Wednesday, April8, 2020
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Marine Weather and Tides
Mount Pleasant, 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 6:56AMSunset 7:46PM Wednesday April 8, 2020 10:53 AM EDT (14:53 UTC) Moonrise 7:39PMMoonset 6:34AM Illumination 100% Phase: Full Moon; Moon at 15 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- 1008 Am Edt Wed Apr 8 2020
Rest of today..SW winds 10 kt early, increasing to 10 to 15 kt with gusts to 20 kt. A slight chance of showers and tstms this afternoon.
Tonight..SW winds 10 to 15 kt. A slight chance of showers and tstms in the evening.
Thu..W winds 10 to 15 kt.
Thu night..NW winds 15 kt with gusts to 20 kt.
Fri..NW winds 10 kt.
Fri night..N winds 5 to 10 kt.
Sat..E winds 10 kt.
Sat night..SE winds 10 kt. A chance of showers.
Sun..SE winds 15 to 20 kt. Waves 1 to 2 ft. Showers likely with a slight chance of tstms.
Sun night..S winds 15 to 20 kt. Waves 1 to 2 ft. Showers likely with a slight chance of 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 68 degrees.
AMZ300 1008 Am Edt Wed Apr 8 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A series of disturbances will pass overhead through tonight. A cold front is forecasted to move through Thursday night, followed by high pressure into Saturday. A significant storm system could bring impacts to our area during the first part of next week.


7 Day Forecast for Marine Location Near Mount Pleasant, SC
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location: 32.93, -79.83     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 081444 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1044 AM EDT Wed Apr 8 2020

SYNOPSIS. A series of disturbances will pass overhead through tonight. A cold front is forecasted to move through Thursday night, followed by high pressure into Saturday. A significant storm system could bring impacts to our area during the first part of next week.

NEAR TERM /THROUGH TONIGHT/. The forecast area will remain between surface troughing to the north and high pressure suppressed to the south. Aloft, west- northwest flow will prevail, with shortwave energy progged to pass overhead late in the day/this evening. Large scale forcing will be lacking much of the day prior to the arrival of upper energy, however with dewpoints mainly in the mid 60s, the atmosphere should destabilize and allow isolated to scattered showers and thunderstorms to develop. Best coverage should be across southeast Georgia in proximity to deepest moisture.

Later this evening, upstream thunderstorms could advance into the region, with hi-res guidance pinpointing areas near the Altamaha for more organized activity. MLCAPE of around 1500 J/kg and favorable deep layer shear could support a couple stronger storms with isolated damaging wind gusts.

Tonight: Slight chance PoPs linger into the overnight and persist longest across SE GA. Later in the night, per general guidance trends depicting decreasing moisture, PoPs remain below 15 percent. Per several HREF members, organized thunderstorms could persist ahead of an upstream cold front and could approach the region late tonight/early Thursday. Odds still favor deep- layered drying overwhelming this convection, resulting in weakening/dissipating showers/thunderstorms north/west of our area. However, the ongoing rain-free forecast is low confidence.

Despite periods of mostly cloudy skies, temperatures are still expected to recover into the middle to upper 80s at most locations away from the beaches this afternoon. Tonight, expect lows 65-70F across the region.

Persistent SW winds should offset significant fog development later tonight. However, if the boundary layer decouples and winds become lighter than expected, at least patchy radiation fog could develop.

SHORT TERM /THURSDAY THROUGH SATURDAY/. Thursday: The mid-level ridge to our west will dissipate as a trough strengthens to our north. The result is mainly zonal flow overhead. At the surface, a cold front will approach our area from the northwest during the day. The front is expected to weaken as it gets closer. Models remain in very good agreement showing showers decreasing as the front gets to our area. Given the very, very low probabilities of measurable rainfall, we maintained a rain-free forecast. Compression ahead of the front along with partly to mostly sunny skies will cause high temperatures to make a run for the 90 degree mark away from the beaches. Several records are in jeopardy. Additionally, expect gusty winds ahead of the front. The front is expected to cross through during the evening or overnight hours. Expect a dry night. Temperatures will feel much cooler as they drop into the 50s.

Friday: The mid-levels consist of mainly zonal flow over our area. At the surface, a cold front will be offshore and moving away in the morning. Models hint at maybe some showers brushing areas south of Savannah in the morning. Since they are behind the front and are expected to be light, we maintained the slight chance POPs there for only the morning hours. The afternoon dries out as high pressure moves in from the northwest, settling over the Southeast overnight. The most noticeable thing will be the change in airmass. Temperatures will be much cooler, with highs generally in the low to mid 70s. It'll feel very dry as daytime dew points drop down into the 30s. These dry conditions persist into the night, which will help to cause temperatures to drop. Expect lows to be below normal, generally in the low to mid 40s away from the beaches.

Saturday: Mid-level zonal flow prevails overhead. Surface high pressure centered over the Southeast in the morning shifts offshore in the afternoon. Strong subsidence associated with the high will continue to bring dry conditions. Though, clouds should gradually increase during the day. High temperatures may be 1-2 degrees warmer than on Friday.

LONG TERM /SATURDAY NIGHT THROUGH TUESDAY/. The models are still in fairly good agreement with the long term forecast. High pressure will quickly shift offshore Saturday night. A strengthening storm system moves from the Gulf Coast across the Southeastern U.S. Sunday into Monday. Models still key in on a large area of heavy rainfall, centered mainly to the west of our area. But a shift in the track/intensity/timing could lead to a dramatically different forecast for us. We certainly have the potential to get significant rainfall and strong winds from this system. POPs have been raised to account for the better model agreement and more refinements will be needed with the upcoming forecasts.

AVIATION /14Z WEDNESDAY THROUGH SUNDAY/. Odds favor VFR conditions at both terminals for the majority of the 12Z TAF period, but occasional flight restrictions are possible due to low level moisture/isolated/scattered showers today into this evening and due to increasing low-level moisture late tonight. Specifically, occasional MVFR ceilings are expected at KSAV today, especially this morning, and recent model soundings depict the potential for MVFR/IFR ceilings at both sites late tonight. Coverage of showers remains limited and timing remains uncertain today, so precipitation is not included within 12Z TAFs. Low probability for thunderstorms to impact terminals especially KSAV this afternoon/evening and KCHS/KSAV late tonight/early Thursday. However, thunderstorm probabilities remain too low to justify any mention within the 12Z TAFs.

Extended Aviation Outlook: VFR through Saturday. A storm system could bring flight restrictions on Sunday.

MARINE. Today and tonight: SW winds generally 10-15 kts with localized gusts to 20 kt and seas 2-4 ft will prevail today and tonight.

A few thunderstorms with locally gusty winds gusts could impact GA waters late this afternoon into this evening. Outside localized hazards produced by any thunderstorms, Small Craft Advisory conditions are not expected through tonight.

THursday through Sunday: A cold front is forecasted to approach from the northwest Thursday afternoon, leading to elevated SW winds. Wind gusts could approach 25 kt for a short time Thursday afternoon for the Charleston Harbor and the Charleston County coastal waters. But it should be for a brief enough time period and a small enough area for us to not need any Small Craft Advisories. Elsewhere, winds should peak at 15-20 kt. The cold front will cross through the waters Thursday night, causing winds to veer to the NW. No advisories are expected with the front. High pressure will bring tranquil marine conditions Friday into Saturday. A significant storm system could start bringing impacts to the coastal waters late Saturday night into early next week. The track and intensity of the system will determine the exact impacts. But at this time it looks like Small Craft Advisories will probably be needed for all of the coastal waters, including the Charleston Harbor.

TIDES/COASTAL FLOODING. Higher than normal tides are expected the next several days due to astronomical influences from the full moon and perigee. Additionally, winds are forecast to be onshore at times with ocean swell, which would further elevate the tides. As a result, minor to perhaps moderate coastal flooding is expected with each high tide through Thursday. Coastal Flood Advisories will be needed. By Friday, offshore winds should lessen the chance of coastal flooding.

CLIMATE. Record high minimum temperatures for April 8: CHS . 66 degrees last set in 1999 SAV . 70 degrees set in 1882 CXM . 68 degrees last set in 1991

Record high temperatures for Thursday April 9th: CHS . 90 degrees set in 2011 SAV . 91 degrees set in 2011 Downtown Charleston . 89 degrees last set in 2001

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

NEAR TERM . ETM SHORT TERM . MS/SPR LONG TERM . MS AVIATION . MS/SPR MARINE . MS/SPR TIDES/COASTAL FLOODING . CLIMATE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 11 mi60 min W 7 G 13 76°F 69°F1011.4 hPa
41029 - Capers Nearshore (CAP 2) 14 mi46 min WSW 7.8 G 9.7 69°F 68°F1010.8 hPa
FBIS1 - Folly Island, SC 17 mi54 min WSW 8.9 G 12 72°F 1011.9 hPa (+0.3)67°F
ACXS1 - ACE Basin Reserve, SC 42 mi69 min SW 2.9 73°F 1012 hPa65°F
NIWS1 - North Inlet-Winyah Bay Reserve, SC 45 mi69 min W 9.9 71°F 1010 hPa62°F
41004 - EDISTO - 41 NM Southeast of Charleston, SC 49 mi44 min 12 G 14 71°F 70°F1011.2 hPa71°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mount Pleasant Regional-Faison Field, SC3 mi59 minN 010.00 miFair75°F64°F69%1011.2 hPa
Charleston, Charleston Air Force Base, SC11 mi2 hrsW 810.00 miA Few Clouds71°F60°F68%1011 hPa
Charleston Executive Airport, SC18 mi59 minWSW 7 G 147.00 miA Few Clouds73°F64°F74%1011.5 hPa
Moncks Corner Berkeley County, SC21 mi59 minW 67.00 miFair72°F62°F73%1011.2 hPa

Link to 5 minute data for KCHS

Wind History from CHS (wind in knots)
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Last 24hrW855SW9W12W12W10SW10SW10SW8SW8SW5SW6W7W6SW6SW7W6W7W6W5W7W8W11
1 day agoW7--SW9SW5S8SW14S14S15S11SW14SW9SW9SW8SW8SW10SW7SW10SW8SW9W8SW7SW9W9W7
2 days agoSE10SE11SE9SE9
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Tide / Current Tables for Cainhoy, Wando River, South Carolina
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Cainhoy
Click for Map
Wed -- 03:23 AM EDT     -0.92 feet Low Tide
Wed -- 06:57 AM EDT     Sunrise
Wed -- 07:33 AM EDT     Moonset
Wed -- 09:46 AM EDT     7.12 feet High Tide
Wed -- 03:39 PM EDT     -0.89 feet Low Tide
Wed -- 07:44 PM EDT     Sunset
Wed -- 08:39 PM EDT     Moonrise
Wed -- 10:18 PM EDT     7.83 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.52.30.3-0.8-0.70.52.34.35.86.97.16.34.72.70.7-0.6-0.80.11.83.95.77.17.87.6

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Wed -- 12:23 AM EDT     -3.45 knots Max Ebb
Wed -- 03:24 AM EDT     0.00 knots Slack
Wed -- 05:50 AM EDT     2.30 knots Max Flood
Wed -- 06:57 AM EDT     Sunrise
Wed -- 07:33 AM EDT     Moonset
Wed -- 09:33 AM EDT     -0.01 knots Slack
Wed -- 12:41 PM EDT     -3.16 knots Max Ebb
Wed -- 03:41 PM EDT     0.01 knots Slack
Wed -- 06:17 PM EDT     2.31 knots Max Flood
Wed -- 07:44 PM EDT     Sunset
Wed -- 08:39 PM EDT     Moonrise
Wed -- 10:04 PM EDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-3.4-3.2-2.2-0.70.922.321.60.7-0.6-2-2.9-3.1-2.3-10.41.72.32.21.91.30.1-1.4

Weather Map
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wmap_A
GEOS Local Image of Southeast    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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (10,2,3,4)
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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.