Tuesday, April25, 2017 L-36.com


Marine Weather and Tides
Kiawah Island, SC

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:36AMSunset 7:58PM Tuesday April 25, 2017 10:43 AM EDT (14:43 UTC) Moonrise 5:16AMMoonset 6:12PM Illumination 0% Phase: New Moon; Moon at 29 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- 930 Am Edt Tue Apr 25 2017
This afternoon..NW winds 15 kt...becoming W 10 kt late.
Tonight..W winds 5 to 10 kt.
Wed..W winds 5 kt...becoming S 15 kt in the afternoon.
Wed night..S winds 10 to 15 kt.
Thu..SW winds 5 to 10 kt...becoming S 15 kt in the afternoon.
Thu night..S winds 10 to 15 kt.
Fri..S winds 10 to 15 kt.
Fri night..S winds 10 to 15 kt.
Sat..S winds 10 to 15 kt.
Sat night..S winds 10 to 15 kt. Unless otherwise noted...waves 1 foot or less. Charleston harbor water temperature...74 degrees.
AMZ300 930 Am Edt Tue Apr 25 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Low pressure will move away from the area this afternoon while high pressure builds in. A weak disturbance will affect the area Thursday night then high pressure will prevail Friday through the weekend. A cold front will affect the area Monday and Monday night.

7 Day Forecast for Marine Location Near Kiawah Island, SC
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location: 32.59, -80.11     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 251345
afdchs
area forecast discussion
national weather service charleston sc
945 am edt Tue apr 25 2017

Synopsis
Low pressure will move away from the area today while high
pressure builds in. A weak disturbance will affect the area
Thursday night, then high pressure will prevail Friday through
the weekend. A cold front will affect the area Monday and Monday
night.

Near term /through tonight/
This afternoon: stacked low pressure near the great dismal swamp
of nc is still creating an extensive stratus field across the
area, although satellite trends do show some dissipation taking
place. Expect the cloud deck to erode from SW to NE with some
downslope and its associated drying off the mountains. Thus we
still hold out hope on previously forecasted MAX temps based on
increasing insolation, although we have slowed the diurnal
climb quite a bit early on within the cyclonic flow around the
low.

While measurable rainfall is not expected, there is still is
still a smidgen of isentropic lift over our northern counties
to produce a little patchy light rain or drizzle through 12-2
pm, mainly for the charleston quad-county district and beaufort
county.

Tonight: a very quiet night will be on tap as any remaining low
level moisture gets stripped out behind the departing surface
low. The forecast is dry with mostly clear skies and lows in the
upper 50s to low 60s.

Short term /Wednesday through Friday/
Deep layered ridging Wednesday into Thursday will support high
temps in the middle 80s most areas. A weak upper disturbance
will brush past the western areas late Thursday into Thursday
night. Atmospheric moisture will increase enough to support at
least isolated showers and thunderstorms over our inland zones,
possibly the result of a decaying convective cluster late
Thursday afternoon into the evening.

A strengthening low/mid level ridge on Friday with low-level
warm advection and mostly sunny skies will help push high temps
into the upper 80s to lower 90s.

Long term /Friday night through Monday/
Above normal temperatures and mainly dry weather will persist
into Sunday. An upper trough approaches early next week with a
cold front expected to push through Monday and Monday night,
bringing scattered showers/storms.

Aviation /14z Tuesday through Saturday/
At kchs, ifr ceilings are in place and will likely stick around
for another couple of hours. Also, patches of drizzle are
passing through the terminal and briefly reducing visibilities.

Once ceilings lift to MVFR, they will remain there into the
afternoon. Scattering out toVFR will take place later today.

At ksav, ifr ceilings have not made it into the terminal and
likely will not at this point. The forecast initializes with low
end MVFR with a lift toVFR by late morning.

Extended aviation outlook: no significant concerns.

Marine
This afternoon: low pressure will spin near the great dismal
swamp of nc, maintaining a cyclonic flow across the waters
throughout the daylight hours. W-nw winds as high as 15 or 20 kt
will drop off some 5 or 10 kt late as the gradient slackens
considerably. Any resultant sea breeze will be held back until
until the pressure gradient drops off. Seas remain elevated, so
a small craft advisory remains in effect for amz374 with seas up
to 6 ft. The other waters will experience seas of 3-5 ft.

Tonight: the prevailing flow will remain westerly though the
pressure gradient will decrease significantly. Speeds will be on
the decline, becoming no more than 10 knots by sunrise
Wednesday. Seas will generally range 2-4 feet.

Mainly southerly flow will prevail Wednesday into the weekend
as atlantic high pressure holds firm. The strongest winds will
occur in the evening over the nearshore waters where low-level
jetting occurs. Additionally, the seabreeze will be fairly
potent each afternoon along the coast.

Tides/coastal flooding
The upcoming perigean spring tide and recent elevated departures
will allow for potential shallow coastal flooding with the
evening high tides through Thursday. Coastal flood advisories
may be required.

Chs watches/warnings/advisories
Ga... None.

Sc... None.

Marine... Small craft advisory until 2 pm edt this afternoon for amz374.

Near term...

short term... Jrl
long term... Jrl
aviation...

marine...

tides/coastal flooding...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 13 mi44 min W 8 G 13 62°F 1006.6 hPa (+1.5)57°F
CHTS1 16 mi44 min WNW 8 G 12 63°F 74°F1006 hPa (+1.5)
ACXS1 - ACE Basin Reserve, SC 18 mi59 min W 2.9 59°F 1007 hPa58°F
41033 27 mi36 min NW 14 G 19 61°F 70°F1007.1 hPa
41029 - Capers Nearshore (CAP 2) 30 mi36 min W 16 G 21 64°F 71°F1005.3 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 54 mi34 min W 19 G 25 65°F 72°F1005.3 hPa60°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC10 mi49 minW 10 G 1510.00 miOvercast63°F57°F83%1006.1 hPa
Charleston, Charleston Air Force Base, SC23 mi48 minWNW 1110.00 miOvercast61°F55°F84%1005.9 hPa

Wind History from JZI (wind in knots)
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SW4CalmW8W7W8CalmCalmW5W4W4W6W8W6W8W10W13
1 day agoS11S10
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2 days agoS11
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G12

Tide / Current Tables for Kiawah River Bridge, South Carolina
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Kiawah River Bridge
Click for Map
Tue -- 01:48 AM EDT     -0.30 feet Low Tide
Tue -- 06:16 AM EDT     Moonrise
Tue -- 06:39 AM EDT     Sunrise
Tue -- 08:01 AM EDT     6.14 feet High Tide
Tue -- 02:05 PM EDT     -0.60 feet Low Tide
Tue -- 07:12 PM EDT     Moonset
Tue -- 07:57 PM EDT     Sunset
Tue -- 08:25 PM EDT     7.00 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.20-0.30.41.83.44.85.86.15.84.631.40-0.6-0.21.23.14.96.26.96.85.94.3

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Tue -- 02:15 AM EDT     0.01 knots Slack
Tue -- 04:38 AM EDT     1.96 knots Max Flood
Tue -- 06:15 AM EDT     Moonrise
Tue -- 06:38 AM EDT     Sunrise
Tue -- 08:21 AM EDT     -0.00 knots Slack
Tue -- 11:33 AM EDT     -2.92 knots Max Ebb
Tue -- 02:28 PM EDT     0.01 knots Slack
Tue -- 05:00 PM EDT     2.29 knots Max Flood
Tue -- 07:11 PM EDT     Moonset
Tue -- 07:56 PM EDT     Sunset
Tue -- 08:47 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2.6-1.6-0.30.91.81.91.61.20.4-0.8-2-2.8-2.8-2-0.70.71.92.321.50.9-0.3-1.7-2.7

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 (10,2,3,4)
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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.