Wednesday, June28, 2017 L-36.com


Marine Weather and Tides
Rockville, SC

Version 3.4
What's New / NOTES
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.
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.

Sunrise 6:13AMSunset 8:33PM Wednesday June 28, 2017 10:01 PM EDT (02:01 UTC) Moonrise 10:10AMMoonset 11:19PM Illumination 25% Phase: Waxing Crescent; Moon at 5 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- 640 Pm Edt Wed Jun 28 2017
Tonight..E winds 15 kt, diminishing to 5 to 10 kt late this evening and overnight.
Thu..E winds 10 to 15 kt. A slight chance of showers and tstms in the afternoon.
Thu night..SE winds 5 to 10 kt. A chance of showers. A chance of tstms, mainly in the evening.
Fri..SE winds 5 kt. A chance of showers and tstms.
Fri night..S winds 5 kt. A chance of showers. A chance of tstms, mainly in the evening.
Sat..SW winds 5 to 10 kt. A chance of showers and tstms.
Sat night..SW winds 10 kt. A chance of showers and tstms.
Sun..SW winds 5 to 10 kt. A chance of showers and tstms.
Sun night..SW winds 5 to 10 kt. A chance of showers and tstms.
Mon..SW winds 5 kt. A chance of showers and tstms.
Mon night..SW winds 5 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 84 degrees.
AMZ300 640 Pm Edt Wed Jun 28 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure to the north will move into the atlantic tonight and Thursday. A surface trough will develop inland on Friday and prevail into the weekend. A deteriorating cold front will approach the area early next week.

7 Day Forecast for Marine Location Near Rockville, SC
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location: 32.6, -80.29     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 282342
afdchs
area forecast discussion
national weather service charleston sc
742 pm edt Wed jun 28 2017

Synopsis
High pressure to the north will move into the atlantic tonight and
Thursday. A surface trough will develop inland on Friday and prevail
into the weekend. A deteriorating cold front will approach the area
early next week.

Near term until 6 am Thursday morning
As of 725 pm: the sfc pattern will feature ridging carolina
high pressure centered over the western atlantic and low
pressure over la, supporting ese winds through tonight. An
isolated showers developed along a convergence line over liberty
county, with a few showers over amz374 and 354. I will update
the forecast to add isolated showers to the forecast.

Previous discussion:
while we can't entirely rule out a stray shower along the sea
breeze and other meso-scale boundaries over far inland SE ga
near the altamaha river, for the most part it will remain
rainfree with scattered-broken cumulus and scattered-broken
cirrus cirrostratus. Temps will slowly fall to the upper 70s and
lower 80s by sunset.

For tonight, surface high pressure off the the virginia tidewater
will slide further east into the atlantic, as a short wave
ridge attempts to amplify a little further. While the low level
trajectories from the E and SE will allow for a gradual return
of moisture from off the atlantic, the layer from 850-400 mb
remains essentially void of moisture. This suggests little risk
of any showers, although with isentropic ascent developing, and
a weak mid level impulse drifting in from the SW late in tandem
with some coastal convergence, there might be a few showers or
low topped t-storms over mcintosh county and maybe coastal
liberty county closer to daybreak.

Once diurnal cumulus fade this evening, the jet induced high
level clouds will gradually diminish in areal coverage as the
southern branch of the jet pulls away. This will support skies
becoming mostly clear north and partly cloudy south. But with
the approach of an impulse aloft overnight and moisture flux
convergence, clouds will increase yet again, so that by daybreak
skies will be mostly cloudy south, at least partly cloudy
north.

Temps will end up near or slightly below average for late june,
ranging from the mid 60s in the francis marion to upper 60s and
lower 70s most elsewhere. The exception will be coastal areas
and in downtown charleston where mid 70s will be common due to
the onshore flow.

Short term 6 am Thursday morning through Saturday
Gradually building ridge remains overhead through the period as
surface high pressure slides eastward from the mouth of the
chesapeake bay. Deep layer moisture will fill in across the area
during the day on Thursday, and remain in place into the weekend.

Convective initiation will mainly be along the sea breeze corridor
each afternoon, though there are a couple of features of note which
could spell an increase in precip coverage and intensity. Shortwave
energy rounding the periphery of the upper level ridge will pass
inland of the area during the day Thursday, and could provide some
destabilization locally, especially along and west of us hwy 301, or
more likely allow ample convection to blossom over the piedmont,
which could then either advect toward the coast through the evening
or encourage boundaries to trigger further convection locally.

Additionally, models are indicating that a weak mid-level wave - the
manifestation of a defunct low formerly over the gulf coast - may
provide convective enhancement Friday, especially inland. Above
climo pops have been maintained to account for these features. The
typically waning of convective activity overnight is expected.

Temps will remain below normal through the end of the workweek
owing to onshore flow and ample cloud cover, before returning to
near normal this weekend as a more humid airmass fills in.

Long term Saturday night through Wednesday
High pressure will prevail in the atlantic while a surface
trough persists inland. Southerly flow around the high will keep
plenty of moisture advecting into the southeast during this
time period. The result will be the typical summertime
shower thunderstorm pattern.

Aviation 00z Thursday through Monday
Vfr conditions expected through the 0z TAF period. The sfc
pattern will feature ridging carolina high pressure centered
over the western atlantic and low pressure over la, supporting
ese winds through the period. Winds may become marginally gusty
during Thursday afternoon. A weak front is forecast to lift
toward the mouth of the savannah river during the daylight hours
Thursday. Guidance is divided on the convection potential along
and north of the front. However, I will highlight the limited
potential for tsras with a prob30 from 17z-22z.

Extended aviation outlook: persistent onshore flow advecting a
maritime airmass into the area could bring flight restrictions in
low ceilings Thursday night and Friday morning, thought there is
still significant disagreement amongst guidance. Brief flight
restrictions are also possible in mainly afternoon
showers thunderstorms at both ksav and kchs through the weekend.

Marine
Tonight: a 1023 mb high centered to the NE of the great dismal
swamp will pull east, with its associated ridge axis extending
w-sw across the carolina's. This supports an easterly flow as
high as 15-20 kt this evening due to sea breeze circulations,
before the gradient slackens overnight and speeds drop to less
than 12 kt before sunrise. The long onshore fetch will allow for
seas of 3-4 ft this evening, dropping about a foot by morning
as the wind speeds decrease.

Friday through Monday: high pressure sliding from the mid-
atlantic coast to its more seasonally typical bermuda high
location will remain in control through the period. Expect
mainly light to moderate breezes, with the usual summertime sea
breeze wind enhancements near the coast in the afternoon, and
possible brief periods of gusty winds around daybreak. Seas will
remain mainly in the 2 to 3 foot range in small southeast swell
and minor local windswell.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term... Ned
short term...

long term...

aviation... Ned
marine...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ACXS1 - ACE Basin Reserve, SC 9 mi76 min E 1.9 78°F 1021 hPa66°F
FBIS1 - Folly Island, SC 22 mi61 min E 15 G 17 81°F 1021.6 hPa (+0.5)61°F
CHTS1 23 mi43 min E 11 G 12 81°F 84°F1021.5 hPa
FPKG1 - 8670870 - Fort Pulaski, GA 51 mi43 min ESE 17 G 20 80°F 83°F1020.8 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC17 mi66 minE 5 miFair77°F64°F65%1021 hPa
Beaufort County Airport, SC22 mi66 minE 47.00 miFair77°F69°F79%1020.7 hPa
Beaufort, Marine Corps Air Station, SC24 mi65 minE 610.00 miA Few Clouds80°F70°F71%1020.8 hPa

Wind History from JZI (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmN4CalmCalmNE7NE9
G15
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1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN4CalmN5N4E6E7E6E8SE8E6CalmCalmCalm
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW6N6NE6NE11NE10
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Tide / Current Tables for Steamboat Landing, Steamboat Creek, South Carolina
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Steamboat Landing
Click for Map
Wed -- 12:46 AM EDT     7.18 feet High Tide
Wed -- 06:16 AM EDT     Sunrise
Wed -- 06:41 AM EDT     -0.29 feet Low Tide
Wed -- 11:10 AM EDT     Moonrise
Wed -- 01:24 PM EDT     6.12 feet High Tide
Wed -- 06:54 PM EDT     0.02 feet Low Tide
Wed -- 08:32 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.97.26.44.931.2-0-0.20.41.73.14.45.46.1653.51.80.500.61.83.34.7

Tide / Current Tables for Yonges Island, Wadmalaw River, South Carolina
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Yonges Island
Click for Map
Wed -- 01:23 AM EDT     7.74 feet High Tide
Wed -- 06:15 AM EDT     Sunrise
Wed -- 07:02 AM EDT     -0.29 feet Low Tide
Wed -- 11:10 AM EDT     Moonrise
Wed -- 02:01 PM EDT     6.60 feet High Tide
Wed -- 07:15 PM EDT     0.02 feet Low Tide
Wed -- 08:32 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
77.77.56.34.32.10.4-0.30.11.22.645.36.26.66.14.62.710.10.31.32.84.3

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 (22,6,7,8)
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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.