Tuesday, July27, 2021
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Marine Weather and Tides
Summerville, 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 6:29AMSunset 8:24PM Tuesday July 27, 2021 1:55 AM EDT (05:55 UTC) Moonrise 10:07PMMoonset 9:04AM Illumination 91% Phase: Waning Gibbous; Moon at 18 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- 1236 Am Edt Tue Jul 27 2021
Rest of tonight..S winds 10 to 15 kt with gusts to 20 kt. A chance of showers with a slight chance of 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 in the evening.
Thu..W winds 5 to 10 kt, becoming S 10 to 15 kt with gusts to 20 kt in the afternoon.
Thu night..SW winds 10 to 15 kt with gusts to 20 kt.
Fri..SW winds 15 kt.
Fri night..SW winds 10 to 15 kt.
Sat..SW winds 10 to 15 kt. A chance of showers and tstms.
Sat night..SW winds 10 to 15 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 85 degrees.
AMZ300 1236 Am Edt Tue Jul 27 2021
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Weak low pressure will drift north along the southeast georgia and south carolina coast tonight and Tuesday. A trough will then bring unsettled weather through midweek. A weak front could drop into the region late week and stall over the weekend.


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 270535 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 135 AM EDT Tue Jul 27 2021

SYNOPSIS. Weak low pressure will drift north along the southeast Georgia and South Carolina coast tonight and Tuesday. A trough will then bring unsettled weather through midweek. A weak front could drop into the region late week and stall over the weekend.

NEAR TERM /UNTIL 6 AM THIS MORNING/. The surface low looks to be near Jesup, Georgia, with an associated inverted trough from that feature northeast into South Carolina. the low will lift toward Savannah as the trough meanders in place. Given an abundance of moisture and MLCAPE of 1500-2000 J/kg, we anticipate scattered showers and isolated thunderstorms to spread north across the eastern third of the forecast region. this is where we find the best moisture convergence aligned with the best lapse rates and some upper difluence.

Given the south and southeast synoptic flow and elevated dew points, it'll be much warmer and very humid overnight. Lows will only reach the mid to upper 70s, and around 80F in Downtown Charleston/immediate coastline.

SHORT TERM /6 AM THIS MORNING THROUGH THURSDAY/. A surface trough of low pressure will linger over the region through midweek. Aloft, a broad trough will persist over the Northeast with a large ridge over the Central U.S. Models indicate PWats will surge to near or over 2.25 inches Tuesday into Wednesday, before gradually decreasing Wednesday evening. These values are well above late July climatology. With aid from weak shortwave energy, scattered to numerous showers and thunderstorms are expected to develop. Coverage will peak in the afternoons when instability is greatest, but activity will be possible just about any time including overnight.

Given the deep moisture and fairly weak storm motions, there will be a threat for locally heavy rainfall which is backed up by some probabilistic guidance including the HREF. Slow moving storms could lead to minor flooding in low-lying and poor drainage areas. The severe threat looks to be low overall, but a couple stronger to possibly severe storms can't be ruled out, with the main hazard being isolated damaging wind gusts.

Moisture levels will be much lower on Thursday and with lack of large scale forcing, shower/thunderstorm coverage is expected to be less than previous days. Perhaps the more interesting forecast note of the day will be the temperatures. Highs are expected to average in the low to mid 90s, highest inland, with heat indices around 105.

LONG TERM /THURSDAY NIGHT THROUGH MONDAY/. Surface troughing will linger inland on Friday before a weak front drops into the region and possibly stalls in the vicinity over the weekend. Mainly diurnally driven showers and thunderstorms are possible each day. Hot temperatures and higher relative humidity values could lead to heat indices of 105-110. Given our heat advisory criteria of 110, we will need to monitor the potential for Heat Advisories, especially on Friday.

AVIATION /06Z TUESDAY THROUGH SATURDAY/. An unsettled pattern will prevail with the 06Z TAFs, courtesy of overly abundant moisture, sufficient instability and lift generated from weak low pressure over southeast Georgia, an associated trough and various meso-scale boundaries.

The first part of the day there is a good chance that MVFR and possibly IFR ceilings could impact KSAV, due to the proximity of that terminal to the surface low.

Otherwise, scattered SHRA and isolated TSRA pre-dawn will increase in coverage during the daytime hours on Tuesday, leading to occasional SHRA/TSRA impacting not only KSAV, but also KCHS and KJZI. Temporary flight restrictions and gusty winds will result, with the best chances currently looking to occur during the late morning through the mid to late afternoon.

There will be a lull in convection during the late afternoon and evening, but with the approach of a short wave Tuesday night, additional convection can occur, especially at KCHS and KJZI.

Extended Aviation Outlook: Flight restrictions are possible in showers and thunderstorms through Wednesday.

MARINE. Overnight: Weak surface low pressure will lift north across southeast Georgia. The marine community will be situated on the western periphery of the sub-tropical ridge, producing south to southeast winds of 15 or 20 kt. Some of the widely scattered thunderstorms however will produce wind gusts of 25 or 30 kt. Seas will average 3-4 ft.

Waterspouts: The SPC Non-supercell Tornado Parameter and the local Waterspout Index indicate that waterspouts could occur through at least Tuesday morning.

Tuesday through Saturday: Generally south to southwest winds expected through late week. Winds are expected to remain below Small Craft Advisory criteria, although speeds on Friday could be in the 15-20 knot range as the pressure gradient tightens. Seas will average 2-4 feet.

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



NEAR TERM . SHORT TERM . ETM LONG TERM . ETM AVIATION . MARINE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 25 mi55 min S 13 G 15 82°F 1015.8 hPa (-0.6)
ACXS1 - ACE Basin Reserve, SC 31 mi70 min SE 1.9 82°F 1016 hPa79°F
41065 33 mi67 min 82°F3 ft
41033 48 mi47 min S 9.7 G 18 83°F 82°F1014.2 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Summerville Airport, SC8 mi60 minVar 310.00 miFair79°F79°F100%1014.9 hPa
Charleston, Charleston Air Force Base, SC10 mi59 minS 610.00 miPartly Cloudy80°F77°F90%1015.1 hPa
Moncks Corner Berkeley County, SC18 mi60 minN 010.00 miFair77°F77°F100%1015.2 hPa
Charleston Executive Airport, SC21 mi60 minS 710.00 miA Few Clouds81°F77°F89%1015.2 hPa
Mount Pleasant Regional-Faison Field, SC23 mi60 minN 09.00 miMostly Cloudy82°F81°F94%1015.2 hPa
Walterboro Lowcountry Regional Airport, SC24 mi60 minSE 410.00 miFair77°F77°F100%1015.2 hPa

Link to 5 minute data for KDYB

Wind History from DYB (wind in knots)
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Last 24hr------CalmCalmCalmN3Calm343Calm4
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446CalmCalmCalmCalmCalmCalmCalm4
1 day ago--Calm------Calm------------------------------------
2 days agoCalmCalmCalm--Calm--CalmCalm453--4NE63E7543--Calm--CalmCalm

Tide / Current Tables for Bacon Bridge, Ashley River, South Carolina
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Bacon Bridge
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Tue -- 01:41 AM EDT     2.28 feet High Tide
Tue -- 06:31 AM EDT     Sunrise
Tue -- 08:50 AM EDT     -0.02 feet Low Tide
Tue -- 10:03 AM EDT     Moonset
Tue -- 02:01 PM EDT     1.95 feet High Tide
Tue -- 08:23 PM EDT     Sunset
Tue -- 09:00 PM EDT     0.09 feet Low Tide
Tue -- 11:07 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.82.22.32.11.81.30.80.40.1-00.30.81.41.821.91.61.30.90.50.20.10.30.8

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
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Tue -- 02:40 AM EDT     -2.71 knots Max Ebb
Tue -- 05:49 AM EDT     0.00 knots Slack
Tue -- 06:30 AM EDT     Sunrise
Tue -- 08:01 AM EDT     1.53 knots Max Flood
Tue -- 10:02 AM EDT     Moonset
Tue -- 11:47 AM EDT     -0.00 knots Slack
Tue -- 02:58 PM EDT     -2.21 knots Max Ebb
Tue -- 06:04 PM EDT     0.00 knots Slack
Tue -- 08:21 PM EDT     Sunset
Tue -- 08:26 PM EDT     1.48 knots Max Flood
Tue -- 11:05 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.5-1.7-2.5-2.7-2-10.21.21.51.41.20.7-0.2-1.2-1.9-2.2-1.8-1-0.10.91.41.41.31

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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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