Wednesday, July15, 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 6:21AMSunset 8:29PM Wednesday July 15, 2020 4:44 AM EDT (08:44 UTC) Moonrise 1:17AMMoonset 3:00PM Illumination 25% 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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AMZ330 Charleston Harbor- 321 Am Edt Wed Jul 15 2020
Today..Variable winds 5 kt early, becoming E 5 to 10 kt, then se 10 to 15 kt this afternoon.
Tonight..E winds 10 kt.
Thu..E winds 10 kt. A slight chance of showers and tstms in the afternoon.
Thu night..E winds 5 to 10 kt.
Fri..E winds 5 to 10 kt. A slight chance of showers and tstms.
Fri night..S winds 5 kt. A slight chance of showers and tstms in the evening.
Sat..SE winds 5 to 10 kt. A slight chance of showers and tstms.
Sat night..S winds 5 to 10 kt.
Sun..S winds 5 to 10 kt. A slight chance of showers and tstms.
Sun night..S winds 5 to 10 kt. A slight chance of showers and tstms. Mariners are reminded that winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 86 degrees.
AMZ300 321 Am Edt Wed Jul 15 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A weak front will linger in the vicinity today. Atlantic high pressure should then prevail through 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 150755 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 355 AM EDT Wed Jul 15 2020

SYNOPSIS. A weak front will linger in the vicinity today. Atlantic high pressure should then prevail through early next week.

NEAR TERM /THROUGH TONIGHT/. Pre-dawn: Other than a little ground fog where it rained yesterday evening, no sensible weather will be found as we begin the day with temps at least a few degrees above normal.

Today: A solid mid and upper level anticyclone will cover much of the southern tier of the country, including the Southeast and local area. Simultaneously at the surface we find high pressure building southward out of New England, while a subtle low and weak front to lie over the region. That front and the sea breeze boundary will be the mechanisms for any convection that occurs this afternoon. But given large scale subsidence under the ridging aloft, moisture confined generally in the 850-700 mb layer, and only modest instability and CAPE, we don't expect anything more than isolated coverage of showers and t-storms after 1 or 2 pm.

In spite of the limited amount of convection, given the mid level dry air, DCAPE will be around 1500 J/kg. This could be enough for strong to perhaps marginally severe wind gusts in any of the t-storms that form.

Although 850 mb temps are similar to Tuesday, since low level thickness is a tad lower and the boundary layer flow becomes east-southeast, we expect max temps a bit less than yesterday. We have mid and upper 90s inland from US-17, with coastal sections generally at or below 90F. Associated heat indices will peak at 103-108F in the afternoon, which is shy of the Heat Advisory criteria for this time of year.

Tonight: Ridging will persist aloft, as the New England high continues to build across the local vicinity and Southeast. Isolated evening convection inland from I-95 will quickly fade with sunset, and the rest of the night is forecast to be rainfree. With a continued onshore low level flow, maybe a few showers will form over the Gulf Stream and head toward the coast. For now though we have PoP held to 10% or less.

Conditions could favor a little fog and/or stratus across locations from Allendale to Tattnall County late, the combination of any wet grounds and the upslope flow across the far interior "higher" terrain.

Min temps will average in the lower and middle 70s inland from US-17, with upper 70s to near 80F along the barrier islands and in downtown Charleston.

SHORT TERM /THURSDAY THROUGH SATURDAY/. A weak front will likely dissipate across the region by daybreak Thursday and be followed by a more typical summertime pattern into the weekend. In general, a mid/upper lvl ridge of high pressure will extend across much of the Deep South and Southeast United States while sfc high pressure develops across the western Atlantic and weak lee troughing develops inland. A few showers and/or thunderstorms will be possible Thursday afternoon and Friday afternoon, mainly associated with an inland moving seabreeze circulation. Any convection during the day will quickly dissipate with diurnal heat loss shortly after sunset. By Saturday, few to scattered showers and thunderstorms will be possible, with greatest precip coverage occurring across southern most zones along the southern periphery of the Atlantic high. Again, convection will likely dissipate quickly during the evening with diurnal heat loss. Temps will remain warm each day under ridging aloft and sufficient sfc heating in place. In general, highs will range in the low/mid 90s, warmest well inland across Southeast Georgia. Overnight lows will be mild, ranging in the low/mid 70s inland to upper 70s/around 80 near the coast.

LONG TERM /SATURDAY NIGHT THROUGH TUESDAY/. A mid/upper level ridge of high pressure will persist across the Southeast through at least the weekend with the bulk of shortwave energy passing north of the area within a broad zonal flow. A more typical summertime pattern is anticipated with few to scattered showers/thunderstorms possible Sunday afternoon/evening. Precip coverage should then slightly increase early next week as weak h5 shortwave energy enters the area while an onshore sfc flow persists between sfc high pressure extending across the western Atlantic and lee trough inland. Greatest precip coverage should occur during the middle of next week as h5 shortwave energy persists along a base of a broad trough of low pressure. High temps will be a few degrees above normal to start off the week (low/mid 90s), but should be a degree or two cooler heading into the middle of next week as onshore sfc flow remains in place and precip coverage increases. Overnight lows should remain mild, ranging in the mid/upper 70s away from the immediate coast.

AVIATION /08Z WEDNESDAY THROUGH SUNDAY/. VFR will prevail with the 06Z TAFs.

There could be a little ground fog at KCHS until about 11-12Z due to the rainfall Tuesday evening.

Isolated SHRA/TSRA will occur after 18-19Z along the sea breeze and a weak front across the area. Since any possible impacts at either KCHS or KSAV are so low, there is no need to include at this time.

Extended Aviation Outlook: VFR conditions will likely prevail at both terminals through into the weekend, but brief flight restrictions are possible during afternoon/evening showers and/or thunderstorms, late weekend into early next week.

MARINE. Today and tonight: A weak front across the area today will dissipate by late tonight, as high pressure builds from the N-NE and merges with high pressure already in the eastern Gulf of Mexico. Winds all waters will gradually become E and SE today, then mostly E tonight. On average winds will be no more than about 10-15 kt, with seas just 2 feet (occasionally 3 ft on the outer Georgia waters).

Thursday through Monday: A weak front will likely dissipate near the region by daybreak Thursday. Atlantic high pressure will then prevail this weekend and into early next week. Given the weak pressure gradient pattern, winds/seas are expected to remain well below Small Craft Advisory levels. In general, east-southeast winds during the week should gradually become south-southeast late weekend and persist into early next week, peaking no higher than 10-15 kt. Seas will be no higher than 2-3 ft.

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

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 0 mi75 min 86°F
FBIS1 - Folly Island, SC 7 mi105 min WSW 2.9 G 4.1 83°F 1016.6 hPa (-1.4)
41029 - Capers Nearshore (CAP 2) 16 mi97 min W 3.9 G 9.7 84°F 84°F1016 hPa
ACXS1 - ACE Basin Reserve, SC 32 mi120 min Calm 80°F 1016 hPa78°F
41033 43 mi97 min SW 7.8 G 12 84°F 84°F1015.6 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 48 mi45 min WSW 3.9 G 5.8 84°F 1016.2 hPa (-0.6)77°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC7 mi50 minN 05.00 miFog/Mist79°F78°F100%1015.9 hPa
Charleston, Charleston Air Force Base, SC10 mi49 minN 08.00 miShallow Fog78°F75°F93%1015.8 hPa
Mount Pleasant Regional-Faison Field, SC11 mi50 minN 05.00 miFog/Mist77°F77°F100%1015.9 hPa

Link to 5 minute data for KCHS

Wind History from CHS (wind in knots)
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Last 24hrW3NE5CalmCalm3N6N4NW5W4W4N6SE10S10SE9S4SW6SE4SE3CalmCalmS3S3CalmCalm
1 day agoS6S7S6SW6SW6SW8SW7S11S10S9SW12S10S12SW12S10S6E123CalmCalmSW5CalmS3Calm
2 days agoSW3CalmCalmS3--Calm3W9
G16
NW7NW66S7SW11S10S10SW9S8S7S6S7S7SW7S5SW4

Tide / Current Tables for Charleston, South Carolina
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Charleston
Click for Map
Wed -- 02:16 AM EDT     Moonrise
Wed -- 04:13 AM EDT     4.38 feet High Tide
Wed -- 06:22 AM EDT     Sunrise
Wed -- 10:29 AM EDT     0.58 feet Low Tide
Wed -- 04:00 PM EDT     Moonset
Wed -- 04:51 PM EDT     5.22 feet High Tide
Wed -- 08:28 PM EDT     Sunset
Wed -- 11:15 PM EDT     1.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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22.83.54.14.44.33.72.921.20.70.71.32.43.54.455.24.94.23.22.31.51.1

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Wed -- 01:06 AM EDT     1.07 knots Max Flood
Wed -- 02:16 AM EDT     Moonrise
Wed -- 04:19 AM EDT     -0.00 knots Slack
Wed -- 06:22 AM EDT     Sunrise
Wed -- 07:58 AM EDT     -1.60 knots Max Ebb
Wed -- 11:05 AM EDT     0.00 knots Slack
Wed -- 01:32 PM EDT     1.46 knots Max Flood
Wed -- 04:00 PM EDT     Moonset
Wed -- 05:16 PM EDT     -0.00 knots Slack
Wed -- 08:28 PM EDT     Sunset
Wed -- 08:44 PM EDT     -1.82 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.71.10.90.50.2-0.4-1-1.4-1.6-1.4-0.8-0.10.71.41.41.10.80.2-0.6-1.2-1.7-1.8-1.4-0.8

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (4,6,7,8)
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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.