Monday, August10, 2020
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Marine Weather and Tides
McClellanville, 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 6:38AMSunset 8:10PM Monday August 10, 2020 2:25 PM EDT (18:25 UTC) Moonrise 11:13PMMoonset 11:52AM Illumination 58% Phase: Waning Gibbous; Moon at 21 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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AMZ350 Waters From South Santee River To Edisto Beach Sc Out 20 Nm- 112 Pm Edt Mon Aug 10 2020
This afternoon..S winds 5 to 10 kt. Seas 2 ft.
Tonight..S winds 10 kt, becoming W after midnight. Seas 2 ft. A chance of showers and tstms.
Tue..SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Tue night..SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Wed..SW winds 5 to 10 kt, becoming S in the afternoon. Seas 2 ft. A chance of showers and tstms.
Wed night..S winds 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Thu..S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Thu night..S winds 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Fri..SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Fri night..S winds 10 kt. Seas 2 to 3 ft. A chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 112 Pm Edt Mon Aug 10 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. The region will remain positioned between atlantic high pressure well to the east and an inland area of broad low pressure.


7 Day Forecast for Marine Location Near McClellanville, SC
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location: 33, -79.36     debug


Area Discussion for - Wilmington, NC
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FXUS62 KILM 101630 AFDILM

Area Forecast Discussion National Weather Service Wilmington NC 1230 PM EDT Mon Aug 10 2020

SYNOPSIS. High pressure offshore and a weak trough of low pressure inland will maintain warm and humid conditions with scattered showers and thunderstorms through most of the week.

UPDATE. Only minor changes needed for morning update. Still expect temperatures a little above climo this afternoon in most areas. Weak mid-level subsidence will help hold convection at bay initially. Eventually the sea breeze and the remains of a boundary inland will become focal points for convection later this afternoon and evening.

NEAR TERM /THROUGH TUESDAY/. Primary hazards this period: lightning, localized excessive rain, and isolated TSTM wind gusts to 40 kt.

The atmospheric flow is August lazy in terms of kinetic energy through the column, as we reside near the eastern edge of an upper ridge. Effective shear and 10 meter winds are running light, clouds and upper features are very gradually moving seaward. A mid-level cap will give-way, ahead of short-wave energy late today. This should trigger TSTMs after a good day of prime heating after about 5pm beginning inland, and gradually propagating eastward, potentially fading in strength on approach to coast tonight.

Preceding this, we should see weaker capped convection near the sea breeze front, and along a WSW to ENE surface boundary over the far interior. The short-wave should help force what's left of boundary closer to the coast, while precipitable water values increase late.

No significant upper features of note Tuesday, except precipitable water values will reach to 2.25 inches. This in conjunction with low level convergence, and CAPE similar to today 2000-3000 joules worth.

SHORT TERM /TUESDAY NIGHT THROUGH WEDNESDAY NIGHT/. Shortwave energy will meander around the Ohio River Valley between two areas of upper-level ridging. A second piece of energy will also hang around the coastal areas of Georgia and offshore of the Carolinas on Thursday. These two ingredients will provide elevated thunderstorm coverage on Wednesday. Temperatures during the day are likely to hover around 90 or in the upper 80s with cloud cover and early thunderstorm development producing outflows. Overnight temperatures will remain in the upper 70s with soaring dew points in an oppressive air mass.

LONG TERM /THURSDAY THROUGH SUNDAY/. Upper-level flow will become split between two 500-mb ridges by the middle of next week. An upper-level high over the desert southwest and another ridge over the North Atlantic will provide a crevasse of weak troughing over the eastern US. Ensembles of mid-level energy remain scattered around the potential for weak shortwaves to traverse the area late next week. Overall, the ridge over the North Atlantic will attempt to creep westward on Friday and Friday night. Will maintain an elevated chance of afternoon storms on Thursday with a slightly lower chance on Friday. On Saturday, weak ridging will build into the area from the east. Models agree fairly well on the extent of the elongated trough over the southern US. Upper-level high pressure will provide above normal temperatures and suppress afternoon thunderstorm coverage. We will maintain our typical chances of an afternoon storm or two, especially along the diurnal sea breeze and inland thermal gradients. Weak ridging will continue into Sunday and Monday, but begins a slow retreat early next week.

AVIATION /18Z MONDAY THROUGH SATURDAY/. Convection already firing along the sea breeze boundary. Most of the focus will be along this boundary, with upper level winds try to take the storms toward the coast. Most of the activity will be over by nightfall.

Extended Outlook . TSTMs, isolated to scattered will continue through the period. Patches of morning fog generally between 8z-11z should be expected, or localized MVFR stratus. Winds outside of TSTMs should remain light, an southerly.

MARINE. A favorable boating environment, aside from sail racing, as light wind and gentle seas welcome mariners. The primary marine hazard remains the elements associated with TSTMs, lightning and gusty winds. Even though most TSTMs are expected over land the next couple days, radar updates are encouraged, as nocturnal TSTMs could move into the 20nm water into early mornings, or a storm drifting off land in the evening. The highest winds will be near shore during the afternoons, gusting near 16 kt. The sea spectrum is very summer- like, SSW wind-waves mixed with a Bermuda swell. Both however are on the low end in amplitude and exceedingly low sea heights are observed, from 1.3 ft at Masonboro buoy this morning, to 1.6 feet at Frying Pan shoals. Frying Pan air temp 82 and water temp 83, August right on time.

Typical summertime southerly winds around 10 knots due to the dominating Bermuda high. Seas will generally be 2-3 feet with no significant swell. Elevated shower and thunderstorm chances are expected through the middle of next week. Rain chances decrease into next weekend as weak upper-level ridging builds over the North Atlantic and attempts to slide westward.

ILM WATCHES/WARNINGS/ADVISORIES. SC . None. NC . None. MARINE . None.

SYNOPSIS . ILM UPDATE . III NEAR TERM . MJC SHORT TERM . 21 LONG TERM . 21 AVIATION . 43 MARINE . MJC/21


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41029 - Capers Nearshore (CAP 2) 20 mi78 min SSW 5.8 G 9.7 83°F 86°F1019.3 hPa
NIWS1 - North Inlet-Winyah Bay Reserve, SC 26 mi101 min SSE 8 87°F 1019 hPa75°F
CHTS1 34 mi56 min S 9.9 G 12 87°F
FBIS1 - Folly Island, SC 35 mi86 min S 7 G 8.9 85°F 1019.8 hPa (+0.0)
41004 - EDISTO - 41 NM Southeast of Charleston, SC 37 mi36 min WSW 3.9 G 5.8 83°F 84°F1 ft1018.7 hPa75°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Georgetown County Airport , SC22 mi31 minS 710.00 miFair90°F71°F55%1018.6 hPa
Mount Pleasant Regional-Faison Field, SC24 mi31 minSSE 910.00 miFair90°F77°F67%1018.3 hPa

Link to 5 minute data for KGGE

Wind History from GGE (wind in knots)
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Last 24hrS5S5S8S8S7CalmCalmCalmCalmS3CalmCalmW3CalmW4CalmCalmW5CalmS3S6SW4S10S8
1 day agoS7S7SE5S6S5SW4CalmCalmCalmCalmCalmCalmCalmW4W4CalmW3CalmNW3NW3W3W4S10
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2 days agoS7S6S8S7S9S4S3CalmN5E4CalmSW3CalmCalmCalmCalmCalmCalmS3W4S5SW3SW5SW5

Tide / Current Tables for Cape Romain, South Carolina
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Cape Romain
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Mon -- 12:30 AM EDT     4.33 feet High Tide
Mon -- 06:37 AM EDT     Sunrise
Mon -- 06:53 AM EDT     0.68 feet Low Tide
Mon -- 12:51 PM EDT     Moonset
Mon -- 01:02 PM EDT     4.48 feet High Tide
Mon -- 07:19 PM EDT     1.21 feet Low Tide
Mon -- 08:07 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.34.33.93.22.31.50.90.711.92.93.74.34.54.33.732.21.61.21.31.92.73.4

Tide / Current Tables for Five Fathom Creek entrance, South Carolina
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Five Fathom Creek entrance
Click for Map
Mon -- 12:47 AM EDT     4.53 feet High Tide
Mon -- 06:37 AM EDT     Sunrise
Mon -- 07:03 AM EDT     0.73 feet Low Tide
Mon -- 12:52 PM EDT     Moonset
Mon -- 01:18 PM EDT     4.68 feet High Tide
Mon -- 07:29 PM EDT     1.29 feet Low Tide
Mon -- 08:07 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.44.54.23.52.61.710.711.82.83.74.44.74.64.13.32.41.81.31.41.82.63.4

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

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Wilmington, NC (14,3,4,5)
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Ground Weather Radar Station Wilmington, NC
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Disclaimer:
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.