Tuesday, June27, 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 6:12AMSunset 8:33PM Tuesday June 27, 2017 1:33 PM EDT (17:33 UTC) Moonrise 9:07AMMoonset 10:39PM Illumination 14% 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- 129 Pm Edt Tue Jun 27 2017
This afternoon..E winds 10 kt.
Tonight..SE winds 5 to 10 kt, diminishing to around 5 kt after midnight.
Wed..E winds 5 to 10 kt.
Wed night..E winds 5 to 10 kt.
Thu..E winds 5 to 10 kt.
Thu night..SE winds 5 to 10 kt. A chance of showers and tstms.
Fri..S winds 5 kt. A chance of showers and tstms.
Fri night..S winds 5 kt. A chance of showers and tstms.
Sat..SW winds 5 to 10 kt. A chance of showers and tstms.
Sat night..SW winds 5 to 10 kt. A chance of showers and tstms. Mariners are reminded that winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 84 degrees.
AMZ300 129 Pm Edt Tue Jun 27 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A stationary front will linger to the se of the area this afternoon. High pressure will pass north of the region Wednesday, then shift into the atlantic Thursday. A surface trough will develop inland on Friday and prevail into the weekend.

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 271627
afdchs
area forecast discussion
national weather service charleston sc
1227 pm edt Tue jun 27 2017

Synopsis
A stationary front will linger off the coast today. High
pressure will past north of the region Wednesday, then shift
into the atlantic Thursday. A surface trough will develop inland
on Friday and prevail into the weekend.

Near term until 6 pm this evening
Only subtle changes for the latest update, mainly to slow the
diurnal climb in temps due to insolation being limited by
various layers of clouds.

The stationary front looks to have cleared the entire forecast
area, both land and the coastal waters. Extensive jet stream
cirrus cirrostratus clouds encompass the entire region, and with
daytime heating, diurnal cumulus will develop in advance of the
sea breeze. The change to a continental air mass will lead to
slightly less humidity and temps a tad below normal for late
june, as highs reach 85-90f inland from the immediate coast.

We're within a fairly nebulous pressure pattern between the
offshore stationary front and canadian high pressure moving
into the ohio valley. There's also a fast moving mid level short
wave that reaches near our NW tier by nightfall. That feature
plus the sea breeze and differential heating boundaries will be
the main drivers for convection this afternoon. We continue to
show isolated to scattered coverage due to pwat's no more than
80-90% of normal. The greatest probabilities of showers and
t-storms will be in the 30-40% range near the altamaha river,
where there is better moisture profiles.

The overall thermodynamic atmosphere is very unimpressive, but
with the associated dry air and 0-6 km in excess of 30 kt,
where boundary collisions occur we could experience some
isolated strong wind gusts.

Short term 6 pm this evening through Friday
Tonight: any residual convection will quickly dissipate after
sunset. Dry conditions will prevail through the night. Lows will
range from the mid 60s across interior southeast south carolina
to the mid 70s at the beaches.

Wednesday through Friday: we'll get a short break from the typical
summertime heat and humidity Wednesday before it slowly return
Thursday. Shower and t- storm chances are below average
Wednesday, then creeping up Thursday and Friday.

The broad trough in the east lifts out and gives way to building
heights aloft from a building sub-tropical ridge centered near the
nw bahamas Wednesday that becomes positioned about midway between
florida and bermuda Thursday into Friday. Moisture is definitely
lacking Wednesday, with pwat's struggling to get above 1" across our
northern zones, or roughly 2 standard deviations below normal. This
is due to dry high pressure to our north holding the moisture to our
south. The high is forecasted to move offshore into the atlantic
Thursday, allowing SE flow to pump in higher pwats across our area,
much closer to normal for this time of year. The sea breeze is the
main driver of any diurnal convection during this time, and this
supports at most isolated coverage across interior SE ga Wednesday.

With better moisture Thursday we are forecasting 30-40% pops, mainly
for SE ga. Pops taper northwards into SE sc where enough dry and
subsidence aloft may remain in place to only allow afternoon cu
development. But by Friday the moisture will be in place across our
entire area. With temperatures topping out near 90 degrees and
plenty of instability in place, pops range from 40-50%. Isolated
severe storms with damaging winds are possible.

Long term Friday night through Monday
Nearly zonal flow will persist aloft with surface high pressure in
the atlantic. Southerly flow around the high will advect plenty of
moisture into the southeast as an inland trough develops this
weekend. The result will be the typical summertime
shower thunderstorm pattern with the coverage and intensity trending
upwards each day into the weekend.

Aviation 18z Tuesday through Sunday
Vfr. A few showers tstms will meander around ksav during the
afternoon, but impact probabilities are too low to show anything
more than vcsh and brokenVFR ceilings.

Extended aviation outlook:VFR Wednesday. Brief flight restrictions
are possible in afternoon evening shra tsra for ksav Thursday, then
both kcsh and ksav Friday and Saturday.

Marine
This afternoon: a stationary front will meander not far to the
se of the local waters, with the sub-tropical ridge deflected
to the e-se and continental high pressure in the ohio
valley midwest region. The end result will be a weak pressure
pattern driven mainly by sea breeze circulations. Easterly winds
will average no more than around 10 kt and seas will hold close
to 2 ft with isolated showers and t-storms, mainly south of
edisto.

Tonight: easterly winds will encompass the entire marine area
as continental high pressure remains well to the north and a
weak stationary front lingers to the south. Winds will remain
less than 10 kt with seas 1-2 ft.

Wednesday through Saturday: high pressure centered to our north
Wednesday will shift offshore Thursday and prevail in the atlantic
into the weekend. Easterly winds ~15 kt on Wednesday will veer to
the SE Thursday and ease a few kt as counter-clockwise flow develops
around the high, prevailing through the end of the week. Sea breeze
circulations will give a boost to the winds each day with
shower thunderstorm chances increasing into the weekend. Seas will
average no greater than 2-4 ft.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term...

short term...

long term...

aviation...

marine...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 14 mi34 min E 5.1 G 6 82°F 1018.2 hPa (+0.3)64°F
CHTS1 17 mi46 min N 4.1 G 7 87°F 84°F1017.7 hPa
ACXS1 - ACE Basin Reserve, SC 17 mi109 min NNE 1.9 85°F 1017 hPa69°F
41033 27 mi86 min ENE 5.8 G 7.8 81°F 83°F1017.1 hPa
41029 - Capers Nearshore (CAP 2) 30 mi86 min NNE 5.8 G 7.8 85°F 83°F1017.1 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 55 mi34 min NE 7.8 G 9.7 79°F 81°F1017 hPa (+0.4)67°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC10 mi39 minNE 4 miMostly Cloudy86°F66°F52%1017.6 hPa
Charleston, Charleston Air Force Base, SC22 mi98 minNE 510.00 miPartly Cloudy83°F64°F53%1017.1 hPa

Wind History from JZI (wind in knots)
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E5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN4CalmN5N4E6
1 day agoS8
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S9SW4N9CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW6N6NE6NE11NE10
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SW8SW6S7NW8NW4W7NW6N3CalmSE5S5

Tide / Current Tables for Kiawah River Bridge, South Carolina
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Kiawah River Bridge
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Tue -- 05:31 AM EDT     -0.41 feet Low Tide
Tue -- 06:15 AM EDT     Sunrise
Tue -- 10:07 AM EDT     Moonrise
Tue -- 11:57 AM EDT     5.78 feet High Tide
Tue -- 05:41 PM EDT     -0.31 feet Low Tide
Tue -- 08:32 PM EDT     Sunset
Tue -- 11:39 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.95.94.32.40.7-0.3-0.30.51.93.34.55.55.85.34.12.61-0.1-0.30.51.93.556.1

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
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Tue -- 02:48 AM EDT     -3.06 knots Max Ebb
Tue -- 06:01 AM EDT     0.00 knots Slack
Tue -- 06:13 AM EDT     Sunrise
Tue -- 08:17 AM EDT     1.65 knots Max Flood
Tue -- 10:06 AM EDT     Moonrise
Tue -- 12:05 PM EDT     -0.00 knots Slack
Tue -- 03:09 PM EDT     -2.60 knots Max Ebb
Tue -- 06:10 PM EDT     0.00 knots Slack
Tue -- 08:31 PM EDT     Sunset
Tue -- 08:36 PM EDT     1.83 knots Max Flood
Tue -- 11:38 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0.5-1.8-2.8-3-2.4-1.3-01.11.61.61.410.1-1.1-2.1-2.6-2.3-1.4-0.211.71.81.61.3

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 (13,3,4,5)
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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.