Wednesday, February24, 2021
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Marine Weather and Tides
Seabrook 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 6:51AMSunset 6:14PM Wednesday February 24, 2021 12:55 PM EST (17:55 UTC) Moonrise 3:31PMMoonset 5:14AM Illumination 95% 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- 1025 Am Est Wed Feb 24 2021
Rest of today..SW winds 5 kt, increasing to 10 kt this afternoon.
Tonight..SW winds 5 to 10 kt.
Thu..W winds 5 to 10 kt, becoming sw in the afternoon.
Thu night..NE winds 5 to 10 kt.
Fri..NE winds 10 to 15 kt, becoming E 15 to 20 kt in the afternoon. Waves 1 to 2 ft. A slight chance of showers.
Fri night..E winds 10 to 15 kt with gusts to 20 kt, becoming se after midnight. A slight chance of showers.
Sat..SW winds 10 kt. A slight chance of showers.
Sat night..S winds 5 to 10 kt.
Sun..S winds 10 to 15 kt.
Sun night..S winds 10 to 15 kt. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 52 degrees.
AMZ300 1025 Am Est Wed Feb 24 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail through Thursday. A backdoor cold front could move into the area Thursday night followed by a wave of low pressure along the front that could impact the region Friday and Friday night. High pressure will prevail Saturday, before a frontal system impacts the area early next week.


7 Day Forecast for Marine Location Near Seabrook Island, SC
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location: 32.6, -80.13     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 241551 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1051 AM EST Wed Feb 24 2021

SYNOPSIS. High pressure will prevail through Thursday. A backdoor cold front could move into the area Thursday night followed by a wave of low pressure along the front that could impact the region Friday and Friday night. High pressure will prevail Saturday, before a frontal system impacts the area early next week.

NEAR TERM /THROUGH TONIGHT/. Today: Dry and mild conditions are expected across the region while the area remains along the northern fringes of weak high pressure extending across the northern Gulf of Mexico and into the western Atlantic. Aloft, the flow will remain zonal, producing a westerly flow and downsloping wind component across southeast South Carolina and southeast Georgia throughout the day. The latest 12Z CHS sounding indicates deep layered dry air, supportive of cloud free skies throughout the afternoon and evening. 1000-850 mb thickness levels suggest overall high temps in the low-mid 70s this afternoon, warmest away from the beaches. However, strong sfc heating, a light southwest/south sfc wind, and the downsloping wind component could produce sfc temps a few degrees warmer than currently forecast, especially across southern most zones in southeast Georgia.

Tonight: A cold front is expected to approach the area from the north. A few high clouds ahead of the cold front could reach the area during the pre-dawn hours. However, most of the night should remain clear. The pressure gradient should become sufficiently enhanced to support light SW winds ahead of the front through the night. Low temperatures should generally range in the mid 40s, with high 40s expected along the coast.

SHORT TERM /THURSDAY THROUGH SATURDAY/. Surface high pressure will prevail over the Southeast and west- northwesterly quasi-zonal flow aloft will maintain a tranquil weather pattern. Sunny skies and mild temperatures are expected once again on Thursday. A weak back door cold front will approach from the north late Thursday night before stalling/dissipating, at which point models have difficulty pinpointing the location of its southern progression. A wave to the southwest caused by a moderately amplified mid-level shortwave will propagate over the region Friday evening potentially bringing showers; however, models disagree on how far south DPVA extends into our forecast area. Isentropic ascent will strengthen through the evening Friday, which increases the chances for showers especially where upper-level forcing overlaps. As of now, our southeast Georgia counties should stay dry while the rest of our forecast area could see some light showers since decent forcing is located further to the north. Lingering moisture will continue to pose potential for showers through Saturday morning. As isentropic ascent weakens throughout the day Saturday and the shortwave moves offshore, high pressure and will briefly build over the region.

Highs in the low 70s Thursday will be a touch cooler on Friday. A decent temperature gradient could set up depending on where the cold front settles; therefore max temps in the Charleston Tri-County area may struggle to reach 60F whereas max temps south of I-16 could reach as high as 70F. By Saturday, temps will moderate to the upper 60s/low 70s. Min temps will range in the upper 40s to mid 50s Thursday and Friday night.

LONG TERM /SATURDAY NIGHT THROUGH TUESDAY/. The next system looks to approach Sunday night with potentially another round of showers developing ahead of a potent cold front which would affect the region Monday into early Tuesday morning. Mild temperatures are on tap through Monday with highs in the mid to upper 70s and lows in the 50s, with Sunday and Monday being the warmest as warm air advection strengthens along with the northward advancement of a warm front. Temperatures will cool in the wake of the cold front as high pressure gradually builds through the rest of the week.

AVIATION /16Z WEDNESDAY THROUGH SUNDAY/. VFR conditions will prevail at both CHS and SAV terminals through 12Z Thursday.

Extended Aviation Outlook: VFR through Thursday night. Potential for flight restrictions at times Friday night through Saturday morning and again on Monday.

MARINE. Today and Tonight: The area will remain along the northern fringes of weak high pressure extending across the western Atlantic. The pattern should yield steady southwest/south winds between 5-10 kt across most waters with occasional gusts up to 15 kt across northern SC waters where the pressure gradient is strongest. Seas will range between 1-2 ft through early evening, then potentially build up to 2-3 ft across northern SC waters and offshore GA waters tonight.

Thursday through Monday: A broad area of high pressure will prevail through Thursday night resulting in tranquil seas and W/SW winds through much of the night. A weak backdoor cold front could slowly drop into the waters from the north late Thursday night. Due to its weak nature, there is little confidence as to how far south the front will sag. As of now, it looks like mainly the South Carolina nearshore waters would be affected, which would shift winds out of the northeast early Friday, briefly increasing to 15 to 20 kt. The uptick in winds will cause seas to build to 3-5 ft, however, conditions should remain just shy of Small Craft Advisory criteria.

Winds will then briefly decrease over the waters and veer south- southwest Saturday before winds and seas pick up again Sunday night ahead of a disturbance. Small Craft Advisories could be needed for some portions of the waters Sunday night into Monday.

There could be a risk for reduced visibilities in low stratus Friday into early Saturday, and maybe again due to actual sea fog Sunday, if the wind fields aren't too strong.

TIDES/COASTAL FLOODING. Astronomical influences will support a potential for shallow coastal flooding concerns late in the week and early next week, due to the upcoming Full Moon on the 27th, and the perigee of March 2nd. The chance of any issues would mainly be in the Charleston area starting with the first high tide on Friday.

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



NEAR TERM . DPB SHORT TERM . BRM LONG TERM . BRM AVIATION . NED MARINE . BRM/DPB TIDES/COASTAL FLOODING .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 14 mi55 min SSW 6 G 7 57°F 1022.4 hPa (-0.5)
ACXS1 - ACE Basin Reserve, SC 17 mi70 min SSE 1 69°F 1022 hPa43°F
CHTS1 17 mi61 min E 7 G 7 59°F 52°F1021.9 hPa
41033 27 mi47 min SSW 5.8 G 7.8 56°F 54°F1022 hPa
41029 - Capers Nearshore (CAP 2) 30 mi47 min S 7.8 G 9.7 55°F 53°F1021.6 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC10 mi60 minSE 57.00 miFair70°F46°F43%1022 hPa
Charleston, Charleston Air Force Base, SC22 mi59 minSW 610.00 miFair72°F35°F26%1021.3 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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S7SW6SW5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW3CalmCalmSE8
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SW7SW7S4SW5SW4SW3SW4W4SW6W6W4CalmCalmW4W3W9W12NW10NW8
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NE11NE9NE6NE10NE9NE8E11NW5NW4N3CalmCalmCalm--S5S11S12
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Tide / Current Tables for Kiawah River Bridge, South Carolina
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Kiawah River Bridge
Click for Map
Wed -- 05:13 AM EST     Moonset
Wed -- 05:47 AM EST     5.77 feet High Tide
Wed -- 06:53 AM EST     Sunrise
Wed -- 12:04 PM EST     0.35 feet Low Tide
Wed -- 03:30 PM EST     Moonrise
Wed -- 06:09 PM EST     4.89 feet High Tide
Wed -- 06:14 PM EST     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.31.12.43.84.95.65.85.34.33.11.80.80.40.71.62.83.84.54.94.73.92.71.50.4

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
Wed -- 12:11 AM EST     0.00 knots Slack
Wed -- 02:55 AM EST     1.90 knots Max Flood
Wed -- 05:13 AM EST     Moonset
Wed -- 06:32 AM EST     -0.00 knots Slack
Wed -- 06:52 AM EST     Sunrise
Wed -- 09:40 AM EST     -2.19 knots Max Ebb
Wed -- 01:05 PM EST     0.00 knots Slack
Wed -- 03:26 PM EST     1.47 knots Max Flood
Wed -- 03:28 PM EST     Moonrise
Wed -- 06:12 PM EST     Sunset
Wed -- 06:39 PM EST     -0.00 knots Slack
Wed -- 09:44 PM EST     -2.15 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.20.91.71.91.71.20.5-0.5-1.5-2.1-2.2-1.9-1.1-0.10.91.41.41.10.5-0.3-1.3-2-2.1-1.8

Weather Map
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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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