Marine Weather and Tides
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
|Sunrise 6:14AM||Sunset 8:18PM||Tuesday May 22, 2018 3:20 PM EDT (19:20 UTC)||Moonrise 12:38PM||Moonset 1:14AM||Illumination 54%|
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|AMZ330 Charleston Harbor- 1143 Am Edt Tue May 22 2018 |
This afternoon..S winds 5 to 10 kt. A slight chance of showers and tstms.
Tonight..S winds 5 to 10 kt. A slight chance of tstms. A chance of showers, mainly in the evening.
Wed..S winds 5 to 10 kt. A chance of showers. A slight chance of tstms in the morning, then a chance of tstms in the afternoon.
Wed night..SW winds 5 to 10 kt. A slight chance of showers and tstms.
Thu..SW winds 5 kt, becoming se in the afternoon. A chance of showers and tstms.
Thu night..SE winds 5 to 10 kt. A chance of showers. A chance of tstms, mainly in the evening.
Fri..SE winds 5 to 10 kt. A chance of showers and tstms.
Fri night..S winds 5 to 10 kt. A slight chance of showers and tstms.
Sat..SE winds 5 to 10 kt. A chance of showers and tstms.
Sat night..S winds 5 to 10 kt. A chance of showers with a slight chance of 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 78 degrees.
|AMZ300 1143 Am Edt Tue May 22 2018 |
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. The region will remain in a warm and muggy air mass between atlantic high pressure to the east and low pressure to the west into early next week.
7 Day Forecast for Marine Location Near North Charleston, SCHourly EDIT Help
Area Discussion for - Charleston, SC  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus62 kchs 221548|
area forecast discussion
national weather service charleston sc
1148 am edt Tue may 22 2018
The region will remain in a warm and muggy air mass between
atlantic high pressure to the east and low pressure to the west
into early next week.
Near term until 6 pm this evening
The convective pattern is evolving as expected with the greatest
concentration of showers tstms occurring over southeast georgia
into far southern south carolina. Near term pops were adjusted
upwards to 80-90% along the georgia coast, including the
savannah metro area, for the next few hours based on short term
radar and model trends. Pops were also lowered slightly for the
charleston metro area as the sea breeze is already moving
inland west the highway 17 corridor, which should help diminish
the risk for measurable rainfall. Minor adjustments were made to
hourly temperatures per latest observations. There should be
enough Sun and breaks between the convective clusters for
temperatures to make the current high temperature forecast so no
changes were made there at this time.
A fairly active, wet day is expected for much of the day as the
region will remain pinned between broad mid-level troughiness
extending across the deep south into florida and subtropical
high pressure centered well offshore. Moisture being advected
northward out of the western caribbean will remain in place
today with pwats surging as high as 1.90 inches at times.
Forecast and observed soundings show fairly low convective
temperatures so with deep, tropical moisture in place aided
by some weak difluence aloft associated with an h25 shear axis,
expect scattered to numerous showers and some tstms to impact
much of southeast south carolina and southeast georgia through
sunset. It appears that the deepest band of moisture will setup
across southeast georgia so this should be where the greatest
rain coverage should occur, especially the afternoon sea breeze
begins its inland trek. Subtropical ridging looks to hold the
strongest over the charleston metro area up into eastern
berkeley and upper charleston counties so rain chances will be
considerably less there, which matches the latest trends noted
in the various cams. Locally heavy rainfall along with minor
flooding of low lying and poor drainage areas will be the
primary hazards today.
For the morning update, will increase pops to 70% across much
of interior southeast georgia and expand likely pops up to 60%
eastward into the walterboro and beaufort areas. Pops will then
drop off quickly into the 20-30% range over eastern berkeley and
upper charleston counties. Also lowered highs 1-2 degs across
southeast georgia where extensive cloud cover and shower
activity should limit temperatures.
Short term 6 pm this evening through Friday
Tonight: diurnal showers and isolated thunderstorms are forecast to
gradually dissipate through the evening and overnight hours. I will
forecast schc pops for most areas, slightly greater over the marine
areas. Using a blend of mos, I will forecast low temps from low 70s|
across the beaches to the upper 60s inland.
Wednesday through Friday: the area will remain between atlantic
high pressure to the east and low pressure to the west. A cold
front will approach from the north Wednesday night before
stalling out just north of the area. This pattern will maintain
the tropical air mass in place and lead to higher than normal
rain chances, especially each afternoon and evening. In general
we think the highest chances will be inland near the better
moisture, instability and forcing. Some spots could pick up over
an inch through the period. No significant flooding or severe
weather is anticipated at this time. Temperatures will generally
be near to above normal, especially lows.
Long term Friday night through Monday
Not much pattern change late this week into early next week with
high pressure remaining to the east and and low pressure to the
west. Will be watching for potential tropical cyclone development in
the south-central gulf of mexico. Models have been fairly agreeable
lately that the low will track toward the north-central gulf coast
region this weekend. This pattern will continue to maintain a
tropical air mass across southeast sc ga and lead to higher than
normal rain chances. Temperatures should stay near to above
Aviation 16z Tuesday through Saturday
Kchs:VFR. Showers tstms should remain west of the terminal.
Ksav: showers tstms should be at around the terminal at the
beginning of the 18z TAF period. Activity should move quickly
west and northwest of the terminal by 19-20z. Otherwise,VFR.
Extended aviation outlook: a persistent tropical air mass will lead
to higher than normal rain chances through the weekend, mainly each
afternoon. Thunder chances will be low however given the limited
instability. Some restrictions will also be possible from morning
low clouds and or fog as well.
Large high pressure centered over bermuda will remain over the
region through tonight. Southeast winds will continue through today
and tonight, speeds remaining between 10-13 kts. Wave heights are
forecast to range from 2-3 ft within 20 nm to 4-5 ft beyond 20 nm.
Wednesday through Sunday: the area will remain between low pressure
to the west and high pressure to the east. A tropical cyclone may
develop in the central gulf of mexico later this week but models are
in good agreement it will remain far enough away to not have really
significant impacts locally. However, do expect an increase in winds
and seas later this week and we could see advisory conditions this
Chs watches warnings advisories
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|CHTS1||8 mi||50 min||S 8.9 G 14||80°F||78°F||1020.4 hPa|
|FBIS1 - Folly Island, SC||14 mi||80 min||S 9.9 G 11||77°F||1021.4 hPa (-0.6)||71°F|
|41029 - Capers Nearshore (CAP 2)||23 mi||72 min||S 7.8 G 12||78°F||78°F||1021.4 hPa|
|ACXS1 - ACE Basin Reserve, SC||29 mi||95 min||SSE 1.9||78°F||1021 hPa||72°F|
|41033||44 mi||72 min||SSW 9.7 G 14||76°F||78°F||1020.2 hPa|
Wind History for Charleston, SC(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Charleston, Charleston Air Force Base, SC||4 mi||84 min||NNW 9||10.00 mi||Light Rain||77°F||71°F||82%||1020.4 hPa|
|Charleston Executive Airport, SC||11 mi||65 min||S 11||8.00 mi||Overcast||82°F||71°F||70%||1020.3 hPa|
|Mount Pleasant Regional-Faison Field, SC||15 mi||65 min||S 10 G 14||9.00 mi||Fair||81°F||71°F||74%||1020.3 hPa|
|Summerville Airport, SC||19 mi||45 min||S 3||10.00 mi||Overcast||77°F||71°F||83%||1020.7 hPa|
|Moncks Corner Berkeley County, SC||23 mi||65 min||SSW 6||7.00 mi||Light Rain||72°F||69°F||94%||1020.7 hPa|
Wind History from CHS (wind in knots)
|1 day ago||S||S||SW||SW||SW||W||Calm||S||SW||Calm||S||S||S||N||Calm||Calm||N||Calm||Calm||S||SE||S||SE||SE|
|2 days ago||SE||S||SE||SE||SE||S||S||S||S||S||SW||S||S||S||SE||SE||S||S||S||S||S||S||SE |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
Click for Map
Tue -- 02:13 AM EDT Moonset
Tue -- 03:07 AM EDT 6.28 feet High Tide
Tue -- 06:16 AM EDT Sunrise
Tue -- 09:33 AM EDT -0.06 feet Low Tide
Tue -- 01:38 PM EDT Moonrise
Tue -- 03:55 PM EDT 5.73 feet High Tide
Tue -- 08:17 PM EDT Sunset
Tue -- 09:54 PM EDT 0.17 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Charleston Harbor Entrance |
Click for Map
Tue -- 02:12 AM EDT Moonset
Tue -- 03:03 AM EDT -0.00 knots Slack
Tue -- 06:16 AM EDT Sunrise
Tue -- 06:20 AM EDT -2.45 knots Max Ebb
Tue -- 09:34 AM EDT 0.00 knots Slack
Tue -- 11:49 AM EDT 1.44 knots Max Flood
Tue -- 01:37 PM EDT Moonrise
Tue -- 03:41 PM EDT -0.00 knots Slack
Tue -- 06:51 PM EDT -2.23 knots Max Ebb
Tue -- 08:16 PM EDT Sunset
Tue -- 09:56 PM EDT 0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  HelpWeather Map
GOES 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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Wind Forecast for Charleston, SC (15,3,4,5)(on/off)  Help
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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 numerious 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.