Thursday, March23, 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 7:16AMSunset 7:35PM Thursday March 23, 2017 6:30 AM EDT (10:30 UTC) Moonrise 3:21AMMoonset 2:14PM Illumination 18% Phase: Waning Crescent; Moon at 25 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- 336 Am Edt Thu Mar 23 2017
Today..NE winds 15 to 20 kt. Occasional gusts to 25 kt near the harbor entrance. Waves 1 to 2 ft.
Tonight..E winds 10 to 15 kt.
Fri..E winds 5 to 10 kt.
Fri night..SE winds 5 kt.
Sat..SE winds 5 to 10 kt.
Sat night..SE winds 5 to 10 kt. A slight chance of showers after midnight.
Sun and Sun night..S winds 5 to 10 kt. A slight chance of showers and tstms.
Mon and Mon night..S winds 5 to 10 kt. A slight chance of showers and tstms. 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...57 degrees.
AMZ300 336 Am Edt Thu Mar 23 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will build in from the north through tonight before shifting over the atlantic through the weekend. A cold front is expected to affect the area early next 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 230758
afdchs
area forecast discussion
national weather service charleston sc
358 am edt Thu mar 23 2017

Synopsis
High pressure will build in from the north through tonight before
shifting over the atlantic through the weekend. A cold front is
expected to affect the area early next week.

Near term /through tonight/
Cool dry high pressure will wedge down the eastern seaboard
today. The column will be quite dry across southern sc where
only some high clouds will drift through today. Greater moisture
below 800 mb across southeast ga will support partly to mostly
cloudy skies there today. Quite a bit of sunshine in most
locations will allow temperatures to reach thickness values,
which required us to raise high temps 1-3 degrees.

The surface high starts to shift east tonight, allowing a
stronger onshore flow to develop and increase low-level
moisture. Some maritime stratus may move into coastal areas
late tonight though most areas will see no greater than partly
cloudy skies.

Short term /Friday through Sunday/
Friday, the center of sfc high pressure is forecast to shift over
the western atlantic as low pressure deepens over the southern great
plains. This pattern will support steady SE winds across the
forecast area. Given partly sunny conditions and the passage of the
h5 ridge axis overhead, conditions should warm considerably from
Thursday. Using a blend of guidance, high temperatures are forecast
to range in the low to mid 70s.

Saturday, a low pressure system is expected to track from the
southern great plains to the mid west as high pressure remains over
the atlantic. Onshore winds from the SE through continue through the
period. High temperatures may warm two to four degrees warmer than
values reached on Friday.

Sunday, the base of a h5 trough is expected to rotate on the SE side
of a closed low centered over the mid west. The occluded sfc low
will slowly move north toward lake michigan through the day. The
region will remain within the warm sector, highs reaching into the
upper 70s to the low 80s with dewpoints in the upper 50s. Gfs
indicates that afternoon values of sbcapes are forecast to range
from 500 j/kg near the coast to over 1000 j/kg inland. I will
increase afternoon and evening pops to chc inland to schc over the
marine zones, mentioning both showers and thunderstorms.

Long term /Sunday night through Wednesday/
Conditions appear unsettled across the CWA Sunday night through late
Tuesday. Medium range guidance indicates that a axis of a longwave
trough will ripple across the southeast CONUS early next week. The
forecast area will remain within the warm sector, with weak to
moderate instability developing each afternoon and evening. The
environment appears the most supportive for deep convection late
Tuesday with the passage of the mid level trough and sfc boundary.

Temperatures early next week should start the day around 60 degrees
and peak around 80 by mid afternoon. Thursday and Friday, the
leading edge of a canadian air mass is expected to spread across the
cwa. Conditions should feature dry wx with slightly above normal
temperatures.

Aviation /08z Thursday through Monday/
Vfr through tonight. Gusty winds today.

Extended aviation outlook: showers and thunderstorms could develop
each afternoon and evening Sunday through Tuesday. Patchy early
morning fog is possible over wet soil.

Marine
The strongest NE gradient will continue through mid-morning over
the sc nearshore waters as the high pressure wedge builds south.

It still looks as though conditions will remain just below gale
force this morning. Winds will slowly decrease this afternoon
through tonight though seas will be slower to subside.

The center of high pressure will gradually shift over the western
atlantic Friday and Friday night, allowing seas to decrease to
around 5 feet for most areas by sunset Friday. Scas are scheduled to
expire Thursday night, expect amz374 remaining through most of
Friday. Steady south to southwest winds are forecast to remain over
the zones through the weekend into early next week. Seas could
increase to six feet across eastern amz374 during the weekend.

Scattered showers and thunderstorms are forecast to develop Sunday
through Tuesday, especially during the daylight hours.

Rip currents: a strong NE wind and a 7-8 second NE swell today
will produce a moderate risk for rip currents.

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

Sc... None.

Marine... Small craft advisory until midnight edt tonight for amz350-352-
354.

Small craft advisory until 6 pm edt Friday for amz374.

Near term... Jrl
short term... Ned
long term... Ned
aviation... Jrl/ned
marine... Jrl/ned


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 14 mi30 min ENE 22 G 25 56°F 1028.6 hPa (+0.7)44°F
CHTS1 17 mi42 min NE 14 G 18 55°F 60°F1028.4 hPa
ACXS1 - ACE Basin Reserve, SC 17 mi105 min NE 5.1 53°F 1027 hPa42°F
41033 27 mi82 min ENE 23 G 29 57°F 60°F1026.7 hPa
41029 - Capers Nearshore (CAP 2) 30 mi82 min ENE 21 G 27 55°F 1027.3 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 55 mi40 min ENE 21 G 25 61°F 66°F9 ft1026 hPa (+0.4)46°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC10 mi35 minNE 13 G 1910.00 miFair54°F39°F58%1028.4 hPa
Charleston, Charleston Air Force Base, SC22 mi94 minENE 1210.00 miFair50°F37°F61%1028 hPa

Wind History from JZI (wind in knots)
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Last 24hrCalmW8W12N9
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N11N11N12
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E11E14
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E14E12E7
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NE8NE11NE7
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1 day agoSW8S5SW6SW7S9S9--S11S13S14SW13S10SW9S9SW13
G21
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SW7W22
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CalmSW4S9SW5Calm
2 days agoCalmCalmCalmCalm5S6
G11
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G18
S11S12S7SW6SW6SW5SW4CalmSW4S4S7S7S8SW9
G14

Tide / Current Tables for Kiawah River Bridge, South Carolina
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Kiawah River Bridge
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Thu -- 04:21 AM EDT     Moonrise
Thu -- 05:10 AM EDT     5.39 feet High Tide
Thu -- 07:20 AM EDT     Sunrise
Thu -- 11:24 AM EDT     0.61 feet Low Tide
Thu -- 03:14 PM EDT     Moonset
Thu -- 05:27 PM EDT     4.97 feet High Tide
Thu -- 07:34 PM EDT     Sunset
Thu -- 11:38 PM EDT     0.45 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.22.23.44.45.15.45.24.53.42.31.30.70.71.52.63.74.54.94.94.33.32.31.30.6

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
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Thu -- 01:40 AM EDT     1.21 knots Max Flood
Thu -- 04:20 AM EDT     Moonrise
Thu -- 05:30 AM EDT     -0.00 knots Slack
Thu -- 07:18 AM EDT     Sunrise
Thu -- 08:52 AM EDT     -1.88 knots Max Ebb
Thu -- 11:57 AM EDT     0.00 knots Slack
Thu -- 02:04 PM EDT     1.31 knots Max Flood
Thu -- 03:13 PM EDT     Moonset
Thu -- 05:34 PM EDT     -0.00 knots Slack
Thu -- 07:33 PM EDT     Sunset
Thu -- 09:02 PM EDT     -1.68 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.51.11.20.90.70.3-0.4-1.1-1.7-1.9-1.5-0.800.91.31.10.70.3-0.3-1-1.5-1.7-1.5-0.9

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 (6,6,7,8)
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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.