Thursday, August17, 2017 L-36.com


Marine Weather and Tides
North 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 6:44AMSunset 8:03PM Thursday August 17, 2017 1:47 AM EDT (05:47 UTC) Moonrise 1:22AMMoonset 3:37PM Illumination 26% Phase: Waning Crescent; Moon at 25 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- 1240 Am Edt Thu Aug 17 2017
Tonight..SW winds 5 kt.
Thu..SW winds around 5 kt, becoming S 5 to 10 kt in the afternoon. A slight chance of showers and tstms in the morning, then a chance of showers and tstms in the afternoon.
Thu night..SW winds 5 to 10 kt. A slight chance of showers and tstms.
Fri..SW winds 5 to 10 kt. A chance of showers and tstms.
Fri night..SW winds 10 kt. A chance of showers and tstms.
Sat..SW winds 10 to 15 kt. A chance of showers and tstms.
Sat night..SW winds 10 to 15 kt. A chance of showers and tstms.
Sun..SW winds 10 kt. A chance of showers and tstms.
Sun night..S winds 5 to 10 kt. A chance of showers and tstms.
Mon..S winds 5 to 10 kt. A chance of showers and tstms.
Mon night..S 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 86 degrees.
AMZ300 1240 Am Edt Thu Aug 17 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure will remain in control as troughing persists inland through late this week. A cold front will approach this weekend, likely falling apart early next week as high pressure returns.

7 Day Forecast for Marine Location Near North Charleston, SC
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location: 32.85, -80.05     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 170453
afdchs
area forecast discussion
national weather service charleston sc
1253 am edt Thu aug 17 2017

Synopsis
Atlantic high pressure will remain in control as troughing
persists inland through late this week. A cold front will
approach this weekend, likely falling apart early next week as
high pressure returns.

Near term through today
Mainly clear skies with warm and muggy conditions persisting with
lows 77 to 80 degrees most locales, generally warmest near the
coast. An isolated late night shower or TSTM could pop up with
the land breeze along the upper charleston county coast, where
we have some silent pops for this area.

Short term tonight through Saturday
Thursday: a ridge axis will stretch from the northeastern states
into the mid-atlantic states. Aloft, broad high pressure is
forecasted to hover over the deep south. At the surface, a weak low
should form over the midlands in the afternoon while troughing
persists further inland. Deep moisture is in place with pwats
getting up to 2.3". This is 1-2 standard deviations for this time of
year. Models indicate good instability in place by the afternoon
with GFS blcapes approaching 2,000 j kg, a showalter index nearing -
4, and decent lapse rates. Even with some subsidence aloft from the
aforementioned high, showers and thunderstorms are expected to
develop in the afternoon. Dcapes should exceed 500 j kg, so some of
the stronger storms could produce gusty winds in additional to
locally heavy rainfall. Temperatures will be in the low to mid 90s
with heat indices as high as 106-108 degrees. Not quite enough for a
heat advisory, but certainly making for unbearable uncomfortable
outdoor conditions before the convection begins. The convection
should dissipate into the evening as the atmosphere stabilizes, but
more convection is expected to develop over the coastal waters. It
will be a very warm night with lows in the mid to upper 70s.

Friday and Saturday: the ridge axis shifts offshore Friday as
troughing builds from the great lakes region into the tn valley by
Saturday. A the same time, the broad high pressure over the deep
south will retreat to tx. At the surface, troughing is expected to
persist inland. A cold front is also expected to approach from the
northwest on Saturday. Deep moisture remains in place with pwats
above 2.0", perhaps getting up to 2.3" at times. Instability
increases each of the two days along with lift from the approaching
front and the sea breeze. Showers and thunderstorms are expected,
some being enhance by cold pool boundaries. The overall severe risk
is low, but the strongest storms could produce damaging winds. Heavy
rain is also a threat, but maybe less so on Saturday as steering
level winds start to increase. Highs will be several degrees above
normal.

Long term Saturday night through Wednesday
A cold front upstream will attempt to approach but will likely fall
apart as it runs into a strong blocking ridge both surface and
aloft. The typical instability along with sufficient moisture and
meso-scale boundary interactions will support a chance of mainly
diurnally driven convection each day through the extended period,
including Monday the day of the total solar eclipse. Above average
heights, 925 and 850 mb temps and low level thickness will allow for
a continuation of above normal highs and lows.

Aviation 06z Thursday through Monday
MainlyVFR outside isolated to scattered showers thunderstorms,
mainly this afternoon and early evening. The potential appears
slightly better at kchs than at ksav at this time.

Extended aviation outlook: temporary flight restrictions can occur
in scattered diurnal convection through early next week.

Marine
Overnight: south to southwest winds will become uniformly
southwest overnight. Speeds will remain 15 kt or less with seas
2-3 ft.

Thursday through Saturday: the coastal waters will lie in a general
sw'erly flow along the fringes of atlantic high pressure, as a
piedmont trough persists inland over the se. While afternoon sea
breeze influences and nocturnal low level jetting will give a boost
to winds, speeds on average will be no more than 15-18 kt. Seas will
hold at or below 3 or 4 ft. Expect isolated to scattered showers and
t-storms through the entire period.

Sunday through Monday: a cold front upstream will never reach the
waters as high pressure holds firm, keeping winds and seas below any
sca conditions. Isolated to scattered showers and t-storms will
again prevail.

Climate
Record high minimums for 16 august...

kchs 78 2010
kcxm 83 2016
ksav 78 1942
record high minimums for 17 august...

kchs 78 2010
kcxm 82 2010
ksav 78 1995
record high minimums for 18 august...

kchs 78 2010
kcxm 82 1998
ksav 78 2010

Equipment
The temperature sensor at the downtown charleston observation
site (kcxm) has failed. Technicians are working to resolve the
problem. Temperature and dewpoint data will not be available
until the sensor is replaced.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term...

short term...

long term...

aviation...

marine...

climate...

equipment...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 8 mi47 min SW 4.1 G 7 84°F 86°F1016.9 hPa (+0.3)
FBIS1 - Folly Island, SC 14 mi47 min SW 7 G 8.9 85°F 1017.3 hPa (+0.0)79°F
41029 - Capers Nearshore (CAP 2) 23 mi39 min WSW 12 G 16 83°F 85°F1016.5 hPa
ACXS1 - ACE Basin Reserve, SC 29 mi62 min Calm 82°F 1017 hPa80°F
41033 44 mi39 min SW 14 G 18 85°F 1016.4 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston, Charleston Air Force Base, SC4 mi1.9 hrsWSW 510.00 miFair83°F79°F88%1016.5 hPa
Charleston Executive Airport, SC11 mi52 minN 010.00 miMostly Cloudy84°F80°F89%1016.9 hPa
Mount Pleasant Regional-Faison Field, SC15 mi52 minN 05.00 miFog/Mist79°F78°F100%1016.9 hPa
Summerville Airport, SC19 mi52 minN 010.00 miFair79°F77°F94%1016.9 hPa
Moncks Corner Berkeley County, SC23 mi72 minN 07.00 miFair77°F77°F100%1016.6 hPa

Wind History from CHS (wind in knots)
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Last 24hrW5W6W7W9W7W6W7NW7NW5NW6NW9NW7W8W9W6SW5W8SW11SW7S6S8SW5SW5SW5
1 day agoW6S6CalmW3W4CalmW5W3W7W6W765SW8W9W8W7W6SW5SW6SW6W5SW6W4
2 days agoS7S6CalmCalmCalmCalmW3W4W63SW8S10SE7S10S4CalmS7S4SW4W4S4SW4CalmSW3

Tide / Current Tables for Drayton, Bee's Ferry, Ashley River, South Carolina
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Drayton
Click for Map
Thu -- 02:22 AM EDT     Moonrise
Thu -- 04:52 AM EDT     5.68 feet High Tide
Thu -- 06:45 AM EDT     Sunrise
Thu -- 11:07 AM EDT     -0.26 feet Low Tide
Thu -- 04:37 PM EDT     Moonset
Thu -- 05:32 PM EDT     6.87 feet High Tide
Thu -- 08:02 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
12.13.54.75.55.75.34.331.50.3-0.30.11.43.14.96.16.86.86.253.520.8

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Thu -- 01:05 AM EDT     1.46 knots Max Flood
Thu -- 02:21 AM EDT     Moonrise
Thu -- 04:38 AM EDT     -0.00 knots Slack
Thu -- 06:44 AM EDT     Sunrise
Thu -- 08:09 AM EDT     -2.33 knots Max Ebb
Thu -- 11:06 AM EDT     0.00 knots Slack
Thu -- 01:35 PM EDT     1.89 knots Max Flood
Thu -- 04:36 PM EDT     Moonset
Thu -- 05:34 PM EDT     -0.00 knots Slack
Thu -- 08:01 PM EDT     Sunset
Thu -- 08:53 PM EDT     -2.66 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
11.51.20.80.4-0.3-1.2-1.9-2.3-2.1-1.2-0.111.81.81.51.20.6-0.5-1.5-2.4-2.7-2.2-1.2

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 (1,6,7,8)
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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.