Thursday, October19, 2017 L-36.com


Marine Weather and Tides
Mount Pleasant, 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 7:26AMSunset 6:42PM Thursday October 19, 2017 5:21 AM EDT (09:21 UTC) Moonrise 6:08AMMoonset 6:00PM Illumination 1% Phase: Waning Crescent; Moon at 29 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- 323 Am Edt Thu Oct 19 2017
Today..NE winds 10 kt.
Tonight..NE winds 5 to 10 kt.
Fri..NE winds 5 to 10 kt.
Fri night..E winds 10 kt.
Sat..E winds 10 to 15 kt.
Sat night..E winds 10 to 15 kt.
Sun..E winds 10 to 15 kt. A slight chance of showers and tstms.
Sun night..SE winds 10 to 15 kt. A chance of showers with a slight chance of tstms.
Mon..SE winds 10 to 15 kt. A chance of showers and tstms.
Mon night..S winds 10 to 15 kt. A chance of showers with a slight chance of 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 74 degrees.
AMZ300 323 Am Edt Thu Oct 19 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Strong high pressure will build over the area through Saturday, then shift off the coast. A cold front will move through the area on Tuesday.

7 Day Forecast for Marine Location Near Mount Pleasant, SC
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location: 32.93, -79.83     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 190739
afdchs
area forecast discussion
national weather service charleston sc
339 am edt Thu oct 19 2017

Synopsis
Strong high pressure will build over the area through Saturday,
then shift off the coast. A cold front will move through the
area on Tuesday.

Near term through tonight
As of 340 am: a weak h5 trough will ripple over the CWA late
this afternoon and this evening. During the overnight hours, the
center of 590 dm ridge will drift east over the deep south, the
ridge axis north over the southern appalachians. At the sfc,
high pressure is expected to remain centered over the western
carolinas, building slightly east. The air mass will remain
dry, pw around .70 today decreasing to less than .5 tonight. I
will forecast clear to mostly clear through today and tonight.

In fact, any cloud cover and mentionable pops will remain over
the marine areas. Using a blend of temperature guidance, high
temperatures are forecast to range around 80 degrees this
afternoon and cooling into the 50s tonight.

Short term Friday through Sunday
A deep layered ridge will remain over the southeast united
states Friday into Saturday before shifting off the coast on
Sunday. As the surface high shifts off the coast late Saturday
through Sunday, onshore flow will develop and low-level
dewpoints will rise into the 60s. A weak coastal trough
developing over the georgia waters may produce isolated showers,
potentially shifting into coastal georgia Saturday night. A weak
shortwave approaching the area from the west, combined with
deepening moisture, may produce scattered showers or an isolated
thunderstorm on Sunday. High temps are expected to reach the low
to mid 80s each day, highest far southwest.

Long term Sunday night through Wednesday
A potent upper low will affect the area Monday into Tuesday,
pushing a cold front through the area late Tuesday. Good chance
for showers and tstms along and ahead of the cold front,
followed by drying and eventually cooler temps as high pressure
builds from the west and north.

Aviation 08z Thursday through Monday
Vfr.

Extended aviation outlook:VFR conditions are expected at both
chs and sav terminals through this weekend.

Marine
Today and tonight: winds and seas will remain elevated into this
afternoon given a continued pressure gradient across the local
waters, 2-3 mb spread from near the santee river and the altamaha
river. In addition, forecast sounding over buoy 41004 indicates very
shallow mixing today. The pressure gradient will begin to relax over
the coastal waters during the mid and late afternoon while high
pressure builds east. As a result, northeast winds between 20-25 kts
will gradually weaken to 15-20 kt late today into tonight. Seas of 4-
7 ft in nearshore waters and 6-8 ft in offshore georgia waters will
also slowly subside. Winds seas should drop below small craft
advisory levels this afternoon in nearshore waters, lingering across
the offshore georgia waters.

Moderate NE winds will persist through the weekend before
shifting to E and eventually SE early next week as the surface
high pressure system pushes off the mid-atlantic coast. Seas
should drop below 6 ft over the offshore ga waters late fri
afternoon, but will likely build back above 6 ft Sunday through
early to mid next week due to increasing fetch.

Rip currents... Steady northeast winds, long period swell from the
northeast east, and new moon influences will support an elevated risk
of rip currents through late this week. A moderate risk of rip
currents will continue for all beaches today.

Tides coastal flooding
New moon occurs today and base tides are expected to increase by 0.1
to 0.2 feet from yesterday. Given expected steady NE winds, peaking
astronomical forces, and existence of long period swells it appears
that the sc coast may see shallow coastal flooding during this
morning's high tide. Fort pulaski will be close, with guidance
supporting a crest above flood stage. However, given recent trends
of high tide levels at fpkg1 and changes in base tide it appears
this morning's high tide will crest around 9.1 ft, it will be
watched. Coast flood advisory will be issued for the sc coast until
10 am this morning.

The risk for minor high tide coastal flooding may remain
through Saturday. Coastal flood advisories will likely be
needed.

Chs watches warnings advisories
Ga... None.

Sc... Coastal flood advisory from 7 am to 10 am edt this morning for
scz048>050.

Marine... Small craft advisory until 2 pm edt this afternoon for amz352-
354.

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

Small craft advisory until 6 pm edt Friday for amz374.

Near term... Ned
short term... Jrl
long term... Jrl
aviation... Jrl ned
marine... Jrl ned
tides coastal flooding... Ned jrl


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 11 mi51 min N 8.9 G 14 65°F 74°F1022.9 hPa
41029 - Capers Nearshore (CAP 2) 14 mi73 min NNE 16 G 21 63°F 74°F1022.2 hPa
FBIS1 - Folly Island, SC 17 mi81 min N 9.9 G 13 65°F 1023.3 hPa (-1.1)55°F
ACXS1 - ACE Basin Reserve, SC 42 mi96 min NNE 1.9 60°F 1023 hPa55°F
NIWS1 - North Inlet-Winyah Bay Reserve, SC 45 mi96 min N 6 59°F 1024 hPa54°F
41004 - EDISTO - 41 NM Southeast of Charleston, SC 49 mi41 min NNE 19 G 25 74°F 79°F1020.9 hPa69°F

Wind History for Charleston, SC
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N11
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G24
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G22

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mount Pleasant Regional-Faison Field, SC3 mi46 minNNE 510.00 miFair57°F53°F88%1023.4 hPa
Charleston, Charleston Air Force Base, SC11 mi85 minNNE 510.00 miFair57°F53°F87%1023.2 hPa
Charleston Executive Airport, SC18 mi26 minN 510.00 miFair61°F55°F83%1023 hPa
Moncks Corner Berkeley County, SC21 mi26 minNE 57.00 miFair57°F48°F72%1023.7 hPa

Wind History from CHS (wind in knots)
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Last 24hrNE8NE8NE9NE11NE9N10NE10NE9NE8NE12NE6NE8NE10N6NE6NE4N6NE5N5NE5N6N5N5NE6
1 day agoNE11NE12N11NE12NE14
G18
NE12N13NE12NE16NE13NE14NE11NE14NE5NE4NE4NE5NE6N6NE7NE8NE8NE9NE10
2 days agoNW3CalmW3W5W56NW8W9W10N19
G25
NE7N10
G19
N16N10
G23
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G27
NE15
G24
N12
G20
NE11N11N13NE8N11NE10NE11

Tide / Current Tables for Cainhoy, Wando River, South Carolina
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Cainhoy
Click for Map
Thu -- 02:36 AM EDT     0.14 feet Low Tide
Thu -- 07:08 AM EDT     Moonrise
Thu -- 07:26 AM EDT     Sunrise
Thu -- 09:15 AM EDT     7.53 feet High Tide
Thu -- 03:01 PM EDT     0.19 feet Low Tide
Thu -- 03:12 PM EDT     New Moon
Thu -- 06:41 PM EDT     Sunset
Thu -- 06:59 PM EDT     Moonset
Thu -- 09:27 PM EDT     7.03 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.31.60.40.21.12.54.25.76.97.57.36.14.42.40.80.20.723.55.16.36.96.96

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Thu -- 02:39 AM EDT     0.00 knots Slack
Thu -- 04:59 AM EDT     1.70 knots Max Flood
Thu -- 07:08 AM EDT     Moonrise
Thu -- 07:26 AM EDT     Sunrise
Thu -- 08:57 AM EDT     -0.00 knots Slack
Thu -- 12:04 PM EDT     -2.82 knots Max Ebb
Thu -- 03:04 PM EDT     0.00 knots Slack
Thu -- 03:12 PM EDT     New Moon
Thu -- 05:11 PM EDT     1.68 knots Max Flood
Thu -- 06:41 PM EDT     Sunset
Thu -- 07:00 PM EDT     Moonset
Thu -- 09:03 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2.6-1.9-0.80.41.41.71.61.51-0-1.2-2.3-2.8-2.4-1.4-0.11.11.71.61.30.90.1-1-1.9

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 (5,6,7,8)
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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.