Saturday, April29, 2017 L-36.com


Marine Weather and Tides
Seabrook 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 6:32AMSunset 8:01PM Saturday April 29, 2017 1:21 AM EDT (05:21 UTC) Moonrise 8:29AMMoonset 10:42PM Illumination 11% Phase: Waxing Crescent; Moon at 3 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- 922 Pm Edt Fri Apr 28 2017
Tonight..S winds 10 kt. Patchy fog.
Sat..S winds 5 to 10 kt...increasing to 15 kt in the afternoon.
Sat night..S winds 5 to 10 kt.
Sun..S winds 5 to 10 kt...increasing to 15 kt in the afternoon.
Sun night..S winds 15 kt.
Mon..S winds 15 to 20 kt with gusts to 30 kt. Waves 1 to 2 ft. A chance of showers and Thunderstorms.
Mon night..S winds 15 to 20 kt with gusts to 30 kt... Becoming sw 15 kt after midnight. Waves 1 to 2 ft. Showers and Thunderstorms likely.
Tue..W winds 10 kt.
Tue night..SW winds around 5 kt.
Wed..SW winds 5 to 10 kt.
Wed night..S winds 5 to 10 kt. A chance of showers and Thunderstorms. 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...75 degrees.
AMZ300 922 Pm Edt Fri Apr 28 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Broad high pressure will remain over the region through this weekend. A cold front will move through Monday night...then a stronger storm system will affect the area late week.

7 Day Forecast for Marine Location Near Seabrook Island, SC
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location: 32.6, -80.13     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 290212
afdchs
area forecast discussion
national weather service charleston sc
1012 pm edt Fri apr 28 2017

Synopsis
Early summer conditions will prevail over the weekend as strong
high pressure holds offshore. A cold front will cross the coast
early Tuesday bringing a chance of showers. A gulf low pressure
system may bring a soaking rain late next into the early part
of next weekend.

Near term /until 6 am Saturday morning/
A building ridge aloft and strengthening high pressure at the
surface and lower levels will encompass the area through the
night. A warm night for late april is expected with decent
mixing in the boundary layer, so no lower than the upper 60s
well inland and low to middle 70s along the coast to occur. In
fact we'll likely set a record high minimum temp for april 28th
at both kchs and kcxm.

Low stratus/stratocumulus over much of charleston and far
eastern berkeley counties will expand in coverage through the
night as isentropic ascent persists and a sharp inversion
develops around 800-1000 ft with considerable moisture
underneath. There is probably too much mixing within the
boundary layer for much more than shallow ground fog far inland
late, but due to some concern over sea fog, we have maintained
mention of patchy fog along the coastal zones where the lowest
condensation pressure deficits are situated.

Smoke from the west mims wildfire in the okefenokee swamp has
been spreading north toward tattnall and long counties, but
there have been no signs of any reductions in surface
visibility, so far. Still, parts of SE ga could experience a
smell of smoke in the air tonight within the southerly flow.

Short term /6 am Saturday morning through Monday/
As of 3 pm Friday: highly amplified pattern creates hot
temperatures through the weekend ahead of a cold front which
will cross offshore Monday night.

590+ dm ridge will be centered just offshore Saturday before slowly
migrating eastward on Sunday. This ridging combined with surface
bermuda-type high pressure will push 850mb temps up to 14-16c, which
combined with abundant sunshine thanks to exceedingly dry air aloft
will drive highs into the low 90s inland on Saturday, mid 80s at the
coast, but still only around 80 at the beaches due to a strong and
early-developed sea breeze. Temps on Sunday will be only a degree or
two cooler as the thermal ridge weakens slightly. While isolated sea
breeze showers are possible each aftn, the very dry air aloft will
cap potential, and will continue inherited silent pop Saturday, schc
on Sunday. As the cold front begins to encroach on the area late
Sunday, and especially on Monday, southerly winds will crank up as
well, keeping minimums well above seasonable norms, falling only to
a degree or two either side of 70 both Saturday and Sunday nights.

The cold front Monday will race east as a bowling ball upper low
rotates into the great lakes pushing the cold front off the coast by
Tuesday morning. Timing of FROPA is expected to be late Monday
night, but strong shear and moderate instability ahead of it will
create a good chance for tstms Monday aftn and Monday night.

Increased cloud cover and lowering heights will keep highs and lows
on Monday several degrees cooler than during the weekend.

Long term /Monday night through Friday/
A weakening cold front looks to push offshore Monday night followed
by generally drier/cooler weather through Wednesday before rain
chances return with the approach of another storm system. At this
point there is uncertainty regarding this system so forecast
confidence is lower than normal, especially later in the week.

Temperatures should be near or above normal, but could drop below
normal Friday if the storm departs by then.

Aviation /02z Saturday through Wednesday/
Kchs: areas of pre-existing low clouds near the terminal will
spread into or develop over the airfield overnight, leading to
MVFR or potentially ifr conditions most of the time through 14z
Saturday. Gusty S winds will be common Saturday afternoon with
deep mixing and sea breeze circulations to occur during the
warmest part of the day.

Ksav:VFR conditions will prevail much of tonight and Saturday.

Outside the exception of about 4-5 hours of MVFR or possible ifr
weather in low stratus a few hours either side of daybreak
Saturday. Gusty s-se winds to occur Saturday afternoon due to
the sea breeze, deep mixing and peak heating.

Extended aviation outlook: restrictions due to low ceilings will be
possible at either terminal Saturday night, possibly persisting
into early the following morning. Ceiling and/or vsby restrictions
will again be possible Monday into early Monday night due to
showers and/or thunderstorms. Also... Breezy/gusty conditions
expected Monday.

Marine
Overnight: strengthening high pressure will the atlantic will
remain across the waters, resulting in s'erly winds around 12-17
kt, a little less in charleston harbor. Seas will hold fairly
steady throughout the night, averaging 3-4 ft.

While trajectories are not entirely favorable for sea fog, given
the elevated dew points in the lower and middle 70s plus pre-
existing and/or developing low stratus, we maintain mention of
patchy fog in the forecast. Some of the fog/stratus could move
into the charleston harbor at times, and we will maintain a
close weather watch for possible dense fog.

Saturday through Wednesday: high pressure offshore will be the
dominant feature through the weekend before a cold front
approaches the waters late Monday. Between these two features,
southerly winds will gradually increase during the weekend,
rising from 10-15 kts Saturday, to 15-20 kts by late Sunday. As
the cold front approaches during Monday, winds will veer more to
the SW and increase further to 20-25 kts, and an SCA will
likely be needed as seas build from 2- 4 ft Saturday, to as high
as 5-7 ft on Monday, with some 8 ft seas possible in the outer
portion of the ga waters. For charleston harbor, winds are
forecast to also go above SCA thresholds, primarily late Monday
immediately ahead of the fropa.

Tides/coastal flooding
Abased on recent departures, we have cancelled the coastal flood
advisory from jasper and chatham counties south to mcintosh, as
tides will not reach the required 9.2 ft mllw level with the
next high tide. We did hold onto the advisory though for
charleston, colleton and beaufort counties, as tides in
charleston harbor will reach as high as 7.2 ft mllw with the
latest high tide cycle.

Climate
Record high temperatures for april 28th...

kchs... 69 set in 1954.

Kcxm... 72 set in 1985.

Ksav... 71 set in 2014.

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

Sc... Coastal flood advisory until midnight edt tonight for
scz048>050.

Marine... None.

Near term...

short term...

long term...

aviation...

marine...

tides/coastal flooding...

climate...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 14 mi82 min S 15 G 17 75°F 1021.3 hPa (+0.6)75°F
CHTS1 17 mi52 min S 9.9 G 14 76°F 75°F1021 hPa
ACXS1 - ACE Basin Reserve, SC 17 mi97 min S 1 76°F 1021 hPa74°F
41033 27 mi74 min S 12 G 16 74°F 72°F1020.1 hPa
41029 - Capers Nearshore (CAP 2) 30 mi74 min S 14 G 18 74°F 75°F1020.6 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 55 mi42 min S 14 G 16 76°F 74°F1021 hPa74°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC10 mi27 minSSE 107.00 miFair75°F73°F94%1020.7 hPa
Charleston, Charleston Air Force Base, SC22 mi26 minS 710.00 miPartly Cloudy74°F71°F91%1020.7 hPa

Wind History from JZI (wind in knots)
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1 day agoS7S7SW7SW8S5S5SW9SW7S9S10S12
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2 days agoCalmCalmCalmCalmCalmCalmS4SW6W86SW10S12S12S11S11
G16
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Tide / Current Tables for Kiawah River Bridge, South Carolina
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Kiawah River Bridge
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Sat -- 05:13 AM EDT     -0.42 feet Low Tide
Sat -- 06:35 AM EDT     Sunrise
Sat -- 09:29 AM EDT     Moonrise
Sat -- 11:32 AM EDT     5.84 feet High Tide
Sat -- 05:23 PM EDT     -0.47 feet Low Tide
Sat -- 08:00 PM EDT     Sunset
Sat -- 11:42 PM EDT     Moonset
Sat -- 11:56 PM EDT     7.02 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.85.53.71.90.4-0.4-0.112.545.15.75.753.61.90.5-0.4-0.30.82.54.25.76.7

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
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Sat -- 02:32 AM EDT     -3.26 knots Max Ebb
Sat -- 05:39 AM EDT     0.00 knots Slack
Sat -- 06:34 AM EDT     Sunrise
Sat -- 08:00 AM EDT     1.95 knots Max Flood
Sat -- 09:27 AM EDT     Moonrise
Sat -- 11:41 AM EDT     -0.00 knots Slack
Sat -- 02:49 PM EDT     -2.77 knots Max Ebb
Sat -- 05:44 PM EDT     0.00 knots Slack
Sat -- 07:59 PM EDT     Sunset
Sat -- 08:22 PM EDT     2.18 knots Max Flood
Sat -- 11:41 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.9-2.3-3.1-3.2-2.3-0.90.41.51.91.71.30.7-0.4-1.6-2.5-2.8-2.2-10.31.52.12.11.71.2

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 (1,6,7,8)
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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.