Wednesday, April26, 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 6:35AMSunset 7:59PM Wednesday April 26, 2017 7:54 AM EDT (11:54 UTC) Moonrise 5:58AMMoonset 7:21PM Illumination 0% Phase: New Moon; Moon at 0 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
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AMZ330 Charleston Harbor- 634 Am Edt Wed Apr 26 2017
Today..S winds 5 to 10 kt.
Tonight..S winds 10 kt.
Thu..S winds 10 to 15 kt.
Thu night..S winds 10 to 15 kt. A slight chance of showers and Thunderstorms in the evening.
Fri..S winds 10 to 15 kt.
Fri night..S winds 10 to 15 kt.
Sat..S winds 10 to 15 kt.
Sat night..S winds 10 to 15 kt.
Sun..S winds 10 to 15 kt.
Sun night..S winds 15 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...73 degrees.
AMZ300 634 Am Edt Wed Apr 26 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail across the region today and tonight. A weak disturbance is expected to affect the area Thursday night, followed by high pressure Friday into the weekend. A cold front will affect the area Monday and Monday night before high pressure rebuilds.

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


Area Discussion for - Charleston, SC
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Fxus62 kchs 261046
afdchs
area forecast discussion
national weather service charleston sc
646 am edt Wed apr 26 2017

Synopsis
High pressure will prevail across the region today and tonight.

A weak disturbance is expected to affect the area Thursday
night, followed by high pressure Friday into the weekend. A cold
front will affect the area Monday and Monday night before high
pressure rebuilds.

Near term /through tonight/
As of 645 am: satellite and sfc observations indicated a few
areas of patchy inland fog early this morning. However, I expect
that the fog is very thin and will dissipate over the next
hour. I will adjust mention of patchy fog in the forecast.

Otherwise, today should remain dry with highs around 5 degrees
above normal.

As of 450 am: latest satellite images indicated a patch of mid
clouds moving across berkeley and east charleston counties.

After the patch moves east out of the forecast area, sky should
remain clear through the rest of the morning. I will update to
mainly adjust cloud placement and timing.

Previous discussion:
mid level short wave ridge will ripple over
the forecast area this afternoon. At the sfc, the CWA will
remain between organizing low pressure over arkansas and high
pressure over the western atlantic. The pressure pattern will
provide the region with strengthening sse flow through this
afternoon, peaking between 10-15 mph during the heat of the
afternoon. The combination of sse flow and high temps well into
the mid to upper 80s inland should yield a sea breeze this
afternoon. Forecast soundings indicate that a strong inversion
will remain centered around h7, with CIN remain through this
afternoon. Based on the forecast moisture and temperature
profile, it appears that CU will remain very limited this
afternoon.

Tonight, sfc low pressure will track across the heartland, sweeping
the associated cold front across middle tn by sunrise Thursday.

Return flow across the CWA will remain steady through the overnight
hours. Overall, sky conditions are expected to remain clear to
mostly clear. However, higher clouds should begin to arrive from the
west during the pre dawn hours. Using a blend of temperature
guidance, low temperatures should range in the low to mid 60s, with
upper 60s across the sea islands.

Short term /Thursday through Saturday/
Strengthening high pressure over the central atlantic and a
digging shortwave trough over the ohio valley will allow
increasing moisture to move into the area. Weak upper forcing
associated with the shortwave and a decaying cold front may
kick off a few showers or thunderstorms, mainly Thursday afternoon
and evening across inland areas. Otherwise, a building upper
ridge with strong warm advection will favor a warming trend with
highs climbing into the 90s across inland areas Friday and
Saturday.

Long term /Saturday night through Tuesday/
The pattern shifts during the long term as a large upper trough
shifts east and a cold front sweeps through Monday and Monday
night. A few showers possible inland on Sunday as some upper
vorticity energy moves through, but the best rain chances will
be Monday and Monday night.

Aviation /12z Wednesday through Sunday/
Vfr through the 12z tafs.

Extended aviation outlook: no significant concerns.

Marine
Today, at the sfc, the marine zones will remain between organizing
low pressure over arkansas and high pressure over the western
atlantic. The pressure pattern will provide the region with
strengthening sse flow through this afternoon, peaking around 15 kts
during the heat of the afternoon. Return flow should remain steady
over the waters tonight, turning from the ssw. Wave heights within
20 nm are forecast to remain between 2-3 feet, increasing to 3-4
feet beyond 20 nm tonight.

A summertime pattern will prevail Thursday into Sunday as
atlantic high pressure maintains onshore flow and a sea breeze
develops each afternoon. Strengthening southeast flow ahead of a
cold front Monday will likely result in small craft advisory
seas over most of the waters starting Sunday night and
persisting into Monday night.

Rip currents... The combination of swell impacting the beaches, an
afternoon sea breeze, and the upcoming perigean spring tide will
generate a moderate risk of rip currents today.

Tides/coastal flooding
The upcoming perigean spring tide and recent elevated
departures will allow for potential shallow coastal flooding
with the evening high tides today through Saturday. Coastal
flood advisories will likely be required.

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

Sc... None.

Marine... None.

Near term... Ned
short term... Jrl
long term... Jrl
aviation... Jrl/ned
marine... Jrl/ned
tides/coastal flooding...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 1 mi54 min S 5.1 G 5.1 70°F 74°F1008.8 hPa (+0.5)
FBIS1 - Folly Island, SC 6 mi54 min SSE 6 G 7 71°F 1009.3 hPa (+0.6)69°F
41029 - Capers Nearshore (CAP 2) 15 mi46 min SSW 9.7 G 14 72°F 71°F1008.5 hPa
ACXS1 - ACE Basin Reserve, SC 32 mi69 min Calm 63°F 1009 hPa
41033 43 mi46 min W 9.7 G 14 69°F 70°F1009 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 47 mi44 min SSW 5.8 G 5.8 71°F 73°F1008.9 hPa68°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC7 mi59 minN 05.00 miFog/Mist63°F62°F100%1008.8 hPa
Mount Pleasant Regional-Faison Field, SC11 mi79 minN 010.00 miFair61°F60°F100%1008.8 hPa
Charleston, Charleston Air Force Base, SC12 mi2 hrsN 010.00 miA Few Clouds61°F57°F90%1008 hPa

Wind History from CHS (wind in knots)
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Last 24hrW7W12NW11W12NW11
G19
W11W12NW10W9NW7W6W7W4NW3CalmSE3CalmCalmCalmCalmSE4S3CalmS4
1 day agoE8SE7S12SE6SE9SE93NW4--NE7NE8NE4NW3CalmW9W5W3NW7W5W5NW10NW8NW8W8
2 days agoS8SW10S6S7S10
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S13S4SE7E7

Tide / Current Tables for Fort Johnson, South Carolina
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Fort Johnson
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Wed -- 02:27 AM EDT     -0.71 feet Low Tide
Wed -- 06:37 AM EDT     Sunrise
Wed -- 06:57 AM EDT     Moonrise
Wed -- 08:18 AM EDT     New Moon
Wed -- 08:28 AM EDT     5.65 feet High Tide
Wed -- 02:39 PM EDT     -0.98 feet Low Tide
Wed -- 07:57 PM EDT     Sunset
Wed -- 08:19 PM EDT     Moonset
Wed -- 08:47 PM EDT     6.57 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.70.3-0.6-0.60.52.13.755.65.64.93.61.90.3-0.8-0.901.83.85.46.36.66.14.9

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Wed -- 12:01 AM EDT     -3.20 knots Max Ebb
Wed -- 03:05 AM EDT     0.00 knots Slack
Wed -- 05:28 AM EDT     2.09 knots Max Flood
Wed -- 06:37 AM EDT     Sunrise
Wed -- 06:57 AM EDT     Moonrise
Wed -- 08:18 AM EDT     New Moon
Wed -- 09:10 AM EDT     -0.00 knots Slack
Wed -- 12:21 PM EDT     -3.05 knots Max Ebb
Wed -- 03:14 PM EDT     0.01 knots Slack
Wed -- 05:50 PM EDT     2.42 knots Max Flood
Wed -- 07:57 PM EDT     Sunset
Wed -- 08:19 PM EDT     Moonset
Wed -- 09:37 PM EDT     -0.01 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-3.2-2.7-1.5-0.11.2221.61.10.2-1.1-2.3-3-2.8-1.8-0.31.12.12.42.11.60.8-0.5-2

Weather Map and Satellite Images
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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)
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Ground Weather Radar Station Charleston, SC
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weather_mapweather_map weather_map

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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.