Tuesday, August20, 2019 L-36.com


Marine Weather and Tides
Mount Pleasant, SC

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7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
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Sunrise 6:44AMSunset 8:00PM Tuesday August 20, 2019 12:21 PM EDT (16:21 UTC) Moonrise 10:02PMMoonset 10:08AM Illumination 75% Phase: Waning Gibbous; Moon at 20 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- 1006 Am Edt Tue Aug 20 2019
Today..S winds 10 to 15 kt. A slight chance of showers. A slight chance of tstms this afternoon.
Tonight..S winds 5 to 10 kt.
Wed..SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts to 20 kt in the afternoon. A slight chance of showers and tstms in the morning, then a chance of showers and tstms in the afternoon.
Wed night..S winds 10 to 15 kt with gusts to 20 kt, becoming sw 5 to 10 kt after midnight. A chance of showers and tstms.
Thu..SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts to 20 kt in the afternoon. A chance of showers and tstms.
Thu night..S winds 10 to 15 kt with gusts to 20 kt, becoming sw 5 to 10 kt after midnight. A chance of showers and tstms.
Fri..SW winds 5 to 10 kt. A chance of showers and tstms.
Fri night..SW winds 5 to 10 kt. A chance of showers and tstms.
Sat..SW winds 5 to 10 kt. A chance of showers and tstms.
Sat night..SE 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 85 degrees.
AMZ300 1006 Am Edt Tue Aug 20 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure and an inland trough will prevail until late week when a cold front possibly affects the area.


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 201428
afdchs
area forecast discussion
national weather service charleston sc
1028 am edt Tue aug 20 2019

Synopsis
Atlantic high pressure and an inland trough will prevail until
late week when a cold front possibly affects the area.

Near term through tonight
The wave of low pressure that was earlier within the central
savannah river valley has become less evident, while the
associated mid level low will drift northeast into the south
carolina upstate. A vort tail extending from the low will move
into our area throughout the day, and that along with
differential heating boundaries resulting from the expansive
cloud cover, plus the sea breeze will be the main focus for
convection. We have just isolated to scattered showers this
morning ,mainly near and west of us-301 and over the south
carolina coastal counties. Coverage will ramp up into the 50-60%
range during the mid and late afternoon, when the best
interaction of boundaries occurs and the sea breeze becomes more
active. This appears to be generally inland from us-17.

Modified soundings due yield decent thermodynamics, especially
in regards to SBCAPE as high as 3300-3900 j kg, along with lifted
indices of -7 to -9c and dcape of 1000-1300 j kg. So maybe
there is a risk for a couple of stronger or marginally severe
storms where the strongest updrafts occur due to boundary
collisions between 3 pm and 7 pm. This of course is dependent
upon us actually reaching our forecast maximum temps. And this
is not a certainty given the extensive cloud cover from this
morning that will cause some havoc with diurnal and maximum
temps. On average we raised hourly temps to the east early on
and lowered them inland, while just tweaking the highs for this
afternoon we have them reaching 87-91f.

Isolated showers and storms may persist over the marine zones
and inland counties tonight. Low temperatures are forecast to
range from the low to mid 70s inland to the upper 70s along the
coast.

Short term Wednesday through Friday
Moderate to high confidence this period. Deep layer troughing will
linger inland while high pressure persists offshore. Mainly
expecting near normal rain chances, especially each
afternoon evening. Given the deep moisture and generally light low-
mid level winds there will at least be a small risk of localized
heavy rain flooding. Also can't completely rule out isolated severe
storms each day but conditions aren't that favorable for much severe
weather due to limited instability deep layer shear. Temperatures
should be near to above normal.

Long term Friday night through Monday
Low to moderate confidence this period. The pattern doesn't change
much until a cold front likely pushes into the area this weekend,
possibly moving through southeast ga as well early next week. We
prefer the slower wpc ECMWF guidance with regard to the frontal
passage timing. Eventually a more fall-like high pressure wedge
pattern should set up and feature cooler temperatures and above
normal rain chances. Think the severe storm risk will be low with
possibly a better risk for some flooding given the deep moisture and
weak storm motions leading to some training.

Aviation 14z Tuesday through Saturday
Ceilings and visibility values are forecast to remain generallyVFR
at kchs and ksav through the 12z TAF period. Latest trends on
radar and from the cams indicate isolated showers and thunderstorms
will occur over the coastal counties throughout the day. The
potential for tsras appears along and west of i-95 corridor this
afternoon. I will highlight the thunderstorm potential at ksav
with a tempo between 20z-24z, with vcsh throughout the day at
kchs.

Extended aviation outlook: periodic restrictions at kchs ksav each
day through Friday, mainly from afternoon evening showers and
thunderstorms. More significant restrictions are likely this weekend
due to increased moisture and a cold front moving south through
the area.

Marine
The forecast waters will lie near the western parts of typical
atlantic ridge. This will lead to a surface pattern that will
generally support steady south winds between 10-15 kts today and
tonight. Wave heights are forecast to range between 2-3 ft.

Wednesday through Sunday: atlantic high pressure and an inland
trough will result in mainly south southwest winds around 15 knots
or less through the period. No significant marine impacts are
expected other than some stronger storms from time to time.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term...

short term... Rjb
long term... Rjb
aviation...

marine...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 11 mi52 min S 9.9 G 12 85°F 85°F1021.5 hPa
41029 - Capers Nearshore (CAP 2) 14 mi74 min SSW 7.8 G 12 84°F 84°F1021.4 hPa
FBIS1 - Folly Island, SC 17 mi82 min SSW 8 G 8.9 84°F 1021.7 hPa (+1.2)77°F
ACXS1 - ACE Basin Reserve, SC 42 mi97 min SSW 1 86°F 1021 hPa76°F
NIWS1 - North Inlet-Winyah Bay Reserve, SC 45 mi97 min S 5.1 86°F 1020 hPa78°F
41004 - EDISTO - 41 NM Southeast of Charleston, SC 49 mi42 min SSE 1.9 G 3.9 85°F 83°F1021.6 hPa78°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mount Pleasant Regional-Faison Field, SC3 mi87 minS 67.00 miPartly Cloudy86°F78°F79%1021 hPa
Charleston, Charleston Air Force Base, SC11 mi86 minS 810.00 miMostly Cloudy86°F75°F70%1020.8 hPa
Charleston Executive Airport, SC18 mi87 minS 89.00 miMostly Cloudy86°F77°F75%1021 hPa
Moncks Corner Berkeley County, SC21 mi87 minWSW 57.00 miPartly Cloudy84°F77°F79%1021 hPa

Link to 5 minute data for KCHS

Wind History from CHS (wind in knots)
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Last 24hrS8SW6SW11--S13
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S7S10S6S6S6--------SW5--CalmCalmCalmCalmSW4SW8S8S5
1 day agoW6W5S7S11SW8W5S9S10S7S7--------SW5--SW5W4CalmW5--Calm--SW8
2 days agoSE7E6N3W6W10
G18
W3W8S7W7SW5W5W3CalmW5W4--SW7SW6W4SW4W7SW6W8W7

Tide / Current Tables for Cainhoy, Wando River, South Carolina
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Cainhoy
Click for Map
Tue -- 12:05 AM EDT     6.20 feet High Tide
Tue -- 06:10 AM EDT     0.62 feet Low Tide
Tue -- 06:45 AM EDT     Sunrise
Tue -- 11:08 AM EDT     Moonset
Tue -- 12:25 PM EDT     6.09 feet High Tide
Tue -- 06:23 PM EDT     1.01 feet Low Tide
Tue -- 07:59 PM EDT     Sunset
Tue -- 11:01 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.25.953.72.31.20.60.91.93.34.65.6665.34.12.81.71.11.11.93.14.45.4

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Tue -- 03:10 AM EDT     -2.02 knots Max Ebb
Tue -- 06:19 AM EDT     0.00 knots Slack
Tue -- 06:46 AM EDT     Sunrise
Tue -- 08:54 AM EDT     1.50 knots Max Flood
Tue -- 11:08 AM EDT     Moonset
Tue -- 12:18 PM EDT     -0.00 knots Slack
Tue -- 03:31 PM EDT     -1.84 knots Max Ebb
Tue -- 06:39 PM EDT     0.00 knots Slack
Tue -- 07:59 PM EDT     Sunset
Tue -- 09:15 PM EDT     1.34 knots Max Flood
Tue -- 11:02 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.1-1-1.7-2-1.8-1.1-0.30.51.21.51.20.70.2-0.6-1.3-1.8-1.8-1.3-0.50.20.91.31.20.7

Weather Map and Satellite Images
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wmap_A
GOES Local Image of Southeast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (12,3,4,5)
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Ground Weather Radar Station Charleston, SC
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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.