Sunday, January24, 2021
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Marine Weather and Tides
Folly Beach, SC

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:17AMSunset 5:46PM Sunday January 24, 2021 4:31 AM EST (09:31 UTC) Moonrise 2:08PMMoonset 3:47AM Illumination 84% Phase: Waxing Gibbous; Moon at 11 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- 311 Am Est Sun Jan 24 2021
Today..E winds 10 kt.
Tonight..E winds 5 to 10 kt, becoming se after midnight.
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 with gusts to 20 kt. A slight chance of showers.
Tue night..SW winds 5 to 10 kt. A chance of showers.
Wed..NE winds 5 to 10 kt. Showers with a slight chance of tstms.
Wed night..SW winds 10 to 15 kt. Showers likely.
Thu..NW winds 15 to 20 kt. Waves 1 to 2 ft.
Thu night..N winds 10 to 15 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 53 degrees.
AMZ300 311 Am Est Sun Jan 24 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail through Monday. A cold front will impact the region Tuesday, followed by another storm system for mid week. High pressure will return late 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 240835 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 335 AM EST Sun Jan 24 2021

SYNOPSIS. High pressure will prevail through Monday. A cold front will impact the region Tuesday, followed by another storm system for mid week. High pressure will return late week.

NEAR TERM /THROUGH TONIGHT/. As of 4 AM: IR satellite detected a cloudy corridor between the Southeast U.S. and west Texas, a gap in cloud cover existed across AL and middle TN. With broad H5 ridging across the southern CONUS, waves of high to mid clouds should stream across the forecast area through today and tonight. The center of sfc high pressure is forecast to track from E. NC this morning, pushing off the Carolina coast this afternoon and tonight. The pattern should result in light ENE this morning, winds veering from the east this afternoon, then SSE tonight. Using a blend of the warmer MOS guidance, highs are forecast to favor lower 60s, with around 60 across the Charleston Tri-County.

Tonight: H5 ridge is expected to build across the southern CONUS as a amplified trough closes off over the TX Panhandle. At the sfc, low pressure will organize over TX/OK late tonight. Near term guidance indicates that the associated warm front will lift north across the Deep South, with the deepest moisture and forcing remain along and north of I-20 across GA/SC tonight. Guidance indicates that the forecast area will remain south of the moisture, within a relatively dry environment. Based on the plain view of the guidance and MOS, PoPs will remain below SCHC tonight. Given rising llvl thicknesses through tonight, low temperatures should remain within the low 50s, with mid 50s near the GA coast.

SHORT TERM /MONDAY THROUGH WEDNESDAY/. High pressure will slide further into the Atlantic on Monday as low pressure lifts from the Central/Southern Plains into the Mississippi River Valley. As this occurs, a warm front will lift north of the area. The best forcing will exit the area as mid level ridging builds from the south, although weak isentropic ascent could support a few showers, primarily across the Charleston Tri-county. Despite a fair amount of cloud cover, increasing warm air advection will allow highs to reach the low to mid 70s. Temperatures Monday night will be quite mild as well with lows only falling to around 60. These values are close to record high minimums for Jan 26.

The aforementioned surface low will track across the Mid-Atlantic states on Tuesday, eventually dragging a weakening cold front into the region. The front will likely stall over or in the vicinity through Tuesday night. A good portion of the day could be mostly dry, then rain chances will increase, especially across interior Georgia zones, in the afternoon. PoPs remain in the 20-40% range. It will be the warmest day of the set with highs peaking around 15 degrees above normal in the mid 70s across most locations inland of the beaches.

A mid level trough will move towards the region Tuesday night into Wednesday, while a surface low develops along the stalled boundary and eventually tracks across the area. There is still a bit of discrepancy between models regarding the strength and placement of the low. However, ample forcing from upper divergence and shortwave energy will combine with PWats of around 1.5 inches to produce a solid rain event across the local area. PoPs are maximized in the 70- 80% range. Instability isn't all that impressive, but enough to maintain mention thunder in the forecast. Temperatures will be tricky given uncertain track of the low, but current forecast features highs ranging from the low 60s across northern zones to around 70 near the Altamaha.

LONG TERM /WEDNESDAY NIGHT THROUGH SATURDAY/. Models are in good agreement in the long term period. A deepening low pressure system will lift away from the area on Thursday. High pressure will build in its wake and prevail into the weekend bringing drier and cooler conditions to the area.

AVIATION /09Z SUNDAY THROUGH THURSDAY/. VFR conditions expected at KCHS and KSAV through 06z Monday.

Extended Aviation Outlook: Flight restrictions possible in low clouds and showers early to mid week.

MARINE. Today and tonight: The center of sfc high pressure is forecast to track from E. NC this morning, pushing off the Carolina coast this afternoon and tonight. The pattern should result in light ENE this morning, winds veering from the east this afternoon, then SSE tonight. Speeds will favor values around 10 kts. Wave heights are forecast to range between 2-4 ft, subsiding to 1-3 ft tonight.

Monday through Friday: South to southwest winds will increase early this week ahead of an approaching cold front. Small Craft Advisories will be possible for portions of the waters Monday night into Tuesday, although it appears marginal at this time. Low pressure will impact the region Wednesday into Wednesday night, with deteriorating conditions in its wake. Small Craft Advisories will likely be needed Thursday into Friday. There is also a chance for a period of gale force wind gusts.

In addition, conditions will become favorable for sea fog development Monday into Tuesday as warm, moist air moves over the cooler shelf waters. We have maintained mention of patchy fog in the forecast and in the HWO.

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



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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 2 mi31 min NE 9.9 G 12 49°F 1025 hPa (+0.0)
CHTS1 8 mi43 min NNE 7 G 8.9 46°F 53°F1024.9 hPa
ACXS1 - ACE Basin Reserve, SC 29 mi106 min N 1.9 42°F 1024 hPa31°F
41033 37 mi23 min ENE 18 G 25 53°F 55°F1023.7 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 45 mi31 min ENE 14 G 18 55°F 64°F1024.2 hPa (+0.3)40°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC5 mi36 minN 010.00 miOvercast45°F32°F61%1024.7 hPa
Charleston, Charleston Air Force Base, SC18 mi35 minNE 710.00 miOvercast43°F27°F53%1024.9 hPa
Mount Pleasant Regional-Faison Field, SC18 mi36 minN 010.00 miOvercast43°F30°F61%1025.1 hPa

Link to 5 minute data for KJZI

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Tide / Current Tables for Folly Beach, Folly River bridge, Folly Island, South Carolina
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Folly Beach
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Sun -- 03:47 AM EST     Moonset
Sun -- 04:44 AM EST     5.02 feet High Tide
Sun -- 07:18 AM EST     Sunrise
Sun -- 10:45 AM EST     0.70 feet Low Tide
Sun -- 02:07 PM EST     Moonrise
Sun -- 05:05 PM EST     4.16 feet High Tide
Sun -- 05:45 PM EST     Sunset
Sun -- 10:50 PM EST     0.18 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.52.53.64.44.954.63.72.71.70.90.71.11.92.73.43.94.23.93.22.31.30.40.2

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Sun -- 01:05 AM EST     1.35 knots Max Flood
Sun -- 03:47 AM EST     Moonset
Sun -- 04:57 AM EST     -0.00 knots Slack
Sun -- 07:18 AM EST     Sunrise
Sun -- 08:21 AM EST     -1.78 knots Max Ebb
Sun -- 11:31 AM EST     0.00 knots Slack
Sun -- 01:30 PM EST     1.08 knots Max Flood
Sun -- 02:06 PM EST     Moonrise
Sun -- 04:57 PM EST     -0.00 knots Slack
Sun -- 05:44 PM EST     Sunset
Sun -- 08:29 PM EST     -1.63 knots Max Ebb
Sun -- 11:31 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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11.41.210.6-0-0.8-1.4-1.7-1.7-1.2-0.50.4110.80.5-0-0.7-1.2-1.6-1.6-1.1-0.4

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

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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.