Wednesday, June28, 2017 L-36.com


Marine Weather and Tides
Folly Beach, 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 6:13AMSunset 8:33PM Wednesday June 28, 2017 1:38 PM EDT (17:38 UTC) Moonrise 10:09AMMoonset 11:18PM Illumination 22% Phase: Waxing Crescent; Moon at 5 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- 1234 Pm Edt Wed Jun 28 2017
This afternoon..E winds 15 to 20 kt. Waves 1 to 2 ft.
Tonight..E winds 15 kt, diminishing to 5 to 10 kt after midnight.
Thu..E winds 5 to 10 kt. A chance of showers and tstms in the afternoon.
Thu night..SE winds 5 to 10 kt. A chance of showers and tstms.
Fri..SE winds 5 kt. A chance of showers and tstms.
Fri night..S winds 5 kt. A chance of showers and tstms.
Sat..SW winds 5 to 10 kt. A chance of showers and tstms.
Sat night..SW winds 10 kt. A chance of showers and tstms.
Sun..SW winds 5 to 10 kt. A chance of showers and tstms.
Sun night..SW 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 84 degrees.
AMZ300 1234 Pm Edt Wed Jun 28 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will pass north of the region this afternoon, then shift into the atlantic Thursday. A surface trough will develop inland on Friday and prevail into the weekend.

7 Day Forecast for Marine Location Near Folly Beach, SC
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location: 32.66, -79.92     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 281644
afdchs
area forecast discussion
national weather service charleston sc
1244 pm edt Wed jun 28 2017

Synopsis
High pressure will pass north of the region this afternoon,
then shift into the atlantic Thursday. A surface trough will
develop inland on Friday and prevail into the weekend.

Near term through tonight
We tweaked hourly temps and dew points ever so slightly based
on latest trends, and we lowered a few spots south of i-16 by a
degree for MAX temps since cloud cover is thickest those
locations.

This afternoon: flat ridging will prevail aloft as canadian
high pressure at the surface over virginia shifts east to the
delmarva area. Large scale subsidence, the lack of moisture
(where pwat's are no more than 70-90% of normal) and limited
thermodynamics point toward an atypical late june day void of
much if any convection, below normal temps and for many places
comfortable humidity levels.

The sea breeze and differential heating boundaries are the only
mechanisms for showers t-storms. So we have nothing more than
isolated convection during the mid to late afternoon south of
claxton where there is a little better moisture and boundary
interactions. But would not be surprised to get by with a
completely rainfree forecast.

850 mb temps are at least 1-2 standard deviations below late
june norms, and with jet induced mid and high clouds, plus
diurnally driven cumulus cutting down some on insolation, max
temps today will fall shy of 90f, or about 2-4f below
climatology. Combined with dew points mainly in the 60s will
result in rh levels down into the 40-60% range.

Finally, deep mixing and a modest sea breeze will boost E winds
up as high as 10-15 mph far inland, 15-20 mph and gusty near the
coast.

Tonight: moisture will begin to improve, mainly for southeast
georgia near the altamaha river. Models even depict the
development of a weak coastal trough late tonight. Weak
convergence along the line and within some coastal speed
convergence in the onshore flow will likely result in increasing
coverage of showers and thunderstorms along the georgia coast
and atlantic waters by late. Pop's continue to be in the 20-30
percent range. Lows will fall into the upper 60s in the far
north, ranging to the low 70s elsewhere.

Short term Thursday through Saturday
Heights aloft will gradually build through the period as weak
ridging builds in from the south. Moisture will be on the
increase Thursday as surface high pressure shifts offshore and
low level flow backs to south to southwesterly, bringing a
moist, conditionally unstable airmass back into the region.

Shower and thunderstorm initiation will occur mainly along the
seabreeze corridor, but unimpressive lapse rates could limit the
severe threat. However, models continue to show a weak mid-
level wave passing across the area late Thursday, which would
enhance convection coverage and increase the severe threat.

Given the uncertainty of the wave timing, kept pops slightly
above climo Thursday, mainly along and south of i-16, where the
most moisture will be in place. Moisture will have overspread
the entire area Friday as a weak surface through develops
inland. The same is expected on Saturday, so pops remain
slightly above climo for the entire area to reflect this. Storm
initiation is expected each afternoon along the sea breeze.

Temps will be near normal through the period, with most
variations owing to cloud cover and precip coverage.

Long term Saturday night through Tuesday
High pressure will prevail in the atlantic while a surface
trough persists inland. Southerly flow around the high will keep
plenty of moisture advecting into the southeast during this
time period. The result will be the typical summertime
shower thunderstorm pattern.

Aviation 18z Wednesday through Monday
Although isolated shra tsra will be near the ksav terminal close
to 18z Thursday,VFR conditions are forecast there and at kchs
with the 18z TAF set.

Extended aviation outlook: brief flight restrictions possible
in showers thunderstorms at ksav Thursday, then both ksav and
kchs into the weekend.

Marine
This afternoon: continental high pressure centered in virginia
will slide into the nearby atlantic, as a stationary front
lingers across the florida peninsula. Winds will clock around
to the e, and with a boost from the sea breeze speeds will reach
as high as 15-20 kt. The favorable onshore will allow seas to
build as large as 3-4 ft, with even some 2 foot waves at times
in charleston harbor.

Tonight: no real change overnight, with prevailing easterly
flow. Seas will be in the 2-4 ft range, highest beyond 20 nm.

Thursday through Sunday: high pressure sliding from the mid-
atlantic coast to its more seasonally typical bermuda high
location will remain in control through the period. Expect
mainly light to moderate breezes, with the usual summertime sea
breeze wind enhancements near the coast in the afternoon. Seas
will remain mainly in the 2 to 3 foot range in small southeast
swell and minor local windswell.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term...

short term... Ms
long term... Ms
aviation...

marine...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 2 mi38 min ENE 17 G 19 81°F 1022.4 hPa (+1.2)66°F
CHTS1 8 mi50 min ENE 15 G 21 81°F 84°F1022 hPa
41029 - Capers Nearshore (CAP 2) 19 mi90 min ENE 16 G 21 85°F 83°F1021 hPa
ACXS1 - ACE Basin Reserve, SC 29 mi113 min E 5.1 83°F 1021 hPa70°F
41033 37 mi90 min E 16 G 19 81°F 83°F1020.5 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 45 mi38 min ENE 16 G 19 80°F 80°F1020.9 hPa (+1.3)70°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC5 mi43 minE 13 miPartly Cloudy84°F68°F58%1021.7 hPa
Mount Pleasant Regional-Faison Field, SC18 mi63 minNNE 3 G 1410.00 miFair82°F64°F55%1022 hPa
Charleston, Charleston Air Force Base, SC18 mi1.7 hrsE 1310.00 miMostly Cloudy84°F63°F49%1021.3 hPa

Wind History from JZI (wind in knots)
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Last 24hrE7E6E8SE8E6CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN4CalmCalmNE7NE9
G15
E17NE16
G22
NE13NE12
1 day agoNE11NE9NE9
G14
E8E9E6
G12
E5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN4CalmN5N4E6
2 days agoS8
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S9SW4N9CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW6N6NE6NE11NE10
G16
NE12

Tide / Current Tables for Folly Island (outer coast), South Carolina
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Folly Island (outer coast)
Click for Map
Wed -- 06:04 AM EDT     -0.40 feet Low Tide
Wed -- 06:14 AM EDT     Sunrise
Wed -- 11:09 AM EDT     Moonrise
Wed -- 12:26 PM EDT     5.21 feet High Tide
Wed -- 06:16 PM EDT     -0.12 feet Low Tide
Wed -- 08:31 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.15.64.42.91.30.1-0.4-012.43.74.65.25.14.43.21.80.6-0.10.11.12.53.95

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Wed -- 12:28 AM EDT     -0.00 knots Slack
Wed -- 03:40 AM EDT     -2.77 knots Max Ebb
Wed -- 06:14 AM EDT     Sunrise
Wed -- 06:54 AM EDT     0.00 knots Slack
Wed -- 09:10 AM EDT     1.53 knots Max Flood
Wed -- 11:08 AM EDT     Moonrise
Wed -- 01:00 PM EDT     -0.00 knots Slack
Wed -- 04:05 PM EDT     -2.38 knots Max Ebb
Wed -- 07:08 PM EDT     0.00 knots Slack
Wed -- 08:31 PM EDT     Sunset
Wed -- 09:27 PM EDT     1.61 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.5-0.6-1.8-2.6-2.7-2.1-1.10.11.11.51.51.30.90-1.1-2-2.4-2.1-1.2-0.20.91.51.51.4

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 (13,3,4,5)
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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.