Friday, December4, 2020
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Marine Weather and Tides
Moncks Corner, 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 7:06AMSunset 5:14PM Friday December 4, 2020 6:36 PM EST (23:36 UTC) Moonrise 9:03PMMoonset 10:47AM Illumination 76% Phase: Waning Gibbous; Moon at 20 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- 338 Pm Est Fri Dec 4 2020
.small craft advisory in effect from 9 pm est this evening through Saturday morning...
Tonight..S winds 10 to 15 kt, becoming sw 15 to 20 kt with gusts to 25 kt late this evening, then becoming W with gusts to 30 kt late. Waves 1 to 2 ft. A chance of showers.
Sat..NW winds 15 kt with gusts to 25 kt, diminishing to 10 kt in the afternoon.
Sat night..N winds 5 to 10 kt.
Sun..Variable winds 5 kt.
Sun night..W winds 5 kt. A chance of showers.
Mon..NW winds 5 to 10 kt. A chance of showers.
Mon night..NW winds 10 kt. A slight chance of showers.
Tue..NW winds 10 kt.
Tue night..NW winds 5 to 10 kt.
Wed..W winds 5 to 10 kt.
Wed night..W winds 10 kt. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 60 degrees.
AMZ300 338 Pm Est Fri Dec 4 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will pass through the area tonight, followed by high pressure through Sunday. A weak low pressure system is expected to move up the coast Sunday night into Monday. High pressure will then rebuild over the area and persist through much of the week.


7 Day Forecast for Marine Location Near Moncks Corner, SC
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location: 33.1, -79.95     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 042053 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 353 PM EST Fri Dec 4 2020

SYNOPSIS. A cold front will pass through the area tonight, followed by high pressure through Sunday. A weak low pressure system is expected to move up the coast Sunday night into Monday. High pressure will then rebuild over the area and persist through much of the week.

NEAR TERM /UNTIL 6 AM SATURDAY MORNING/. A potent shortwave and associated surface low will move into central NC tonight, pushing a cold front rapidly through the local area overnight. Although low-level moisture continues to gradually increase this afternoon/evening, the brunt of the forcing will move just north of the area. A broken line of showers will accompany the front though some areas farther to the south will probably see less coverage. Instability looks to be pretty much nil except perhaps beyond 10 nm from shore where an isolated storm is possible. Some cold advection will occur late tonight with some far inland areas potentially dipping into the upper 30s by daybreak.

Winds on Lake Moultrie will ramp up this evening ahead of and then behind the front. Although geostrophic winds will increase to 35-40 kt later tonight, mixing will not be particularly favorable since the strongest cold advection will lag the strongest winds. For now we have capped wind gusts just below Lake Wind Advisory criteria.

SHORT TERM /6 AM SATURDAY MORNING THROUGH MONDAY/. High pressure will expand into the area on Saturday behind a departing cold front. Expect clear skies and dry conditions with temperatures mainly in the lower 60s. There will be some increase in high clouds Saturday night, however they should be thin enough to allow good radiational cooling. Lows will range from the mid 30s inland to low/mid 40s at the immediate coast.

A rather weak pressure pattern will be in place on Sunday, although focus will shift to low pressure developing in the Gulf. The low is progged to track across the Florida peninsula and into the western Atlantic Sunday night. With sufficient moisture and ample forcing for ascent from upper divergence and shortwave energy, shower coverage will increase overnight. We increased PoPs to the 30-40% range based on latest guidance. Rainfall amounts are expected to remain fairly light, less than a quarter of an inch.

Drier air will begin to work in through the day on Monday as the aforementioned low lifts off to the northeast. However, enough lingering low level moisture will keep slight chance/chance PoPs in the forecast. Highs will be several degrees below normal.

LONG TERM /MONDAY NIGHT THROUGH FRIDAY/. Through Wednesday, dry with temperatures 3 to 5 degrees below normal. The region will remain between a broad upper trough centered over the northeast U.S. with a ridge over the central states and Rockies. Global models differ on the timing and position of a strong shortwave that is shown to move down the backside of the upper trough on Wednesday. Either way, models depict that this system will have little/no moisture to work with, therefore no significant precipitation chances are expected at this time.

By Thursday and Friday, models show a shallow upper ridge to build over the southeast U S. with temperatures moderating back toward normal and dry conditions. At the surface, broad high pressure over the region Thursday is expected to move offshore by Friday.

AVIATION /21Z FRIDAY THROUGH WEDNESDAY/. VFR for much of the period although various multi-layered cigs are likely to occur at both KCHS and KSAV. A cold front and associated band of rain should cross the terminals in the 02-06Z timeframe. Included three hour TEMPO groups with sub VFR vsby in -SHRA. A wind shift to the west and northwest will occur post FROPA with skies quickly clearing.

Extended Aviation Outlook: Flight restrictions possible Sunday night into Monday as low pressure passes offshore. Otherwise, VFR.

MARINE. South winds will strengthen quickly this evening ahead of the cold front, then switch to west late tonight as the front pushes offshore. Fairly strong low-level winds expected for about 6-8 hours. We maintained a Gale Warning for the Charleston nearshore waters since the strongest low-level jet will be from Charleston northward into NC. A period of 35-40 kt gusts beyond about 15 nm from the coast still seems likely. Elsewhere we show Small Craft Advisories overnight. We decided against a Gale Warning for the offshore GA waters since most models keep the stronger winds just north of there and any 35 kt gusts would be isolated/brief.

Saturday through Wednesday: Marine conditions will quickly improve on Saturday as high pressure builds in behind a departing cold front. Attention will then turn to the next low pressure system that will lift up the coast Sunday night. Winds will increase behind it, and Small Craft Advisories could be needed later Monday into Monday night. Thereafter, no marine concerns are expected as high pressure returns.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory from 9 PM this evening to 7 AM EST Saturday for AMZ330-352-354. Gale Warning from 9 PM this evening to 5 AM EST Saturday for AMZ350. Small Craft Advisory until noon EST Saturday for AMZ374.



NEAR TERM . JRL SHORT TERM . ETM LONG TERM . RFM AVIATION . ETM/JRL MARINE . ETM/JRL


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 22 mi48 min S 2.9 G 4.1 63°F 61°F1015.3 hPa
FBIS1 - Folly Island, SC 29 mi36 min S 7 G 7 63°F 1015.5 hPa
NIWS1 - North Inlet-Winyah Bay Reserve, SC 44 mi111 min SE 1 62°F 1016 hPa59°F
ACXS1 - ACE Basin Reserve, SC 46 mi111 min SSE 1 66°F 1016 hPa61°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Moncks Corner Berkeley County, SC7 mi41 minN 010.00 miMostly Cloudy64°F59°F83%1014.9 hPa
Charleston, Charleston Air Force Base, SC14 mi40 minS 510.00 miMostly Cloudy65°F57°F78%1014.9 hPa
Mount Pleasant Regional-Faison Field, SC17 mi41 minVar 310.00 miOvercast64°F60°F88%1014.9 hPa
Summerville Airport, SC18 mi41 minVar 5 G 1110.00 miOvercast68°F59°F73%1014.6 hPa

Link to 5 minute data for KMKS

Wind History from MKS (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS3SW9
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1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN3N3CalmCalmCalmCalmCalmCalmCalm
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW3CalmNW3N4CalmNW4CalmN3N4CalmCalmCalm

Tide / Current Tables for Pimlico, West Branch, Cooper River, South Carolina
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Pimlico
Click for Map
Fri -- 01:07 AM EST     1.57 feet High Tide
Fri -- 07:07 AM EST     Sunrise
Fri -- 07:54 AM EST     0.35 feet Low Tide
Fri -- 10:47 AM EST     Moonset
Fri -- 01:33 PM EST     1.98 feet High Tide
Fri -- 05:12 PM EST     Sunset
Fri -- 08:38 PM EST     0.69 feet Low Tide
Fri -- 09:03 PM EST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.51.61.51.41.10.90.60.40.40.50.91.41.8221.91.61.41.10.90.70.70.91.1

Tide / Current Tables for Charleston Harbor, off Fort Sumter, South Carolina Current (expired 1996-12-31)
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Charleston Harbor
Click for Map
Fri -- 01:34 AM EST     -2.08 knots Max Ebb
Fri -- 04:44 AM EST     0.00 knots Slack
Fri -- 07:06 AM EST     Sunrise
Fri -- 07:38 AM EST     2.25 knots Max Flood
Fri -- 10:46 AM EST     Moonset
Fri -- 10:56 AM EST     -0.00 knots Slack
Fri -- 02:11 PM EST     -2.33 knots Max Ebb
Fri -- 05:12 PM EST     Sunset
Fri -- 05:45 PM EST     0.00 knots Slack
Fri -- 08:06 PM EST     1.61 knots Max Flood
Fri -- 09:03 PM EST     Moonrise
Fri -- 11:00 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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-1.4-2-2-1.5-0.70.31.32.12.21.70.8-0-1-1.9-2.3-2.1-1.5-0.70.31.21.61.40.7-0

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
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.