Saturday, October16, 2021
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Marine Weather and Tides
Hanahan, SC

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:24AMSunset 6:46PM Saturday October 16, 2021 3:56 AM EDT (07:56 UTC) Moonrise 4:06PMMoonset 2:24AM Illumination 77% Phase: Waxing Gibbous; Moon at 10 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- 319 Am Edt Sat Oct 16 2021
.small craft advisory in effect from this evening through Sunday morning...
Today..SW winds 5 to 10 kt, increasing to 10 to 15 kt this afternoon. Scattered showers this afternoon.
Tonight..NW winds 15 to 20 kt, becoming N 20 kt with gusts 25 kt. Waves 1 to 2 ft. Scattered showers in the evening.
Sun..N winds 15 to 20 kt with gusts to 25 kt early, diminishing to 10 to 15 kt in the afternoon. Waves 1 to 2 ft early.
Sun night..N winds 10 kt.
Mon..N winds 5 to 10 kt.
Mon night..NW winds 5 kt.
Tue..NE winds 5 to 10 kt.
Tue night..SW winds 5 kt.
Wed..W winds 5 to 10 kt.
Wed night..SW winds 5 to 10 kt. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 77 degrees.
AMZ300 319 Am Edt Sat Oct 16 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will push offshore this evening. High pressure will prevail across the region most of next week, followed by a cold front towards the end of next week.


7 Day Forecast for Marine Location Near Hanahan, SC
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location: 32.91, -79.94     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 160405 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1205 AM EDT Sat Oct 16 2021

SYNOPSIS. High pressure will prevail through tonight. A cold front will move through the area Saturday evening, followed by high pressure for most of next week.

NEAR TERM /UNTIL 6 AM THIS MORNING/. No major changes were made for the midnight update.

SHORT TERM /6 AM THIS MORNING THROUGH MONDAY/. Saturday: A broad, deep and progressive mid and upper level trough from southern Canada to the middle MS Valley will sweep east-northeast through the day, with an embedded short wave trough to transition rapidly east toward the Appalachians by nightfall. This will cause a cold front trailing from strengthening low pressure in Quebec to move into the immediate vicinity during the afternoon.

There is a decent swath of moisture that advances into the local region ahead of these features, as PWat climbs to as great as 1.5 to 1.75 inches. However, by the time the front gets closer, the higher PWat is shifting offshore, suggesting that rain chances will be limited. Additionally the synoptic flow is westerly, instability is on the lower side, and the better forcing stays off to the northwest and outside the area. We kept things rainfree through early to mid afternoon, before introducing isolated to perhaps low end scattered PoP after 2 or 3 pm due to the interaction of the nearby front and a resultant sea breeze. QPF is minimal given a fast steering flow and steady progression to the front. Since we removed mention of t- storms from the forecast Friday morning, we didn'e choose to add them back into the forecast. But given a pocket of MLCAPE as much as 750-1000 J/kg over the coastal corridor, the potential for t-storms is non-zero.

A downsloping component to the mean flow and compressional heating in advance of the front will boost temps to near record levels once again (See CLIMATE below). There is actually a chance that parts of the coastal counties could hit 90F if the front and convection is slower than now anticipated.

Saturday night: The mean trough aloft pushes steadily east and through the region, allowing for the attendant surface cold front to shift into the ocean early on. This will put an end to what little shower activity there is, and is followed by the arrival of a modified Continental Polar air mass. Clearing skies and a steady influx of much cooler and drier air as the synoptic flow turns north and northwest in association with strong high pressure building from Texas, will end our stretch of abnormally warm weather, and begin a sustained period of our first truly Autumn air mass of the season. Temps by Sunday morning will be some 12-15F cooler than Saturday morning, with some 40s common along the northwest tier.

Sunday through Monday: The large scale pattern aloft will feature a west-northwest flow between the mid level trough moving into the ocean, and a ridge approaching from the west in association with an anticyclone in the Gulf of Mexico. Simultaneously at the surface, high pressure centered over or near the Arklatex on Sunday will shift into the TN Valley and Southeast Monday, bringing us noticeably cooler and dry conditions throughout. Despite full sunshine, the low level thickness forecast yields max temps only in the lower 70s Sunday with occasionally gusty northerly winds. Temps Monday will be about 1-2F warmer as there is some westerly flow in the boundary layer. In between Sunday night will bring us the coldest night of the season so far. We didn't go as low as the "pure" 1000-850 mb thickness would suggest, but opted for a blend of the various MOS products. This supports lows of 43-57F most places inland from US-17, with 50-55F on the barrier islands and in downtown Charleston.

Lake Winds: It is certainly possible that we'll require a Lake Wind Advisory Saturday night into Sunday morning on Lake Moultrie. But since conditions appear marginal for such an occurrence, and it is a third period forecast, we have chosen to not raise any advisory at this time.

LONG TERM /MONDAY NIGHT THROUGH FRIDAY/. The flow aloft that starts out from the northwest will flatten as the week progresses, leading to more of a transition to a westerly zonal flow the second half of the upcoming week. At the surface, high pressure initially overhead through Wednesday will pull offshore thereafter, with the next cold front not to approach until Friday. As of now that front looks to be moisture starved, so at best we might see small PoP late in the forecast period. temps will gradually warm through the week as the air mass moderates and there is some return flow from the Atlantic.

AVIATION /04Z SATURDAY THROUGH WEDNESDAY/. VFR. A narrow band of showers will approach the terminals this afternoon as a cold front pushes offshore. The best chances for impacts looks to be at KCHS and possibly KJZI from roughly 21-23z while KSAV looks to remain displaced from the best forcing. Will carry VCSH for both KCHS and KJZI for now with no mention at KSAV. The line will move through very quickly and will likely have little meaningful impact should showers occur.

Extended Aviation Outlook: VFR.

MARINE. Tonight: Southwest winds will prevail with speeds around 10 kt and seas 1-3 ft.

Saturday: A southwesterly flow will prevail in advance of the upstream cold front and departing high pressure to the distant east. Warm advection will temper the amount of mixing, but with some "boost" from the resultant sea breeze, we expect winds as great as 15 kt and gusty in Charleston Harbor and the Charleston Atlantic waters in the afternoon, with 10-15 kt elsewhere. Seas will hold between 2 and 3 feet, with some 4 footers arriving late.

Saturday night: Mariners are alerted to an abrupt change in conditions with the passage of the cold front, and the onset of much cooler air rushing in behind the front. Mixing of the 30 and 35 kt geostrophic winds at 1000 mb will be efficient, and that along with decent isallobaric pressure rises will yield N and NW winds climbing to 20-25 kt with gusts near 30 kt at times over the ocean. After coordination with WFO ILM, we have gone ahead and issued a Small Craft Advisory for all ocean waters. Conditions in Charleston Harbor will be close to advisory thresholds, but our confidence isn't high enough yet to issue any advisory. Seas will build another 1 or 2 feet, and 6 footers are anticipated in the outer Georgia waters overnight.

Sunday through Wednesday night: It'll take some time Sunday for the cold advection to wane, so we still have Small Craft Advisories going through late morning near shore, and late afternoon over AMZ374. Conditions thereafter look to steadily improve, as high pressure moves into the Southeast Monday, then settles directly overhead into Wednesday.

CLIMATE. Record High Temperatures for October 16 . KCHS: 90/2018 KSAV: 91/2018 KCXM: 88/2018

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory from 8 PM this evening to 11 AM EDT Sunday for AMZ350-352-354. Small Craft Advisory from 8 PM this evening to 5 PM EDT Sunday for AMZ374.




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 9 mi63 min SW 4.1G6 73°F 77°F1013.1 hPa
FBIS1 - Folly Island, SC 16 mi57 min WSW 4.1G5.1 73°F 1013.5 hPa (-0.6)
41029 - Capers Nearshore (CAP 2) 18 mi49 min WSW 12G16 77°F 77°F1012.3 hPa
41065 19 mi69 min 77°F2 ft
ACXS1 - ACE Basin Reserve, SC 36 mi72 min 0 70°F 1014 hPa70°F
NIWS1 - North Inlet-Winyah Bay Reserve, SC 50 mi72 min W 4.1 71°F 1013 hPa70°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston, Charleston Air Force Base, SC5 mi61 minWSW 410.00 miA Few Clouds70°F68°F93%1012.9 hPa
Mount Pleasant Regional-Faison Field, SC8 mi62 minN 08.00 miFair72°F72°F100%1012.9 hPa
Charleston Executive Airport, SC15 mi62 minWSW 49.00 miMostly Cloudy72°F70°F94%1013.2 hPa
Moncks Corner Berkeley County, SC20 mi62 minWSW 310.00 miFair68°F68°F100%1013.2 hPa

Link to 5 minute data for KCHS

Wind History from CHS (wind in knots)
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Last 24hr0W30W40NW3W4NW4NW6NW6W5560W8S7S5S3S30SW3SW5SW5W4
1 day agoN4N3NW4N3NW3NW4W4N5NW5NW5N7N5N5NE54S8S5S5S5SW4SW30SW30
2 days ago0N4N5N4N5N5NE10NE84NE8--N4NE6SE6SE6SE3SE4S3000000

Tide / Current Tables for Clouter Creek, north entrance, Cooper River, South Carolina
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Clouter Creek
Click for Map
Sat -- 03:24 AM EDT     Moonset
Sat -- 06:17 AM EDT     5.70 feet High Tide
Sat -- 07:24 AM EDT     Sunrise
Sat -- 12:09 PM EDT     0.76 feet Low Tide
Sat -- 05:05 PM EDT     Moonrise
Sat -- 06:44 PM EDT     Sunset
Sat -- 06:49 PM EDT     6.43 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Sat -- 01:55 AM EDT     1.22 knots Max Flood
Sat -- 03:24 AM EDT     Moonset
Sat -- 05:50 AM EDT     -0.00 knots Slack
Sat -- 07:24 AM EDT     Sunrise
Sat -- 09:07 AM EDT     -2.07 knots Max Ebb
Sat -- 12:13 PM EDT     0.00 knots Slack
Sat -- 03:58 PM EDT     1.36 knots Max Flood
Sat -- 05:04 PM EDT     Moonrise
Sat -- 06:29 PM EDT     -0.00 knots Slack
Sat -- 06:44 PM EDT     Sunset
Sat -- 09:36 PM EDT     -2.47 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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