Saturday, August24, 2019 L-36.com


Marine Weather and Tides
Hanahan, SC

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7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:48AMSunset 7:56PM Saturday August 24, 2019 12:13 AM EDT (04:13 UTC) Moonrise 12:00AMMoonset 2:00PM Illumination 39% Phase: Third Quarter Moon; Moon at 23 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- 1003 Pm Edt Fri Aug 23 2019
Tonight..S winds 5 to 10 kt.
Sat..S winds 5 to 10 kt. A chance of showers and tstms.
Sat night..SE winds 5 to 10 kt, becoming E after midnight. Showers and tstms likely, mainly in the evening.
Sun..NE winds 5 to 10 kt. A chance of showers and tstms in the morning, then showers and tstms likely in the afternoon.
Sun night..NE winds 5 to 10 kt. Showers and tstms likely in the evening, then a chance of showers with a slight chance of tstms after midnight.
Mon..NE winds 10 kt. A chance of showers and tstms.
Mon night..E winds 5 to 10 kt. A chance of showers. A chance of tstms, mainly in the evening.
Tue..E winds 5 kt. A chance of showers and tstms.
Tue night..S winds 5 to 10 kt. A chance of showers and tstms.
Wed..SW winds 5 to 10 kt. A chance of showers and tstms.
Wed 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 86 degrees.
AMZ300 1003 Pm Edt Fri Aug 23 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure will prevail this evening, before a cold front approaches from the north tonight. The front will cross through the area on Saturday, then stall offshore Sunday. Low pressure could pass well offshore during the first half of next week. Another cold front could impact the region late next week.


7 Day Forecast for Marine Location Near Hanahan, SC
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location: 32.91, -79.94     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 240230
afdchs
area forecast discussion
national weather service charleston sc
1030 pm edt Fri aug 23 2019

Synopsis
Atlantic high pressure will prevail this evening, before a cold
front approaches from the north tonight. The front will cross
through the area on Saturday, then stall offshore Sunday. Low
pressure could pass well offshore during the first half of next
week. Another cold front could impact the region late next
week.

Near term until 6 am Saturday morning
An ongoing MCS that is centered along the central savannah
river area (csra) and covering parts of south carolina and
georgia, will continue to drift eastward through the post-
midnight hours. Cloud tops have been as cold as -65 to -70c and
has been sustaining itself for a few hours. This activity is
being sustained along a myriad of boundary collisions and
enhanced by deep moisture convergence, low level theta-e ridging
along with pwat in excess of 120-130% of normal. Based on
recent trends we have increased the coverage of showers and
t-storms into the scattered or numerous range near and west of
us-301, with widely scattered coverage along the northwest tier
of our south carolina counties.

So far the heaviest rains have stayed outside the forecast
boundaries, but with weak storm motion and the deep moisture
content, we still will experience at locally heavy rainfall
where we have the highest pops. Flood advisories could still be
required in a few places, with instantaneous rainfall rates as
high as 2-3 inches hour. That doesn't mean we'll get that much
rain, but perhaps on the magnitude of 3 4 to 1 inch in an hour
or less.

After 1 or 2 am the coverage of convection will have finally
waned, where we have no more than 20-30% pop, mainly northwest
counties.

There continues to be signals of some fog, but not enough to add
to the forecast since condensation pressure deficits aren't low
enough and there will be lingering convective debris clouds.

Lows will be about where they have been of late; lower and
middle 70s west of us-17, upper 70s to near 80f closer to the
coast.

Downtown charleston is still on track to tie their record high
minimum temp for august 23 at 81f, set in 2014 and 2016.

Short term 6 am Saturday morning through Monday
Saturday: a cold front associated with a large mid upper lvl trough
of low pressure will approach from the northwest during the day.

Ahead of the front, an onshore wind will advect deep moisture
characterized by pwats between 2.00-2.25 inches across the region,
helping set up a round of at least scattered to numerous showers and
thunderstorms during the afternoon evening. Modest instability
(sbcape 1500-1750 j kg) should limit the overall severe weather
threat. However, an isolated strong or severe thunderstorm can not
be ruled out during the afternoon into early evening. The greater
concern will be localized heavy rainfall given deep moisture and
weak wind fields in place as the front slowly shifts into the
region. Activity should slowly weaken, but persist into overnight
hours. High temps should range in the upper 80s to lower 90s,
warmest away from the coast in southeast georgia. Overnight lows
should range in the low 70s inland to mid upper 70s near the coast.

Sunday and Monday: a cold front will slowly progress to the coast
and likely stall along or just offshore Sunday, then slowly drift
further south and east into Monday. As the occurs, a potential
tropical cyclone will track north northeast well offshore. The
position of the front and tropical entity offshore will play a
fairly significant role in how much precip can be expected across
southeast south carolina and southeast georgia early next week.

Precip chances should be highest east of the i-95 corridor on Sunday
where pwats remain between 2.00-2.25 inches near the slowly moving
front shifting offshore. Enhanced precip chances could persist near
the coast through Monday as tropical low pressure shifts past the
area well offshore, but the overall threat of heavy rainfall should
be more limited compared to Sunday given the expected position of
the sfc front offshore and the area remaining well west of any
tropical cyclone track. Severe weather potential is quite low Sunday
and especially Monday given abundant clouds and little instability.

Afternoon highs should be a few degrees below normal, ranging in the
mid upper 80s. Overnight lows should range around 70 well inland to
low mid 70s near the coast.

Long term Monday night through Friday
Models are in good agreement that low pressure will be lifting
northeast away from the area Monday night into Tuesday. Another cold
front could impact the region later in the period. There are some
discrepancies in regards to convective coverage but with elevated
moisture and shortwave energy, it looks to stay a bit unsettled.

Temperatures are expected to be near normal.

Aviation 03z Saturday through Wednesday
Conditions are expected to beVFR a large portion of the time at
both kchs and ksav tonight and Saturday morning. However, there
are concerns for possible restrictions at ksav between about
10z and 13z Saturday due to fog and or stratus.

There then looks to be scattered to numerous shra tsra across
the local region Saturday afternoon and evening as a cold front
draws closer from the north. Aided by a low level flow off the
ocean and upper difluence, there is a good chance that at least
occasional flight restrictions (if not more prolonged sub-vfr
weather) will occur. For now we have just vcts and CB clouds at
both terminals, but adjustments will definitely be required in
later TAF issuances with the potential for some heavy rainfall.

Extended aviation outlook: periodic flight restrictions are possible
Saturday night Sunday due to showers thunderstorms associated
with a slowly passing cold front. Brief flight restrictions are
possible Monday and Tuesday behind a front stalled offshore.

Marine
Tonight: tranquil weather is expected with S to SE winds at or
below 12 kt early, becoming mainly S or SW at or below 10 kt by
daybreak. Seas will be 1-3 ft.

Saturday through Wednesday: a cold front will approach from the
north northwest Saturday and stall across the coastal waters through
early next week. Well south of the region, a tropical low should
slowly strengthen while gaining latitude off eastern florida,
remaining beyond all coastal waters while tracking north northeast
well off the southeast coast. The setup will initially favor
southeast winds across coastal waters Saturday at or below 10-15 kt,
before turning predominately northeast and increasing to 15-20 kt
Sunday and Monday as the pressure gradient tightens between the
stalled front and passing tropical low offshore. Seas should also
build up to 4-5 ft. Conditions could approach small craft advisory
levels for a period on Monday before the tropical low departs
north northeast of the region Tuesday. Conditions will then remain
well below small craft advisory levels through midweek.

Rip currents: increasing east northeast winds could contribute to an
enhanced risk of rip currents on area beaches late this weekend into
early next week, especially if tropical low pressure intensifies
while tracking well offshore.

Tides coastal flooding
Astronomical tides will be running close to minor coastal flood
advisory levels next week and onshore winds could lead to even
higher tides, mainly during the evening high tide cycles starting
Monday. In addition, there is the potential for some heavy rain
around the times of high tide which could exacerbate any flooding
issues.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term...

short term...

long term... Etm
aviation...

marine...

tides coastal flooding...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 9 mi74 min S 5.1 G 7 83°F 87°F1016.8 hPa (+0.6)
FBIS1 - Folly Island, SC 16 mi74 min S 8 G 8 84°F 1017.3 hPa (+0.9)77°F
41029 - Capers Nearshore (CAP 2) 18 mi66 min SSW 9.7 G 14 85°F 86°F1016.8 hPa
ACXS1 - ACE Basin Reserve, SC 36 mi89 min Calm 80°F 1017 hPa77°F
NIWS1 - North Inlet-Winyah Bay Reserve, SC 50 mi89 min NW 1 76°F 1016 hPa74°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston, Charleston Air Force Base, SC5 mi2.3 hrsSSW 310.00 miA Few Clouds80°F73°F82%1016.3 hPa
Mount Pleasant Regional-Faison Field, SC8 mi2.3 hrsN 09.00 miFair79°F77°F94%1016.3 hPa
Charleston Executive Airport, SC15 mi2.3 hrsN 010.00 miFair82°F77°F84%1016.3 hPa
Moncks Corner Berkeley County, SC20 mi2.3 hrsN 010.00 miFair75°F73°F94%1016.9 hPa
Summerville Airport, SC21 mi2.3 hrsN 010.00 miFair75°F73°F94%1016.3 hPa

Link to 5 minute data for KCHS

Wind History from CHS (wind in knots)
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Last 24hrSW5S3S4CalmCalmSW3CalmW3W6W6S5W4W4W6S8S13S8S9S8S7S3S3S4Calm
1 day agoS5S6S4SW5SW5W3W3W5W7SW10W95SW7SW8S6SW10SW6S4S6S8S6S4S6S6
2 days agoS7SW6W4SW4SW4W3W3SW4SW8W76SW66S10S9SW11S11SW10S7S9SW7S9SW5S5

Tide / Current Tables for Clouter Creek, north entrance, Cooper River, South Carolina
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Clouter Creek
Click for Map
Sat -- 12:47 AM EDT     Moonrise
Sat -- 03:04 AM EDT     4.87 feet High Tide
Sat -- 06:48 AM EDT     Sunrise
Sat -- 09:20 AM EDT     0.83 feet Low Tide
Sat -- 03:00 PM EDT     Moonset
Sat -- 03:54 PM EDT     5.80 feet High Tide
Sat -- 07:54 PM EDT     Sunset
Sat -- 10:13 PM EDT     1.43 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.34.14.74.94.74.13.12.11.30.90.91.62.7455.65.85.54.73.62.61.81.41.6

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Sat -- 12:47 AM EDT     Moonrise
Sat -- 02:34 AM EDT     -0.00 knots Slack
Sat -- 06:12 AM EDT     -1.72 knots Max Ebb
Sat -- 06:48 AM EDT     Sunrise
Sat -- 09:19 AM EDT     0.00 knots Slack
Sat -- 12:09 PM EDT     1.54 knots Max Flood
Sat -- 02:59 PM EDT     Moonset
Sat -- 03:41 PM EDT     -0.00 knots Slack
Sat -- 07:11 PM EDT     -1.91 knots Max Ebb
Sat -- 07:54 PM EDT     Sunset
Sat -- 10:24 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.20.70.3-0.2-0.9-1.5-1.7-1.6-1.1-0.30.51.11.51.30.80.4-0.2-1-1.6-1.9-1.7-1.1-0.30.4

Weather Map and Satellite Images
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wmap_A
GOES Local Image of    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 (0,6,7,8)
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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.