Friday, July21, 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 6:25AMSunset 8:26PM Friday July 21, 2017 6:48 PM EDT (22:48 UTC) Moonrise 3:33AMMoonset 5:51PM Illumination 3% Phase: Waning Crescent; Moon at 28 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- 542 Pm Edt Fri Jul 21 2017
Tonight..S winds 5 to 10 kt, becoming sw 5 kt.
Sat..SW winds 5 kt, becoming S in the afternoon. A slight chance of showers and tstms in the afternoon.
Sat night..SW winds 10 kt. A slight chance of showers and tstms in the evening.
Sun..SW winds 10 to 15 kt. A slight chance of tstms. A slight chance of showers.
Sun night..SW winds 10 to 15 kt. A slight chance of showers and tstms.
Mon..SW winds 10 to 15 kt. A slight chance of showers and tstms in the morning, then a chance of showers and tstms in the afternoon.
Mon night..SW winds 15 kt, diminishing to 5 to 10 kt after midnight. A chance of showers and tstms.
Tue..SW winds 5 to 10 kt. A chance of showers and tstms.
Tue night..SW winds 5 to 10 kt. A chance of showers and tstms.
Wed..S winds 5 kt. A chance of showers and tstms.
Wed night..SE winds around 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 86 degrees.
AMZ300 542 Pm Edt Fri Jul 21 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure will extend west into the southeast coast through this weekend as broad low pressure remains inland. A weak cold front will approach the area during the middle of next week. A low pressure system may develop over the carolinas during the late work week.

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 212212
afdchs
area forecast discussion
national weather service charleston sc
612 pm edt Fri jul 21 2017

Synopsis
Atlantic high pressure will extend west into the southeast
coast through this weekend as broad low pressure remains
inland. A weak cold front will approach the area during the
middle of next week. A low pressure system may develop over the
carolinas during the late work week.

Near term until 6 am Saturday morning
Quick update has been issued to increase pops next 1-2 hours
in the reidsville-claxton corridor. Also adjusted hourly
temperatures dewpoints per current trends and lowered wind
speeds inland to calm as boundary layer decoupling is expected.

Clouds will continue to steadily diminish from east to west as
the sea breeze pushes farther inland. Debris high cloudiness
will steadily thin with time. Skies will be mostly clear
overnight with lows mid 70s inland to around 80 the beaches

Short term 6 am Saturday morning through Monday
Saturday: the mid level pattern over the region will feature a
broad weakness, with a large ridge centered over the atlantic
and another ridge centered over the mid mississippi river
valley. At the sfc, a trough should develop by Saturday
afternoon across piedmont of the carolinas. Sfc winds across the
region are forecast to range from SW inland to from the south
near the coast. High temperatures are forecast to range in the
mid 90s inland to near 90 over the beaches. Given the
temperature and wind forecast, a sea breeze should develop
during the mid to late afternoon, but should slowly move inland.

The sea breeze should support a line of CU and isolated deep
convection. Forecast soundings indicate that the LFC may range
between 4.5-5 kft. I will keep the pops schc and will delay
mentionable values until 20z.

Sunday: the pattern will generally remain the same from
Saturday. However, low pressure is expected to develop across
the mid atlantic states, with the trough remaining across the
piedmont. The pressure gradient across the forecast area will
slowly steepen through the day, with gusts expected across the
marine zones and near the coast. A slight increase in llvl
moisture convergence should support scattered thunderstorms
inland, with slight chcs generally east of i- 95.

Monday: using a blend of temperature guidance, high temperatures
are forecast to range a degree or two below values reached sat
and sun. Dewpoints are expected to remain in the low to mid 70s
as the region remains on the east side of the sfc trough. Given
the temps and dewpoints, any CIN should erode during the late
afternoon hours. Short range guidance indicates that a weak
short wave is expected to ripple across the forecast area during
the late afternoon. Pops should range from 40 percent over ga
and around 30 near the coast and coastal waters.

Long term Monday night through Friday
A more active unsettled weather pattern is expected next week as a
southwest sfc flow advects deep moisture to the region ahead of a
cold front that approaches from the north northwest. The cold front
should struggle to push south of the region, likely stalling over or
near the area as its parent mid upper lvl trough of low pressure
shifts off the northeast coast. The setup will favor at least
chances of showers and thunderstorms each day with greatest coverage
expected over the area on Wednesday near the stalling front. Weak
low pressure should then persist along the stalled front into late
week, supporting afternoon showers and thunderstorms into next
weekend. High temps will generally be near normal during the week,
peaking near 90 degrees away from the coast. Overnight lows will
remain mild under extensive cloud cover, ranging in the low to mid
70s.

Aviation 22z Friday through Wednesday
Vfr.

Extended aviation outlook: afternoon showers thunderstorms could
provide brief flight restrictions next week. Greatest chances should
occur on Wednesday as a cold front approaches the area. Otherwise,
vfr conditions will prevail.

Marine
Tonight: marine zones will remain on the western periphery of
the bermuda high, resulting in mainly S to SW winds with speeds
less than 15 knots through tonight and seas 2 to 3 ft.

Saturday through Wednesday: broad high pressure will remain across
the marine zones through the period. Low pressure is expected to
develop across the mid atlantic states Sunday into Monday. Ssw winds
are forecast to become gusty across the marine zones on Sunday and
Monday, with gusts below 25 kts. Otherwise, winds should remain
generally from the south. Wave heights are forecast to range between
2 to 4 feet.

Tides coastal flooding
6 pm tide levels are running several tenths above the latest
surge guidance. Taking current trends into account, levels in
charleston harbor have been increased to 7.4 to 7.6 ft mllw
(moderate flood) with 9.2 to 9.4 ft mllw (shallow flood) at
fort pulaski. Have expanded the coastal flood advisory to
include jasper county, sc and much of the central and northern
georgia coast.

Elevated tide levels due to the lunar perigee and new moon will
result in the possibility for minor coastal flooding during the
evening high tides this weekend into early next week, especially
along the sc coast.

Chs watches warnings advisories
Ga... Coastal flood advisory until 9 pm edt this evening for gaz117-
119-139-141.

Sc... Coastal flood advisory until 9 pm edt this evening for
scz048>051.

Marine... None.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 0 mi48 min S 8.9 G 12 85°F 86°F1016.1 hPa (-0.9)
FBIS1 - Folly Island, SC 7 mi48 min S 13 G 15 83°F 1016.5 hPa (-1.0)76°F
41029 - Capers Nearshore (CAP 2) 16 mi40 min SSW 12 G 18 82°F 84°F1015.5 hPa
ACXS1 - ACE Basin Reserve, SC 32 mi63 min SSE 1 87°F 1016 hPa76°F
41033 43 mi40 min S 14 G 18 84°F 85°F1015.5 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 48 mi38 min SSW 9.7 G 14 83°F 84°F1015.9 hPa76°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC7 mi53 minS 1310.00 miFair86°F77°F75%1015.9 hPa
Charleston, Charleston Air Force Base, SC10 mi52 minSW 1010.00 miA Few Clouds88°F72°F59%1015.7 hPa
Mount Pleasant Regional-Faison Field, SC11 mi53 minS 1010.00 miFair88°F75°F66%1015.9 hPa

Wind History from CHS (wind in knots)
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Last 24hrSW10SW7SW5S5CalmS4S3SW4W5S4W4S3S4SW5W6W6SW5SW6S7W7S12S11S10SW10
1 day agoN3S6SW3S4CalmCalmCalmCalmCalmCalmCalmCalmN4CalmW5W34NW4W35SE12S12S9S9
2 days agoS7S8S4S3CalmCalmN3N3CalmCalmCalmCalmCalmCalmCalm4NE4CalmW6S4CalmS6SE20
G24
E5

Tide / Current Tables for Charleston, South Carolina
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Charleston
Click for Map
Fri -- 12:44 AM EDT     0.03 feet Low Tide
Fri -- 04:32 AM EDT     Moonrise
Fri -- 06:26 AM EDT     Sunrise
Fri -- 06:44 AM EDT     5.28 feet High Tide
Fri -- 12:52 PM EDT     -0.69 feet Low Tide
Fri -- 06:50 PM EDT     Moonset
Fri -- 07:18 PM EDT     6.73 feet High Tide
Fri -- 08:25 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.10.71.93.24.45.15.34.73.62.20.8-0.3-0.7-01.43.24.86.16.76.55.64.22.6

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Fri -- 01:16 AM EDT     0.01 knots Slack
Fri -- 03:22 AM EDT     1.63 knots Max Flood
Fri -- 04:32 AM EDT     Moonrise
Fri -- 06:26 AM EDT     Sunrise
Fri -- 07:05 AM EDT     -0.00 knots Slack
Fri -- 10:26 AM EDT     -2.73 knots Max Ebb
Fri -- 01:20 PM EDT     0.00 knots Slack
Fri -- 03:50 PM EDT     2.17 knots Max Flood
Fri -- 06:50 PM EDT     Moonset
Fri -- 07:51 PM EDT     -0.00 knots Slack
Fri -- 08:25 PM EDT     Sunset
Fri -- 11:04 PM EDT     -3.17 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.6-0.40.91.61.51.20.80.1-1-2-2.7-2.6-1.7-0.50.91.92.21.91.61-0.2-1.5-2.6-3.2

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 (18,4,5,8)
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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.