Saturday, July4, 2020
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Marine Weather and Tides
Summerville, 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 6:15AMSunset 8:34PM Saturday July 4, 2020 1:45 AM EDT (05:45 UTC) Moonrise 7:24PMMoonset 4:34AM Illumination 98% 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- 1237 Am Edt Sat Jul 4 2020
Rest of tonight..SW winds 5 kt.
Sat..W winds 5 kt, becoming S in the afternoon.
Sat night..S winds 5 to 10 kt, diminishing to 5 kt after midnight.
Sun..E winds 5 kt, becoming se in the afternoon.
Sun night..SE winds 10 kt, diminishing to 5 kt after midnight. A slight chance of showers and tstms after midnight.
Mon..SE winds 5 to 10 kt. A chance of showers and tstms.
Mon night..S winds 5 to 10 kt. A chance of showers and tstms.
Tue..S winds 5 to 10 kt. A chance of showers and tstms.
Tue night..SW winds 5 to 10 kt. A chance of showers and tstms.
Wed..SW winds 5 to 10 kt. A chance of showers and tstms.
Wed night..SW winds 5 to 10 kt. A chance of 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 1237 Am Edt Sat Jul 4 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A stationary front will linger south of the area into this weekend. A coastal low will then bring unsettled weather to the region during the early to middle part of next week.


7 Day Forecast for Marine Location Near Summerville, SC
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location: 32.96, -80.2     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 040442 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1242 AM EDT Sat Jul 4 2020

SYNOPSIS. A stationary front will linger south of the area into this weekend. A coastal low will then bring unsettled weather to the region during the early to middle part of next week.

NEAR TERM /UNTIL 6 AM THIS MORNING/. Overnight: A stationary front will be located to our south with weak high pressure over the area. The high will bring us dry conditions, with light or calm winds, allowing for most lows in the lower or middle 70s. However, parts of the northwest tier will drop to 70F, while a few upper 60s will occur in the Francis Marion National Forest. Areas of stratus and at least ground fog will form, and we might need to add mention of the fog in future updates.

SHORT TERM /6 AM THIS MORNING THROUGH MONDAY/. On Independence Day, the sfc pattern should feature a stationary front running along the Gulf Coast and northern FL with weak high pressure ridging inland across SE GA and SC. This pattern should support steady SE winds during through much of the daylight hours. A sea breeze is expected to develop during the early afternoon, slowly advancing inland during the afternoon and evening. Forecast soundings indicated weak instability with a thin layer of CIN lingering into the mid to late afternoon. Given the timing of the sea breeze and weak instability, isolated showers and thunderstorms are possible during the mid to late afternoon. High temperatures are forecast to range from the mid 90s inland to around 90 along the coast. Isolated convection should end during the early evening. Low temperatures should remain within the low to mid 70s.

A broad mid-level trough will remain across the lower Mississippi Valley on Sunday. A frontal wave is forecast to develop over the Mississippi Delta, resulting in the front from AL to FL to lift slowly north. Deeper moisture and instability is expected to increase over SE GA Sunday afternoon. Also, steady SE winds should result in a slow sea breeze advancing inland during the afternoon. The forecast will feature scattered showers and thunderstorms across extreme SE GA with isolated convection along and west of the sea breeze. Temperatures should generally range in the low 90s.

The plume of moisture that has remained over the Deep South is expected to lift north across the forecast area Sunday night into Monday. A weak front should approach from the south on Monday, perhaps serving as a focus for convection. The combination of the deep moisture, weak to moderate instability, and the approaching front should yield at least numerous showers and thunderstorms during the daylight hours Monday. High temperatures will likely be limited by thick cloud cover and the high coverage of convection, most areas in the mid to upper 80s.

LONG TERM /MONDAY NIGHT THROUGH FRIDAY/. A more unsettled pattern is expected for the long term period. An area of low pressure is forecast to lift from the Gulf Coast states into or near the area through mid-week. The low will linger in the vicinity through Thursday. Details are yet to be determined as there is discrepancy between models regarding the location of the low, however the highest rain chances appear to be Tuesday and Wednesday. Will need to look out for the potential for flooding. High temperatures are forecast to be a few degrees below normal with clouds and rain around, while lows are forecast to stay slightly above normal.

AVIATION /06Z SATURDAY THROUGH WEDNESDAY/. Outside of any possible brief flight restrictions in light fog and/or stratus/stratocumulus around 09-13Z, solid VFR will dominate at KCHS and KSAV.

Extended Aviation Outlook: VFR is expected through much of the weekend. The chance for flight restrictions in showers/thunderstorms will increase early next week.

MARINE. Tonight: A stationary front will be located to our south while a weak high will be over our area. Expect mostly SE winds across the GA waters while the SC waters should see S winds veering to the SW by daybreak Saturday. Sustained winds will be no more than 5 or 10 kt with seas averaging 1-2 ft.

Saturday through Wednesday: A stalled front will linger south of the waters this weekend, lifting north across the waters by Monday. Low pressure is then expected to impact the region towards the middle of the week. There is low forecast confidence with the position and strength of the low pressure during the mid-week. At this point, marine conditions are forecast to stay below Small Craft Advisory criteria through the period.

TIDES/COASTAL FLOODING. Astronomical influences will maintain higher than normal tide levels into early next week. Minor coastal flooding will be possible around the time of the evening high tides, primarily along the South Carolina coast. In addition, the risk for heavy rain will only add to any tidal flooding early next week.

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

NEAR TERM . SHORT TERM . LONG TERM . ETM AVIATION . MARINE . TIDES/COASTAL FLOODING .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 19 mi52 min SW 2.9 G 5.1 81°F 84°F1013.8 hPa
FBIS1 - Folly Island, SC 25 mi46 min SW 6 G 7 80°F 1014.2 hPa (+0.0)
ACXS1 - ACE Basin Reserve, SC 31 mi61 min Calm 76°F 1014 hPa75°F
41029 - Capers Nearshore (CAP 2) 32 mi38 min WSW 7.8 G 9.7 81°F 83°F1013.5 hPa
41033 48 mi38 min SSW 5.8 G 9.7 81°F 82°F1013.4 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Summerville Airport, SC8 mi51 minN 010.00 miMostly Cloudy75°F73°F94%1013.5 hPa
Charleston, Charleston Air Force Base, SC10 mi1.8 hrsSSW 310.00 miPartly Cloudy78°F72°F82%1013.3 hPa
Moncks Corner Berkeley County, SC18 mi51 minN 02.00 miFog/Mist72°F71°F100%1013.9 hPa
Charleston Executive Airport, SC21 mi51 minN 010.00 miA Few Clouds75°F73°F94%1013.9 hPa
Mount Pleasant Regional-Faison Field, SC23 mi51 minN 07.00 miFair73°F73°F100%1013.5 hPa
Walterboro Lowcountry Regional Airport, SC24 mi71 minN 010.00 miFair73°F71°F94%1014.2 hPa

Link to 5 minute data for KDYB

Wind History from DYB (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm4NE4CalmCalmCalmNE35S6CalmCalmCalmCalmCalm
1 day agoSW3CalmCalmCalmCalmW3W5Calm5CalmN6NE56N4N7N6NE5
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2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmW6W55W7CalmCalmCalmNE5CalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for Bacon Bridge, Ashley River, South Carolina
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Bacon Bridge
Click for Map
Sat -- 05:34 AM EDT     Moonset
Sat -- 05:40 AM EDT     -0.04 feet Low Tide
Sat -- 06:17 AM EDT     Sunrise
Sat -- 10:36 AM EDT     1.86 feet High Tide
Sat -- 05:40 PM EDT     -0.17 feet Low Tide
Sat -- 08:24 PM EDT     Moonrise
Sat -- 08:33 PM EDT     Sunset
Sat -- 11:15 PM EDT     2.43 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.21.81.30.80.30-00.30.91.41.81.81.71.410.50.1-0.1-0.10.20.91.62.12.4

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Sat -- 02:33 AM EDT     0.00 knots Slack
Sat -- 04:34 AM EDT     1.52 knots Max Flood
Sat -- 05:33 AM EDT     Moonset
Sat -- 06:16 AM EDT     Sunrise
Sat -- 08:21 AM EDT     -0.00 knots Slack
Sat -- 11:38 AM EDT     -2.43 knots Max Ebb
Sat -- 02:36 PM EDT     0.00 knots Slack
Sat -- 05:09 PM EDT     1.82 knots Max Flood
Sat -- 08:22 PM EDT     Moonrise
Sat -- 08:31 PM EDT     Sunset
Sat -- 09:10 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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-2.9-2.1-0.80.61.41.51.20.90.3-0.6-1.6-2.3-2.4-1.8-0.70.51.51.81.81.61.20.2-1.1-2.3

Weather Map
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wmap_A
GEOS Local Image of    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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (1,6,7,8)
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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.