Tuesday, October24, 2017 L-36.com


Marine Weather and Tides
Seabrook Island, SC

Version 3.4
What's New / NOTES
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 7:30AMSunset 6:37PM Tuesday October 24, 2017 7:03 AM EDT (11:03 UTC) Moonrise 10:42AMMoonset 9:17PM Illumination 18% Phase: Waxing Crescent; Moon at 4 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- 508 Am Edt Tue Oct 24 2017
Today..W winds 5 to 10 kt.
Tonight..NW winds 5 to 10 kt.
Wed..NW winds 10 to 15 kt.
Wed night..NW winds 5 to 10 kt.
Thu..NW winds 5 to 10 kt, becoming W in the afternoon.
Thu night..SW winds around 5 kt in the evening, becoming variable winds 5 kt.
Fri..E winds around 5 kt.
Fri night..E winds around 5 kt.
Sat..E winds 5 kt. A chance of showers.
Sat night..E winds 5 kt. A chance of showers. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 73 degrees.
AMZ300 508 Am Edt Tue Oct 24 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure and dry weather will prevail into late this week before a weak area of low pressure from the south possibly affects the area and a cold front approaches from the west. High pressure should then return early next week with cooler temperatures.

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 240949
afdchs
area forecast discussion
national weather service charleston sc
549 am edt Tue oct 24 2017

Synopsis
High pressure and dry weather will prevail into late this week
before a weak area of low pressure from the south possibly
affects the area and a cold front approaches from the west.

High pressure should then return early next week with cooler
temperatures.

Near term through tonight
As of 545 am: IR satellite detected a few patches of mid clouds
across the coastal counties and over the adjacent atlantic
waters. These clouds were lifting NE across the region, likely
pushing north of the forecast area shortly after sunrise. I will
update the forecast to adjust sky timing and reduce pops.

As of 320 am: kclx indicated a line of weak reflectivity
associated with the cold front around 50 nm offshore. The cold
front should push well east of the marine zones before becoming
stationary. In the wake of the front, sfc high pressure will
slowly build east across SE ga and sc. Near term guidance shows
a large longwave h5 trough will cover much of the CONUS east of
the rockies today, with the trough axis reaching the carolinas
late tonight. The CWA will remain on the east side of the trough
through most of the day. CAA at h85 should remain weak through
mid afternoon, with temperatures expected to only cool a few
degrees today. However, nam12 times a secondary surge of caa
sliding east of the southern appalachians by mid day, reaching
the inland ga and sc counties between 21z to 0z. H85
temperatures over the middle savannah river valley is forecast
to cool from 8c from 0z Wed to 2.5c by 12z wed. High temperature
this afternoon should range generally in the mid 70s, a few
areas across the interior coastal counties could see upper 70s.

With active caa, min temperatures are forecast to range from the
mid 40s across the inland counties to the mid 50s across the
beaches.

Short term Wednesday through Friday
High pressure will build from the northwest through the period and
keep dry weather in place. On Wednesday temperatures will likely
struggle to reach 70 degrees given the strong cold advection, with
the lowest temperatures likely to be Thursday morning when many
inland locales could reach the lower 40s, possibly closer to 40 in
some of the normally colder rural areas. Expect slow moderation in
temps thereafter with highs Friday likely getting back close to
normal in the mid 70s.

Long term Friday night through Monday
As high pressure centered to the northeast moves offshore a coastal
trough will likely develop off the southeast u.S. Coast. This
feature will likely push inland Saturday bringing a few showers to
the area. Meanwhile a deep upper trough will be strengthening to the
west across the central u.S. And weak low pressure will be shifting
northward from the caribbean toward florida. This will lead to
increasing moisture and rain chances across the area mainly late
Saturday and Saturday night. Still too early to tell if the low will
take on tropical or subtropical characteristics but it should be
weak either way. The main impact at this time appears to be the
threat for some heavy rainfall, especially near the coast.

Temperatures will likely be near or above normal through Saturday
night before falling below normal by next Monday. In fact there
could be some upper 30s well inland Monday morning and possibly
even Tuesday.

Aviation 10z Tuesday through Saturday
Vfr. At 515z: kclx indicated a fine line of weak reflectivity
around 20 nm off the coast, likely associated with the position
of the cold front. IR satellite indicated a few patches of mid
level clouds near the coast, with ksav likely under one of the
patches between 6z until 08z. High pressure will steadily build
across the region today, with a secondary surge of CAA this
evening. Winds should favor a wnw direction, however, winds
could shift from the south preceding the CAA late this
afternoon.

Extended aviation outlook: no significant concerns Wed through fri
night. Risk for restrictions increase Sat into Sun as low pressure
and a cold front likely affect the area.

Marine
In the wake of a departing cold front, high pressure will slowly
build across the coastal waters today. CAA is expected to remain
very weak through the daylight hours, as the pressure gradient
remains flat. As a result, wnw winds are forecast to remain around
10 kts or less by mid morning. As a result, wave heights will trend
lower through today, with 6 ft wave subsiding within amz374 shortly
after sunrise this morning. Small craft advisories are scheduled to
expire by 11 am. A secondary and stronger surge of CAA will spread
across the marine zones tonight. During the late night hours, near
term guidance indicates that the sfc pressure gradient will range
around 2 mbs between the santee river and the altamaha river.

Northwest will gradually strengthen through the overnight hours,
reaching 15 to 20 kts, occasional gusts around 25 kts are possible
across amz374. Wave height are expected to build around one foot
higher tonight. Winds and seas should remain below small craft
advisory criteria.

Wednesday through Sunday: winds seas will remain elevated through
Wednesday night given the cold air advection and pressure gradient
but should remain below advisory levels, except possibly early
Wednesday in the eastern portion of the offshore ga waters where 6
ft seas could occur. Much improved conditions will return by
Thursday as high pressure builds back in and persists through
Friday. A coastal trough should develop Friday night and push inland
Saturday ahead of an area of low pressure possibly affecting the
area this weekend along with a cold front. Although winds seas could
surge ahead of the low pressure the worst conditions will likely
develop Sunday behind the front due to the strong pressure
gradient cold air advection and small craft advisories will be
possible.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory until 11 am edt this morning for amz350-
374.

Near term... Ned
short term... Rjb
long term... Rjb
aviation... Ned rjb
marine... Ned rjb


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 14 mi64 min W 2.9 G 4.1 64°F 1012.1 hPa (+0.4)60°F
CHTS1 17 mi46 min NNW 2.9 G 8.9 66°F 73°F1011.3 hPa
ACXS1 - ACE Basin Reserve, SC 17 mi79 min Calm 62°F 1012 hPa58°F
41033 27 mi56 min WNW 9.7 G 14 66°F
41029 - Capers Nearshore (CAP 2) 30 mi56 min WNW 7.8 G 12 65°F 73°F1011.3 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 55 mi44 min NNW 9.7 G 16 72°F 80°F1011.2 hPa62°F

Wind History for Charleston, SC
(wind in knots)    EDIT      (on/off)   Help
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N8
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NW4
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC10 mi69 minN 010.00 miMostly Cloudy63°F60°F94%1011.8 hPa
Charleston, Charleston Air Force Base, SC22 mi68 minWSW 410.00 miMostly Cloudy63°F60°F90%1011.3 hPa

Wind History from JZI (wind in knots)
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Last 24hrSE7S6SE13
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W4W8W5W6NW5CalmCalmCalm
1 day agoN3N5NE6NE7NE11
G17
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E12E6E6
G11
S5N56
G11
E6E12E7CalmCalmCalmE8
G14
SE4S9S11SE5E3
2 days agoCalmCalmN5N6NE9NE6NE8E10E9E11NE11NE9NE8NE7NE8
G13
NE7NE8NE7NE8NE6NE4N6N5N6

Tide / Current Tables for Kiawah River Bridge, South Carolina
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Kiawah River Bridge
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Tue -- 05:22 AM EDT     0.82 feet Low Tide
Tue -- 07:31 AM EDT     Sunrise
Tue -- 11:41 AM EDT     Moonrise
Tue -- 11:56 AM EDT     6.21 feet High Tide
Tue -- 06:03 PM EDT     1.06 feet Low Tide
Tue -- 06:37 PM EDT     Sunset
Tue -- 10:17 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.44.83.72.51.50.911.83.14.45.466.25.953.72.51.51.11.42.33.54.55.1

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
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Tue -- 02:43 AM EDT     -1.76 knots Max Ebb
Tue -- 05:48 AM EDT     0.00 knots Slack
Tue -- 07:30 AM EDT     Sunrise
Tue -- 08:28 AM EDT     1.48 knots Max Flood
Tue -- 11:40 AM EDT     Moonrise
Tue -- 12:13 PM EDT     -0.00 knots Slack
Tue -- 03:34 PM EDT     -2.05 knots Max Ebb
Tue -- 06:35 PM EDT     Sunset
Tue -- 06:40 PM EDT     0.00 knots Slack
Tue -- 08:52 PM EDT     1.39 knots Max Flood
Tue -- 10:15 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.5-1.2-1.7-1.7-1.4-0.60.10.91.41.41.10.70.2-0.7-1.5-2-2-1.4-0.60.31.11.410.5

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.