Tuesday, March2, 2021
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Marine Weather and Tides
Kiawah Island, SC

Version 3.4
NOTICE
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 6:44AMSunset 6:19PM Tuesday March 2, 2021 8:27 PM EST (01:27 UTC) Moonrise 10:13PMMoonset 9:03AM Illumination 81% Phase: Waning Gibbous; Moon at 19 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- 637 Pm Est Tue Mar 2 2021
.small craft advisory in effect from midnight est tonight through Wednesday morning...
Tonight..NE winds 15 to 20 kt. Gusts to 25 kt after midnight. Waves 1 to 2 ft. Showers. A slight chance of tstms after midnight.
Wed..N winds 15 to 20 kt. Gusts to 25 kt in the morning. Waves 1 to 2 ft. Rain, mainly in the morning.
Wed night..NW winds 5 to 10 kt.
Thu..W winds 5 kt.
Thu night..W winds 5 kt, becoming N after midnight.
Fri..NE winds 5 to 10 kt.
Fri night..NE winds 5 to 10 kt. A chance of showers.
Sat..NE winds 10 kt. A chance of showers.
Sat night..N winds 10 kt. A slight chance of showers.
Sun..N winds 10 to 15 kt.
Sun night..NE winds 5 to 10 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 58 degrees.
AMZ300 637 Pm Est Tue Mar 2 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Low pressure will move across the area this evening and tonight, before shifting offshore Wednesday morning. High pressure will then prevail through much of the week until another storm system brushes the area this weekend. High pressure will return again early next week.


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 022341 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 641 PM EST Tue Mar 2 2021

SYNOPSIS. Low pressure will move across the area this evening and tonight, before shifting offshore Wednesday morning. High pressure will then prevail through much of the week until another storm system brushes the area this weekend. High pressure will return again early next week.

NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/. A closed mid level low will track from the lower Mississippi River Valley to the East Coast tonight. At the surface, low pressure will lift northeast out of the Gulf of Mexico into the western Atlantic, eventually coming to a position off the Georgia/South Carolina coast around daybreak. Widespread showers are expected through the night as all the ingredients come together - PWats of 1.25-1.5 inches and large scale forcing in the form of isentropic ascent and upper divergence. Marginal elevated instability could support isolated cloud to ground lightning strikes across much of the area late tonight when the strongest forcing moves through. Storm total rainfall this evening through tonight is forecast to be 2-2.5 inches, except 1.5-2 inches across the northwestern tier. While rain rates don't look to be particularly high, there could be some pockets of heavier rainfall that could produce ponding on roadways and minor flooding in low-lying and poor drainage areas. Temps won't fall all that much from current values. Lows are forecast to be in the 40s.

SHORT TERM /6 AM WEDNESDAY MORNING THROUGH FRIDAY/. Wednesday: Sfc low pressure will likely be centered offshore by daybreak, exiting further to the east late morning into early afternoon with a more stable northerly flow in its wake. Aloft, a h5 shortwave will quickly advance offshore, setting up a west-northwest downsloping wind off the sfc. The result will be a drying trend across the area as the bulk of widespread rains shift offshore across Southeast Georgia late morning, followed by locations in southeast South Carolina by early afternoon. Temps will struggle to warm into the mid/upper 50s during the day. Clearing skies and light winds overnight will favorable a strong radiational cooling component in regards to overnight temps. In general, low temps should dip into the upper 30s inland to low/mid 40s closer to the coast.

Lake winds: Winds could gust up to 25 kt over Lake Moultrie Wednesday morning in wake of a low pressure system shifting offshore. A Lake Wind Advisory could be needed.

Thursday and Friday: Conditions will remain dry, but notably warmer on Thursday as a more favorable downsloping wind persists across the region while a full day of sun promotes strong sfc heating and mid- lvl ridging nudges into the area from the west late. Afternoon temps should range in the mid/upper 60s. Overnight lows will be slightly more mild than the day before, dipping into the low/mid 40s (coolest inland). By daybreak Friday, a dry backdoor cold front should arrive from the north, helping maintain a light northerly wind throughout the day. Temps will be a few degrees cooler, especially across northern areas where fropa occurs earliest. In general, highs should peak in the upper 50s/lower 60s across southeast South Carolina and mid 60s across southeast Georgia.

LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/. Low confidence this period as models keep differing regarding how impactful the next storm system will be late week. Cooler and dry high pressure should then prevail Sunday through Tuesday. Temperatures should stay near to below normal through the period, with frost and/or freeze conditions inland Sunday and Monday and possibly a frost inland Tuesday morning.

AVIATION /00Z WEDNESDAY THROUGH SUNDAY/. Light to moderate rain will overspread the terminals this evening and persist through midday Wednesday. Occasional MVFR vsbys will accompany the heavier rainfall late this evening and overnight. The main issue will be lowering ceilings later this evening with IFR ceilings likely at both terminals from late this evening into early Wed afternoon. Fairly good agreement in the models that VFR will return late Wed afternoon.

Extended Aviation Outlook: VFR through Friday. Flight restrictions could return this weekend, mainly at the SAV terminal, as a low pressure system tracks across or near the region.

MARINE. Tonight: Low pressure will lift northeast out of the Gulf of Mexico into the western Atlantic tonight. Winds and seas will remain elevated, and a Small Craft Advisory is ongoing for the nearshore and outer waters through the night, with an additional Advisory to go into effect for the Charleston Harbor at midnight. The worst conditions will occur during the 06-12z timeframe as the low moves into the waters.

Wednesday through Sunday: Strong low pressure will be centered offshore by daybreak Wednesday, likely shifting further east and away from the area during the day. A strong pressure gradient in wake of the low will continue supporting northerly winds between 20- 25 kt across most waters through the afternoon, with even some portions of northern South Carolina waters and offshore Georgia waters gusting around 30 kt at times late morning into early afternoon. Although a few gusts could reach gale force across northern South Carolina waters during this time frame, cold air advection is not all that impressive behind the departing system. For this reason, the window of opportunity appears too short-lived to support a Gale Watch at this time. Expect conditions to improve heading into evening hours with Small Craft Advisories dropping across nearshore waters south of Edisto Island, SC. Remaining waters should then improve to below small craft advisory conditions during early Wednesday night.

The remainder of the week will be fairly quiet with high pressure building and persisting across the region late week until another low pressure system approaches and passes near the area this weekend. Small Craft Advisories could be needed again late Friday, but more likely starting Saturday with the passing system and potentially through early next week as high pressure spreads across the waters.

TIDES/COASTAL FLOODING. Favorable onshore winds and astronomical influences will lead to elevated tides through mid week. Minor coastal flooding is possible with the high tides through Wednesday evening, primarily along the South Carolina coast. In addition, heavy rainfall is possible during this evening's high tide which would exacerbate any flooding issues.

CLIMATE. Record rainfall for March 3: KCHS: 1.81 inches/2012 KCXM: 1.73 inches/2012 KSAV: 2.70 inches/1948

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory from midnight tonight to 11 AM EST Wednesday for AMZ330. Small Craft Advisory until 7 PM EST Wednesday for AMZ352-354. Small Craft Advisory until midnight EST Wednesday night for AMZ350-374.



NEAR TERM . JRL SHORT TERM . DPB LONG TERM . RJB AVIATION . JRL/RJB MARINE . DPB/ETM TIDES/COASTAL FLOODING . CLIMATE .


Weather Reporting Stations
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Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC10 mi32 minENE 96.00 miOvercast with Haze48°F43°F82%1019.6 hPa
Charleston, Charleston Air Force Base, SC23 mi31 minENE 710.00 miOvercast46°F39°F77%1020.5 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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Tide / Current Tables for Kiawah River Bridge, South Carolina
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Kiawah River Bridge
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Tue -- 04:10 AM EST     -0.58 feet Low Tide
Tue -- 06:46 AM EST     Sunrise
Tue -- 09:02 AM EST     Moonset
Tue -- 10:23 AM EST     6.01 feet High Tide
Tue -- 04:27 PM EST     -0.50 feet Low Tide
Tue -- 06:18 PM EST     Sunset
Tue -- 10:13 PM EST     Moonrise
Tue -- 10:56 PM EST     6.28 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.83.21.50.1-0.6-0.212.64.25.465.953.51.90.4-0.4-0.40.62.13.75.166.3

Tide / Current Tables for Charleston Harbor, off Fort Sumter, South Carolina Current (expired 1996-12-31)
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Charleston Harbor
Click for Map
Tue -- 01:30 AM EST     -3.14 knots Max Ebb
Tue -- 04:50 AM EST     0.01 knots Slack
Tue -- 06:45 AM EST     Sunrise
Tue -- 07:31 AM EST     2.78 knots Max Flood
Tue -- 09:01 AM EST     Moonset
Tue -- 10:47 AM EST     -0.00 knots Slack
Tue -- 01:54 PM EST     -3.05 knots Max Ebb
Tue -- 05:12 PM EST     0.01 knots Slack
Tue -- 06:17 PM EST     Sunset
Tue -- 07:55 PM EST     2.78 knots Max Flood
Tue -- 10:12 PM EST     Moonrise
Tue -- 11:13 PM EST     -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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-2.2-3-3-2.4-1.20.31.72.72.721-0.3-1.6-2.7-3-2.6-1.6-0.31.22.42.82.31.40.3

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