Thursday, February25, 2021
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Marine Weather and Tides
Charleston, 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 6:50AMSunset 6:15PM Thursday February 25, 2021 11:16 AM EST (16:16 UTC) Moonrise 4:34PMMoonset 6:00AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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- 1004 Am Est Thu Feb 25 2021
Rest of today..W winds 5 kt, becoming S late.
Tonight..E winds 5 to 10 kt, becoming ne 10 to 15 kt after midnight.
Fri..NE winds 15 to 20 kt. Waves 1 to 2 ft. A slight chance of showers in the morning, then a chance of showers in the afternoon.
Fri night..E winds 10 to 15 kt, becoming se 5 to 10 kt after midnight. A slight chance of showers.
Sat..SW winds 5 to 10 kt, becoming S 10 to 15 kt in the afternoon.
Sat night..S winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight.
Sun..S winds 10 to 15 kt. A slight chance of showers.
Sun night..SW winds 15 kt. A slight chance of showers.
Mon..SW winds 10 to 15 kt. A chance of showers.
Mon night..N winds 10 to 15 kt. A chance of showers. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 52 degrees.
AMZ300 1004 Am Est Thu Feb 25 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure today will give way to a weak cold front approaching from the north tonight before stalling out. A wave of low pressure could impact the region Friday into Friday night. The next frontal system appears to approach the area early next week, followed by another system by mid-week.


7 Day Forecast for Marine Location Near Charleston, SC
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location: 32.78, -79.93     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 251520 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1020 AM EST Thu Feb 25 2021

SYNOPSIS. High pressure today will give way to a weak cold front approaching from the north tonight before stalling out. A wave of low pressure could impact the region Friday into Friday night. The next frontal system appears to approach the area early next week, followed by another system by mid-week.

NEAR TERM /THROUGH TONIGHT/. Late morning update: The day is on track to be warm, dry and mostly sunny. Updated temperatures and dewpoints with current observations. Did increase the temps by a degree in some places to follow the warmer trend we have seen through the morning. The backdoor cold front will continue to sink closer to the area over the next few hours.

A backdoor cold front will approach the forecast area through early/mid afternoon. High resolution guidance indicates that sfc high pressure centered over the mid-Atlantic states will surge SW along the Southern Appalachians late this afternoon into tonight. Based on this timing, the forecast area should experience rising llvl thicknesses through most of the day, remaining south of the front. The combination of mostly to partly sunny sky, WSW winds, and rising thicknesses will likely result in high temperatures at or 1-2 degrees warmer than values reached yesterday. Using the warmer temperature guidance and a look at highs yesterday, temperatures this afternoon are forecast to range from the mid 70s across the CHS Tri-county to the upper 70s across SE GA.

Tonight: Sfc high pressure will continue to increase across the CWA through the night. The greatest pressure rises will remain along the east facing slopes of the Appalachians, resulting from increasing CAD. Pressure rises could surge late tonight if precipitation breaks out across the Carolina Foothills after midnight, latest models runs indicate little to no precipitation before the pre-dawn hours. Even given dryer conditions to the west, the sfc high is expected to push the backdoor cold front south of the Savannah River, before the front begins to stall around daybreak Friday. Forecast soundings indicated very limited moisture below H75 across the SC Lowcountry late tonight. Given the limited moisture, PoPs will remain below 15 percent through tonight. Using a blend of MOS, low temperatures are forecast to range generally in the low 50s, upper 40s across portions of Berkeley County.

SHORT TERM /FRIDAY THROUGH SUNDAY/. Friday: A surface wave to the west caused by a potent upper-level shortwave will propagate over the region Friday; deamplifying as it does so. The strongest DPVA will remain to our north as the shortwave energy weakens and lifts. Meanwhile, a warm front will gradually lift north as well and correspondingly isentropic ascent will strengthen through the day. Showers could develop over the Charleston Tri-County region and possibly brushing our extreme inland counties Friday afternoon into Friday night where the combination of forcing for ascent overlaps with the deeper moisture. As of now, our southeast Georgia counties reflect a rain-free forecast while the rest of our forecast area has slight chance POPs topping out at 40%. Guidance has been consistently raising temperatures, thus we could see slightly above average temperatures through the period. On Friday, a decent temperature gradient is expected to set up due to a cold front stalling over the Southeast as well as from differential cloud cover; therefore max temps in the Charleston Tri-County area may only reach 65F whereas max temps south of I-16 could easily reach 75F. Min temps will range from the low to mid 50s Friday night.

Saturday and Sunday: With a warm front well to our north and as isentropic lift decreases, surface high pressure and upper ridging over the Southeast Atlantic will build over the region through the weekend. As clouds decrease through the day Saturday, partly sunny skies and weak subsidence will allow temperatures to increase, moderating to the mid/upper 70s, with cooler temps along the beaches; upper 60s. Min temps will only drop to the low 60s Saturday night. On Sunday, a broad area of low-end slight chance POPS covers most of the forecast area due to some indication of weak shortwave energy rippling through the ridge. As increasing moisture feeds into the area via southwesterly winds, isolated light showers could develop. However, weak DPVA will be battling areas of subsidence and pockets of drier air, which will likely keep rainfall to a minimum if any at all occurs. Otherwise, Sunday will be even warmer despite mostly cloudy skies with temps reach the upper 70s/low 80s, again with temps along the beaches topping out around 70F.

LONG TERM /SUNDAY NIGHT THROUGH WEDNESDAY/. A cold front appears to approach the area from the west on Monday. Showers and a possible thunderstorm could develop along and ahead of the front Monday afternoon into Monday night. Temperatures will cool in the wake of the cold front before they begin a gradual increase through the week. The next system looks to be low pressure forming in the Gulf of Mexico, which could bring scattered showers to the area Wednesday into Thursday.

AVIATION /15Z THURSDAY THROUGH MONDAY/. A backdoor cold front will approach the region through early to mid afternoon. Winds ahead of the front will remain from the W between 5-10 kts. The sfc front is timed to reach KCHS this evening and KSAV by 10Z Friday, resulting in winds shifting from the ENE. Increasing moisture and weak forcing may support MVFR ceilings over KCHS just before sunrise Friday.

Extended Aviation Outlook: Flight restrictions are possible Friday through Friday night, and again late Sunday into Monday night due to potential low stratus/showers.

MARINE. Today: A backdoor cold front will approach the coastal waters through early to mid afternoon. Winds ahead of the front will remain from the SW between 5-10 kts. The sfc front is timed to reach the northern portion of the Charleston County nearshore waters by late this afternoon into early evening, resulting in winds shifting from the ENE. Seas should remain between 1-2 ft.

Tonight: The backdoor cold front is forecast to gradually push south down the SC coast this evening, expected to stall over the GA waters. Winds should remain the greatest over AMZ350 with NE winds gusting around 20 kts. Seas should build to around 3 ft across AMZ350, remaining between 1-2 ft across the rest of the nearshore and outer waters.

Friday through Tuesday: As a cold front stalls over the waters winds will shift out of the northeast early Friday, briefly increasing to 15 to 20 kt mainly over the South Carolina nearshore waters. The slight uptick in winds will cause seas to build to 2-4 ft, however, conditions should remain below Small Craft Advisory criteria. Winds will then decrease Saturday over the waters as high pressure builds and veers out of the S/SW before conditions deteriorate Sunday night ahead of an approaching cold front from the west. Small Craft Advisories could be needed for some portions of the waters Sunday night into Tuesday mainly for 6-7 foot seas and possible 25 kt gusts.

There could be a risk for reduced visibilities in low stratus Friday into early Saturday, and again Sunday due to actual sea fog 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 Friday morning high tide. Current forecast for Friday morning high tide is 6.9 and have added mention in the Hazardous Weather Outlook.

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



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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 0 mi47 min WSW 5.1 G 8 67°F 53°F1021.5 hPa
FBIS1 - Folly Island, SC 7 mi77 min SSW 7 G 8.9 56°F 1022.3 hPa (+1.7)
41029 - Capers Nearshore (CAP 2) 16 mi24 min SSW 9.7 G 12 55°F 53°F1021.2 hPa
ACXS1 - ACE Basin Reserve, SC 32 mi92 min WSW 1 63°F 1022 hPa49°F
41033 43 mi69 min SW 5.8 G 7.8 56°F 54°F1021.6 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC7 mi22 minW 76.00 miFair with Haze70°F45°F40%1021.3 hPa
Charleston, Charleston Air Force Base, SC10 mi21 minVar 510.00 miA Few Clouds72°F42°F34%1021 hPa
Mount Pleasant Regional-Faison Field, SC11 mi22 minN 09.00 miFair68°F46°F46%1021.3 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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Last 24hrCalmSE8S8S9S11S10S8S4S6S5S4SW5SW4SW5CalmSW4SW3W5CalmCalm--CalmSW44
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SW7SW7S4SW5SW4SW3SW4W4SW6W6W4CalmCalmW4W3W9W12NW10

Tide / Current Tables for Charleston, South Carolina
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Charleston
Click for Map
Thu -- 12:05 AM EST     -0.20 feet Low Tide
Thu -- 05:59 AM EST     Moonset
Thu -- 06:22 AM EST     5.66 feet High Tide
Thu -- 06:51 AM EST     Sunrise
Thu -- 12:44 PM EST     0.07 feet Low Tide
Thu -- 04:34 PM EST     Moonrise
Thu -- 06:13 PM EST     Sunset
Thu -- 06:43 PM EST     4.90 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.20.21.22.74.15.15.65.54.83.72.41.20.30.10.71.83.14.14.74.94.43.42.10.8

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Thu -- 12:37 AM EST     0.00 knots Slack
Thu -- 03:11 AM EST     1.74 knots Max Flood
Thu -- 05:59 AM EST     Moonset
Thu -- 06:51 AM EST     Sunrise
Thu -- 07:01 AM EST     -0.00 knots Slack
Thu -- 10:13 AM EST     -2.44 knots Max Ebb
Thu -- 01:22 PM EST     0.00 knots Slack
Thu -- 03:37 PM EST     1.46 knots Max Flood
Thu -- 04:33 PM EST     Moonrise
Thu -- 06:13 PM EST     Sunset
Thu -- 07:13 PM EST     -0.00 knots Slack
Thu -- 10:27 PM EST     -2.40 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.60.41.31.71.61.30.90-1-1.9-2.4-2.2-1.4-0.40.61.31.41.20.90.2-0.8-1.7-2.3-2.3

Weather Map
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