Saturday, September18, 2021
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Marine Weather and Tides
Mount Pleasant, 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 7:04AMSunset 7:22PM Saturday September 18, 2021 9:12 AM EDT (13:12 UTC) Moonrise 5:30PMMoonset 3:29AM Illumination 90% Phase: Waxing Gibbous; Moon at 12 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- 557 Am Edt Sat Sep 18 2021
Today..N winds 5 kt, becoming E 10 kt in the afternoon. A slight chance of showers and tstms this afternoon.
Tonight..E winds 5 to 10 kt. A slight chance of showers and tstms in the evening.
Sun..E winds 5 to 10 kt. A slight chance of showers and tstms in the morning, then a chance of showers and tstms in the afternoon.
Sun night..E winds 10 kt. A chance of showers and tstms.
Mon..E winds 10 to 15 kt. Showers likely. A slight chance of tstms in the morning, then a chance of tstms in the afternoon.
Mon night..E winds 5 to 10 kt. Showers likely with a chance of tstms.
Tue..E winds 10 to 15 kt. Showers likely with a chance of tstms.
Tue night..E winds 10 to 15 kt. A chance of showers and tstms.
Wed..SE winds 5 to 10 kt. Showers likely with a chance of tstms.
Wed night..W winds 5 to 10 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 82 degrees.
AMZ300 557 Am Edt Sat Sep 18 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A wet weather pattern will prevail this weekend into the middle of next week. A cold front should then move through during the second half of next week, followed by high pressure prevailing into next weekend.


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 181001 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 601 AM EDT Sat Sep 18 2021

SYNOPSIS. A wet weather pattern will prevail this weekend into the middle of next week. A cold front should then move through during the second half of next week, followed by high pressure prevailing into next weekend.

NEAR TERM /THROUGH TONIGHT/. The mention of patchy fog was removed for many areas in interior Southeast Georgia. Cigs around 8000 ft have prevented much in the way of fog formation thus far and this is likely to continue through daybreak. The rest of the forecast is on track.

Today: Surface high pressure centered over the Great Lakes will slowly build south today as H5 shortwave riding builds and gradually begins to link up with a region of increasing heights over the Mid/Upper Mississippi Valley. Although mid-level heights will rise through the day, a modest onshore flow will continue to advect low-level moisture in from off the Atlantic. No meaningful upper-level shortwaves or vorticity lobes are forecast to cross the area today, but the combination of elevated dewpoints, PWATs ranging from 1.75-2.10" and weak instability should support a round of isolated to scattered showers and tstms. The latest RAP moisture profiles show the highest H8 theta-e occurring along/south of the I-16 corridor and this is where the greatest coverage of showers/tstms are expected. Convection is likely to begin near the Georgia coast this morning, then gradually spread north and inland as the day progresses and a weak sea breeze circulation propagates ever so slowly west away from the beaches. H8 temperatures look to rise about 1C with low-level thicknesses progged to warm ~10-20 meters since Friday afternoon, but this rise will be tempered somewhat by a bit more in the way of convection. Highs should therefore only peak in the mid-upper 80s, similar to what was observed Friday afternoon.

Tonight: Convection will quickly wane after sunset as instability diminishes and low-level convergence shifts back into the Atlantic near the west wall of the Gulf Stream. Rain chances will then begin to slowly increase along the coast during the early morning Sunday as coastal speed convergence builds in response to inland cooling and a decoupling of the boundary layer relative to the warmer Atlantic. This will likely support isolated showers and perhaps a tstm moving onshore along mainly the Georgia and possibly the far southern South Carolina coast from roughly Hunting Island and points south. Slight chance pops will be highlighted for these areas with pops 0-10% away from the coastal zones. Lows will range from the lower 70s well inland to the upper 70s at the beaches with a few upper 60s possible in some of the typically cooler, more sheltered areas such as the Francis Marion National Forest.

SHORT TERM /SUNDAY THROUGH TUESDAY/. The area will remain between the weakening remnant circulation of Nicholas across the lower Mississippi River Valley and Tropical Storm Odette shifting north-northeast and further away from the region. Despite the presence of weak sfc high pressure across the Southeast United States and a mid-lvl ridge strengthening along the East Coast, the pattern will be fairly wet as a persistent southerly and onshore flow reinforces PWATs around 2.00-2.25 inches into the area while subtle h5 shortwave energy ripples aloft. Chances to numerous showers and thunderstorms remain in the forecast each day, while numerous to even widespread showers along with thunderstorms are possible Monday afternoon when the bulk of deepest moisture traverses the area. At this time, greatest precip coverage is anticipated across Southeast Georgia and convective activity is expected to remain sub-severe, although many locations could experience heavy downpours from thunderstorms early in the week.

Given the extent of precip coverage and cloudiness each day, afternoon high temps should peak in the mid 80s Sunday, then low-mid 80s Monday and Tuesday. Overnight lows should remain mild, generally ranging in the low-mid 70s away from the immediate coast.

LONG TERM /TUESDAY NIGHT THROUGH FRIDAY/. The area will remain between the weakening remnant circulation of Nicholas across the lower Mississippi River Valley and Tropical Storm Odette shifting north-northeast and further away from the region. Despite the presence of weak sfc high pressure across the Southeast United States and a mid-lvl ridge strengthening along the East Coast, the pattern will be fairly wet as a persistent southerly and onshore flow reinforces PWATs around 2.00-2.25 inches into the area while subtle h5 shortwave energy ripples aloft. Chances to numerous showers and thunderstorms remain in the forecast each day, while numerous to even widespread showers along with thunderstorms are possible Monday afternoon when the bulk of deepest moisture traverses the area. At this time, greatest precip coverage is anticipated across Southeast Georgia and convective activity is expected to remain sub-severe, although many locations could experience heavy downpours from thunderstorms early in the week.

Given the extent of precip coverage and cloudiness each day, afternoon high temps should peak in the mid 80s Sunday, then low-mid 80s Monday and Tuesday. Overnight lows should remain mild, generally ranging in the low-mid 70s away from the immediate coast.

AVIATION /10Z SATURDAY THROUGH WEDNESDAY/. KCHS/KJZI: VFR.

KSAV: VFR. A few showers/tstms could pop up near the terminal 18-21z. VCTS will be carried during this time.

Extended Aviation Outlook: Brief flight restrictions are possible at all terminals into early next week due to morning fog/stratus, while even greater chances of flight restrictions occur during showers and thunderstorms each day through Wednesday.

MARINE. Through Tonight: There are no concerns. North to northeast winds will veer to the east today as high pressure builds south. East winds will prevail overnight. Speeds will increase closer to a solid 10 kt today and continue into tonight before increasing to 10-15 kt closer to daybreak Sunday. Seas will average 1-2 ft nearshore waters with 2-3 ft offshore waters.

Sunday through Thursday: Weak high pressure on Sunday will become reinforced by stronger high pressure building south along the East Coast Monday into Wednesday. While this process unfolds, a coastal trough will attempt to develop off the Southeast Coast Tuesday, before shifting north well in advance of a cold front approaching the region late Wednesday into Thursday. Given the setup, a weak pressure gradient on Sunday will steadily tighten during the first half of the week with 10-15 kt east-northeast winds turning more east and seas averaging between 2-4 ft. Winds should continue to veer more southeast Wednesday before a cold front shifts through the region early Thursday. Strong cold air advection in wake of the front could push northerly winds upwards to 20-25 kt and build seas up to 4-6 ft, leading to a period of Small Craft Advisories across local waters starting Thursday.

An elevated risk of rip currents is possible Sunday due to onshore winds and 1-2 ft swells around 8-9 seconds impacting the beaches as Tropical Storm Odette tracks offshore and further away from the region.

TIDES/COASTAL FLOODING. Minor coastal flooding is possible along the coasts of Charleston and Colleton Counties with the evening high tide both Saturday and Sunday. A Coastal Flood Advisory could be needed. Coastal flooding is not expected along the Georgia and far southern South Carolina coasts as tides at Fort Pulaski are expected to remain below 9.5 ft MLLW.

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




Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 11 mi55 min NNW 4.1 G 6 82°F 83°F1019.5 hPa
41029 - Capers Nearshore (CAP 2) 14 mi65 min N 7.8 G 12 78°F 81°F1018.9 hPa
41065 14 mi85 min 81°F2 ft
FBIS1 - Folly Island, SC 17 mi73 min N 5.1 G 7 76°F 1019.7 hPa (+1.2)
ACXS1 - ACE Basin Reserve, SC 42 mi88 min Calm 72°F 1020 hPa72°F
NIWS1 - North Inlet-Winyah Bay Reserve, SC 45 mi88 min NNE 4.1 74°F 1019 hPa74°F
41004 - EDISTO - 41 NM Southeast of Charleston, SC 49 mi43 min N 9.7 G 12 79°F 82°F1019.1 hPa75°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 mi18 minN 08.00 miFair77°F77°F100%1019.3 hPa
Charleston, Charleston Air Force Base, SC11 mi77 minN 010.00 miPartly Cloudy73°F71°F94%1019.1 hPa
Charleston Executive Airport, SC18 mi18 minN 410.00 miFair79°F75°F89%1019.3 hPa
Moncks Corner Berkeley County, SC21 mi18 minN 410.00 miFair77°F73°F89%1019.3 hPa

Link to 5 minute data for KLRO

Wind History from LRO (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoCalmCalm4N3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
2 days agoCalm5Calm6S8Calm5
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Tide / Current Tables for Cainhoy, Wando River, South Carolina
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Cainhoy
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Sat -- 01:05 AM EDT     0.59 feet Low Tide
Sat -- 04:28 AM EDT     Moonset
Sat -- 07:05 AM EDT     Sunrise
Sat -- 07:27 AM EDT     6.45 feet High Tide
Sat -- 01:16 PM EDT     0.31 feet Low Tide
Sat -- 06:30 PM EDT     Moonrise
Sat -- 07:21 PM EDT     Sunset
Sat -- 08:02 PM EDT     7.55 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.20.60.923.34.65.76.46.35.54.22.61.10.30.51.634.66.17.17.67.15.94.2

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
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Sat -- 01:04 AM EDT     0.00 knots Slack
Sat -- 03:08 AM EDT     1.32 knots Max Flood
Sat -- 04:28 AM EDT     Moonset
Sat -- 07:01 AM EDT     -0.00 knots Slack
Sat -- 07:05 AM EDT     Sunrise
Sat -- 10:17 AM EDT     -2.29 knots Max Ebb
Sat -- 01:22 PM EDT     0.00 knots Slack
Sat -- 05:04 PM EDT     1.53 knots Max Flood
Sat -- 06:29 PM EDT     Moonrise
Sat -- 07:21 PM EDT     Sunset
Sat -- 07:44 PM EDT     -0.00 knots Slack
Sat -- 10:48 PM EDT     -2.75 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.3-0.10.91.31.21.10.80-0.9-1.7-2.3-2.1-1.4-0.40.71.41.51.51.40.8-0.3-1.5-2.5-2.7

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