Wednesday, July8, 2020
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Marine Weather and Tides
Folly Beach, 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 6:17AMSunset 8:32PM Wednesday July 8, 2020 4:08 AM EDT (08:08 UTC) Moonrise 10:21PMMoonset 8:32AM Illumination 92% Phase: Waning Gibbous; Moon at 18 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- 336 Am Edt Wed Jul 8 2020
Today..W winds 5 to 10 kt, becoming sw 10 to 15 kt. Showers likely with a chance of tstms this morning, then showers and tstms this afternoon.
Tonight..SW winds 10 to 15 kt, becoming W 5 to 10 kt after midnight. Showers and tstms likely, mainly in the evening.
Thu..NW winds 5 to 10 kt, becoming W in the afternoon. A slight chance of showers and tstms in the morning, then showers and tstms likely in the afternoon.
Thu night..W winds 5 to 10 kt. A chance of showers and tstms.
Fri..NW winds 5 kt, becoming sw in the afternoon. A slight chance of showers and tstms in the morning, then a chance of showers and tstms in the afternoon.
Fri night..SW winds 5 to 10 kt. A chance of showers and tstms.
Sat..SW winds 5 to 10 kt. A chance of showers and tstms.
Sat night..SW winds 5 to 10 kt. A chance of showers and tstms.
Sun..SW winds 5 to 10 kt. A chance of showers and tstms.
Sun night..SW winds 10 kt. A 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 84 degrees.
AMZ300 336 Am Edt Wed Jul 8 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. An area of low pressure will slowly drift toward the carolina coast today, before lifting northeast tonight and Thursday. A trough of low pressure will then linger over the area through early next week.


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 080802 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 402 AM EDT Wed Jul 8 2020

SYNOPSIS. An area of low pressure will slowly drift toward the Carolina coast today, before lifting northeast tonight and Thursday. A trough of low pressure will then linger over the area through early next week.

NEAR TERM /THROUGH TONIGHT/. Through early this morning, expect isolated/scattered showers and perhaps an isolated thunderstorm as broad low pressure interacts with a very moist environment featuring PWAT values well above 2 inches.

Today: Expect another active day featuring numerous/widespread showers/thunderstorms as broad surface low pressure gradually advances east across the region and an associated trough persists aloft. Within this cyclonic flow regime, diurnal warming of a very moist air mass should readily support convection, initially across northern/inland counties by later morning/midday then spreading into southern counties this afternoon.

With the exception of northern counties, some high resolution guidance suggests that coverage of showers/thunderstorms could be less than indicated within the latest forecast across southern/inland counties. Will continue to assess PoPs.

Locally heavy rainfall is possible in any thunderstorms, particularly where greatest coverage is expected across northern counties. The probability for isolated pulse severe thunderstorms with damaging wind gusts should remain low.

Where showers/thunderstorms develop earliest and persist longest, temperatures will top out in the lower 80s. Where longer periods of rain-free conditions occur, temperatures should recover into the middle/upper 80s.

Tonight: Showers/thunderstorms will linger into the evening, with greatest/most persistent coverage across northern counties. With diurnal stabilization and as the surface low/associated upper low shift north/northeast of the region, coverage of convection should diminish with time. After midnight, residual slight chance PoPs should retreat into northern counties, closest to the deep layered low pressure.

SHORT TERM /THURSDAY THROUGH SATURDAY/. An area of low pressure located near the Carolina coast at the start of the period will slowly lift northward Thursday and Thursday night. A front extending south from the low will linger over or near the area through the day. Aloft, broad troughing will prevail with shortwave energy progged to pass through. These features will combine with PWats over 2 inches to support scattered to numerous showers and thunderstorms, mainly in the afternoon and evening. The threat for severe weather is low. High temperatures will peak around 90 across most locations, with lows Thursday night mainly in the middle 70s.

The surface low will continue to lift away from the area late week, eventually merging with another system moving into the Northeast on Saturday. A stalled front associated with the departing low will linger over the region. Meanwhile, the mid level trough over the eastern CONUS will become more amplified with time as a stronger shortwave moves in. Continued deep moisture in place will keep rain chances in the forecast each day, although coverage is not expected to be as high as previous days. Temperatures will be slightly above normal.

LONG TERM /SATURDAY NIGHT THROUGH TUESDAY/. A mid level trough will persist over the eastern U.S. through the period. At the surface, troughing will prevail. This pattern will generally favor at least scattered showers and thunderstorms each day, with coverage peaking in the afternoon and evening. Temperatures are expected to be around normal.

AVIATION /08Z WEDNESDAY THROUGH SUNDAY/. Given ample low level moisture, EXPECT MVFR/IFR ceilings until 13-15z this morning. Then, prevailing VFR conditions should develop Wednesday morning through the remainder of the 6z TAF period. However, expect flight restrictions associated with showers/thunderstorms Wednesday afternoon/evening, with greatest coverage likely in the KCHS vicinity. Due to lingering uncertainty regarding precise timing, maintained VCTS and will continue to assess.

Extended Aviation Outlook: Brief flight restrictions possible, mainly during the afternoon and evening due to showers and thunderstorms.

MARINE. Today and tonight: Southwest winds 10-15 knots today will turn to the west tonight as surface low pressure tracks just north of the waters. Seas will average 2-4 feet, highest beyond 20 nm. Scattered/numerous thunderstorms will also produce locally hazardous conditions.

Thursday through Monday: Low pressure will slowly lift northward away from the area through late week. A trough of low pressure will then linger in the vicinity over the weekend and early next week. Predominantly southwest to occasionally west winds are expected to prevail, with conditions forecast to remain below Small Craft Advisory criteria through the period.

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

NEAR TERM . SPR SHORT TERM . ETM LONG TERM . ETM AVIATION . ETM/SPR MARINE . ETM/SPR


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 2 mi68 min WSW 5.1 G 7 78°F 1012.6 hPa (-1.4)
CHTS1 8 mi50 min SW 4.1 G 5.1 78°F 84°F1012.2 hPa
41029 - Capers Nearshore (CAP 2) 19 mi60 min W 12 G 18 81°F 83°F1012 hPa
ACXS1 - ACE Basin Reserve, SC 29 mi83 min Calm 77°F 1013 hPa76°F
41033 37 mi60 min W 16 G 21 80°F 82°F1011.8 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 45 mi148 min SW 19 G 25 79°F 1013 hPa76°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC5 mi73 minSW 5 mi77°F77°F100%1012.2 hPa
Charleston, Charleston Air Force Base, SC18 mi72 minN 010.00 miMostly Cloudy76°F75°F97%1012 hPa
Mount Pleasant Regional-Faison Field, SC18 mi73 minN 02.00 miFog/Mist75°F75°F100%1012.2 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmE3E4E4E5SE7E6SE5S7S4S7SW7
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CalmSW4CalmCalmCalmCalmSW4SW4
1 day agoCalmCalmCalmCalmCalmS4S4S4S4SE6
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2 days agoCalmCalmCalmCalmCalmSE35E3SE5E8E7SE7E8E10E7
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Tide / Current Tables for Folly Beach, Folly River bridge, Folly Island, South Carolina
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Folly Beach
Click for Map
Wed -- 04:59 AM EDT     0.14 feet Low Tide
Wed -- 06:19 AM EDT     Sunrise
Wed -- 09:33 AM EDT     Moonset
Wed -- 11:29 AM EDT     4.87 feet High Tide
Wed -- 05:00 PM EDT     0.30 feet Low Tide
Wed -- 08:30 PM EDT     Sunset
Wed -- 11:21 PM EDT     Moonrise
Wed -- 11:55 PM EDT     5.73 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.84.83.41.80.60.10.51.42.53.64.34.84.84.131.70.70.30.61.62.73.94.95.5

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Wed -- 02:34 AM EDT     -2.56 knots Max Ebb
Wed -- 05:42 AM EDT     0.00 knots Slack
Wed -- 06:18 AM EDT     Sunrise
Wed -- 07:47 AM EDT     1.43 knots Max Flood
Wed -- 09:32 AM EDT     Moonset
Wed -- 11:29 AM EDT     -0.00 knots Slack
Wed -- 02:44 PM EDT     -1.93 knots Max Ebb
Wed -- 05:48 PM EDT     0.00 knots Slack
Wed -- 08:11 PM EDT     1.43 knots Max Flood
Wed -- 08:30 PM EDT     Sunset
Wed -- 11:20 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.7-1.7-2.4-2.5-1.8-0.80.31.21.41.20.90.4-0.4-1.2-1.8-1.9-1.5-0.70.211.41.31.10.8

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 (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.