Friday, August18, 2017 L-36.com


Marine Weather and Tides
James, 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 8:02PM Friday August 18, 2017 6:08 PM EDT (22:08 UTC) Moonrise 2:17AMMoonset 4:36PM Illumination 12% Phase: Waning Crescent; Moon at 26 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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AMZ256 Coastal Waters From Murrells Inlet To South Santee River Sc Out 20 Nm- 251 Pm Edt Fri Aug 18 2017
Tonight..SW winds 15 to 20 kt...diminishing to 10 to 15 kt late this evening and overnight. Seas 3 ft. A slight chance of showers and tstms.
Sat..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 ft. A chance of showers and tstms.
Sat night..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 ft. A chance of showers and tstms.
Sun..S winds 10 kt. Seas 3 ft...subsiding to 2 ft in the afternoon. A chance of showers and tstms.
Sun night..S winds 10 kt. Seas 2 ft. A chance of showers and tstms.
Mon..S winds 10 kt or less...increasing to 10 kt in the afternoon. Seas 2 ft.
Mon night..S winds 10 kt. Seas 2 ft. A chance of showers and tstms.
Tue..SW winds 10 kt. Seas 2 to 3 ft. A chance of showers and tstms through the night.
Wed..SW winds 10 to 15 kt. Seas 3 ft...then 2 to 4 ft. A chance of showers and tstms. Winds and seas higher in and near tstms.
AMZ200 251 Pm Edt Fri Aug 18 2017
Synopsis for coastal waters from surf city north carolina to south santee river south carolina out to 20 nautical miles.. A cold front will stall just inland a remain over land through the weekend. High pressure will return early next week.

7 Day Forecast for Marine Location Near James, SC
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location: 33.31, -79.68     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 182002
afdchs
area forecast discussion
national weather service charleston sc
402 pm edt Fri aug 18 2017

Synopsis
Atlantic high pressure will remain in control through early
next week. A cold front may affect the area during the middle
of next week.

Near term until 6 am Saturday morning
Until sunset: radar shows very limited convection across the
area. This is mainly due to drier air on satellite water vapor
imagery over our area. Models still hint at the potential for
some isolated convection for the next few hours and this seems
reasonable given SPC mesoscale analysis shows mlcapes ~2,000
j kg. We're keeping slight chance pops, but most areas can
expect to stay dry. The sea breeze is marching inland. Ahead of
the sea breeze, heat indices are spiking to ~110 degrees. These
are short spikes as they drop behind the sea breeze. Plus, peak
heating has past.

Tonight: dry conditions are expected across the land areas.

However, moisture convergence will allow for nocturnal
convection near the gulf stream, some possibly making it to the
charleston county coastline around daybreak. He have slight
chance pops here to account for this. It'll be another very warm
and muggy night, and record high minimum temps will be
challenged.

Short term 6 am Saturday morning through Monday
A broad upper ridge will remain across the southeast united
states through the weekend, maintaining hot and muggy
conditions. A decent mid-level cap and weak afternoon sea
breeze will only allow isolated afternoon showers and tstms to
develop. Slightly higher high temps will be inland while the
highest dewpoints will be closer to the coast. The result will
be heat index values topping out 103-107f both days.

On Monday, the broad 500 mb ridge will persist across the
southeast united states and into the western and central
atlantic. However, both the GFS and ECMWF now feature a weak
tropical wave (currently north of the bahamas) drifting slowly
wnw toward the area. There are no signs of tropical development
of this wave, though it is expected to spread increasing
atlantic moisture into the area Monday afternoon. This may yield
a modest increase in potential afternoon showers and tstms.

Additionally, sky cover may be somewhat greater Monday due to
greater mid and high level moisture. Highs will be in the lower
90s with heat indices 100-103f.

Long term Monday night through Friday
Very strong upper ridging will prevail into Tuesday before a trough
and cold front move in for the middle to latter portion of the week.

This will lead to increasingly unsettled weather toward mid week,
especially Thursday as the front moves into the area. Temperatures
should remain above normal through the period, except possibly
Thursday depending on the location of the front.

Aviation 20z Friday through Wednesday
Vfr.

Extended aviation outlook: main concern through Wednesday is
showers and thunderstorms, mainly each afternoon early evening.

Marine
Tonight: a decent packing of the gradient between the inland
trough and sub-tropical ridge, plus nocturnal low level jetting
will support s-sw winds as high as 15 or 20 kt and seas 3-4 ft.

The worst conditions will be beyond 10 nm out for the sc waters
and amz374.

Saturday through Wednesday: the coastal waters will remain
between an inland trough and offshore high pressure through
Saturday night which will keep a tighter than normal pressure
gradient in place. Winds could push 20 knots at times but this
is just below advisory levels. A weakening cold front will then
approach early next week but likely stall out and never make it
through the area with winds generally remaining 15 knots or
less. Seas will mostly be 4 feet or less, highest near the gulf
stream.

Tides coastal flooding
The combination of astronomical influences and moderate onshore
winds could produce shallow coastal flooding along parts of the
south carolina coast with this evening's high tide. A coastal
flood advisory might be needed if tidal departures continue to
increase.

Astronomical influences will lead to a round of elevated tides
into early next week. Only small tidal departures are necessary
and we could approach shallow coastal flooding levels with the
evening high tides, mainly Sunday through Tuesday along the sc
coast.

Climate
Record high minimums for 18 august...

kchs 78 2010
kcxm 82 1998
ksav 78 2010
record high minimums for 19 august...

kchs 79 2010
kcxm 81 2009
ksav 79 1878

Equipment
The temperature and dew point sensors at the downtown charleston
observation site (kcxm) could periodically fail. Technicians
are working to resolve the problem.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term...

short term...

long term...

aviation...

marine...

tides coastal flooding...

climate...

equipment...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NIWS1 - North Inlet-Winyah Bay Reserve, SC 26 mi143 min S 13 89°F 1012 hPa79°F
41029 - Capers Nearshore (CAP 2) 35 mi60 min SSW 14 G 19 85°F 87°F1012.6 hPa
CHTS1 39 mi50 min S 11 G 15 89°F 87°F1013.3 hPa
FBIS1 - Folly Island, SC 45 mi68 min SSW 14 G 16 87°F 1013.8 hPa (-1.3)80°F
MROS1 - 8661070 - Springmaid Pier, SC 47 mi50 min 1011.9 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Georgetown County Airport , SC19 mi73 minSSW 910.00 miPartly Cloudy90°F80°F75%1012.9 hPa
Moncks Corner Berkeley County, SC21 mi73 minSW 510.00 miFair93°F71°F50%1012.5 hPa

Wind History from GGE (wind in knots)
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Last 24hrCalmCalmCalmCalmS3CalmCalmCalmSW6SW6S5SW5W6SW4W9W4W7W6SW8SW10W5W8S8S7
1 day agoS4CalmCalmS5CalmCalmCalmCalmCalmSW3CalmCalmCalmCalmCalmCalmCalmW3W4SW4S12SW7SW6SW4
2 days agoW7W4CalmS4SW3SW4SW3W3W4SW3W5CalmCalmCalmW3NW4W3NW3CalmCalmW5SE4SE8E7

Tide / Current Tables for Jamestown Bridge, Santee River, South Carolina
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Jamestown Bridge
Click for Map
Fri -- 03:17 AM EDT     Moonrise
Fri -- 05:58 AM EDT     0.18 feet Low Tide
Fri -- 06:43 AM EDT     Sunrise
Fri -- 09:47 AM EDT     1.15 feet High Tide
Fri -- 05:36 PM EDT     Moonset
Fri -- 06:09 PM EDT     -0.05 feet Low Tide
Fri -- 08:00 PM EDT     Sunset
Fri -- 10:23 PM EDT     1.43 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.90.70.50.30.20.20.40.81.11.21.110.80.60.40.20-0.10.10.61.11.41.4

Tide / Current Tables for Pleasant Hill Landing, Santee River, South Carolina
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Pleasant Hill Landing
Click for Map
Fri -- 03:16 AM EDT     Moonrise
Fri -- 03:20 AM EDT     0.42 feet Low Tide
Fri -- 06:43 AM EDT     Sunrise
Fri -- 07:56 AM EDT     2.31 feet High Tide
Fri -- 03:31 PM EDT     -0.12 feet Low Tide
Fri -- 05:35 PM EDT     Moonset
Fri -- 07:59 PM EDT     Sunset
Fri -- 08:32 PM EDT     2.87 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.40.90.60.40.511.72.12.32.21.91.510.60.2-0.1-00.61.52.32.82.82.62.3

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 (18,4,5,8)
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Ground Weather Radar Station Wilmington, NC
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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.