Monday, April23, 2018 L-36.com


Marine Weather and Tides
Seabrook Island, SC

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 6:38AMSunset 7:57PM Monday April 23, 2018 10:52 PM EDT (02:52 UTC) Moonrise 12:37PMMoonset 1:44AM Illumination 63% Phase: Waxing Gibbous; Moon at 9 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- 1031 Pm Edt Mon Apr 23 2018
.small craft advisory in effect until 2 am edt Tuesday...
Tonight..SE winds 15 to 20 kt with gusts to 25 kt, becoming S 10 to 15 kt with gusts to 20 kt after midnight. Waves 2 to 3 ft. A slight chance of tstms. Showers. Locally heavy rainfall possible.
Tue..S winds 10 kt. A chance of showers, mainly in the morning.
Tue night..SW winds 5 to 10 kt.
Wed..W winds 5 to 10 kt.
Wed night..W winds 5 kt.
Thu..N winds 5 kt, becoming se in the afternoon. A slight chance of showers.
Thu night..S winds 5 kt. A chance of showers.
Fri..W winds 5 to 10 kt.
Fri night..SW winds 5 to 10 kt.
Sat..W winds 5 to 10 kt.
Sat night..NW winds 5 to 10 kt. Mariners are reminded that winds and waves higher in and near tstms. Unless otherwise noted, waves 1 foot or less. Charleston harbor water temperature 65 degrees.
AMZ300 1031 Pm Edt Mon Apr 23 2018
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Low pressure will shift over the area tonight, then slowly move up the east coast through mid week. An upper disturbance will move over the area Thursday night, followed by a cold front late week. High pressure will return over the weekend.

7 Day Forecast for Marine Location Near Seabrook Island, SC
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location: 32.6, -80.13     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 240237
afdchs
area forecast discussion
national weather service charleston sc
1037 pm edt Mon apr 23 2018

Synopsis
Low pressure will shift over the area tonight, then slowly move
up the east coast through mid week. An upper disturbance will
move over the area Thursday night, followed by a cold front
late week. High pressure will return over the weekend.

Near term until 6 am Tuesday morning
Radar indicates the bulk of the deep moisture is currently over
the charleston-tri county area and moving northward. Further
west, far inland, there is a band of showers and thunderstorms.

Spc mesoanalysis shows mlcapes around 1,000 j kg in this area
along with 0-6 km shear ~40 kt. However, cam's indicate the
atmosphere becoming more stable in this area in the upcoming
hours as we lose the heating of the day. For the upcoming 1-2
hours, gusty winds and maybe small hail are the immediate
concern in these thunderstorms. But then conditions will improve
afterwards as the synoptic and mesoscale pattern becomes less
favorable for convection.

Synoptically, the deep upper low and attending surface low
centered over tennessee will slowly lift to the northeast. As
this occurs, a warm front will continue to lift northward
through the forecast area the rest of this evening and
overnight, pushing away the moisture and being backfilled by
drier air. Skies will be cloudy, though portions of southeast
georgia could start to scatter out late. It will be a mild night
with lows only falling into the low to mid 60s. Winds will
remain strong and gusty into the charleston county for a few
more hours, then easing overnight.

Short term 6 am Tuesday morning through Thursday
Tuesday: a cold front will be offshore by daybreak, shifting
northeast and further offshore while an area of sfc low pressure
tracks along near the mid-atlantic coast. A trailing mid upper
lvl low to the west northwest will slowly meander over the
southeast during the day, then shift over the mid-atlantic
states late day and night. The overall pattern suggests mostly
dry conditions and less cloud cover. However, a few showers can
not be ruled out across northern and inland areas in southeast
south carolina, as the mid upper lvl low shifts just north of
the area. Overall highs will be slightly warmer, peaking in the
upper 70s under partly cloudy skies. Overnight lows will be
fairly mild, ranging in the mid upper 50s away from the
immediate coast.

Wednesday: the main mid upper lvl low will continue to shift
east- northeast and away from the area, setting up dry
conditions and mostly sunny skies as high pressure temporarily
shifts into the region and a downsloping wind component occurs
over the southeast. Overall highs should be a degree of two
warmer than the previous day with more sun. In general, highs
should peak in the upper 70s to around 80, warmest along and
east of the i-95 corridor. Temps will remain mild overnight,
ranging in the mid upper 50s away from the immediate coast.

Thursday: the next best chance of rainfall should occur with a
low pressure system that quickly advances over the deep south
and to the southeast united states. Latest trends suggest much
of the area will remain dry during daylight hours until the bulk
of strongest forcing arrives with an h5 shortwave aloft late
day and overnight. Chances of showers have been limited to
inland areas through the afternoon, before precip activity
increases during the evening and overnight. Increasing clouds
and showers late in the day could limit overall heating
potential. In general, high temps should approach the mid upper
70s, warmest in southeast georgia.

Long term Thursday night through Monday
Forecast confidence in the extended period continues to be low
given large spread in model guidance. General consensus is that
a cold front will cross the area late week early weekend. Given
the uncertainty on details, have kept pops pretty low until
trends become clearer. Models come into better agreement on
Sunday with a return to high pressure. Temperatures through the
period will generally be near normal, perhaps slightly cooler on
Saturday.

Aviation 03z Tuesday through Saturday
00z tafs:
kchs: the main portion of deep moisture has moved north of the
terminal. Periods of -shra should continue for the first few
hours in the TAF period followed by drying conditions. Ifr
ceilings are expected until around daybreak Tuesday, thenVFR
will take hold. Gusty E winds will ease over the first few hours
of the TAF period.

Ksav: -shra or vcsh is expected for the initial part of the taf
period, followed by drying conditions. Ifr ceilings are
expected until around daybreak Tuesday, thenVFR will prevail.

Extended aviation outlook: flight restrictions are possible
with showers late Thursday early Friday.

Marine
Tonight: no changes with the marine forecast. The gale warning
for the charleston county waters continues and will be in place
through 2 am. Elsewhere, at least solid small craft advisory
conditions are ongoing and the advisories remain in effect. Seas
remain very steep, with 41004 reporting 16 ft at 10 seconds and
41008 reporting 7 feet at 9 seconds. As the warm front lifts
northward, conditions are improving across our ga waters and
the same will be expected across the sc waters in the upcoming
hours. After midnight the gradient will be less than it is now,
allowing for lowering winds and seas.

High surf: the high surf advisory continues for the charleston
county coast through the early morning hours.

Tuesday through Saturday: marine conditions will improve
Tuesday as a cold front and low pressure lift northeast and away
from the area. Small craft advisories will gradually drop as
seas fall below 6 ft, first in the southern nearshore georgia
waters late Tuesday morning, then nearshore south carolina
waters south of edisto, sc early Tuesday afternoon. Higher seas
will linger in northern sc waters and offshore georgia waters
through Tuesday night and potentially into early Wednesday
morning. Low confidence remains in the forecast late week given
model discrepancies, but it appears conditions will remain below
any headline criteria. A cold front could drop through the
waters early in the weekend, then high pressure will return for
the remainder of the weekend.

Chs watches warnings advisories
Ga... None.

Sc... High surf advisory until 5 am edt Tuesday for scz050.

Marine... Small craft advisory until 2 pm edt Tuesday for amz352-354.

Gale warning until 2 am edt Tuesday for amz350.

Small craft advisory until 8 am edt Wednesday for amz374.

Small craft advisory until 2 am edt Tuesday for amz330.

Near term...

short term... Dpb
long term... Ect
aviation... Bsh dpb
marine... Bsh dpb


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FBIS1 - Folly Island, SC 14 mi52 min ESE 17 G 21 66°F 1015.5 hPa65°F
CHTS1 17 mi52 min E 14 G 19 66°F 65°F1015.1 hPa (+0.3)
ACXS1 - ACE Basin Reserve, SC 17 mi67 min N 4.1 68°F 66°F
41033 27 mi44 min SE 14 G 19 67°F 64°F1013.5 hPa
41029 - Capers Nearshore (CAP 2) 30 mi44 min ESE 23 G 37 65°F 1013.6 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 55 mi42 min ESE 31 G 43 67°F1015.1 hPa

Wind History for Charleston, SC
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NE18
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NE12
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NE5
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC10 mi57 minE 10 G 174.00 miFog/Mist66°F66°F100%1015.2 hPa
Charleston, Charleston Air Force Base, SC22 mi1.9 hrsESE 21 G 283.00 miHeavy Rain Fog/Mist and Breezy67°F64°F93%1015.2 hPa

Wind History from JZI (wind in knots)
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1 day agoNE8NE8NE8E8NE7NE7NE8NE7NE7NE7E11E11E12E11E12E14
G20
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G18
E11E12NE9
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2 days agoCalmCalmCalmNE3NE6E8E8
G15
NE8NE8NE6NE7NE13
G18
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NE11NE8NE8NE9

Tide / Current Tables for Kiawah River Bridge, South Carolina
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Kiawah River Bridge
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Mon -- 02:43 AM EDT     Moonset
Mon -- 03:05 AM EDT     6.17 feet High Tide
Mon -- 06:41 AM EDT     Sunrise
Mon -- 09:22 AM EDT     0.35 feet Low Tide
Mon -- 01:37 PM EDT     Moonrise
Mon -- 03:47 PM EDT     5.35 feet High Tide
Mon -- 07:56 PM EDT     Sunset
Mon -- 09:41 PM EDT     0.29 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.74.95.86.25.94.93.62.21.10.40.51.22.43.54.55.25.34.83.82.61.40.50.31

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
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Mon -- 02:42 AM EDT     Moonset
Mon -- 03:21 AM EDT     -0.00 knots Slack
Mon -- 06:39 AM EDT     -2.38 knots Max Ebb
Mon -- 06:40 AM EDT     Sunrise
Mon -- 09:52 AM EDT     0.00 knots Slack
Mon -- 12:01 PM EDT     1.39 knots Max Flood
Mon -- 01:35 PM EDT     Moonrise
Mon -- 03:51 PM EDT     -0.00 knots Slack
Mon -- 07:07 PM EDT     -2.13 knots Max Ebb
Mon -- 07:55 PM EDT     Sunset
Mon -- 10:09 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.61.30.90.3-0.7-1.6-2.2-2.3-1.8-0.90.111.41.210.6-0.1-1-1.8-2.1-1.9-1.1-0.20.8

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 (22,6,7,8)
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Ground Weather Radar Station Charleston, SC
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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.