Friday, April3, 2020
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Marine Weather and Tides
Sullivan's Island, SC

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:02AMSunset 7:42PM Friday April 3, 2020 4:45 AM EDT (08:45 UTC) Moonrise 1:47PMMoonset 3:13AM Illumination 78% Phase: Waxing Gibbous; Moon at 10 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- 310 Am Edt Fri Apr 3 2020
Today..N winds 5 kt, becoming nw 10 kt late this morning.
Tonight..NW winds 5 to 10 kt.
Sat..N winds 5 to 10 kt, becoming ne in the afternoon.
Sat night..E winds 5 kt.
Sun..E winds 5 to 10 kt.
Sun night..SE winds 10 kt, becoming S after midnight.
Mon..S winds 5 to 10 kt.
Mon night..SW winds 10 kt. A slight chance of showers.
Tue..SW winds 10 kt. A chance of showers.
Tue night..SW winds 10 kt. A chance of showers. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 66 degrees.
AMZ300 310 Am Edt Fri Apr 3 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail into early next week. A cold front will approach the region towards 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 030745 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 345 AM EDT Fri Apr 3 2020

SYNOPSIS. High pressure will prevail into early next week. A cold front will approach the region towards the middle of next week.

NEAR TERM /THROUGH TODAY/. The synoptic pattern is nearly identical to yesterday featuring surface high pressure extending south through the Ohio and Tennessee Valleys into the Southeast U.S. with a high amplitude upper-level ridge centered along a line Hudson Bay south to the north-central Gulf of Mexico. The upper ridge will meander slowly east through the day with H8 temperatures forecast to peak 10-12C by late afternoon, or about 4C higher than Thursday. Although the day will start off rather cool, temperatures will warm quickly once the nocturnal inversion mixes out shortly after daybreak and are expected to peak in the mid-upper 70s consistent will local full sun low-level thickness schemes. Portions of Upper Charleston and eastern Berkeley Counties may only peak in the lower 70s as this region will remain under the far outer influence of the broad cyclonic flow around the deep, low pressure gyre wobbling off the Mid-Atlantic coast.

Similar to Thursday, offshore winds redeveloping during the afternoon should prevent a sea breeze circulation from forming, except along parts the Georgia coast where a weaker offshore component should allow another ill-defined circulation to develop mid-late afternoon. Sunny skies will prevail outside of some passing cirrus pushing through this morning associated with a southern stream jet streak.

SHORT TERM /TONIGHT THROUGH MONDAY/. Tonight: High pressure will remain across the Southeast U.S. tonight as the low pressure gyre off the Mid-Atlantic coast finally begins to move off the southeast. This pattern will keep a fairly loose pressure gradient across the region overnight and the boundary layer should once again decouple by mid-evening resulting in a calm/light wind field. Skies should remain clear for a good portion of the night yielding a strong radiational component, but cirrus is forecast to increase after 4-5 AM ahead of another jet streak embedded within the subtropical jet that extends across much of the southern CONUS. This could limit the full radiational potential somewhat during the diurnal minimum, especially west of I-95, but the cooler side of the 03/00z guidance was still favored to construct lows early Saturday morning. Lows will range from the upper 40s/near 50 inland to the lower-mid 50s at the coast with upper 50s along the beaches, Downtown Charleston, and around the Santee-Cooper lakes. A few mid 40s will be possible up in the Francis Marion National Forest and the far northern portions of Berkeley County north of Lake Moultrie. There could be some shallow ground fog that forms along/south of the I-16 corridor after midnight, but this have little impact.

Saturday: Surface high pressure will prevail across the Southeast, bringing our area dry conditions. Clouds should gradually increase during the day and into the night. Highs will be near normal while lows will be above normal.

Sunday: West northwest flow prevails in the mid-levels as heights gradually increase. Surface high pressure starts to move away from the Southeast. As the high moves away, moisture increases across our GA counties. There could be some light showers in these locations in the afternoon. Though, with the lack of lift, we're only going with slight chance POPs. The thunder risk is low due to very little instability. Dry conditions return during the evening and overnight hours. Heights and thickness values support highs near normal while lows will be above normal.

Monday: Mid-level ridging strengthening to our west continues the west northwest flow overhead with heights increasing. Moisture continues to gradually increase across the Southeast as surface high pressure moves further away in the Atlantic. Though, moisture isn't very impressive (PWATs ~1"). Additionally, lift isn't overly impressive, driven partially by the sea breeze. Hence, we only have slight chance POPs during the daylight hours. The thunder risk is again low due to very little instability. Heights, thickness values, and winds becoming generally S again support above normal daytime temperatures, making Monday the warmest day in the short term.

LONG TERM /MONDAY NIGHT THROUGH THURSDAY/. High pressure in the Atlantic will be pumping moisture into the Southeast. Meanwhile, a cold front will slowly approach from the northwest by the middle of next week, moving through during the second half of next week. Models vary quite a bit on the shower potential each day, so we were forced to go with a blend of the models. Generally, POPs are no higher than chance during the entire long term. Temperatures will be above normal.

AVIATION /06Z FRIDAY THROUGH TUESDAY/. VFR at KCHS and KSAV through 04/06z.

Extended Aviation Outlook: VFR through Monday. Showers could bring flight restrictions on Tuesday.

MARINE. Today: Northerly winds will back to the northwest today as high pressure holds firm and deep low pressure remains displaced well offshore of the Mid-Atlantic coast. A weak sea breeze could develop along the Georgia coast mid-late afternoon, so winds are expected to go variable and eventually southeast across the Georgia nearshore waters as this circulation tries to develop. Otherwise, winds will remain less than 15 kt, highest over the Charleston County waters, with seas 1-2 ft nearshore waters and 2-3 ft offshore waters.

Tonight: West to southwest winds will gradually veer to the northwest and north late as a weak surface rough drops south as low pressure off the Mid-Atlantic coast pushes east and well offshore of the Outer Banks. Speeds will remain less than 15 kt with seas averaging 1-2 ft nearshore waters and 2-3 ft offshore waters.

Saturday through Tuesday: High pressure will prevail into early next week. A cold front will approach the region towards the middle of next week. Winds and waves are expected to stay below Small Craft Advisory criteria throughout the extended marine forecast.

TIDES/COASTAL FLOODING. Higher than normal tide levels are expected through at least early next week due to astronomical influences from the upcoming full moon and lunar perigee as well as onshore winds and swells. Minor saltwater flooding will be possible, especially along the SC coast, around the times of mostly the morning high tides early in the week and then more likely the evening high tides toward mid week.

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
CHTS1 1 mi45 min NW 2.9 G 6 56°F 67°F1014.6 hPa (-1.2)
FBIS1 - Folly Island, SC 6 mi45 min NW 4.1 G 6 56°F 1014.9 hPa (-1.3)48°F
41029 - Capers Nearshore (CAP 2) 15 mi37 min N 14 G 18 61°F 66°F1013.6 hPa
ACXS1 - ACE Basin Reserve, SC 32 mi60 min Calm 48°F 1015 hPa45°F
41033 43 mi37 min WNW 7.8 G 9.7 62°F 65°F1013.9 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 47 mi25 min 16 G 19 66°F 70°F1013.4 hPa59°F

Wind History for Charleston, SC
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC7 mi50 minN 010.00 miFair48°F44°F87%1014.6 hPa
Mount Pleasant Regional-Faison Field, SC11 mi50 minN 010.00 miFair46°F46°F100%1014.6 hPa
Charleston, Charleston Air Force Base, SC12 mi1.8 hrsW 410.00 miFair51°F42°F71%1014.6 hPa

Link to 5 minute data for KCHS

Wind History from CHS (wind in knots)
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Last 24hrN6N6NW4NW5N6N6N6NW8NW9NW11
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NW8NW9----CalmCalmW6W3CalmW4NW4
1 day agoNW10NW10N12NW7N12N13N12N13N13N9
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N10N9N4N3CalmCalmCalmCalmNW3NW4NW3
2 days agoNW3S4CalmCalmNE4E8E11E11E9E15E13E10SE13NW14
G21
N15--W5W4W9NW9N11N12N13N15
G22

Tide / Current Tables for Fort Johnson, South Carolina
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
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Fri -- 01:08 AM EDT     1.55 knots Max Flood
Fri -- 04:12 AM EDT     Moonset
Fri -- 04:50 AM EDT     -0.00 knots Slack
Fri -- 07:04 AM EDT     Sunrise
Fri -- 08:19 AM EDT     -2.09 knots Max Ebb
Fri -- 11:27 AM EDT     0.00 knots Slack
Fri -- 01:40 PM EDT     1.33 knots Max Flood
Fri -- 02:46 PM EDT     Moonrise
Fri -- 05:13 PM EDT     -0.00 knots Slack
Fri -- 07:41 PM EDT     Sunset
Fri -- 08:41 PM EDT     -2.02 knots Max Ebb
Fri -- 11:37 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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1.21.51.40.90.5-0.1-1-1.7-2.1-1.9-1.3-0.40.51.21.310.60.2-0.6-1.4-1.9-2-1.5-0.6

Weather Map
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wmap_A
GEOS Local Image of Southeast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (4,6,7,8)
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Ground Weather Radar Station Charleston, SC
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.