Saturday, August15, 2020
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Marine Weather and Tides
North Charleston, 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 6:42AMSunset 8:06PM Saturday August 15, 2020 3:53 AM EDT (07:53 UTC) Moonrise 1:55AMMoonset 4:40PM Illumination 13% Phase: Waning Crescent; Moon at 26 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- 320 Am Edt Sat Aug 15 2020
Today..W winds 10 to 15 kt early, becoming sw, then S 15 kt with gusts to 20 kt this afternoon. A chance of showers and tstms.
Tonight..SW winds 10 to 15 kt. A chance of showers and tstms.
Sun..SW winds 10 to 15 kt. A slight chance of showers and tstms in the morning, then a chance of showers and tstms in the afternoon.
Sun night..SW winds 5 to 10 kt, becoming nw after midnight. A chance of showers and tstms.
Mon..N winds 5 to 10 kt, becoming ne in the afternoon. A slight chance of showers and tstms in the morning, then a chance of showers and tstms in the afternoon.
Mon night..E winds 5 to 10 kt, diminishing to 5 kt after midnight. A chance of showers and tstms, mainly in the evening.
Tue..E winds 5 to 10 kt. A chance of showers and tstms.
Tue night..SE winds 5 to 10 kt. A chance of showers and tstms.
Wed..SE winds 5 to 10 kt. Showers and tstms likely.
Wed night..S 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 86 degrees.
AMZ300 320 Am Edt Sat Aug 15 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A trough of low pressure will persist inland today, while high pressure remains over the atlantic. A weak cold front will approach the area tonight and then pass through on Sunday. A trough will redevelop over the region and persist through much of next week.


7 Day Forecast for Marine Location Near North Charleston, SC
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location: 32.85, -80.05     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 150501 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 101 AM EDT Sat Aug 15 2020

SYNOPSIS. A trough of low pressure will persist inland, while high pressure remains over the Atlantic through Saturday. A weak cold front will then pass through the area Sunday into Sunday night. A trough will redevelop over the region during the middle of next week.

NEAR TERM /UNTIL 6 AM THIS MORNING/. Considerable moisture and increasing convergence from off the ocean will result in at least a slight chance of showers and t-storms prior to daybreak, especially across Charleston County. Wet grounds and at least partial clearing will allow for pockets of light fog and low stratus to develop. Temps will again average in the lower or middle 70s most locations, except for some upper 70s close to the shoreline and in downtown Charleston.

SHORT TERM /6 AM THIS MORNING THROUGH MONDAY/. The upper trough that has lingered just west of the area for several days will begin to push east on Saturday, moving offshore by Sunday night. This will push a weak cold front through the area Sunday and Sunday night. Plenty of moisture will remain in place through the weekend which, combined with a series of embedded shortwaves, will produce numerous showers and thunderstorms. PWATs will drop precipitously by Monday behind the front with values below 1.5" in most locations. A weak lee trough will exist on Monday and a sea breeze will develop in the afternoon, so scattered showers and tstms are still expected albeit with lower coverage than over the weekend.

LONG TERM /MONDAY NIGHT THROUGH FRIDAY/. A return to more unsettled weather is expected during the long term period. The forecast area will become positioned between a mid level trough to the west and ridging to the east. This set-up will bring deep moisture and a series of shortwaves back into the area. Meanwhile, another surface trough will take shape over the region by the middle of the week. Higher than normal rain chances are expected, especially Wednesday and Thursday. Temperatures will be near climatology.

AVIATION /06Z SATURDAY THROUGH WEDNESDAY/. There is no more than low end chances for any flight restrictions due to low stratus and/or isolated convection between now and mid morning.

A better chance of SHRA/TSRA with temporary sub-VFR weather will occur between 18Z and 01Z at both KCHS and KSAV. Until tends become more of a certainty, we prefer to include just VCTS and Cb clouds at both sites.

Extended Aviation Outlook: Flight restrictions possible in showers and thunderstorms each day, mainly in the afternoon and evening.

MARINE. Overnight: Expect elevated south/southwest winds due to an enhanced pressure gradient between offshore high pressure and inland low pressure. Winds will will be as high as 10 or 12 kt in Charleston harbor, but up to 15 or even 20 kt at times over the ocean. Seas will be as large as 3 or 4 ft. There will be an increase in both the strength and coverage of convection after 3 or 4 am.

Saturday through Wednesday: The southwest gradient will be slightly enhanced through the weekend as a cold front approaches from the west and Atlantic high pressure persists offshore. A relatively weak pressure pattern will then exist early next week behind the front. The primary marine concern will continue to be the scattered showers and thunderstorms.

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

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 8 mi53 min SSW 6 G 8 80°F 87°F1013 hPa (-1.7)
FBIS1 - Folly Island, SC 14 mi113 min SW 11 G 13 83°F 1013.7 hPa
41029 - Capers Nearshore (CAP 2) 23 mi45 min SSW 18 G 23 84°F 85°F1012.4 hPa
ACXS1 - ACE Basin Reserve, SC 29 mi68 min Calm 78°F 1013 hPa77°F
41033 44 mi45 min SW 16 G 21 84°F 85°F1012.4 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston, Charleston Air Force Base, SC4 mi57 minN 09.00 miA Few Clouds77°F75°F96%1012.6 hPa
Charleston Executive Airport, SC11 mi58 minWSW 310.00 miMostly Cloudy79°F77°F94%1012.9 hPa
Mount Pleasant Regional-Faison Field, SC15 mi58 minN 06.00 miFog/Mist77°F77°F100%1012.5 hPa
Summerville Airport, SC19 mi58 minN 010.00 miPartly Cloudy75°F75°F100%1012.5 hPa
Moncks Corner Berkeley County, SC23 mi58 minN 05.00 miFog/Mist73°F73°F100%1012.5 hPa

Link to 5 minute data for KCHS

Wind History from CHS (wind in knots)
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Last 24hrCalmN3N5N5CalmCalmSW6W53W6W6S6W6SE5S11S10SW8S6CalmN3CalmCalmCalmCalm
1 day agoCalmCalmW4NW4CalmW3NW3SW4S5S4SW8S7S9S9S9N9NW4NW3SW4S5S6E4NE3Calm
2 days agoW4W3CalmW3W5Calm34SE4S6S6S10S12S10S9S8S7SW3S3SE4CalmW7W3SW3

Tide / Current Tables for Drayton, Bee's Ferry, Ashley River, South Carolina
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Drayton
Click for Map
Sat -- 12:13 AM EDT     1.24 feet Low Tide
Sat -- 02:54 AM EDT     Moonrise
Sat -- 06:03 AM EDT     4.96 feet High Tide
Sat -- 06:43 AM EDT     Sunrise
Sat -- 12:16 PM EDT     0.55 feet Low Tide
Sat -- 05:40 PM EDT     Moonset
Sat -- 06:38 PM EDT     6.40 feet High Tide
Sat -- 08:04 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.31.42.23.24.14.754.74321.10.60.81.73.14.55.66.36.45.84.83.62.4

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Sat -- 12:16 AM EDT     0.00 knots Slack
Sat -- 02:15 AM EDT     1.10 knots Max Flood
Sat -- 02:54 AM EDT     Moonrise
Sat -- 05:32 AM EDT     -0.00 knots Slack
Sat -- 06:43 AM EDT     Sunrise
Sat -- 09:06 AM EDT     -1.75 knots Max Ebb
Sat -- 12:05 PM EDT     0.00 knots Slack
Sat -- 02:40 PM EDT     1.60 knots Max Flood
Sat -- 05:39 PM EDT     Moonset
Sat -- 06:29 PM EDT     -0.00 knots Slack
Sat -- 08:03 PM EDT     Sunset
Sat -- 09:52 PM EDT     -2.21 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.20.61.110.60.3-0.3-1-1.5-1.7-1.5-0.9-0.10.81.51.61.30.90.4-0.5-1.3-2-2.2-1.8

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (3,6,7,8)
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Ground Weather Radar Station Charleston, SC
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Disclaimer:
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.