Tuesday, September26, 2017 L-36.com


Marine Weather and Tides
Summerville, 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 7:11AMSunset 7:12PM Tuesday September 26, 2017 7:06 AM EDT (11:06 UTC) Moonrise 12:00PMMoonset 10:38PM Illumination 33% Phase: Waxing Crescent; Moon at 6 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- 626 Am Edt Tue Sep 26 2017
Today..N winds 10 to 15 kt, becoming nw 10 kt late this morning and afternoon.
Tonight..NW winds 5 to 10 kt.
Wed..NW winds 5 to 10 kt.
Wed night..W winds 5 kt.
Thu..NW winds 5 kt, becoming W in the afternoon.
Thu night..S winds 5 kt, becoming W after midnight.
Fri..NE winds 5 kt. A chance of showers and tstms.
Fri night..E winds 5 kt. A slight chance of showers and tstms.
Sat..NE winds 10 to 15 kt. A chance of showers and tstms.
Sat night..NE winds 10 kt. A slight 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 81 degrees.
AMZ300 626 Am Edt Tue Sep 26 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Hurricane maria will track northward off the southeast u.s. Coast through midweek before turning east-northeast and away from the coast into late week. A cold front will move through the area by early this weekend, followed by high pressure into early next week. Refer to the latest advisory on maria issued by the national hurricane center.

7 Day Forecast for Marine Location Near Summerville, SC
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location: 32.96, -80.2     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 261105
afdchs
area forecast discussion
national weather service charleston sc
705 am edt Tue sep 26 2017

Synopsis
Hurricane maria will track northward off the southeast u.S.

Coast through midweek before turning east-northeast and away
from the coast into late week. A cold front will move through
the area by early this weekend, followed by high pressure into
early next week.

Near term through tonight
This morning: an expanding area of stratus over georgetown and
horry counties of sc will advect into parts of berkeley county
and northern charleston county during the mid morning, before
it erodes or lifts into a stratocumulus or flat cumulus deck
thereafter. Elsewhere skies will be generally sunny.

Today: hurricane maria will pass several hundred miles off the
coast as it moves slowly northward. Her broad circulation will
encompass the vast majority of the area, but large scale
subsidence on the w-sw periphery of the cyclonic flow which will
cover the region, plus a void of moisture above the first mile
or two of the troposphere will provide us with another day free
of rain. Other than few-scattered cirrus near the santee river
basin and scattered stratocumulus cumulus that develop, skies
will be sunny to partly cloudy. With plenty of insolation and a
warm and sinking air mass in place, MAX temps will reach the
upper 80s to near 90f most communities this afternoon, except
for a few mid 80s N of i-26 where the lower clouds could be a
little greater in coverage.

Tonight: maria will continue her motion northward to a position
to the E of CAPE hatteras by morning. The environment locally
remains warm and dry, with only a little wrap-around cirrus
and or altocumulus to occur around the tropical cyclone across
our sc zones. Light or calm winds away from the immediate coast
will result in decent radiational cooling to get temps down into
the upper 60s and lower 70s. This is still a good 5-7f above
late september normals.

Short term Wednesday through Friday
Dry conditions are expected to continue through Thursday as maria
moves away from the area. A warming trend with above normal
temperatures will persist, with most locations reaching lower 90s
Wednesday and Thursday. A cold front near the area Thursday should
complete passage through the forecast area by late Friday or early
Saturday, bringing slightly increased shower thunderstorm chances.

Temperatures Friday should peak in the upper 80s most locations with
some locations nearing 90 in southwestern zones, but uncertainty in
cloud cover and precipitation placement timing remains. Low
temperatures will range from the upper 60s to lower 70s through the
period.

Long term Friday night through Monday
High surface pressure will begin filling back into the area later
Friday into the weekend behind the departing cold front. Elevated
probabilities for precipitation will linger behind frontal passage
as a sharpening upper level trough crosses the forecast area
Saturday. Ridging aloft will follow this feature and a weak high
pressure wedge-type pattern could set up near or just inland from
the area later Saturday into Sunday and persist into early next
week.

Aviation 12z Tuesday through Saturday
Kchs: perhaps a period of MVFR ceilings sneaking in from the n
during the mid and late morning, otherwiseVFR conditions will
dominate.

Ksav:VFR.

Extended aviation outlook: mainlyVFR conditions are expected, with
low probabilities for morning restrictions due to fog, mainly
Wednesday and Thursday.

Marine
Today and tonight: the large cyclonic pressure pattern
surrounding TC maria will prevail across the maritime community.

Since we're so far away to the W and sw, winds won't be a
problem, but elevated seas comprised mostly of large and long
period swells will persist. As a result we still have sca's in
effect for charleston county atlantic waters and the outer ga
waters, with significant wave heights as high as 6 ft within 20
nm, and up to 8 ft further offshore. However, as maria gains
some latitude, seas will slowly continue to subside this
afternoon and tonight, and the only SCA remaining by sunset
will be on the amz374 waters for 6 or 7 foot seas. The other
waters will have nothing more than 4 or 5 ft by that time.

Wednesday through Sunday: lingering 6 foot seas in the offshore
ga waters should drop below small craft advisory criteria by
mid-day Wednesday. Conditions will then remain rather tranquil
through late week with winds peaking 10-15 knots and seas
generally ranging 2-4 feet. NE winds will begin increasing early
Saturday in response to a tightening pressure gradient, peaking
around 20 knots with gusts to 25 knots, and seas increasing in
response. Small craft advisory conditions will be possible again
by Saturday afternoon and could persist into early next week.

Rip currents: there remains a solid 3 or 4 foot swell impacting
the beaches today, arriving around every 12 seconds. This is
more than enough to generate a moderate risk of rip currents.

With a strong pinching of winds and the resulting increase in
seas this weekend, another round of enhanced rip current risk
seems likely.

Tides coastal flooding
The probabilistic extra-tropical storm surge guidance indicates
about a 10% chance of tides reaching 7.0 ft mllw in charleston
harbor with the early afternoon high tide, while the GFS total
water guidance shows levels falling about 1 4 foot shy of the
requirement of a coastal flood advisory. Given the offshore
fetch and since we didn't quite get to 7.0 ft mllw yesterday,
we'll probably not get that high today. Still, we'll need to
closely monitor tidal trends as levels are still running around
1-1.5 ft mllw above predicted levels the past 18-24 hours.

Climate
Maximum temperature records for 28 september (degrees fahrenheit):
kchs... 94 1986.

Ksav... 98 1986.

Kcxm... 92 1986.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory until 4 pm edt Wednesday for amz374.

Small craft advisory until 5 pm edt this afternoon for amz350.

Near term...

short term... Jmc
long term... Jmc
aviation...

marine...

tides coastal flooding...

climate...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 19 mi49 min NNW 8 G 12 74°F 81°F1011 hPa
FBIS1 - Folly Island, SC 25 mi67 min NNW 7 G 12 73°F 1011.2 hPa (-0.0)69°F
ACXS1 - ACE Basin Reserve, SC 31 mi82 min WNW 1 70°F 1011 hPa68°F
41029 - Capers Nearshore (CAP 2) 32 mi119 min NNW 16 G 21 72°F 80°F1009.9 hPa
41033 48 mi59 min NNW 9.7 G 14 74°F 1016.5 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Summerville Airport, SC8 mi72 minNNW 310.00 miFair68°F68°F100%1011.8 hPa
Charleston, Charleston Air Force Base, SC10 mi71 minNNW 610.00 miA Few Clouds71°F69°F94%1010.9 hPa
Moncks Corner Berkeley County, SC18 mi72 minNNW 610.00 miFair72°F68°F88%1011.5 hPa
Charleston Executive Airport, SC21 mi72 minWNW 610.00 miFair72°F69°F94%1010.8 hPa
Mount Pleasant Regional-Faison Field, SC23 mi72 minNNW 510.00 miFair72°F69°F94%1010.8 hPa
Walterboro Lowcountry Regional Airport, SC24 mi72 minNW 310.00 miFair66°F64°F94%1012.2 hPa

Wind History from DYB (wind in knots)
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Last 24hrCalmN3N6N6N7N6NE5NE5NE6N4N5N4CalmN3N3CalmCalmCalmCalmN3NW3NW3N3NW3
1 day agoN3N3N6NE5NE5N5NE5N5N5N5N4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
2 days agoCalmCalmN4NE3NE3N6E3E3N4N4NE4CalmSE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for Bacon Bridge, Ashley River, South Carolina
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Bacon Bridge
Click for Map
Tue -- 03:11 AM EDT     1.98 feet High Tide
Tue -- 07:11 AM EDT     Sunrise
Tue -- 10:15 AM EDT     0.18 feet Low Tide
Tue -- 12:59 PM EDT     Moonrise
Tue -- 03:53 PM EDT     2.16 feet High Tide
Tue -- 07:11 PM EDT     Sunset
Tue -- 11:06 PM EDT     0.22 feet Low Tide
Tue -- 11:38 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.71.31.821.91.71.410.60.30.20.30.71.21.72.12.22.11.81.410.60.30.2

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Tue -- 12:36 AM EDT     -0.00 knots Slack
Tue -- 04:00 AM EDT     -1.58 knots Max Ebb
Tue -- 07:10 AM EDT     Sunrise
Tue -- 07:16 AM EDT     0.00 knots Slack
Tue -- 09:50 AM EDT     1.31 knots Max Flood
Tue -- 12:57 PM EDT     Moonrise
Tue -- 01:35 PM EDT     -0.00 knots Slack
Tue -- 04:58 PM EDT     -1.83 knots Max Ebb
Tue -- 07:10 PM EDT     Sunset
Tue -- 08:07 PM EDT     0.00 knots Slack
Tue -- 10:13 PM EDT     1.25 knots Max Flood
Tue -- 11:37 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.3-0.3-1-1.4-1.6-1.4-0.8-0.20.51.11.310.80.4-0.3-1.1-1.6-1.8-1.5-0.9-0.10.71.21.1

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.