Marine Weather and Tides
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.
|Sunrise 6:54AM||Sunset 6:19PM||Saturday February 24, 2018 5:20 AM EST (10:20 UTC)||Moonrise 12:53PM||Moonset 2:05AM||Illumination 67%|
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|AMZ354 Waters From Savannah Ga To Altamaha Sound Ga Out 20 Nm, Including Grays Reef National Marine Sanctuary- 334 Am Est Sat Feb 24 2018 |
Today..S winds 5 to 10 kt. Seas 3 ft. Patchy fog this morning.
Tonight..S winds 5 to 10 kt. Seas 3 to 4 ft. Patchy fog after midnight.
Sun..S winds 10 to 15 kt. Seas 3 to 4 ft. Patchy fog in the morning. A slight chance of showers in the afternoon.
Sun night..SW winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers, mainly in the evening.
Mon..SW winds 10 kt. Seas 3 ft. A chance of showers with a slight chance of tstms.
Mon night..W winds 5 to 10 kt, becoming N 10 to 15 kt with gusts to 20 kt after midnight. Seas 2 to 3 ft. A chance of showers in the evening.
Tue..NE winds 15 to 20 kt. Seas 3 to 4 ft.
Tue night..NE winds 10 to 15 kt. Seas 3 ft.
Wed..SE winds 10 kt. Seas 3 ft. A chance of showers.
Wed night..S winds 10 to 15 kt. Seas 3 ft. A slight chance of showers. Mariners are reminded that winds and seas higher in and near tstms.
|AMZ300 334 Am Est Sat Feb 24 2018 |
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Unseasonably warm high pressure will prevail into tonight. A cold front will approach the region late Sunday, then move through Monday night. High pressure is then expected until a warm front moves through Wednesday or Wednesday night, followed by another cold front late next week.
7 Day Forecast for Marine Location Near Montgomery, GAHourly EDIT Help
Area Discussion for - Charleston, SC  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus62 kchs 240931|
area forecast discussion
national weather service charleston sc
431 am est Sat feb 24 2018
Unseasonably warm high pressure will prevail into tonight. A
cold front will approach the region late Sunday, then move
through Monday night. High pressure is then expected until a
warm front moves through Wednesday or Wednesday night, followed
by another cold front late next week.
Near term through tonight
Pre-dawn: the low stratus pattern is fairly chaotic early this
morning with satellite depicting most of the stratus currently
occurring over inland southeast sc where some areas west and
north of charleston reporting vsbys 1 2 mile or less. We think
low clouds and fog will expand over inland areas toward dawn
with a dense fog advisory issuance possible over next hour or
so across portions of southeast ga and southern sc.
Today: deep layered ridging will persist, maintaining the
streak of record warmth across the region. Mid level heights are
down from Friday, but since the alignment of the low level
ridge axis is more south and east, we expect a s-sw synoptic
flow rather than a s-se component. Then lends confidence in a
continuation of the very warm afternoon temps, especially since
only scattered clouds are anticipated most areas after morning
low clouds disperse. No changes to our forecast high temp
scheme, a record likely at charleston and perhaps within a
degree or two at savannah.
Tonight: another dry and warm night ahead as substantial
subsidence aloft persists across the area. Potential for fog is
a bit uncertain given somewhat stronger low level southwest
progged in the boundary layer anchored by a slowly tightening
gradient seen at 925 mb. The concerns appear to be tied to late
night advection stratus and fog from south ga and perhaps
stratus and fog adjacent to the beaches and barrier islands.
Given the current uncertainty of how it plays out, we have
patchy fog mentions for far southern zones and along the coast
to the south of charleston. Lows in the upper 50s inland to
lower 60s coast.
Short term Sunday through Tuesday
Sunday: the mid upper levels will consist of strong high pressure
over southern fl and the bahamas, slowly shifting southward.
Southwest winds will prevail over our area. At the surface, atlantic
high pressure will move away while a weak coastal trough hovers
nearby. At the same time, a cold front will slowly approach from the
west. Pwats will rise to ~1.5" late, mainly far inland, which is
approaching 3 standard deviations above normal per naefs. Pops will
increase with the approaching front, reaching their highest numbers
in the evening, then decreasing a bit overnight as the front and
it's energy repositions itself, still just to our west. Measurable
qpf is expected for much of the area, especially far inland. There
is some instability inland, so a slight chance of thunderstorms is
forecasted there in the afternoon. Southerly flow and an
unseasonably warm air mass may lead to record temperatures.
Monday: the mid upper levels will consist of strong high pressure
over southern fl and the bahamas in the morning, shifting into the
southern gulf of mexico overnight. The result will be southwest
winds over our area in the morning, becoming westerly in zonal flow
overnight. At the surface, a cold front will be just to our west
during the day, crossing through in the evening or overnight. Pwats
will be ~1.5" ahead of the front, which is almost 3 standard
deviations above normal per naefs. Pops reflect the expected showers
during the day, diminishing overnight with frontal passage.
Measurable QPF is expected for the entire area. There is some
instability, so a slight chance of thunderstorms are forecasted in
the afternoon. Ahead of the front, temperatures will remain well
Tuesday: the mid upper levels will consist of zonal flow over the
southeast. At the surface, a cold front will be over the coastal
waters in the morning, quickly departing. At the same time, high
pressure will be centered to the north over the mid-atlantic states.
The high will bring dry conditions. Thickness values still support
high temperatures above normal.
Long term Tuesday night through Friday
High pressure to our north will move offshore Tuesday night. A weak
warm front may develop over the area Wednesday, quickly moving north
Wednesday night. A cold front will then approach from the west,
moving through Thursday or Friday.
Aviation 09z Saturday through Wednesday
Both airports wereVFR at 06z with some ground fog noted.
Southerly flow was a tad stronger in the forecast soundings
overnight and this showed up with the somewhat higher fog
stability indices on NAM rap soundings. We maintained good
persistence with the 00z tafs backing off only slightly on
potential MVFR ifr times at ksav. After morning fog disperses
today,VFR will prevail again through this evening.
Extended aviation outlook: flight restrictions are expected
with a slow moving cold front Sunday night into Monday night.
Through tonight, atlantic high pressure will continue offshore
and maintain s-sw flow over sc waters and se-s flow across ga
waters. Speeds will remain less than 15 kt and frequently 10
kt or less over stable and cool shelf waters. The primary
concern will be the potential for patchy to areas of dense sea
fog developing now that the light synoptic flow has become
more southerly. Marine dense fog advisories are possible over
Sunday through Wednesday: a cold front will approach the region late
Sunday, then move through Monday night. The interaction between the
departing front and high pressure building to our north will enhance
the pressure gradient, causing increased winds seas Monday night.
It'll be borderline for small craft advisories for amz350 and 374
during this time period. Conditions will improve during the day
Tuesday as the gradient lowers and high pressure passes to our
north. A warm front will move northward through the region Wednesday
or Wednesday night.
Record highs for february 24:
kchs: 81 2017
ksav: 86 2012
record high minimums for february 25:
kchs: 62 1992
ksav: 63 1992
kcxm: 61 2017
record highs for february 25:
kchs: 81 2017
ksav: 82 1985
kcxm: 80 1930
Chs watches warnings advisories
short term... Ms
long term... Ms
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|
|FPKG1 - 8670870 - Fort Pulaski, GA||19 mi||50 min||SSE 1.9 G 4.1||64°F||62°F||1024.3 hPa|
|SAXG1 - Sapelo Island Reserve, GA||30 mi||80 min||SSE 4.1||65°F||1024 hPa (-2.0)||65°F|
|41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA||34 mi||90 min||SE 5.8 G 5.8||62°F||59°F||4 ft||1024 hPa (-1.6)||62°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
|Hunter U. S. Army Airfield, GA||13 mi||24 min||N 0||7.00 mi||Fair||62°F||60°F||93%||1023.6 hPa|
|Savannah-Hilton Head International Airport, GA||21 mi||27 min||N 0||0.50 mi||Fog||61°F||61°F||100%||1024.2 hPa|
|Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA||22 mi||24 min||N 0||0.25 mi||Fog||58°F||58°F||100%||1024 hPa|
Wind History from SVN (wind in knots)
|1 day ago||Calm||Calm||Calm||SE||SE||SW||SW||SE||SE||S||SE||S||SE||E||E||E||E||Calm||Calm||Calm||Calm||Calm||Calm||Calm|
|2 days ago||Calm||Calm||Calm||SE||S||S||S|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Florida Passage |
Click for Map
Sat -- 02:05 AM EST Moonset
Sat -- 02:48 AM EST 7.48 feet High Tide
Sat -- 06:57 AM EST Sunrise
Sat -- 09:42 AM EST 0.46 feet Low Tide
Sat -- 12:53 PM EST Moonrise
Sat -- 03:21 PM EST 6.52 feet High Tide
Sat -- 06:18 PM EST Sunset
Sat -- 10:03 PM EST -0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Savannah River Entrance |
Click for Map
Sat -- 12:02 AM EST 2.09 knots Max Flood
Sat -- 02:04 AM EST Moonset
Sat -- 03:52 AM EST -0.00 knots Slack
Sat -- 06:53 AM EST -1.75 knots Max Ebb
Sat -- 06:56 AM EST Sunrise
Sat -- 10:16 AM EST 0.00 knots Slack
Sat -- 12:37 PM EST 1.47 knots Max Flood
Sat -- 12:52 PM EST Moonrise
Sat -- 04:16 PM EST -0.00 knots Slack
Sat -- 06:17 PM EST Sunset
Sat -- 07:21 PM EST -1.61 knots Max Ebb
Sat -- 10:20 PM EST 0.00 knots Slack
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 (5,6,7,8)(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.