Monday, September20, 2021
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Marine Weather and Tides
Kiawah Island, 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 7:05AMSunset 7:20PM Monday September 20, 2021 12:24 AM EDT (04:24 UTC) Moonrise 6:34PMMoonset 5:36AM Illumination 98% Phase: Waxing Gibbous; Moon at 13 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- 1206 Am Edt Mon Sep 20 2021
Rest of tonight..E winds 10 to 15 kt, except 15 kt with gusts to 20 kt near the harbor entrance. Scattered showers with isolated tstms.
Mon..E winds 15 to 20 kt with gusts to 25 kt. Waves 1 to 2 ft. A chance of tstms. A chance of showers in the morning, then showers in the afternoon. Locally heavy rainfall possible.
Mon night..E winds 10 to 15 kt. Showers with a chance of tstms. Locally heavy rainfall possible.
Tue..SE winds 10 to 15 kt. Showers with a chance of tstms. Locally heavy rainfall possible.
Tue night..SE winds 5 to 10 kt. A chance of tstms. Showers.
Wed..S winds 5 to 10 kt. Showers with a chance of tstms.
Wed night..SW winds 5 to 10 kt, becoming W after midnight. A chance of tstms. Showers.
Thu..NW winds 5 kt. A slight chance of showers and tstms.
Thu night..N winds 5 to 10 kt.
Fri..N winds 5 to 10 kt.
Fri night..NE winds 5 kt. Mariners are reminded that winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 83 degrees.
AMZ300 1206 Am Edt Mon Sep 20 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A wet weather pattern will prevail into the middle of the week. A cold front will move through the area Wednesday night into early Thursday, followed by drier high pressure prevailing through the weekend.


7 Day Forecast for Marine Location Near Kiawah Island, SC
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location: 32.59, -80.11     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 200223 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1023 PM EDT Sun Sep 19 2021

SYNOPSIS. A wet weather pattern will prevail into the middle of the week. A cold front will move through the area Wednesday night into early Thursday, followed by drier high pressure prevailing through the weekend.

NEAR TERM /UNTIL 6 AM MONDAY MORNING/. Radar imagery has showers mainly across our GA counties, with less coverage over our SC counties. CAMS indicate the activity will pick up later overnight. A plume of moisture remains over our region and the low level confluent axis is expected to slowly shift northward from the Georgia coast into the South Carolina coast as we go through the night. The POP forecast reflects this. Lows will generally be in the 70s.

SHORT TERM /6 AM MONDAY MORNING THROUGH WEDNESDAY/. Monday and Monday night: A deep layered ridge will encompass much of the eastern states, as a short wave trough shifts east through the mid and lower Mississippi Valley toward the Tennessee Valley. At the surface, high pressure strengthening and extending south along the east coast will set up a fairly strong onshore flow across the local area, as a stationary front remains to the south and southeast. This pattern will reinforce the deep, tropical moisture into the area, with PWATs approaching 2.25-2.50 inches. With as much as 1000- 1500 J/kg of MLCAPE and LI's of -1 to -3, we have at least modest instability to go along with the abundance of moisture. With some upper difluence atop strong low level convergence where there is a 25-30 kt 925 mb jet, conditions will support a wet and unsettled period.

The biggest concern during this time will be the potential for at least minor flooding in heavy rainfall. Since WPC "only" has the local region within a Slight Risk for Excessive Rainfall, we chose not to hoist a Flood Watch. However, given the potential for back building of convection with the low level flow greater than the mean steering flow, a warm cloud layer in excess of 14K feet and a fully saturated vertical column, it is possible that a Flood Watch could be necessary at a later time. We added mention of heavy rainfall to the grids. While any watch could cover much of the forecast area, the higher chances for flooding is over the coastal corridor, where the HREF has the greatest probabilities of more than 5 inches. The latest QPF shows an average of 1/2 to 1 1/2 inches Monday and 1/4 to 1 inch at night. Categorical PoP is forecast everywhere at some point. The higher chances will original stay south of the Charleston tri-county district Monday morning, then spread north in the afternoon. There will be a bit of a lull in activity early Monday night, coverage expands again with the best coverage into our South Carolina zones overnight.

The wet pattern will limit any severe risk, while holding down max daytime temps but keeping them higher than normal at night.

Tuesday through Wednesday: The mid and upper ridge relaxes its grip across the east and southeast, then pulls further into the ocean, as a strong and deepening trough from the Plains Tuesday digs into Midwest and toward the Tennessee valley Wednesday. the local area is within somewhat of a Col region tuesday, but within a strong cyclonic flow aloft on Wednesday. High pressure is the main surface feature Tuesday, but gives way to an approaching cold front Wednesday. Meanwhile, TC Peter stays to the east of the Bahamas during this time.

Plenty of tropical moisture will persist across the region Tuesday, leading to another unsettled day with numerous to widespread showers and scattered thunderstorms. Some of the rains will again be heavy, resulting in at least minor flooding potential. For Wednesday there is not only plenty of moisture, but also enough instability and CAPE in advance of a cold front, that there might be a chance of a few strong or marginally severe thunderstorms. At a minimum, locally heavy rains will occur.

LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/. A cold front associated with the high amplitude trough is expected to shift through the area by early Thursday, likely bringing an end to a wet pattern as drier and cooler high pressure spreads across the Southeast into early next weekend. Along the front, deep moisture characterized by PWATs around 2.0 inches will support at least chances of showers/thunderstorms Wednesday night, some potentially strong before shifting offshore.

The front will be responsible for keeping TC Peter far offshore, as it heads north toward Bermuda by late week.

Once the frontal passage occurs locally, conditions will be noticeably drier and cooler with high pressure dominating the pattern and a northerly wind in place through next weekend. High temps should average in the upper 70s to lower 80s Thursday to Saturday, then gradually warm a degree or two Sunday. Low temps in the mid-upper 60s Wednesday night should dip into the mid-upper 50s away from the coast during the weekend.

AVIATION /02Z MONDAY THROUGH FRIDAY/. KCHS/KJZI: Mainly VFR tonight. Increasing SE flow and low level convergence will drive heavier rainfall up the coast during the daylight hours on Monday. We have MVFR during this time period, but wouldn't be surprised if this needs to be lowered to IFR with later TAF issuances. Also, winds will become gusty on Monday.

KSAV: Easterly flow and low level convergence will continue to drive showers into the TAF site for much of the TAF time period. We have conditions deteriorating to MVFR, but wouldn't be surprised if this needs to be lowered to IFR with later TAF issuances.

Extended Aviation Outlook: Periods of flight restrictions are likely at times at all terminals Monday into Wednesday due to showers and thunderstorms across the region. A cold front will then shift through the region Wednesday night into early Thursday, bringing another round of flight restrictions across the area. VFR conditions will prevail in wake of the front through Friday.

MARINE. Tonight: Northeasterly to easterly winds 10-20 kt will persist as strong sfc high pressure builds into New England and down the east coast. Seas will average 2-4 ft.

Monday and Monday night: As high pressure moves east through New England and intensifies, the pressure gradient will become more enhanced across the South Carolina waters to the north of a stationary front. We went back and forth on a possible Small Craft Advisory in Charleston Harbor and on the South Carolina waters for Monday, but opted against doing so. Our reasoning is that despite the HREF indicating 50% or greater chances of winds that high, the SREF has only around 5% chances. Plus the geostrophic winds are no more than about 25 kt and 925 mb winds are 25-30 kt. Meanwhile, seas will build to 4 or 5 feet throughout, and maybe a few 6 footers slip into the AMZ350 waters, but the coverage would be limited. It's certainly possible that an advisory could be required, but since it's marginal, we opted not to issue at this time. Mariners are advised that numerous to widespread showers and scattered thunderstorms will occur, producing heavy rains at times and dropping visibilities under 1 nm.

Tuesday and Tuesday night: High pressure will be the main synoptic feature with a subtle inverted trough across the local waters. Meanwhile, TC Peter will head west and northwest to the east of the Bahamas. The gradient is more relaxed, so no advisories are expected.

Wednesday through Friday night: A cold front is forecast to approach Wednesday, pushing through Wednesday night and early Thursday. This will steer TC Peter off to the north, as it draws closer to Bermuda by late week. The cold front will make it to Florida and maybe even the far northwest Bahamas late in the period, as continental high pressure builds in its wake. Even with some cool advection behind the front, winds and seas will stay below advisory thresholds.

Rip Currents: Although there doesn't look to be much swell energy at the beaches Monday, given astronomical influences, moderate to strong onshore winds and rip currents from at least Tybee Island the past two days, we have a Moderate Risk at all beaches Monday. The risk is expected to be low on Tuesday.

TIDES/COASTAL FLOODING. Astronomical influences, tides that are already running high and onshore winds will result in at least minor coastal flooding over Charleston and coastal Colleton County the first 2 or 3 days this week. While the risk is greater with the evening high tides, both tidal cycles have a chance. The risk will be further aggravated due to the potential for heavy rainfall at and/or near the times of the high tide, especially Monday and Tuesday.

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



NEAR TERM . SHORT TERM . 33 LONG TERM . 33 AVIATION . 33 MARINE . 33 TIDES/COASTAL FLOODING .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 13 mi25 min E 13 G 16 82°F 1019 hPa (+0.8)
CHTS1 16 mi55 min E 15 G 19 80°F 83°F1018.8 hPa
ACXS1 - ACE Basin Reserve, SC 18 mi100 min NNE 1.9 76°F 1019 hPa75°F
41033 27 mi77 min ESE 7.8 G 14 81°F 83°F1017.6 hPa
41029 - Capers Nearshore (CAP 2) 30 mi77 min E 16 G 23 82°F 82°F1018.1 hPa
41065 30 mi37 min 81°F3 ft
41004 - EDISTO - 41 NM Southeast of Charleston, SC 54 mi35 min E 18 G 21 83°F 84°F5 ft1018.4 hPa74°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC10 mi30 minE 610.00 miOvercast81°F75°F84%1018.6 hPa
Charleston, Charleston Air Force Base, SC23 mi29 minENE 510.00 miMostly Cloudy76°F73°F91%1018.6 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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Last 24hrCalmCalmCalmN3N3CalmNE3NE5NE5E11E12E13E10
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1 day agoCalmCalmCalmN4NW4N4CalmN4N4N44E6E8E7E8E8E9E6E3CalmCalmCalmCalmCalm
2 days agoN3NW3CalmCalmNW5NW4CalmCalmCalmN4N4N5CalmCalmSE5SE4SE4SE5CalmCalmW3CalmCalmCalm

Tide / Current Tables for Kiawah River Bridge, South Carolina
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Kiawah River Bridge
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Mon -- 02:12 AM EDT     0.24 feet Low Tide
Mon -- 06:36 AM EDT     Moonset
Mon -- 07:07 AM EDT     Sunrise
Mon -- 08:32 AM EDT     6.43 feet High Tide
Mon -- 02:27 PM EDT     0.20 feet Low Tide
Mon -- 07:19 PM EDT     Sunset
Mon -- 07:33 PM EDT     Moonrise
Mon -- 07:54 PM EDT     Full Moon
Mon -- 08:59 PM EDT     6.82 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.510.30.51.634.45.66.36.35.64.32.71.20.30.31.22.64.15.56.56.86.45.2

Tide / Current Tables for Charleston Harbor, off Fort Sumter, South Carolina Current (expired 1996-12-31)
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Charleston Harbor
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Mon -- 12:01 AM EDT     -2.74 knots Max Ebb
Mon -- 03:08 AM EDT     0.01 knots Slack
Mon -- 06:03 AM EDT     2.10 knots Max Flood
Mon -- 06:34 AM EDT     Moonset
Mon -- 07:06 AM EDT     Sunrise
Mon -- 09:02 AM EDT     -0.00 knots Slack
Mon -- 12:14 PM EDT     -2.71 knots Max Ebb
Mon -- 03:20 PM EDT     0.00 knots Slack
Mon -- 06:18 PM EDT     2.34 knots Max Flood
Mon -- 07:18 PM EDT     Sunset
Mon -- 07:32 PM EDT     Moonrise
Mon -- 07:54 PM EDT     Full Moon
Mon -- 09:29 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-2.7-2.5-1.6-0.21.11.92.11.91.20.1-1.3-2.3-2.7-2.5-1.8-0.50.91.92.32.21.70.7-0.7-1.9

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