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 6:31AM||Sunset 8:33PM||Tuesday July 17, 2018 1:41 AM EDT (05:41 UTC)||Moonrise 10:33AM||Moonset 11:15PM||Illumination 18%|
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|AMZ354 Waters From Savannah Ga To Altamaha Sound Ga Out 20 Nm, Including Grays Reef National Marine Sanctuary- 1246 Am Edt Tue Jul 17 2018 |
Tonight..SW winds 10 to 15 kt. Seas 2 ft. A chance of showers and tstms.
Tue..SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms in the morning, then showers and tstms likely in the afternoon.
Tue night..SW winds 10 to 15 kt with gusts to 20 kt. Seas 3 ft. Showers and tstms likely, mainly in the evening.
Wed..SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms in the morning, then showers and tstms likely in the afternoon.
Wed night..W winds 5 to 10 kt. Seas 2 to 3 ft. Showers and tstms likely.
Thu..W winds 5 to 10 kt, becoming S in the afternoon. Seas 2 ft. Showers and tstms likely.
Thu night..SW winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely. Tstms likely, mainly in the evening.
Fri..SW winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely with a chance of tstms.
Fri night..SW winds 10 kt. Seas 3 ft. A chance of showers and tstms.
Sat..SW winds 10 to 15 kt. Seas 3 ft. A chance of showers and tstms.
Sat night..SW winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
|AMZ300 1246 Am Edt Tue Jul 17 2018 |
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. An inland surface trough will strengthen overnight. A cold front will move into the area mid week before stalling and then moving north as a warm front Friday.
7 Day Forecast for Marine Location Near Reidsville, GAHourly EDIT Help
Area Discussion for - Charleston, SC  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus62 kchs 170345|
area forecast discussion
national weather service charleston sc
1145 pm edt Mon jul 16 2018
An inland surface trough will strengthen through tonight. A
cold front will move into the area mid week before stalling and
then moving north as a warm front Friday.
Near term until 6 am Tuesday morning
Latest radar imagery indicates a broad swath of showers rain
extending north northwest from coastal southeast georgia into
southeast south carolina with a few stronger thunderstorms along
the leading edge in the tri-county area. These thunderstorms
will shift north northeast out of the area over the next hour,
while the swath of broad rain showers continues for next couple
hours, especially along coastal locations. Deep layered moisture
characterized by pwats of 2+ inches and sfc dewpts in the mid
70s suggest the main threat with this activity to be brief heavy
rainfall for the next hour or two and possibly some strong wind
gusts over parts of northern charleston and berkeley counties.
The latest forecast indicates numerous showers and thunderstorms over
the next hour or two along the swath of precip described above,
followed by a downward trend to chances of showers and thunderstorms
for most locations through the overnight period as deep-layered
moisture remains in place and a moderately strong h5 shortwave
passes over the region late. Overnight lows will generally start
out cooler due to previous rains, but will level out and
potentially warm a degree or two through tonight. In general,
lows should range in the mid 70s inland to upper 70s near the
Short term 6 am Tuesday morning through Thursday
An amplifying upper level trough over the east coast on Tuesday will
only shift slowly off the coast Wednesday and Thursday. This flow
pattern will maintain very high moisture content air with
precipitable water values from 2.0 to 2.3 inches over the forecast
area at least into Wednesday. Then the models differ some on
maintaining the high precipitable water levels over the area with
the NAM maintaining it through Thursday, the GFS through Wednesday
and the ECMWF and the canadian models only into Wednesday. Most
models now bring the cold front deeper into or perhaps even just
through the forecast area Wednesday into Thursday before stalling it
With the front a bit further south and the possibility of at least
somewhat drier air moving in the north and west possibly Wednesday
and a bit more likely by Thursday, lowered rain chances a bit in the
west Wednesday and a little more substantially Thursday in the north
and west. With the high precipitable water levels and relative slow
storm motions, feel that there is a decent threat for some heavy
rain on Tuesday. By Wednesday and certainly by Thursday, the threat
for heavy rain would be most likely across southeast georgia and
coastal southeast south carolina. Due to cloud cover and relative
quick development of scattered to numerous showers and thunderstorms
each day, think the threat for strong thunderstorms would be quite
low. Highs through the period will be near 90 inland and mid to
upper 80s at the coast. Lows will mainly be in the mid to upper
Long term Thursday night through Monday
A stationary front will hover over the region Thursday night.
The stationary front will transition into a warm front and then move|
northward on Friday. A trough is expected to develop inland over the
weekend while another cold front slowly approaches. The end result
will be a rainy weather pattern.
Aviation 04z Tuesday through Saturday
Showers will continue to impact the sav and chs terminals
to around 04-05z with perhaps some tempo MVFR vsbys.VFR
conditions should then prevail at both chs and sav terminals
into late Tuesday morning. However, flight restrictions could be
possible with any late night shower thunderstorm associated
with a wave of energy passing aloft. The next best chance of
flight restrictions could come at both chs and sav terminals
Tuesday afternoon when another round of showers thunderstorms
develop over the area. At this time, vcts has been included at
chs starting at 17z Tuesday and at sav starting at 18z Tuesday.
Extended aviation outlook: a front will bring unsettled weather in
the form of showers and thunderstorms and periodic restrictions
through the weekend, mainly during the afternoon and evening
Outside of an outflow boundary currently shifting over northern
south carolina waters, variable winds will start off at or
below 5-10 kt while steady rain showers occur. Later tonight,
the low-lvl gradient should strengthen as a h5 shortwave shifts
over the area while sfc high pressure generally prevails over
the western atlantic. Southwest winds of 5-10 kt should
gradually increase to 10-15 kt overnight. Seas will slowly build
A tightening pressure gradient between an approaching cold
front to the west and strong atlantic high pressure should
increase winds Tuesday afternoon and Tuesday night to near 15
knots with some gusts in excess of 20 knots. This will result in
seas building to generally 2 to 4 feet that will persist well
into Wednesday. At the present time, feel winds during this
period will remain below small craft advisory levels. Otherwise,
expect winds to remain below 15 knots with seas mainly from 1
to 3 feet through the period. The front will become stationary
across our area Wednesday and Thursday and then transition into
a warm front and move northward on Friday.
Tides coastal flooding
Astronomical influences and onshore winds will produce elevated
tides again tonight. Minor coastal flooding is possible again,
mainly along the south carolina coast and downtown charleston
Chs watches warnings advisories
Near term... Dpb
short term... Mte
aviation... Dpb mte
marine... Dpb mte
tides coastal flooding...
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|
|SAXG1 - Sapelo Island Reserve, GA||58 mi||42 min||SE 1.9||78°F||1017 hPa (+0.0)||77°F|
|FPKG1 - 8670870 - Fort Pulaski, GA||66 mi||42 min||S 4.1 G 8||78°F||85°F||1017.5 hPa (-0.6)|
|41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA||78 mi||52 min||ESE 1.9 G 3.9||82°F||84°F||2 ft||1017.6 hPa (+0.0)||74°F|
Wind History for Fort Pulaski, GA(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Vidalia, Vidalia Municipal Airport, GA||21 mi||47 min||S 3||7.00 mi||Fair||77°F||71°F||83%||1017.6 hPa|
|Claxton Evans County Airport, GA||23 mi||47 min||N 0||10.00 mi||Fair||76°F||75°F||96%||1017.3 hPa|
Wind History from VDI (wind in knots)
|1 day ago||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||E||Calm||Calm||NE||Calm||SE||Calm||Calm||SE||SW||Calm||S||SW||Calm||Calm||S|
|2 days ago||Calm||E||NE||NE||NE||E||NE||NE||E||NE||E||NE||N||SE||E||E||SE||S||S||Calm||Calm||Calm||Calm||E |
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Highway bridge |
Click for Map
Tue -- 03:22 AM EDT 1.22 feet High Tide
Tue -- 06:30 AM EDT Sunrise
Tue -- 10:52 AM EDT -0.10 feet Low Tide
Tue -- 11:29 AM EDT Moonrise
Tue -- 04:03 PM EDT 1.10 feet High Tide
Tue -- 08:31 PM EDT Sunset
Tue -- 11:15 PM EDT -0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
Click for Map
Tue -- 01:24 AM EDT 9.24 feet High Tide
Tue -- 06:31 AM EDT Sunrise
Tue -- 07:34 AM EDT -0.81 feet Low Tide
Tue -- 11:30 AM EDT Moonrise
Tue -- 02:07 PM EDT 8.39 feet High Tide
Tue -- 07:57 PM EDT -0.35 feet Low Tide
Tue -- 08:30 PM EDT Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  HelpWeather Map
GOES 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 (1,6,7,8)(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.