13.22.41.71.31.31.92.8

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Sun -- 12:49 AM EDT     Moonrise
Sun -- 01:59 AM EDT     -0.00 knots Slack
Sun -- 05:31 AM EDT     -1.73 knots Max Ebb
Sun -- 06:20 AM EDT     Sunrise
Sun -- 08:44 AM EDT     0.00 knots Slack
Sun -- 11:02 AM EDT     1.34 knots Max Flood
Sun -- 01:15 PM EDT     Moonset
Sun -- 02:37 PM EDT     -0.00 knots Slack
Sun -- 06:00 PM EDT     -1.53 knots Max Ebb
Sun -- 07:31 PM EDT     Last Quarter
Sun -- 08:29 PM EDT     Sunset
Sun -- 09:17 PM EDT     0.00 knots Slack
Sun -- 11:25 PM EDT     1.09 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.5-0-0.7-1.3-1.7-1.7-1.2-0.60.211.31.10.80.4-0.3-0.9-1.4-1.5-1.3-0.8-0.20.51

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