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Marine Weather and Tides
Version 3.4 |
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported. 5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive. 5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds. |
| Sunrise 7:09AM | Sunset 7:12PM | Monday September 25, 2017 1:12 PM EDT (17:12 UTC) | Moonrise 11:06AM | Moonset 9:55PM | Illumination 25% |  |
Marine Forecasts
EDIT (on/off) Help| AMZ330 Charleston Harbor- 1011 Am Edt Mon Sep 25 2017 Rest of today..N winds 10 to 15 kt. Waves 1 to 2 ft near the harbor entrance. Tonight..N winds 10 kt. Tue..N winds 10 kt. Tue night..NW winds 5 kt. Wed..NW winds 5 to 10 kt. Wed night..W winds 5 kt. Thu..W winds 5 kt. Thu night..SW winds 5 kt. Fri..NE winds 5 kt. A slight chance of showers and tstms. Fri night..E winds 5 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 80 degrees. | AMZ300 1011 Am Edt Mon Sep 25 2017 Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Hurricane maria will track northward off the southeast u.s. Coast through midweek then will turn northeast and will move away from the coast. A cold front will move through the area from the northwest late this week, followed by high pressure that will build into the region through next weekend. |
7 Day Forecast for Marine Location Near Hanahan, SC
Hourly EDIT Helplocation: 32.91, -79.94 debug
Area Discussion for - Charleston, SC
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus62 kchs 251419 afdchs area forecast discussion national weather service charleston sc 1019 am edt Mon sep 25 2017 Synopsis Hurricane maria will track northward off the southeast u.S. Coast through midweek then will turn northeast and will move away from the coast. A cold front will move through the area from the northwest late this week, followed by high pressure that will build into the region through next weekend. Near term through tonight Late this morning: no significant changes were needed to the going forecast. Satellite imagery shows plentiful mid and high level clouds streaming in from distant hurricane maria. Aloft, southeasterly flow between the ridge north of maria and the trough across the deep south is helping to funnel this outflow cloudiness from maria into the carolinas and portions of georgia. The 12z chs RAOB shows a very dry atmosphere with precipitable water just over an inch and plentiful dry air in the mid levels. This will continue through the day and keep the forecast dry. The main forecast issue revolves on the coverage of clouds and potential impacts on temperatures. The forecast continues to feature mid to upper 80s, with the coolest values around the tri-county region which will see the bulk of the cloud cover. Tonight: maria will pass well of the coast, reaching near the latitude to the distant east of the santee river by Tuesday at sunrise. There is still some outflow of cirrus overhead, but soundings and cross- sections indicate that the coverage of these clouds will be less than last night and during today. Some of the MOS guidance supports late night stratus, but the sref probabilities are minimal enough where we don't have any mention of fog at this time. Most places will experience rapid decoupling of low level winds in the evening, allowing for adequate radiational cooling to support lows 66-71f inland from us-17, 72-73f in downtown charleston, near lake moultrie and along many coastal sections. Short term Tuesday through Thursday Models are in good agreement that precipitation chances will generally remain very low through mid-week under sufficient subsidence as maria passes the area offshore. Some isolated shower or thunderstorm activity cannot be entirely ruled out Tuesday over the coastal waters or even near coastal sc, but probabilities look exceedingly low at this time, supported by GFS ensemble mean qpf values of essentially 0 inches through at least 18z Wednesday. A warming trend with above normal temperatures will persist, with highs in the mid to upper 80s Tuesday, but most locations reaching lower 90s Wednesday and Thursday. Low temperatures will range from the upper 60s to lower 70s through the period. Long term Thursday night through Sunday Chances for showers thunderstorms will begin increasing late Thursday into the weekend due to an approaching cold front. Guidance continues to suggest that the front will complete passage through the forecast area likely by late Friday or early Saturday. Cooler high pressure will then begin filling in behind the front, with early guidance suggesting a high pressure wedge-type pattern could set up near or over the area Saturday into Sunday. Aviation 14z Monday through Friday Vfr with the chance for potential brief flight restrictions through early afternoon at kchs due to broken stratocumulus and or cumulus decks, and again in low stratus late in the valid 12z TAF cycle. Extended aviation outlook: mainlyVFR conditions are expected, with low probabilities for morning restrictions due to fog, mainly Wednesday and Thursday. Marine Today: the ongoing small craft advisories for all waters will |
remain in effect, as large seas (mainly in the form of e-se swells) continues to occur due to hurricane maria far to the e. Both the nwps and the wna wave guidance is a tad high this morning, so slight modifications have been made. But even so, with some wind waves mixed in due to n-ne winds of 13-18 kt and gusty, seas will reach as high as 7 to 9 ft within 20 nm of the entire coast, and 10 or 11 ft on the outer ga waters. Winds in charleston harbor will be closer to 10 or 12 kt, but some of that swell energy will impact the harbor entrance, with waves up to 2 ft to occur. Tonight: as the hurricane continues her northward movement, winds and seas will slowly start to come down, enough so where the small craft advisory on the amz354 waters will drop off late tonight. But seas will still be elevated on the other atlantic waters outside the charleston harbor, where small craft advisories will remain in effect. Tuesday through Friday: a prolonged period of small craft advisories will continue due to high seas pushing into the waters from offshore hurricane maria. Generally northerly winds will gradually back nw Tuesday while slowly diminishing to 10-15 knots with some gusts to near 20 knots. Latest guidance suggests seas will remain above small craft advisory criteria through Wednesday afternoon or evening, but relatively benign sea conditions are anticipated Thursday into Friday, with winds generally 5-10 knots and seas 2-4 ft. A cold front followed by strong high pressure to the north will lead to an enhanced onshore gradient Saturday, and winds and seas could again be high enough where sca's are once again necessary. Rip currents: with large and powerful long period swells from hurricane maria to occur, a high risk for life-threatening rip currents will persist. No one should enter the surf due to these extremely dangerous conditions. An elevated risk will persist through at least mid week due to continued long period swells from maria. Tides coastal flooding Powerful e-se swells originating from hurricane maria will continue to impact the coast today, with the larger breakers along the sc coast, where a high surf advisory remains in effect for 5 or 6 foot breakers. While a few breakers of 5 feet can reach the ga beaches, the majority of them will be of less height, so no high surf advisory is required. The large surf along with tides remaining well above normal will continue to produce significant wave run-up, causing additional erosion around the times of high tide today and continuing through early this week. Conditions will be very close to the requirement of a coastal flood advisory with the early afternoon high tide along much of the sc coast, with minor salt water flooding likely. Similar conditions will prevail again for the Tuesday early afternoon high tide. Chs watches warnings advisories Ga... High risk for rip currents until 8 pm edt this evening for gaz117- 119-139-141. Sc... High risk for rip currents until 8 pm edt this evening for scz048>051. High surf advisory until 8 pm edt this evening for scz048>051. Marine... Small craft advisory until 8 pm edt Tuesday for amz352. Small craft advisory until 4 pm edt Wednesday for amz350-374. Small craft advisory until 5 am edt Tuesday for amz354. Near term... Bsh short term... Jmc long term... Jmc aviation... Jmc marine... Jmc tides coastal flooding... |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a map| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
| CHTS1 | 9 mi | 43 min | NNW 5.1 G 8 | 83°F | 81°F | 1013.1 hPa | ||
| FBIS1 - Folly Island, SC | 16 mi | 73 min | NNE 8 G 8.9 | 76°F | 1013.7 hPa (-0.3) | 69°F | ||
| 41029 - Capers Nearshore (CAP 2) | 18 mi | 65 min | NNE 14 G 19 | 73°F | 80°F | 1012.4 hPa | ||
| ACXS1 - ACE Basin Reserve, SC | 36 mi | 88 min | N 1.9 | 77°F | 1013 hPa | 69°F | ||
| NIWS1 - North Inlet-Winyah Bay Reserve, SC | 50 mi | 88 min | N 7 | 71°F | 1014 hPa | 67°F |
Wind History for Charleston, SC
(wind in knots) EDIT (on/off) Help| 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | |
| Last 24hr | N | NE G17 | NE G14 | N G11 | NE G12 | NE | NE | N | N | N | N | N | N G14 | N G12 | N G11 | N G12 | N G10 | N G8 | N G10 | N | N G11 | N G10 | NW G9 | NW |
| 1 day ago | NE G15 | E G16 | NE | NE G13 | NE | E | NE | NE | NE | NE | NE | N | N | N | N | N | NW | N G9 | N G10 | N G8 | N G12 | N G13 | N G13 | NE |
| 2 days ago | E | SE | E G21 | N | NE | E | E | NE | NE | NE | N | N | NE | N | N | NW | NW | N | N G8 | N G6 | N | N G10 | N | NE G15 |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Charleston, Charleston Air Force Base, SC | 5 mi | 77 min | NNE 8 | 10.00 mi | Mostly Cloudy | 80°F | 68°F | 67% | 1013 hPa |
| Mount Pleasant Regional-Faison Field, SC | 8 mi | 38 min | NE 3 | 10.00 mi | Fair | 79°F | 69°F | 74% | 1012.9 hPa |
| Charleston Executive Airport, SC | 15 mi | 38 min | N 8 | 10.00 mi | Fair | 81°F | 69°F | 70% | 1012.9 hPa |
| Moncks Corner Berkeley County, SC | 20 mi | 38 min | NNE 6 | 10.00 mi | Fair | 77°F | 66°F | 69% | 1013.5 hPa |
| Summerville Airport, SC | 21 mi | 18 min | NE 6 | 10.00 mi | Fair | 79°F | 66°F | 65% | 1013.5 hPa |
Wind History from CHS (wind in knots)
| 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | |
| Last 24hr | NE | NE | NE | N | NE | NE | N | NE | NE | N | NE | N | N | N | N | N | NE | N | N | N | N | N | N | NE |
| 1 day ago | E | SE | SE | SE | E | E | E | E | E | E | NE | NE | NE | NE | NE | NE | N | N | NE | N | NE | N | NE | NE |
| 2 days ago | N | Calm | NE | NE | SE | SE | SE | SE | Calm | NE | NE | Calm | Calm | N | N | N | N | N | NE | N | NE | NE | NE | NE |
Tide / Current Tables for Clouter Creek, north entrance, Cooper River, South Carolina
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of Data| Clouter Creek Click for Map Mon -- 12:32 AM EDT 5.54 feet High Tide Mon -- 06:26 AM EDT 0.90 feet Low Tide Mon -- 07:10 AM EDT Sunrise Mon -- 12:05 PM EDT Moonrise Mon -- 01:08 PM EDT 5.95 feet High Tide Mon -- 07:03 PM EDT 1.26 feet Low Tide Mon -- 07:11 PM EDT Sunset Mon -- 10:54 PM EDT Moonset Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 5.5 | 5.5 | 4.9 | 3.9 | 2.7 | 1.6 | 1 | 1 | 1.7 | 2.8 | 4 | 5 | 5.6 | 5.9 | 5.7 | 4.9 | 3.8 | 2.6 | 1.7 | 1.3 | 1.6 | 2.4 | 3.5 | 4.4 |
Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
EDIT (on/off) Help One Week of Data| Charleston Harbor Entrance Click for Map Mon -- 03:22 AM EDT -1.79 knots Max Ebb Mon -- 06:31 AM EDT 0.00 knots Slack Mon -- 07:09 AM EDT Sunrise Mon -- 09:01 AM EDT 1.42 knots Max Flood Mon -- 12:05 PM EDT Moonrise Mon -- 12:49 PM EDT -0.00 knots Slack Mon -- 04:09 PM EDT -2.00 knots Max Ebb Mon -- 07:11 PM EDT Sunset Mon -- 07:15 PM EDT 0.00 knots Slack Mon -- 09:23 PM EDT 1.36 knots Max Flood Mon -- 10:54 PM EDT Moonset Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| -0 | -0.8 | -1.4 | -1.8 | -1.7 | -1.2 | -0.4 | 0.4 | 1.1 | 1.4 | 1.2 | 0.9 | 0.6 | -0.1 | -1 | -1.7 | -2 | -1.8 | -1.1 | -0.2 | 0.7 | 1.3 | 1.2 | 0.8 |
Weather Map and Satellite Images
(on/off) HelpWeather Map | IR Satellite Image from GEOS GOES Local Image of Southeast EDIT  |
Wind Forecast for Charleston, SC (13,3,4,5)
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Ground Weather Radar Station Charleston, SC
(on/off) Help
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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 numerious 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. |