Friday, December6, 2019
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Marine Weather and Tides
Folly Beach, SC

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:06AMSunset 5:14PM Friday December 6, 2019 4:05 PM EST (21:05 UTC) Moonrise 2:11PMMoonset 1:42AM Illumination 75% 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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AMZ330 Charleston Harbor- 325 Pm Est Fri Dec 6 2019
Tonight..N winds 5 kt. A chance of showers this evening.
Sat..NE winds 10 to 15 kt with gusts to 20 kt.
Sat night..NE winds 15 kt with gusts to 20 kt.
Sun..NE winds 15 to 20 kt. Waves 1 to 2 ft. A slight chance of showers in the afternoon.
Sun night..NE winds 10 to 15 kt with gusts to 20 kt, becoming E 5 to 10 kt after midnight. A chance of showers.
Mon..S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts to 20 kt in the afternoon. A slight chance of showers.
Mon night..SW winds 10 to 15 kt.
Tue..SW winds 10 to 15 kt. A slight chance of showers.
Tue night..W winds 10 to 15 kt. A chance of showers.
Wed..N winds 10 to 15 kt. A slight chance of showers.
Wed night..N winds 10 to 15 kt. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 57 degrees.
AMZ300 325 Pm Est Fri Dec 6 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A weak disturbance will move through today. High pressure will build from the northwest tonight through Sunday. A warm front will lift north of the region Monday, before a cold front sweeps through the area late Tuesday. Strong high pressure will then return Wednesday through Friday.


7 Day Forecast for Marine Location Near Folly Beach, SC
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location: 32.66, -79.92     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 062040 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 340 PM EST Fri Dec 6 2019

SYNOPSIS. A weak disturbance will move through today. High pressure will build from the northwest tonight through Sunday. A warm front will lift north of the region Monday, before a cold front sweeps through the area late Tuesday. Strong high pressure will then return Wednesday through Friday.

NEAR TERM /UNTIL 6 AM SATURDAY MORNING/. This Evening: A mid-level short wave will move overhead while deamplifying. Closer to the surface, lift associated with this feature combined with a plume of PWATs stretching from the ocean towards the Charleston Tri-County area will lead to scattered showers in the evening. Models are in good agreement showing the "heaviest" precipitation early, with both intensity and areal coverage decreasing as the evening progresses. QPF should generally be <0.01".

Tonight: The mid-level wave will quickly shift offshore. At the surface, a weak cold front will approach from the north. Though, models have it weakening/dissipating as it crosses through our area. What may end up being more noticeably is surface high pressure building behind the front late tonight. Clouds should generally decrease, especially late. Temperatures may be somewhat tricky, depending partly on the cloud cover. Lows should generally be in the 40s.

SHORT TERM /6 AM SATURDAY MORNING THROUGH MONDAY/. Dry high pressure will expand across the area from the northwest on Saturday. The upper shortwave will be far enough east initially to keep any inverted trough development well off the coast. Therefore we do not anticipate any precipitation Saturday.

A secondary shortwave will move into the Southeast Saturday night and Sunday. The surface ridge will shift farther to the east, pushing an inverted trough closer to the coast before it lifts north Sunday night and Monday. A few rain showers could skirt through northern areas Sunday night and Monday though most areas will remain dry. A warm front will lift north on Monday.

Temps in the 60s Saturday and Sunday will warm well into the 70s on Monday as a southerly flow develops.

LONG TERM /MONDAY NIGHT THROUGH FRIDAY/. The mid and upper trough will amplify to our west early next week, allowing for a cold front to approach from the west late Tuesday, which will likely pass through Tuesday night. There remain enough timing differences between the global models to not show anything higher than chance PoP ahead of the front, but higher chances will be required at we draw closer to the event. Any t-storm risk is too low to include this far in advance. Confidence is excellent that it'll be unseasonably warm, with H85 temps as great as 12-13C Tuesday.

Behind the cold front a large and robust high pressure system with dry and colder weather will dominate the local vicinity Wednesday and Thursday, before it gives way to another upstream cold front late in the week. An extended period of breezy to windy conditions will prevail through the period with large pressure rises and a tight gradient around the high.

AVIATION /21Z FRIDAY THROUGH WEDNESDAY/. 18Z TAFs: CHS: Radar shows light showers around the terminal. We're maintaining mention of this in the TAF through this evening. The probabilities of MVFR during this time period remains low. Conditions improve later this evening, with VFR expected, prevailing through Saturday.

SAV: Light showers could approach the terminal into early this evening. However, the probabilities of any flight restrictions are too low to mention in the TAF, so we are maintaining VFR.

Extended Aviation Outlook: Overnight stratus will be possible Sunday night through Wednesday night, possibly resulting in flight restrictions.

MARINE. Tonight: Initially, their won't be much of a pressure gradient across the waters, which will lead to light and variable winds. However, later tonight, high pressure building in from the north should increase the pressure gradient, causing winds to turn to the north and increase to around 10 kt. Seas initially 1-2 ft could build a foot by daybreak Saturday.

A pinched northeast gradient on Saturday will result in the onset of Small Craft Advisory conditions for all Atlantic waters outside Charleston Harbor. We have SCA headlines beginning at varying times Saturday or Saturday night. Conditions will improve late Sunday across the nearshore waters due to a warm front lifting through and southerly flow returning. SCA conditions will persist over the offshore GA waters through much of next week due to a combination of winds/seas.

Sea Fog: Conditions still point to at least a chance of sea fog on Monday as temps and dew points climb greater than the underlying waters. Should this occur the most likely time frame would be Monday within a favorable S-SW fetch and before winds increase too much. Confidence is not yet supportive of adding mention to the forecast, nor to the Hazardous Weather Outlook.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory from 6 PM Saturday to 5 PM EST Sunday for AMZ352-354. Small Craft Advisory from 8 AM Saturday to 6 AM EST Thursday for AMZ374. Small Craft Advisory from 8 AM Saturday to 5 PM EST Sunday for AMZ350.

NEAR TERM . SHORT TERM . JRL LONG TERM . AVIATION . JRL MARINE . JRL


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 2 mi66 min NNE 2.9 G 4.1 59°F 1021.6 hPa (-1.2)56°F
CHTS1 8 mi54 min Calm G 1.9 66°F 57°F1021.5 hPa
41029 - Capers Nearshore (CAP 2) 19 mi58 min E 5.8 G 7.8 59°F 58°F1021.7 hPa
ACXS1 - ACE Basin Reserve, SC 29 mi81 min Calm 64°F 1021 hPa59°F
41033 37 mi58 min N 5.8 G 7.8 59°F 59°F1021.9 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 45 mi26 min 7.8 G 12 73°F1020.4 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC5 mi71 minN 010.00 miPartly Cloudy66°F51°F60%1021.3 hPa
Charleston, Charleston Air Force Base, SC18 mi70 minWSW 94.00 miLight Rain63°F55°F76%1021.4 hPa
Mount Pleasant Regional-Faison Field, SC18 mi71 minN 010.00 miPartly Cloudy66°F51°F60%1021 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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Last 24hr------CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNE5E55E4E5Calm
1 day ago------------------------------------------------
2 days ago------------------------------------------------

Tide / Current Tables for Folly Beach, Folly River bridge, Folly Island, South Carolina
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Folly Beach
Click for Map
Fri -- 01:41 AM EST     Moonset
Fri -- 03:26 AM EST     4.83 feet High Tide
Fri -- 07:07 AM EST     Sunrise
Fri -- 09:15 AM EST     1.10 feet Low Tide
Fri -- 02:10 PM EST     Moonrise
Fri -- 03:50 PM EST     4.90 feet High Tide
Fri -- 05:13 PM EST     Sunset
Fri -- 09:41 PM EST     0.65 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.93.84.44.84.74.23.32.41.61.11.31.92.73.64.34.84.94.53.72.61.60.80.71.2

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Fri -- 01:41 AM EST     Moonset
Fri -- 03:28 AM EST     -0.00 knots Slack
Fri -- 06:56 AM EST     -1.51 knots Max Ebb
Fri -- 07:07 AM EST     Sunrise
Fri -- 10:06 AM EST     0.00 knots Slack
Fri -- 12:13 PM EST     1.14 knots Max Flood
Fri -- 02:10 PM EST     Moonrise
Fri -- 03:48 PM EST     -0.00 knots Slack
Fri -- 05:13 PM EST     Sunset
Fri -- 07:20 PM EST     -1.74 knots Max Ebb
Fri -- 10:27 PM EST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.310.70.3-0.4-0.9-1.3-1.5-1.3-0.8-0.10.71.110.80.5-0.1-0.8-1.4-1.7-1.6-1.1-0.40.5

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (16,3,4,5)
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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 numerious 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.