Sunday, May20, 2018 L-36.com


Marine Weather and Tides
Sullivan's 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 6:15AMSunset 8:16PM Sunday May 20, 2018 10:10 AM EDT (14:10 UTC) Moonrise 10:28AMMoonset 12:00AM Illumination 31% Phase: Waxing Crescent; Moon at 6 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- 936 Am Edt Sun May 20 2018
Rest of today..S winds 5 to 10 kt. A slight chance of showers and tstms this afternoon.
Tonight..S winds 5 to 10 kt, diminishing to 5 kt after midnight. A slight chance of tstms. A chance of showers, mainly in the evening.
Mon..S winds 5 to 10 kt. A chance of showers with a slight chance of tstms.
Mon night..S winds 5 to 10 kt. A chance of showers with a slight chance of tstms.
Tue..S winds 5 to 10 kt. A chance of showers with a slight chance of tstms.
Tue night..S winds 5 to 10 kt. A chance of showers with a slight chance of tstms.
Wed..S winds 5 to 10 kt. A chance of showers with a slight chance of tstms.
Wed night..SW winds 5 to 10 kt. A slight chance of showers and tstms.
Thu..S winds 5 to 10 kt. A chance of showers with a slight chance of tstms.
Thu night..S winds 5 to 10 kt. A chance of showers with a slight chance of 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 77 degrees.
AMZ300 936 Am Edt Sun May 20 2018
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A tropical air mass will remain in place through the week between high pressure offshore and low pressure to the west.

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 201357
afdchs
area forecast discussion
national weather service charleston sc
957 am edt Sun may 20 2018

Synopsis
A tropical air mass will remain in place through the week
between high pressure offshore and low pressure to the west.

Near term until 6 pm this evening
The tropical moisture plume is not as defined as the past few
days. Pwats are down by about 0.25 inch per 12z raobs and mid-
level heights are rising suggesting the subtropical ridge is
retrograding west as expected. Today's convective pattern will
be more typical of early summer with convection primary
developing ahead of the afternoon sea breeze circulation and
lingering convective outflows from previous day's activity.

Expect scattered showers tstms to develop away from the coast
this afternoon with the greatest concentration occurring across
interior southeast georgia ahead of the sea breeze and what
appears to be a southward moving outflow boundary out the
southern midlands. Pops today will range from 20-30% coast with
30-50% inland, highest interior southeast georgia.

Extensive cloud cover will limit afternoon highs, but latest
mesoscale guidance suggests there could be enough breaks in the
cloud canopy to support highs in the mid 80s in a few locations.

However, most areas should only top out in the lower 80s way
from the beaches. Modified soundings are not overly unstable,
but a few strong tstms can not be ruled out where pockets of
higher instability develop.

Short term 6 pm this evening through Wednesday
Tonight: near term guidance indicates that deep moisture will
continue to drift inland tonight, with drier air approaching from
the western atlantic. At the sfc, large high pressure centered over
bermuda is expected to ridge west across sc. At the mid level,
gfs1deg shows a broad mid level low lingering over the fl panhandle
with ridging over the grand strand. Mid level q-vector convergence
remains across the forecast area through the overnight hours. Given
the relatively moist environment and weak synoptic scale forcing, i
will indicate schc to chc pops overnight. Low temperatures are
forecast to range from the upper 60s inland to around 70 across the
beaches.

Monday through Wednesday: not much change in thinking with the
latest forecast. The area will remain on the western fringes of
atlantic high pressure centered to the east with weak low
pressure nearby to the west. This pattern will maintain the
tropical air mass in place leading to higher than normal rain
chances, especially in ga and inland toward the midlands csra
where the better moisture and forcing are expected. Rain amounts
are still a bit uncertain as much depends on exactly how close
the low is to the area but some places could easily pick up
several inches of rain through the period. Overall though we
don't anticipate significant flooding, or severe storms for that
matter. Temperatures will generally be near to above normal,
although highs could easily stay below normal in places that see
abundant rain cloud coverage during the afternoon.

Long term Wednesday night through Saturday
Atlantic high pressure should extend west over the area through the
period while low pressure persists to the west. This pattern will
maintain the warm and muggy conditions with some heavy rain at
times. In general it looks like temperatures will be near to
slightly above normal.

Aviation 14z Sunday through Thursday
Rounds of high and mid debris clouds will drift over the
terminals this morning. Kchs was observing MVFR ceiling prior to
the issuance of the 12z taf. Based on latest lamp guidance and
appearance of the sky, I will forecast a return toVFR by 14z.

Ksav has beenVFR early this morning. However, recent
observation indicates that few MVFR based clouds have developed
over the past couple of hours. Early daytime heating may aid in
a period of ceilings between 12z to 14z, highlighted with a
tempo. Hrrr indicates that showers and isolated thunderstorms
may develop between 21z-03z, greatest coverage across the
inland counties. Winds should remain steady from the sse through
the daylight hours, light to calm at night.

Extended aviation outlook: a persistent tropical air mass will lead
to higher than normal rain chances through the period, mainly each
afternoon. Thunder chances will be low however given the limited
instability.

Marine
A large high pressure centered over bermuda will gradually ridge
west over the marine zones today through tonight. South winds today
will back slightly from the southeast tonight, speeds remaining
around 10 kts. After daybreak today, wave heights are forecast to
range from 2-4 ft within 20 nm to around 5 ft beyond 20 nm.

Monday through Friday: the area will generally remain between low
pressure to the west and high pressure to the east. No significant
wind concerns, however seas will be elevated near advisory levels
close to the gulf stream at least through Tuesday.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTS1 1 mi40 min S 6 G 8 76°F 77°F1021.7 hPa
FBIS1 - Folly Island, SC 6 mi70 min S 8 G 8.9 75°F 1022.2 hPa (+1.4)73°F
41029 - Capers Nearshore (CAP 2) 15 mi62 min S 9.7 G 12 74°F 75°F1022.3 hPa
ACXS1 - ACE Basin Reserve, SC 32 mi85 min Calm 77°F 1021 hPa72°F
41033 43 mi62 min S 7.8 G 12 74°F 76°F1021.1 hPa
41004 - EDISTO - 41 NM Southeast of Charleston, SC 47 mi30 min SSE 5.8 G 7.8 74°F1021.9 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC7 mi75 minS 67.00 miOvercast77°F73°F89%1021.7 hPa
Mount Pleasant Regional-Faison Field, SC11 mi75 minSSE 48.00 miMostly Cloudy75°F73°F94%1021.7 hPa
Charleston, Charleston Air Force Base, SC12 mi2.2 hrsS 510.00 miMostly Cloudy75°F72°F90%1020.8 hPa

Wind History from CHS (wind in knots)
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Last 24hrSE5Calm--SE3SE4SE11SE11S9SE11SE8SE10S9S9S8S5S4SW4S5S5S5SE3SE3S5S5
1 day agoS5S9S10S10S7S8S9S9
G16
S9S12S9SE9S8S8SE7SE7S6S6S12S6CalmS8S8S6
2 days agoS7S12SW12SW15S14
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Tide / Current Tables for Fort Johnson, South Carolina
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Fort Johnson
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Sun -- 12:19 AM EDT     6.05 feet High Tide
Sun -- 12:40 AM EDT     Moonset
Sun -- 06:17 AM EDT     Sunrise
Sun -- 06:54 AM EDT     -0.19 feet Low Tide
Sun -- 11:28 AM EDT     Moonrise
Sun -- 01:01 PM EDT     4.94 feet High Tide
Sun -- 07:03 PM EDT     -0.13 feet Low Tide
Sun -- 08:15 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
65.95.24.12.61.20.1-0.20.31.42.83.94.74.94.73.92.71.30.3-0.10.31.42.94.3

Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current
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Charleston Harbor Entrance
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Sun -- 12:40 AM EDT     Moonset
Sun -- 01:05 AM EDT     -0.00 knots Slack
Sun -- 04:20 AM EDT     -2.77 knots Max Ebb
Sun -- 06:17 AM EDT     Sunrise
Sun -- 07:34 AM EDT     0.00 knots Slack
Sun -- 09:50 AM EDT     1.57 knots Max Flood
Sun -- 11:28 AM EDT     Moonrise
Sun -- 01:32 PM EDT     -0.00 knots Slack
Sun -- 04:42 PM EDT     -2.31 knots Max Ebb
Sun -- 07:42 PM EDT     0.00 knots Slack
Sun -- 08:14 PM EDT     Sunset
Sun -- 10:13 PM EDT     1.77 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.1-1.1-2.1-2.7-2.6-1.7-0.60.51.31.61.310.5-0.5-1.5-2.1-2.3-1.7-0.70.31.31.81.6

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 (10,2,3,4)
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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.