Marine Weather and Tides
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.
|Sunrise 7:11AM||Sunset 7:37PM||Monday March 27, 2017 12:30 PM EDT (16:30 UTC)||Moonrise 6:03AM||Moonset 6:19PM||Illumination 0%|
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|AMZ330 Charleston Harbor- 1031 Am Edt Mon Mar 27 2017 |
This afternoon..S winds 5 kt...increasing to 10 kt.
Tonight..S winds 5 to 10 kt.
Tue..SW winds 5 to 10 kt...increasing to 15 kt in the afternoon. A slight chance of showers and tstms.
Tue night..SW winds 5 to 10 kt. A slight chance of showers and tstms in the evening.
Wed..W winds 5 kt.
Wed night..S winds 5 kt...becoming E after midnight.
Thu..E winds 5 to 10 kt. A slight chance of showers.
Thu night..SE winds 10 kt. A chance of showers and tstms.
Fri..S winds 10 to 15 kt. A chance of showers and tstms.
Fri night..SW winds 10 to 15 kt. A chance of showers with a slight chance of tstms. Mariners are reminded that winds and waves can be higher in and near tstms. Unless otherwise noted...waves 1 foot or less. Charleston harbor water temperature...62 degrees.
|AMZ300 1031 Am Edt Mon Mar 27 2017 |
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure will weaken early this week. A weak cold front will stall over or near the area during the middle of the week, then shift back north as a warm front Thursday night into Friday. Another cold front will move through Friday night into Saturday followed by drier high pressure Sunday.
7 Day Forecast for Marine Location Near Awendaw, SCHourly EDIT Help
Area Discussion for - Charleston, SC  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus62 kchs 271442|
area forecast discussion
national weather service charleston sc
1042 am edt Mon mar 27 2017
Atlantic high pressure will weaken early this week. A
weak cold front will stall over or near the area during the middle
of the week, then shift back north as a warm front Thursday night
into Friday. Another cold front will move through Friday night into
Saturday followed by drier high pressure Sunday.
Near term /until 6 pm this evening/
The region will remain along the western fringes of atlantic
high pressure today. The day is already off to a warm start and
temperatures are on target to top out into the lower 80s away
from the beaches. Thick altostratus moving across parts of
jenkins, screven and allendale counties extending south to near
springfield and statesboro will gradually thin with time, but
an extensive cumulus field should develop away from the beaches
as the day progresses. As is typical with robust sea breeze
days, expect the cumulus to clear with the passing of the
resultant sea breeze, especially along the lower south carolina
coast. The subsidence inversion noted on the 27/12z chs raob
looks to hold for much of the day per latest rap soundings, but
similar to yesterday, the sea breeze may provide just enough
low-level convergence to cover come it. If the cap is overcome,
as much as 1500 j/kg of SBCAPE could be realized. Expect
isolated convection to fire along/ahead of the sea breeze for a
few hours this afternoon and 20% pops roughly along/west of i-95
look on track.
Short term /6 pm this evening through Thursday/
Tonight: after sunset, a llvl inversion should develop fairly
rapidly, ending free convection. Rounds of debris clouds and
decouple winds should yield a complicated temperature
distribution this evening. However, I will forecast low
temperatures to generally range between the upper 50s to around
60. By the pre dawn period, a mid level s/w should ripple over
the savannah river valley, yielding weak forcing across the
region. Given agreement between the near term guidance, I will
indicate schc pops across most of the CWA for showers.
Tuesday through Thursday: atlantic high pressure will give way
to a cold front Wednesday into Thursday. The front should make
it into southeast ga as high pressure builds from the north
Thursday. Minimal synoptic forcing and instability should yield
low rain chances Tuesday, mainly across sc closer to a passing
shortwave. No significant rainfall is expected. Then mainly dry
Thursday, although cannot rule out a few showers and/or storms
across southeast ga closer to the front. A much better chance
for showers and storms will come Thursday, mainly south of
charleston, as deeper moisture and more synoptic forcing occur
ahead of a storm system over the midwest.
Temperatures should push into the lower to mid 80s inland each
afternoon through Wednesday, likely warmest across interior
southeast ga. Wouldn't be surprised if upper 80s occurred Wednesday,
mainly interior ga, due to compressional heating with the front and
offshore winds. Record highs should be safe but are not out of the
question tue/wed, mainly at kchs. On Thursday, high pressure
building from the north will keep it a bit cooler, especially across
sc where it should stay below 80 degrees except close to the
savannah river. Once again wouldn't be surprised if upper 80s
occurred Thursday toward the altamaha river where some
compressional heating is likely due to the stalled front.
Onshore winds will keep beach areas cooler during the daytime.
Long term /Thursday night through Sunday/
The stalled front across ga is expected to shift north as a warm
front Thursday night into Friday followed by a cold frontal passage
Saturday. Drier high pressure looks to then return later in the
weekend before more unsettled weather possibly moves back into the
area for next Monday. Showers and thunderstorms will be possible|
through Friday night, although the best chances and heaviest amounts
are likely through Friday morning. Temperatures should remain above
normal through the period.
Aviation /15z Monday through Friday/
Sfc ridge will remain offshore through the 12z period. Winds
will remain light to calm during the first one hour of the taf.
Once mixing develops, winds should remain from the S to ssw
through the rest of the morning. Temperatures over land will
become quite warm, supporting a sea breeze to develop between
18z to 20z. As the sea breeze pushes inland, winds should shift
from the south and will increase to around 10 kts. After sunset,
winds should decouple and remain from the south, speeds less
than 5 kts with sct mid clouds.
Extended aviation outlook: brief restrictions possible in any
showers/thunderstorms, mainly thu/fri. Low probability of
restrictions due to early morning low clouds and/or fog, mainly
Today and tonight: interesting setup for wave heights and wave
period off the southeast coast of the u.S. An area of deep low
pressure remains north of the dominican republic today. A weak
sfc ridge between the coast and the low will weaken through the
day. The sfc pattern will yield winds well below small craft
advisory criteria. Wave guidance indicates that swells sourced
from low pressure will reach the area waters. Wave periods may
range between 10 seconds today, increasing to 11 seconds
tonight. Wave heights within 20 nm should favor 3 to 4 feet
through tonight. Wave heights across amz374 will generally favor
5 feet today and tonight.
Tuesday through Saturday: atlantic high pressure will be in control
until a weakening cold front moves into the area Wednesday and
stalls. High pressure will build to the north Thursday but the front
across ga will transition into a warm front Thursday night/Friday
and move back north through the area. A cold front should then move
through early Saturday. At some point prior to the cold frontal
passage Saturday sea fog could develop across the cooler near shore
waters and lead to low visibilities.
Seas could reach 6 feet near the gulf stream through Tuesday night
due to swells from low pressure well offshore and thus an advisory
will be possible across the outer ga waters. Better chance for
advisories will be Thursday night through Friday night as
strengthening southerly winds build seas to 6-7 feet, mainly in the
offshore ga waters north into the sc waters.
Rip currents: a moderate risk of rip currents is in the forecast
along all beaches today given near 10 second period swells of 2-3
feet from the southeast. In addition, the moon is approaching a new
The combination of higher than normal tides, onshore
winds and swells in the surf zone will support an enhanced risk for
rip currents through mid week, possibly lasting into Friday.
High tides could reach advisory levels, mainly late
Wednesday/Thursday, due to strengthening onshore winds and
swells impacting the coast. This could cause shallow saltwater
inundation in typically vulnerable coastal areas, especially in
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|
|41029 - Capers Nearshore (CAP 2)||10 mi||83 min||S 3.9 G 5.8||65°F||1021.5 hPa|
|CHTS1||17 mi||43 min||S 7 G 9.9||71°F||62°F||1021.4 hPa|
|FBIS1 - Folly Island, SC||21 mi||31 min||S 2.9 G 4.1||68°F||1022 hPa (+0.5)||62°F|
|NIWS1 - North Inlet-Winyah Bay Reserve, SC||38 mi||106 min||SSE 5.1||70°F||1021 hPa||59°F|
|41004 - EDISTO - 41 NM Southeast of Charleston, SC||43 mi||41 min||WNW 5.8 G 7.8||70°F||73°F||4 ft||1021.3 hPa (+0.7)||59°F|
|ACXS1 - ACE Basin Reserve, SC||49 mi||106 min||S 1.9||73°F||1021 hPa||61°F|
Wind History for Charleston, SC(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Mount Pleasant Regional-Faison Field, SC||6 mi||36 min||S 7||10.00 mi||Partly Cloudy||75°F||59°F||57%||1021.3 hPa|
|Charleston, Charleston Air Force Base, SC||19 mi||95 min||SW 10 G 15||10.00 mi||A Few Clouds||76°F||57°F||52%||1021.2 hPa|
|Charleston Executive Airport, SC||24 mi||36 min||SSE 9||10.00 mi||A Few Clouds||75°F||59°F||57%||1021.3 hPa|
Wind History from LRO (wind in knots)
|1 day ago||SE||SE||SE||SE||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||SE||Calm||SE||Calm||Calm||Calm||Calm||Calm||Calm||SE||SE||S|
|2 days ago||E|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Moores Landing |
Click for Map
Mon -- 02:12 AM EDT -0.41 feet Low Tide
Mon -- 07:02 AM EDT Moonrise
Mon -- 07:12 AM EDT Sunrise
Mon -- 08:27 AM EDT 5.59 feet High Tide
Mon -- 02:36 PM EDT -0.51 feet Low Tide
Mon -- 07:18 PM EDT Moonset
Mon -- 07:35 PM EDT Sunset
Mon -- 08:44 PM EDT 5.82 feet High Tide
Mon -- 10:59 PM EDT New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Charleston Harbor Entrance |
Click for Map
Mon -- 02:37 AM EDT 0.00 knots Slack
Mon -- 05:07 AM EDT 1.98 knots Max Flood
Mon -- 07:03 AM EDT Moonrise
Mon -- 07:13 AM EDT Sunrise
Mon -- 08:52 AM EDT -0.01 knots Slack
Mon -- 12:02 PM EDT -2.90 knots Max Ebb
Mon -- 02:59 PM EDT 0.00 knots Slack
Mon -- 05:28 PM EDT 2.13 knots Max Flood
Mon -- 07:19 PM EDT Moonset
Mon -- 07:36 PM EDT Sunset
Mon -- 09:09 PM EDT -0.01 knots Slack
Mon -- 10:59 PM EDT New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of Southeast EDIT
Wind Forecast for Charleston, SC (12,3,4,5)(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.