Monday, September25, 2017 L-36.com


Marine Weather and Tides
Charleston, 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 7:09AMSunset 7:12PM Monday September 25, 2017 2:57 PM EDT (18:57 UTC) Moonrise 11:06AMMoonset 9:55PM Illumination 26% Phase: Waxing Crescent; Moon at 5 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- 151 Pm Edt Mon Sep 25 2017
This afternoon..N winds 10 kt. Waves 1 to 2 ft near the harbor entrance.
Tonight..N winds 5 to 10 kt.
Tue..N winds 10 kt.
Tue night..NW winds 5 kt.
Wed..NW winds 5 to 10 kt.
Wed night..W winds 5 kt.
Thu..W winds 5 kt.
Thu night..SW winds 5 kt.
Fri..NE winds 5 kt. A slight chance of showers and tstms.
Fri night..E winds 5 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 80 degrees.
AMZ300 151 Pm Edt Mon Sep 25 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 then will turn northeast and will move away from the coast. A cold front will move through the area from the northwest late this week, followed by high pressure that will build into the region through next weekend.

7 Day Forecast for Marine Location Near Charleston, SC
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location: 32.78, -79.93     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 251758
afdchs
area forecast discussion
national weather service charleston sc
158 pm edt Mon sep 25 2017

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

Coast through midweek then will turn northeast and will move
away from the coast. A cold front will move through the area
from the northwest late this week, followed by high pressure
that will build into the region through next weekend.

Near term through tonight
Early this afternoon: conditions remain quiet with clear skies
across most of the forecast area. Locations across the tri-
county region continue to see plenty of mid high level clouds
associated with hurricane maria stream in, as well as some
stratocumulus in the low levels. The forecast remains dry, and
temperatures are on track.

Tonight: maria will pass well of the coast, reaching near the
latitude to the distant east of the santee river by Tuesday at
sunrise. There is still some outflow of cirrus overhead, but
soundings and cross- sections indicate that the coverage of
these clouds will be less than last night and during today. Some
of the MOS guidance supports late night stratus, but the sref
probabilities are minimal enough where we don't have any mention
of fog at this time. Most places will experience rapid
decoupling of low level winds in the evening, allowing for
adequate radiational cooling to support lows 66-71f inland from
us-17, 72-73f in downtown charleston, near lake moultrie and
along many coastal sections.

Short term Tuesday through Thursday
Models are in good agreement that precipitation chances will
generally remain very low through mid-week under sufficient
subsidence as maria passes the area offshore. Some isolated shower
or thunderstorm activity cannot be entirely ruled out Tuesday over
the coastal waters or even near coastal sc, but probabilities look
exceedingly low at this time, supported by GFS ensemble mean qpf
values of essentially 0 inches through at least 18z Wednesday.

A warming trend with above normal temperatures will persist, with
highs in the mid to upper 80s Tuesday, but most locations reaching
lower 90s Wednesday and Thursday. Low temperatures will range from
the upper 60s to lower 70s through the period.

Long term Thursday night through Sunday
Chances for showers thunderstorms will begin increasing late
Thursday into the weekend due to an approaching cold front. Guidance
continues to suggest that the front will complete passage through
the forecast area likely by late Friday or early Saturday. Cooler
high pressure will then begin filling in behind the front, with
early guidance suggesting a high pressure wedge-type pattern could
set up near or over the area Saturday into Sunday.

Aviation 18z Monday through Saturday
The main forecast issue for this forecast cycle is the potential
for stratus development late tonight. Model consensus shows
increasing likelihood of at least MVFR ceilings across the south
carolina zones, including kchs. Confidence is higher given that
a large area of stratus has persisted much of the day across
eastern north carolina and the south carolina counties north of
the santee river. Introduced MVFR ceilings starting at 10z at
kchs, and once they settle in they should linger through at
least mid morning. There is the potential for ceilings to lower
to ifr, but confidence isn't high enough in this scenario yet.

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

Marine
Today: the ongoing small craft advisories for all waters will
remain in effect, as large seas (mainly in the form of e-se
swells) continues to occur due to hurricane maria far to the e.

Both the nwps and the wna wave guidance is a tad high this
morning, so slight modifications have been made. But even so,
with some wind waves mixed in due to n-ne winds of 13-18 kt and
gusty, seas will reach as high as 7 to 9 ft within 20 nm of the
entire coast, and 10 or 11 ft on the outer ga waters. Winds in
charleston harbor will be closer to 10 or 12 kt, but some of
that swell energy will impact the harbor entrance, with waves up
to 2 ft to occur.

Tonight: as the hurricane continues her northward movement,
winds and seas will slowly start to come down, enough so where
the small craft advisory on the amz354 waters will drop off late
tonight. But seas will still be elevated on the other atlantic
waters outside the charleston harbor, where small craft
advisories will remain in effect.

Tuesday through Friday: a prolonged period of small craft advisories
will continue due to high seas pushing into the waters from offshore
hurricane maria. Generally northerly winds will gradually back nw
Tuesday while slowly diminishing to 10-15 knots with some gusts to
near 20 knots. Latest guidance suggests seas will remain above small
craft advisory criteria through Wednesday afternoon or evening, but
relatively benign sea conditions are anticipated Thursday into
Friday, with winds generally 5-10 knots and seas 2-4 ft. A cold
front followed by strong high pressure to the north will lead to
an enhanced onshore gradient Saturday, and winds and seas could
again be high enough where sca's are once again necessary.

Rip currents: with large and powerful long period swells from
hurricane maria to occur, a high risk for life-threatening rip
currents will persist. No one should enter the surf due to
these extremely dangerous conditions. An elevated risk will
persist through at least mid week due to continued long period
swells from maria.

Tides coastal flooding
Powerful e-se swells originating from hurricane maria will
continue to impact the coast today, with the larger breakers
along the sc coast, where a high surf advisory remains in effect
for 5 or 6 foot breakers. While a few breakers of 5 feet can
reach the ga beaches, the majority of them will be of less
height, so no high surf advisory is required. The large surf
along with tides remaining well above normal will continue to
produce significant wave run-up, causing additional erosion
around the times of high tide today and continuing through early
this week.

Tuesday's early afternoon high tide could approach shallow
coastal flooding criteria along the south carolina coast.

Chs watches warnings advisories
Ga... High risk for rip currents until 8 pm edt this evening for gaz117-
119-139-141.

Sc... High risk for rip currents until 8 pm edt this evening for
scz048>051.

High surf advisory until 8 pm edt this evening for scz048>051.

Marine... Small craft advisory until 8 pm edt Tuesday for amz352.

Small craft advisory until 4 pm edt Wednesday for amz350-374.

Small craft advisory until 5 am edt Tuesday for amz354.

Near term... Bsh
short term... Jmc
long term... Jmc
aviation... Bsh jmc
marine... Jmc
tides coastal flooding...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 0 mi39 min NNW 4.1 G 8 83°F 81°F1012.4 hPa
FBIS1 - Folly Island, SC 7 mi57 min NNE 2.9 G 4.1 79°F 1013.1 hPa (-0.5)69°F
41029 - Capers Nearshore (CAP 2) 16 mi49 min NE 12 G 18 74°F 80°F1012.1 hPa
ACXS1 - ACE Basin Reserve, SC 32 mi72 min N 2.9 83°F 1013 hPa67°F
41033 43 mi49 min N 9.7 G 12 78°F 1018.6 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 48 mi37 min N 19 G 23 76°F 82°F1010.6 hPa72°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC7 mi62 minN 710.00 miMostly Cloudy82°F71°F70%1012.5 hPa
Charleston, Charleston Air Force Base, SC10 mi2 hrsE 510.00 miMostly Cloudy81°F69°F67%1012.9 hPa
Mount Pleasant Regional-Faison Field, SC11 mi82 minN 510.00 miFair81°F69°F70%1012.9 hPa

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Last 24hrNE7N7NE7NE6N4NE4NE4N4NE4N5N5N4N5N7NE9N7N6N7N8N11N7NE8E5NE5
1 day agoSE14SE7E9E11E7E5E4E4NE4NE4NE4NE5NE4NE5N7N7NE7N7NE9N11NE11NE10NE10NE7
2 days agoNE8NE11SE10SE6SE6SE4CalmNE3NE3CalmCalmN4N3N3N4N4NE5N5NE5NE9NE8NE10E9SE10

Tide / Current Tables for Charleston, South Carolina
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Charleston
Click for Map
Mon -- 05:53 AM EDT     0.86 feet Low Tide
Mon -- 07:09 AM EDT     Sunrise
Mon -- 12:05 PM EDT     Moonrise
Mon -- 12:22 PM EDT     5.72 feet High Tide
Mon -- 06:30 PM EDT     1.20 feet Low Tide
Mon -- 07:11 PM EDT     Sunset
Mon -- 10:55 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.34.942.91.91.10.91.32.33.54.55.35.75.6542.91.91.31.31.933.94.7

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Mon -- 03:22 AM EDT     -1.79 knots Max Ebb
Mon -- 06:31 AM EDT     0.00 knots Slack
Mon -- 07:09 AM EDT     Sunrise
Mon -- 09:01 AM EDT     1.42 knots Max Flood
Mon -- 12:05 PM EDT     Moonrise
Mon -- 12:49 PM EDT     -0.00 knots Slack
Mon -- 04:09 PM EDT     -2.00 knots Max Ebb
Mon -- 07:11 PM EDT     Sunset
Mon -- 07:15 PM EDT     0.00 knots Slack
Mon -- 09:23 PM EDT     1.36 knots Max Flood
Mon -- 10:54 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0-0.8-1.4-1.8-1.7-1.2-0.40.41.11.41.20.90.6-0.1-1-1.7-2-1.8-1.1-0.20.71.31.20.8

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 (14,3,4,5)
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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.