Wednesday, March29, 2017 L-36.com


Marine Weather and Tides
Sullivan's Island, SC

Version 3.4
What's New / NOTES
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 7:08AMSunset 7:39PM Wednesday March 29, 2017 7:02 AM EDT (11:02 UTC) Moonrise 7:24AMMoonset 8:33PM Illumination 4% Phase: Waxing Crescent; Moon at 2 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
    EDIT      (on/off)   Help
AMZ330 Charleston Harbor- 327 Am Edt Wed Mar 29 2017
Today..W winds 5 kt...becoming ne 10 kt early this afternoon...then becoming E 10 to 15 kt late.
Tonight..E winds 10 kt.
Thu..E winds 5 to 10 kt. A slight chance of showers.
Thu night..SE winds 10 kt. A slight chance of tstms. A chance of showers.
Fri..S winds 15 kt. Showers with a chance of tstms.
Fri night..SW winds 15 kt...becoming W 5 to 10 kt after midnight. A chance of showers and tstms in the evening.
Sat..W winds 5 kt.
Sat night..W winds around 5 kt.
Sun..E winds around 5 kt.
Sun night..SE winds 5 kt. 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...64 degrees.
AMZ300 327 Am Edt Wed Mar 29 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A weak front will sag south over the area today...then move north as a warm front Thursday night. A cold front will move through Friday night followed by dry high pressure into Sunday. Unsettled weather should return again next Monday, possibly lasting into Tuesday.

7 Day Forecast for Marine Location Near Sullivan's Island, SC
   Hourly   EDIT   Help
location: 32.77, -79.91     debug


Area Discussion for - Charleston, SC
      (on/off)   Help   NOTE: mouseover dotted underlined text for definition
Fxus62 kchs 290813
afdchs
area forecast discussion
national weather service charleston sc
413 am edt Wed mar 29 2017

Synopsis
A weak front will sag south over the area today, then move north as
a warm front Thursday night. A cold front will move through Friday
night followed by dry high pressure into Sunday. Unsettled weather
should return again next Monday, possibly lasting into Tuesday.

Near term /through tonight/
Pre-dawn: tranquil conditions will persist with mainly clear
skies and light/variable winds. There could be some patchy
ground fog in spots were some of the showers fell yesterday
in southeast sc, no significant vsby reductions are anticipated.

Today: mid and upper level ridging will build across the ga and
the carolinas, maintaining above average temperatures and
generally dry weather. Surface high pressure building to the
northwest and north, will push a weak cold front into the
forecast area. There is not much of a thermal gradient with the
front and it's main impact will be subtle wind shifts this
morning over south carolina. High temps will once again be in
the mid 80s many areas today, the beaches and barrier islands
should remain quite a bit cooler with onshore afternoon flow. We
have a slight chance of brief showers with the sea breeze
closer to the altamaha river later this afternoon but too much
subsidence aloft to support any deeper convection.

Tonight: a bit of tricky forecast with a light onshore and
upslope flow. This synoptic pattern along with elevated surface
dew points favor some stratus development overnight and this
was supported by several 00z model solutions. With low level
winds picking up a bit late, it looks a bit doubtful we will see
significant fog from build-down stratus, but there was enough
evidence to introduce some patchy fog around the savannah river
entrance south into coastal ga. Lows will be in the upper 50s
north to lower 60s south.

Short term /Thursday through Saturday/
A stalled front across southeast ga Thursday will shift north as a
warm front Thursday night followed by a cold front Friday night.

Rain chances will ramp up toward Thursday afternoon when deeper
moisture and isentropic ascent increase across the area. Thus,
showers and possibly a few thunderstorms (mainly across ga) are
expected Thursday afternoon/evening with a lull likely, especially
across ga, before increasing again toward daybreak Friday as
stronger synoptic forcing arrives. Precipitation should taper off
later Friday as the deepest moisture shifts northeast of the area.

Although wind fields will be strong Friday, instability appears
minimal and thus the threat for severe weather is low at this time.

Either way it should be a breezy day with gusts up to around 25-30
mph. Any lingering showers near the sc coast should end Friday
evening as a cold front moves through with dry conditions the rest
of the night into Saturday.

On Thursday temperatures will be a bit cooler than Wednesday behind
the front, especially across sc where it should stay below 80
degrees except close to the savannah river. Temperatures Friday will
be moderated by the clouds/rain, likely only reaching close to 80
inland with a slight warmup Saturday as slight cool advection likely
gets overcome by some downslope warming.

Long term /Saturday night through Tuesday/
Dry high pressure to prevail through Sunday night although moisture
will be increasing toward Monday morning as low-level jetting ramps
up ahead of approaching low pressure from the west. Unsettled
weather is expected Monday into Tuesday although timing is a bit
uncertain at this point. Mid-level ridging should keep things dry
and quite warm Wednesday, possibly near record levels in ga.

Otherwise, temperatures should remain above normal through the
period.

Aviation /08z Wednesday through Sunday/
Vfr at ksav and kchs through 06z Thursday. Small chances for
lower CIGS developing/advecting off the atlantic later tonight.

Extended aviation outlook: restrictions likely due to
showers/thunderstorms/low clouds, mainly Thu night into fri. Breezy
conditions expected fri.

Marine
Today: a weak cold front will drift into the waters today and
lose definition late as it mingles with the sea breeze
oscillations. Winds will gradually veer onshore and increase
close to 15 kt across charleston waters by early this evening
into tonight. Ga waters will see light offshore winds early this
morning becoming onshore later today and tonight, speeds will
be closer to 10 kt. Seas will average 2-3 ft near shore with 3-4
ft offshore and some 5 footers out closer to the gulf stream.

Thursday through Monday: a warm front will shift north through the
area Thursday night/Friday. A cold front will then move through
Friday night/early Saturday. At some point prior to the cold frontal
passage sea fog could develop across the cooler near shore waters
and lead to low visibilities. Conditions will go downhill again
Monday as a storm system approaches from the west.

Expect a high chance for advisories Thursday night across the outer
waters, expanding northward into the sc waters into Friday night as
strengthening winds build seas to 6-7 feet, highest toward the gulf
stream.

Rip currents: moderate risk for rip currents along the sc coast
today. Winds becoming onshore and increasing late along with
long period 2-3 foot swells may produce rip currents. The
combination of higher than normal tides, onshore winds and
swells in the surf zone will support an enhanced risk for rip
currents, possibly lasting into Friday.

Tides/coastal flooding
Strengthening onshore winds combined with swells impacting the coast
will cause saltwater inundation, especially in vulnerable coastal
areas. The high tides this evening and again on Thursday morning
could reach advisory levels, especially in sc. The Thursday
evening high tide could approach warning levels. Coastal flood
headlines are expected with each of these tide cycles.

Chs watches/warnings/advisories
Ga... None.

Sc... None.

Marine... None.

Near term...

short term... Rjb
long term... Rjb
aviation... Rjb
marine... Rjb
tides/coastal flooding...



Weather Reporting Stations
   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map
Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 1 mi45 min N 4.1 G 6 65°F 64°F1014.6 hPa
FBIS1 - Folly Island, SC 6 mi63 min NW 2.9 G 4.1 64°F 1014.6 hPa (-0.0)63°F
ACXS1 - ACE Basin Reserve, SC 32 mi78 min Calm 61°F 1014 hPa61°F
41033 43 mi55 min W 5.8 G 9.7 65°F 63°F1014 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 47 mi73 min W 14 G 16 68°F 71°F5 ft1013.2 hPa (-0.0)65°F

Wind History for Charleston, SC
(wind in knots)    EDIT      (on/off)   Help
7
AM
8
AM
9
AM
-12
PM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
Last
24hr
SW6
G9
SW6
G9
SW9
G12
SW8
G11
SW7
G13
S8
S10
G13
S11
G15
SW10
G17
SW11
G17
SW11
G15
SW7
SW7
G10
SW5
SW5
SW6
G9
SW7
SW6
G9
SW4
G7
SW4
W7
NW5
NW4
1 day
ago
--
SE1
E2
SE4
S6
G9
S9
S11
G16
S11
G14
S10
G13
S15
S13
G17
S9
G12
S8
S5
S6
S5
SW4
S4
S7
SW4
S5
SW6
G10
SW4
SW5
G8
2 days
ago
--
--
SE1
E5
E4
E6
G9
SE5
G8
SE9
SE8
G11
S11
G14
SE11
G15
SE7
S9
SE8
SE7
S7
S7
S7
S7
S6
S6
S3
S2
SW3

Airport Reports
    EDIT      (on/off)   Help   Click EDIT to display multiple airports
AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC7 mi68 minN 010.00 miFair63°F62°F100%1014.2 hPa
Mount Pleasant Regional-Faison Field, SC11 mi68 minN 02.50 miFog/Mist61°F60°F100%1014.2 hPa
Charleston, Charleston Air Force Base, SC12 mi67 minN 57.00 miShallow Fog58°F55°F93%1014.1 hPa

Wind History from JZI (wind in knots)
8
AM
9
AM
10
AM
11
AM
12
PM
1
PM
2
PM
3
PM
4
PM
5
PM
6
PM
7
PM
8
PM
9
PM
10
PM
11
PM
12
AM
1
AM
2
AM
3
AM
4
AM
5
AM
6
AM
7
AM
Last 24hrSW6S5SW9SW9S11S9S11S13S15SW12S11S12
G18
W7
G12
S7S3SW8SW6SW5SW6SW5W4CalmCalmNW4
1 day agoCalmCalmSE4S6S10S10S11SE10
G16
S13S12S12S10S7S6S4S3CalmS5S6S5S7SW5S5S8
2 days agoCalmCalmSE5SE6SE7S8S11S10S10SE10
G15
S10S7SE3SE5SE4SE6SE6SE4SE4S5S4CalmCalmCalm

Tide / Current Tables for Fort Johnson, South Carolina
   EDIT   RT Ports Option   Weekend mode (on/off)   (on/off)   Help   One Week of Data
Fort Johnson
Click for Map
Wed -- 03:34 AM EDT     -0.82 feet Low Tide
Wed -- 07:11 AM EDT     Sunrise
Wed -- 08:24 AM EDT     Moonrise
Wed -- 09:39 AM EDT     5.69 feet High Tide
Wed -- 03:51 PM EDT     -0.93 feet Low Tide
Wed -- 07:37 PM EDT     Sunset
Wed -- 09:32 PM EDT     Moonset
Wed -- 09:55 PM EDT     6.23 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.51.80.3-0.7-0.70.21.83.54.85.65.75.13.92.30.6-0.6-0.9-0.21.43.34.95.96.25.8

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
   EDIT      (on/off)   Help   One Week of Data
Charleston Harbor Entrance
Click for Map
Wed -- 01:09 AM EDT     -3.16 knots Max Ebb
Wed -- 04:10 AM EDT     0.00 knots Slack
Wed -- 06:41 AM EDT     2.18 knots Max Flood
Wed -- 07:11 AM EDT     Sunrise
Wed -- 08:24 AM EDT     Moonrise
Wed -- 10:21 AM EDT     -0.00 knots Slack
Wed -- 01:30 PM EDT     -3.03 knots Max Ebb
Wed -- 04:25 PM EDT     0.00 knots Slack
Wed -- 07:02 PM EDT     2.34 knots Max Flood
Wed -- 07:37 PM EDT     Sunset
Wed -- 09:32 PM EDT     Moonset
Wed -- 10:44 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2.6-3.1-2.8-1.6-0.21.122.11.81.30.4-0.9-2.1-2.9-2.9-2-0.60.81.92.321.50.8-0.3

Weather Map and Satellite Images
       (on/off)   Help
Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Southeast    EDIT
Geos

Wind Forecast for Charleston, SC (7,2,3,4)
      (on/off)   Help

Ground Weather Radar Station Charleston, SC
   (on/off)   Help
weather_mapweather_map weather_map

Ad by Google

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 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.