Monday, July23, 2018 L-36.com


Marine Weather and Tides
Sullivan's Island, SC

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Sunrise 6:26AMSunset 8:25PM Monday July 23, 2018 11:35 AM EDT (15:35 UTC) Moonrise 4:13PMMoonset 2:06AM Illumination 81% Phase: Waxing Gibbous; Moon at 11 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- 945 Am Edt Mon Jul 23 2018
Rest of today..S winds 5 to 10 kt, becoming se 10 to 15 kt with gusts to 20 kt this afternoon. A slight chance of showers and tstms late this morning, then a chance of showers and tstms this afternoon.
Tonight..S winds 10 to 15 kt. A chance of showers and tstms.
Tue..S winds 10 to 15 kt. A chance of showers and tstms.
Tue night..S winds 10 to 15 kt. A chance of showers and tstms.
Wed..S winds 10 to 15 kt. A chance of showers and tstms.
Wed night..S winds 10 to 15 kt. A chance of showers and tstms.
Thu..SW winds 5 to 10 kt. A slight chance of showers and tstms.
Thu night..SW winds 10 kt. A slight chance of showers and tstms.
Fri..SW winds 5 to 10 kt. A slight chance of showers and tstms.
Fri night..SW winds 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 84 degrees.
AMZ300 945 Am Edt Mon Jul 23 2018
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Low pressure will persist over the southeast united states through Wednesday before dissipating. Atlantic high pressure is expected to build across the region by late week.

7 Day Forecast for Marine Location Near Sullivan's Island, SC
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location: 32.77, -79.91     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 231415
afdchs
area forecast discussion
national weather service charleston sc
1015 am edt Mon jul 23 2018

Synopsis
Low pressure will persist over the southeast united states
through Wednesday before dissipating. Atlantic high pressure is
expected to build across the region by late week.

Near term through tonight
Today: no major changes were made with the last forecast update.

Latest radar imagery indicates mainly dry conditions.

Synoptically, a deep upper low will remain in place generally
centered over the southeast u.S. With the deepest moisture
likely to remain just offshore and into northeast sc. This
pattern will support steady sse winds across southeast sc ga. It
appears as though the best rain chances this afternoon will be
closer to the i-95 corridor as the sea breeze develops and
moves inland. Scattered to numerous showers and thunderstorms
are forecast to develop along and ahead of the sea breeze.

Moderate instability is expected and with a good bit of mid-
level dry air around some of the strongest storms could produce
damaging wind gusts and or large hail. Deep layer shear is not
really strong so will have to watch for the potential of
training convection which could lead to localized flooding as
well. Highs should be near 90 inland for most areas with
mid upper 80s closer to the coast.

Tonight: showers and thunderstorms will generally diminish
inland this evening and shift more to the coast, especially in
sc. As winds diminish with a surface trough over the area some
fog could develop late inland, especially where it recently
rained. Low temperatures should range from the low 70s inland to
the mid 70s near the coast.

Short term Tuesday through Thursday
A weakening upper trough will exist over the eastern united
states Tuesday into Wednesday. Meanwhile the weak surface low
over the central gulf coast region will become an open trough by
Wednesday. The moisture profile will be a bit drier on Tuesday,
gradually moistening on Wednesday as low-level flow shifts from
south to southeast. Models still indicate the deepest moisture
plume will remain just to the east of the area. That being said,
between convergence within the surface trough, the afternoon
sea breeze, and weak upper vort maxima rotating through, we
expect to see scattered showers and tstms both days with
isolated activity overnight. A few severe thunderstorms are
possible either day though Wednesday may have a slightly greater
potential due to more instability.

The upper trough will lift out on Thursday while atlantic high
pressure begins to rebuild. A decrease in synoptic scale forcing
and weakening mid-level lapse rates should result in less
overall convective coverage on Thursday.

Long term Thursday night through Sunday
The region will become situated on the western periphery of an
expansive deep layered ridge Thursday night through Monday. A
more typical summer time convective pattern will develop with
isolated to scattered tstms each day and highs in the low to mid
90s.

Aviation 14z Monday through Friday
A large area of low pressure will settle over the deep south
region through the 12z TAF period. The low center west of the
forecast area should support steady sse winds through the
period. A drifting sea breeze should form this afternoon,
possibly serving as a focus for showers and thunderstorms, less
inland motion near ksav. I will highlight the potential for
thunderstorms with a prob30 beginning at 22z at sav and 21z at
chs. Following the trend of the past several mornings, I will
forecast ifr ceilings at ksav developing by 11z Tuesday.

Extended aviation outlook: brief flight restrictions will be
possible throughout the period, primarily due to convection. The
best coverage will be Tuesday into Wednesday with more isolated
activity Thursday into the weekend.

Marine
Today tonight: conditions will remain favorable for waterspouts
off the charleston county coast mainly through the rest of the morning.

Otherwise, south-southeast winds between 10-15 kts will remain
across the marine zones through tonight. Wave heights are
forecast to range up to 4 ft today and to 5 ft tonight, highest
near the gulf stream. 6 ft seas are possible so an advisory
cannot completely be ruled out for the charleston county waters
and offshore ga waters starting late tonight.

Tuesday through Wednesday the southerly gradient will be
enhanced between inland low pressure and offshore high pressure.

Winds will occasionally be 15-20 kt, causing seas to build to 6
ft over the outer portions of the marine zones. We may
eventually need small craft advisories for some areas, mainly
Tuesday into Wednesday.

Atlantic high pressure will gradually expand west over our
marine area, bringing a decrease in winds seas Thursday into the
weekend.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term... Rjb
short term... Jrl
long term... Jrl
aviation... Jrl rjb
marine... Jrl rjb


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 1 mi41 min SE 8.9 G 12 83°F 85°F1009.7 hPa
FBIS1 - Folly Island, SC 6 mi35 min S 7 G 8.9 83°F 1010.5 hPa (+0.8)75°F
41029 - Capers Nearshore (CAP 2) 15 mi27 min SSW 7.8 G 14 83°F 84°F1009.3 hPa
ACXS1 - ACE Basin Reserve, SC 32 mi50 min ESE 1.9 84°F 1009 hPa75°F
41033 43 mi27 min SSE 5.8 G 7.8 80°F 85°F1009.5 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 47 mi25 min S 7.8 G 12 81°F 83°F1010.4 hPa76°F

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mount Pleasant Regional-Faison Field, SC11 mi60 minS 69.00 miA Few Clouds84°F77°F79%1009.5 hPa
Charleston, Charleston Air Force Base, SC12 mi39 minESE 910.00 miPartly Cloudy86°F75°F72%1009.3 hPa

Wind History from CHS (wind in knots)
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Last 24hr3SW86SW11S11S13S12SW7SW8E9CalmCalmSE4CalmCalmS3SW6SW4NE9E6CalmE5SE6SE9
1 day agoW7W5SW6W7W7W7W8SW6S6S7S4SW7SW4SW6SW6SW7NW4SW4SW4W5SW8W10W63
2 days agoE4E4S4S7N6CalmW3CalmN4N3N4N4N4N5N4NW4NW5NW5NW6NW3NW7NW8W9NW8

Tide / Current Tables for Fort Johnson, South Carolina
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Fort Johnson
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Mon -- 03:06 AM EDT     Moonset
Mon -- 05:05 AM EDT     4.59 feet High Tide
Mon -- 06:27 AM EDT     Sunrise
Mon -- 11:26 AM EDT     0.20 feet Low Tide
Mon -- 05:13 PM EDT     Moonrise
Mon -- 05:56 PM EDT     5.59 feet High Tide
Mon -- 08:24 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.71.52.53.64.34.64.43.72.81.70.80.30.312.23.54.65.35.65.34.53.32.11.1

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
Click for Map
Mon -- 01:45 AM EDT     1.14 knots Max Flood
Mon -- 03:06 AM EDT     Moonset
Mon -- 05:29 AM EDT     -0.00 knots Slack
Mon -- 06:27 AM EDT     Sunrise
Mon -- 09:05 AM EDT     -1.79 knots Max Ebb
Mon -- 12:07 PM EDT     0.00 knots Slack
Mon -- 02:24 PM EDT     1.36 knots Max Flood
Mon -- 05:12 PM EDT     Moonrise
Mon -- 06:32 PM EDT     -0.00 knots Slack
Mon -- 08:24 PM EDT     Sunset
Mon -- 09:43 PM EDT     -2.29 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.10.91.10.90.70.3-0.3-0.9-1.5-1.8-1.6-1-0.10.81.31.31.31.10.5-0.4-1.3-2.1-2.3-1.8

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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (11,2,3,4)
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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.