Thursday, July29, 2021
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Marine Weather and Tides
Sullivan's 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 6:30AMSunset 8:21PM Thursday July 29, 2021 4:26 AM EDT (08:26 UTC) Moonrise 11:02PMMoonset 10:59AM Illumination 75% Phase: Waning Gibbous; Moon at 20 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- 321 Am Edt Thu Jul 29 2021
Today..NE winds 5 kt, becoming E early this afternoon, then se 10 to 15 kt late.
Tonight..S winds 5 to 10 kt.
Fri..SW winds 10 kt, increasing to 15 to 20 kt with gusts to 25 kt in the afternoon. Waves 1 to 2 ft.
Fri night..SW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Waves 1 to 2 ft early.
Sat..SW winds 10 to 15 kt. A slight chance of showers and tstms in the afternoon.
Sat night..SW winds 10 to 15 kt. A chance of showers and tstms.
Sun..SW winds 10 to 15 kt. A chance of showers and tstms.
Sun night..SW winds 10 to 15 kt. Showers and tstms likely.
Mon..SW winds 10 to 15 kt. Showers and tstms.
Mon night..SW winds 10 to 15 kt. 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 84 degrees.
AMZ300 321 Am Edt Thu Jul 29 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will build over the area through Saturday. A cold front will stall over or just north of the area Sunday through the middle of next week.


7 Day Forecast for Marine Location Near Sullivan's Island, SC
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location: 32.77, -79.91     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 290801 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 401 AM EDT Thu Jul 29 2021

. HOT AND HUMID CONDITIONS WITH EXCESSIVE HEAT POSSIBLE THROUGH SUNDAY .

SYNOPSIS. High pressure will build over the area through Saturday. A cold front will stall over or just north of the area Sunday through the middle of next week.

NEAR TERM /THROUGH TONIGHT/. Through Sunrise: Patchy to areas of fog will gradually expand across the interior through sunrise. Condensation pressure deficits are only marginally favorable for significant fog formation, but vsby 2-4 miles are likely with some localized patches of dense fog with vsby 1/4 mile or less possible near bodies of water and other low-lying areas.

Today: Mid-level heights will steadily rise today as the large anticyclone centered over the Central Plains builds into the Southeast U.S and Deep South. An expansive area of dry air noted on GOES-E water vapor imagery will remain across the area through the afternoon. This dry air will essentially limit the convective potential as any moist updrafts that area able form ahead of the afternoon sea breeze will quickly get choked off due to dry air entrainment. There is a weak signal in a few of the CAMs that enough low-level moisture and H8 theta-e could be present to allow for a shower or two to spark across far interior Southeast Georgia in the Millen-Metter-Reidsville- Ludowici corridor during peak heating, but any such shower activity will be likely very short lived due to the reason noted above. The risk for any measurable rainfall in this area is likely to low to justify a mentionable pop.

Highs will range from the lower-mid 90s inland to the mid 80s at the beaches. Dewpoints are expected to mix out into the lower 70s across the interior, but should hold in the mid-upper 70s across the coastal counties as the sea breeze moves inland. Would not be surprised to see a few spots in the coastal corridor from Beaufort to Charleston see dewpoints briefly hit the 80 degree mark. Heat index values are expected to peak 103-107 (highest across the coastal counties inland from the beaches) which is below the local July Heat Advisory criteria of 110.

Tonight: Clear skies and dry conditions will prevail. While winds across the interior are likely to decouple, winds may stay up a bit across the coastal counties through the night as the pressure gradient is expected to tighten a bit as lee-side troughing develops to the west. Lows will range from the mid 70s inland to the lower 80s at the beaches and Downtown Charleston.

SHORT TERM /FRIDAY THROUGH SUNDAY/. The mid-levels will consist of a long-wave trough to our north and a strong and broad ridge to our west on Friday. The trough will strengthen/amplify with time, pushing the ridge further to the west.

Friday: High pressure will prevail across our area during the day with fair weather clouds. A cold front will approach from the north/northwest at night, but it's not expected to reach our area. Models are in great agreement, keeping the area dry during the day. Some of them hint at weakening convection maybe making it into the Charleston Tri-County during the evening/overnight, then dissipating. But given the dry air, we leaned towards a dry forecast at night. Thickness values and 850 mb temperatures will yield temperatures well above normal. High temperatures are forecasted to be the hottest of the summer. Most locations will be in the upper 90s with several spots inland expected to hit the 100 degree mark. Even the beaches won't be much lower, generally being in the lower 90s. Dew points will vary across our area. Far inland, they'll be in the lower 70s as some drier air mixes in from the northwest. Closer to the coast, they'll rise to at least the mid 70s in the afternoon. They'll be even higher along the immediate coast upper 70s to near 80 degrees) where a pinned sea breeze will allow them to pool. The combination of the heat and humidity will result in the highest heat indices so far this summer. Heat indices above 110 degrees are expected for our coastal counties and the CHS and SAV metro areas. Heat Advisories would be needed for these locations. Farther inland, if more dry air mixes in both the dew points and heat indices would be a few degrees lower, which would be just short of Advisory criteria. Even the night will be steamy, with some locations not falling too far below the 80 degree mark. Temperature records for the hottest nights could be in jeopardy.

Saturday: The cold front will stall over or just north of our area. But moisture will increase with time. Most of the models have dry conditions persisting across our area during the morning and the early afternoon. Then, they have convection developing along the front and the sea breeze late in the day and into the evening. It appears the best convective potential will be across our SC counties, aided by the proximity of the front and the sea breeze. A few pulse severe thunderstorms are possible with damaging wind gusts. But these details will need to be refined in future forecast. Highs again will be well above normal, in the mid to upper 90s. Lows will also be a few degrees above normal.

Sunday: There is the potential for another day with above normal temperatures. But this will all depend on the afternoon convection or lack of. Models differ on the convective potential and its placement. For now, we stayed consistent with our neighboring offices and all went with the NBM.

LONG TERM /SUNDAY NIGHT THROUGH WEDNESDAY/. The models have been persistent showing a mid-level trough amplifying/strengthening across the eastern half of the country next week. The surface pattern forecast from the WPC has a front just to our north. As a result, the NBM has a wet pattern for our area next week. The wettest conditions should be during the daytime hours. High temperatures are forecasted to be below normal.

AVIATION /06Z THURSDAY THROUGH MONDAY/. Fog is the main concern at all three terminals through sunrise. Shallow ground of is already in progress at a number of locations early this morning and will likely thicken to at least MVFR at KCHS, KJZI and KSAV over the coming hours. Prevailing MVFR vsbys will be highlighted roughly 08-09z through 1130z. There are signals that a low cloud deck with cigs around 2000 ft could briefly develop and mainly impact KCHS and KJZI just before sunrise. The cloud deck is not as likely to impact KSAV. The fog and low clouds will quickly burn off after sunrise leaving only a shallow cumulus field which will get cleared out during the afternoon with the passage of the sea breeze.

Extended Aviation Outlook: Flight restrictions are possible in showers and thunderstorms late Saturday through Monday.

MARINE. Today: Northeast winds this morning will veer to the southeast this afternoon a sea breeze develops and moves inland. Winds will generally remain 10 kt or less with seas 1-2 ft.

Tonight: South to southwest winds will pick up to 10-15 kt overnight in response to lee-side troughing that develops well to the west. Seas will average 1-2 ft.

Friday through Monday: Winds are expected to increase Friday and Friday night as a cold front approaches from the north/northwest. Wind gusts could hit 25 kt in the Charleston Harbor Friday afternoon and evening, so a Small Craft Advisory may be needed for them. Wind gusts across the rest of our coastal waters appear to be just short of 25 kt through Friday night. But if they rise a few kt, then Small Craft Advisories will also be needed in these zones. The front should remain over or just to our north this weekend into early next week. During that time frame, each afternoon expect slight backing of the winds and higher gusts associated with the sea breeze along the land/sea interface and in the Charleston Harbor. Each night, expect slight veering of the winds.

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
FBIS1 - Folly Island, SC 6 mi86 min NNW 4.1 G 4.1 79°F 1015.7 hPa (-1.3)
41029 - Capers Nearshore (CAP 2) 15 mi78 min N 1.9 G 5.8 81°F 82°F1014.4 hPa
41065 16 mi38 min 82°F2 ft
ACXS1 - ACE Basin Reserve, SC 32 mi101 min Calm 76°F 1016 hPa76°F
41033 43 mi78 min NE 3.9 G 5.8 82°F 83°F1014.2 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 47 mi36 min S 1.9 G 3.9 81°F 2 ft1014.3 hPa77°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC7 mi31 minN 06.00 miFog/Mist77°F77°F100%1014.6 hPa
Mount Pleasant Regional-Faison Field, SC11 mi31 minN 03.00 miFog/Mist75°F75°F100%1014.6 hPa
Charleston, Charleston Air Force Base, SC12 mi30 minWNW 57.00 miShallow Fog75°F74°F96%1014.4 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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Last 24hrCalmCalmCalmSW3W9W6NW5W5W5NW4NW3N53E4CalmE5CalmCalmCalmCalmCalmCalmW3Calm
1 day agoCalmCalmCalmE4S9E6SW4CalmCalmSE4SE6SE5SE9SE64SE5SE34SE7SE10SW3
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2 days agoCalm--CalmCalmE7N5E8NE6E8SE7E7SE9E9SE564S5S5SE4SE10
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Tide / Current Tables for Charleston, South Carolina
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Charleston
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Thu -- 12:33 AM EDT     5.43 feet High Tide
Thu -- 06:31 AM EDT     Sunrise
Thu -- 06:39 AM EDT     0.30 feet Low Tide
Thu -- 11:59 AM EDT     Moonset
Thu -- 01:00 PM EDT     5.14 feet High Tide
Thu -- 06:58 PM EDT     0.89 feet Low Tide
Thu -- 08:20 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.35.44.83.72.51.30.50.3123.24.24.95.14.94.1321.20.91.22.13.14

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
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Thu -- 12:53 AM EDT     -0.00 knots Slack
Thu -- 04:11 AM EDT     -2.14 knots Max Ebb
Thu -- 06:31 AM EDT     Sunrise
Thu -- 07:20 AM EDT     0.00 knots Slack
Thu -- 09:35 AM EDT     1.42 knots Max Flood
Thu -- 11:59 AM EDT     Moonset
Thu -- 01:20 PM EDT     -0.00 knots Slack
Thu -- 04:37 PM EDT     -1.85 knots Max Ebb
Thu -- 07:48 PM EDT     0.00 knots Slack
Thu -- 08:19 PM EDT     Sunset
Thu -- 09:58 PM EDT     1.19 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.7-0.1-1-1.7-2.1-1.9-1.2-0.30.61.31.41.20.90.3-0.5-1.3-1.7-1.8-1.4-0.70.20.91.21

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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