Wednesday, January17, 2018 L-36.com


Marine Weather and Tides
Awendaw, 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 7:19AMSunset 5:39PM Wednesday January 17, 2018 12:08 AM EST (05:08 UTC) Moonrise 7:38AMMoonset 6:19PM Illumination 0% Phase: New Moon; Moon at 0 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- 948 Pm Est Tue Jan 16 2018
Tonight..Variable winds 5 kt or less.
Wed..NW winds 5 to 10 kt. A slight chance of rain in the afternoon.
Wed night..NW winds 10 to 15 kt.
Thu..NW winds 5 to 10 kt.
Thu night..W winds 5 kt.
Fri..SW winds 5 to 10 kt.
Fri night..W winds 5 kt.
Sat..SW winds 5 kt.
Sat night..SW winds 5 kt.
Sun..S winds 5 kt.
Sun night..SE winds 5 kt. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 46 degrees.
AMZ300 948 Pm Est Tue Jan 16 2018
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will move through the area Wednesday morning with some light wintry precipitation likely across inland areas. Cold, dry high pressure will then move in through late week. Moderating temperatures are expected this weekend into early next week before another cold front moves through Monday. Dry high pressure will then return on Tuesday.

7 Day Forecast for Marine Location Near Awendaw, SC
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location: 32.94, -79.68     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 170303
afdchs
area forecast discussion
national weather service charleston sc
1003 pm est Tue jan 16 2018

Synopsis
A cold front will move through the area Wednesday morning with
some light wintry precipitation likely across inland areas.

Cold, dry high pressure will then move in through late week.

Moderating temperatures are expected this weekend into early
next week before another cold front moves through Monday. Dry
high pressure will then return on Tuesday.

Near term until 6 am Wednesday morning
An arctic cold front producing snow across northern and western
ga will approach overnight, moving into the area toward morning.

The front is being driven by a deep mid and upper trough from
the eastern great lakes to the lower ms valley. Cirriform clouds
in advance of this feature and a coupling upper jet will
continue to increase and thicken, and this looks to hold the
vast majority of the area above freezing for the first time
since 4 nights ago. Lows on average will be in the mid and upper
30s, with no more than isolated cold pockets in parts of the
charleston tri-county area that will be closer to 32f.

All but a few hi-res models keep the forecast zones free of
precipitation tonight, but oftentimes the models are slow in
brining precipitation in, so will leave the 20% pop from
allendale to candler counties after 5 am. This will initially be
in liquid form, but some light snow and or sleet could occur
closer to daybreak as evaporative cooling develops.

Wet grounds due to the formation of dew, plus calm winds, could
support a little shallow ground fog in spots prior to the
thicker clouds moving in.

Short term 6 am Wednesday morning through Friday
A cold front will push through Wednesday morning, likely near the
coast around daybreak. Colder air will begin to move in after the
frontal passage while moisture will be increasing ahead of a strong
upper shortwave trough. There is high confidence that precipitation
amounts will be mainly a tenth of an inch or less, but the main
question remaining is how much cold air is in place while the
moisture is deepest and thus how much of the precipitation could be
frozen. The main change with the latest forecast was to increase
precipitation chances into the likely range toward the pee
dee midlands. Surface temperatures should be above freezing for all
areas to start the day, then likely fall to near freezing around mid-
morning around the csra, then likely be above freezing the rest of
the day for all areas. At this time we are not expecting more than a
coating dusting of snow on non-roadway surfaces, mainly well inland
closer to the pee dee midlands csra. Worst case snow accumulation
should be a tenth of an inch in these areas. Much colder air will
filter in Wednesday night with strong cold advection occurring.

Many areas will likely be in the lower 20s Thursday morning
with wind chills near 15 degrees. This could prompt wind chill
advisories close to the coast. Temperatures will remain below
normal through the rest of the period, although they will be on
a moderating trend. However, it will remain dry with high
pressure in control.

Long term Friday night through Tuesday
High pressure will prevail over the southeast united states this
weekend and early next week before a cold front arrives Monday. The
pattern will favor warming conditions each day under ridging aloft.

In general, afternoon highs will peak in the lower 60s on Saturday,
then upper 60s to around 70 degrees on Sunday. By Monday, southerly
winds will help advect deep moisture over the southeast and produce
some cloud cover ahead of the approaching front. This should limit
overall high temps to the upper 60s for most locations. Chances of
showers will arrive to most areas by Monday afternoon as the front
begins to shift over the region. Dry high pressure will then return
on Tuesday behind the departing cold front. Temps will be cooler,
but should remain at or just a few degrees above normal. In general,
afternoon temps should peak in the lower 60s.

Aviation 03z Wednesday through Sunday
Vfr conditions tonight into Wednesday morning. Lower ceilings
will develop in advance of and behind a cold front late in the
morning and into the afternoon, as winds shift to the NW and
increase. MVFR ceilings are certainly possible during this time,
but for now we have low-endVFR ceilings at both kchs and ksav.

At kchs there could be a little light rain as the front moves
through around 18-21z. A few snow flurries could also be
nearby, especially off to the NW of the terminal.

Extended aviation outlook: no significant concerns.

Marine
Quiet weather is expected to persist over the coastal waters
tonight. Weak high pressure will lose its influence as a cold
front approaches from the west. The pressure gradient will
remain fairly loose through the night, with E NE winds of no
more than 5 or 10 kt initially. Closer to daybreak, winds will
take on a more solid northwest direction at similar speeds as
the cold front approaches and land breeze influences develop.

Seas will be 2 to 3 feet within 20 nm of the shore, up to 5 ft
on the outer ga waters.

Wednesday through Sunday: winds seas will increase behind a cold
front pushing through Wednesday morning. We have raised an advisory
for the offshore waters starting Wednesday afternoon. The other
marine waters, particularly off charleston county, should reach
advisory levels Wednesday night. Conditions should improve fairly
quickly Thursday as the pressure gradient and cold advection wane,
with the offshore waters likely dropping below advisory levels in
the early afternoon. No other significant concerns thereafter
through the weekend.

Equipment
The kclx radar is out of service until further notice. Parts
have been ordered to replace the problems and should arrive on
Wednesday. Until the radar is back in operation use surrounding
radars; kltx, kcae, kjax, kvax and kjgx.

The downtown charleston observation site (chls1 cxm) will be
unavailable until further notice.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory from 1 pm Wednesday to 1 pm est Thursday
for amz374.

Near term...

short term... Rjb
long term... Dpb
aviation...

marine...

equipment...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
41029 - Capers Nearshore (CAP 2) 10 mi61 min NE 3.9 G 5.8 42°F 48°F1026.5 hPa
CHTS1 17 mi51 min Calm G 1 43°F 46°F1026.4 hPa
FBIS1 - Folly Island, SC 21 mi69 min NE 2.9 G 2.9 45°F 1027 hPa (-1.3)42°F
NIWS1 - North Inlet-Winyah Bay Reserve, SC 38 mi84 min Calm 35°F 1027 hPa34°F
41004 - EDISTO - 41 NM Southeast of Charleston, SC 43 mi39 min NNW 7.8 G 12 57°F 1026.7 hPa35°F
ACXS1 - ACE Basin Reserve, SC 49 mi84 min Calm 37°F 1027 hPa36°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mount Pleasant Regional-Faison Field, SC6 mi74 minN 010.00 miFair36°F33°F93%1027.1 hPa
Charleston, Charleston Air Force Base, SC19 mi73 minN 010.00 miPartly Cloudy40°F35°F83%1026.5 hPa
Charleston Executive Airport, SC24 mi74 minN 010.00 miFair37°F33°F87%1026.7 hPa

Wind History from LRO (wind in knots)
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Last 24hrCalmCalmCalmN3CalmCalmCalmCalmN3N4CalmCalmCalmS6SE5SE3CalmCalmCalmCalmCalmCalmCalmCalm
1 day agoN4N3CalmN5N4N8N4N4N5N7NW8NW9N6N6N3NW9NW7NW5CalmCalmCalmCalmCalmCalm
2 days agoN3N4N5N5N4N4N5N6N6N5N7N6NW8N6N5N6NE3E3NE3CalmCalmN3N4N4

Tide / Current Tables for Moores Landing, ICWW, Sewee Bay, South Carolina
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Moores Landing
Click for Map
Wed -- 01:51 AM EST     -0.19 feet Low Tide
Wed -- 07:21 AM EST     Sunrise
Wed -- 07:37 AM EST     Moonrise
Wed -- 08:21 AM EST     5.34 feet High Tide
Wed -- 02:29 PM EST     0.03 feet Low Tide
Wed -- 05:36 PM EST     Sunset
Wed -- 06:19 PM EST     Moonset
Wed -- 08:25 PM EST     4.45 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.1-0.20.31.42.844.85.35.24.53.42.10.90.10.10.923.144.44.43.82.8

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Wed -- 02:19 AM EST     0.00 knots Slack
Wed -- 04:52 AM EST     1.70 knots Max Flood
Wed -- 07:21 AM EST     Sunrise
Wed -- 07:38 AM EST     Moonrise
Wed -- 08:44 AM EST     -0.00 knots Slack
Wed -- 11:53 AM EST     -2.51 knots Max Ebb
Wed -- 02:58 PM EST     0.00 knots Slack
Wed -- 05:08 PM EST     1.60 knots Max Flood
Wed -- 05:38 PM EST     Sunset
Wed -- 06:20 PM EST     Moonset
Wed -- 08:39 PM EST     -0.00 knots Slack
Wed -- 11:54 PM EST     -2.09 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.9-1.2-0.30.71.51.71.51.30.7-0.3-1.4-2.2-2.5-2-1.101.11.61.410.5-0.3-1.2-1.9

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 (0,6,7,8)
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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.