Thursday, April27, 2017 L-36.com


Marine Weather and Tides
Hilton Head 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 6:38AMSunset 8:02PM Thursday April 27, 2017 10:20 PM EDT (02:20 UTC) Moonrise 6:47AMMoonset 8:32PM Illumination 4% Phase: Waxing Crescent; Moon at 2 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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AMZ352 Waters From Edisto Beach Sc To Savannah Ga Out 20 Nm- 936 Pm Edt Thu Apr 27 2017
Tonight..S winds 15 to 20 kt...diminishing to 15 kt late. Seas 3 to 4 ft.
Fri..S winds 5 to 10 kt. Seas 3 to 4 ft.
Fri night..S winds 15 kt. Seas 3 to 4 ft.
Sat..S winds 10 kt. Seas 3 to 4 ft.
Sat night..S winds 15 kt. Seas 3 to 4 ft.
Sun..S winds 10 to 15 kt. Seas 3 to 4 ft.
Sun night..S winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 5 ft...building to 4 to 6 ft after midnight.
Mon..S winds 15 to 20 kt. Seas 5 to 7 ft. A slight chance of showers and Thunderstorms.
Mon night..SW winds 15 to 20 kt. Seas 5 to 7 ft. A chance of showers and Thunderstorms.
Tue..W winds 10 to 15 kt. Seas 4 to 5 ft. A slight chance of showers and Thunderstorms.
Tue night..SW winds 5 to 10 kt. Seas 2 to 3 ft. Mariners are reminded that winds and seas can be higher in and near tstms.
AMZ300 936 Pm Edt Thu Apr 27 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A weak disturbance is expected to affect the area tonight...followed by high pressure Friday into the weekend. A cold front will move through Monday night...then a storm system might affect the area mid to late week.

7 Day Forecast for Marine Location Near Hilton Head Island, SC
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location: 32.22, -80.77     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 280146
afdchs
area forecast discussion
national weather service charleston sc
946 pm edt Thu apr 27 2017

Synopsis
A weak disturbance is expected to affect the area tonight, followed
by high pressure Friday into the weekend. A cold front will move
through Monday night, then a stronger storm system will affect
the area mid to late week.

Near term /until 6 am Friday morning/
Scattered convection off to the w-nw of the area should
generally remain outside the cwfa within the SW to NE steering
flow. But we have indicated isolated pop across the immediate
nw tier through midnight just in case meso-scale boundary
interactions spur a shower or t-storm. Overnight we do find
isentropic ascent and low level coastal convergence, maybe
enough to generate a few showers or t-storms brushing charleston
county, but nil pop's elsewhere.

Turbulent mixing within the boundary layer will negate the need
for any mention of fog, although there is considerable moisture
beneath a well pronounced nocturnal inversion, which will lead
to a deck of stratus. Already we're seeing indications of that
at a few sites (kssi and kgge), and more locations will start
reporting it overnight as condensation pressure deficits lower
to less than 20 or 30 mb.

It will certainly be a a warm night by april standards within a
southerly synoptic flow combined with the low stratus and/or
convective debris clouds. This will prevent temps from dropping
any lower than the mid or upper 60s, which is about 10-12f
above normal.

Short term /6 am Friday morning through Sunday/
The bermuda high will continue to expand into the forecast area
through Sunday, with onshore flow around the high maintaining low-
level moisture. This will promote a primarily rain-free but humid
pattern over the weekend. Prognosed moisture convergence near the
coast under varying levels of capping suggests a nonzero probability
for an isolated shower or two to develop dependent on the strength
of the seabreeze, but occurrence appears unlikely at this time with
the most probable outcome being a diurnal cumulus field. Under this
regime, temperatures will remain several degrees above normals, with
maximum temperatures reaching the upper 80s and lower 90s away from
the coast with minimum temperatures only in the lower 70s or upper
60s. Some uncertainty is introduced Sunday as high level clouds
ahead of a developing low pressure system appear poised to move over
the forecast area, but some model soundings indicate potential for
low-level stratus-type development early Sunday morning. Prevalent
cirrus cover would assist in mitigating this occurrence. While the
net effect on sky cover is moot, this would serve to keep maximum
temperatures a degree or two cooler than previous days.

Long term /Sunday night through Thursday/
A mature surface cyclone will lift northeast into the great
lakes region Sunday night and Monday, pushing a cold front
through the local area Monday night. A decent channel of
atmospheric moisture ahead of the front will allow scattered to
numerous showers and thunderstorms to move through Monday
afternoon and Monday night. A deeper upper trough moving through
the central united states late week will bring a stronger low
pressure system through the area, accompanied by numerous
showers and tstms.

Aviation /02z Friday through Tuesday/
MainlyVFR, although there are indications of flight
restrictions for a few hours late tonight into Friday morning
due to a low stratus deck. South winds will increase again
Friday afternoon due to MAX heating and enhancement from the sea
breeze circulation.

Extended aviation outlook: flight restrictions due to low ceilings
will be possible at either terminal Friday and Saturday nights,
possibly persisting into early the following morning. Ceiling and/or
vsby restrictions will again be possible Monday into Monday night
due to scattered showers and/or thunderstorms.

Marine
A cold front will stretch across the appalachians overnight.

The pressure gradient between this front and atlantic high
pressure will equate to southerly winds increasing to 15-20 kt
across most of the coastal waters, then easing a bit late. As a
result, wave heights will average 3-5 ft.

Generally onshore flow averaging 10-15 kts will persist through the
weekend, though winds nearest the coast may veer southwest or even
west-southwest each night as a land breeze develops after sunset.

Seas will generally remain 2-4 feet through the period. A cold front
will approach the region Sunday into Monday, and flow will increase
in advance of its arrival, building some 5-6 feet seas offshore as
early as Sunday, with small craft advisory conditions arriving over
most of the waters Sunday night, persisting into Monday night.

Rip currents... The combination of swell impacting the beaches, an
afternoon sea breeze, and astronomical influences will generate
a moderate risk of rip currents along southeast south carolina
beaches Friday, with a low risk for our georgia beaches.

Tides/coastal flooding
Coastal flood advisories are in effect this evening, thanks to
previously elevated tides, moderate onshore winds and the recent
perigean spring tide cycle.

Elevated tides are expected to continue through Saturday, so
more advisories will likely be needed with each evening high
tide.

Chs watches/warnings/advisories
Ga... Coastal flood advisory until 11 pm edt this evening for gaz117-
119-139-141.

Sc... Coastal flood advisory until 11 pm edt this evening for
scz048>051.

Marine... None.

Near term...

short term...

long term... Jrl
aviation...

marine...

tides/coastal flooding...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 15 mi50 min SSW 8 G 13 75°F 74°F1013.1 hPa
41033 20 mi72 min S 14 G 19 74°F 72°F1011.9 hPa
ACXS1 - ACE Basin Reserve, SC 29 mi95 min S 1 76°F 1012 hPa69°F
FBIS1 - Folly Island, SC 57 mi80 min S 16 G 18 74°F 1012.6 hPa (-0.9)73°F

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilton Head Island, Hilton Head Airport, SC4 mi25 minS 9 G 1710.00 miFair75°F71°F89%1013.5 hPa
Beaufort County Airport, SC15 mi25 minS 10 G 167.00 miFair73°F69°F89%1013.2 hPa
Beaufort, Marine Corps Air Station, SC18 mi24 minS 910.00 miFair77°F68°F74%1013.4 hPa
Savannah, Savannah International Airport, GA23 mi27 minS 1210.00 miMostly Cloudy76°F66°F72%1013.2 hPa
Hunter U. S. Army Airfield, GA24 mi82 minS 510.00 miFair77°F70°F80%1011.8 hPa

Wind History from HXD (wind in knots)
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1 day agoCalmCalmCalmCalmCalmS3SW6SW5SW5SW8CalmN5S8S8SE10SE10--SE6
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--NW8NW8W12W10W6NW7W6--SW8S8S8S5CalmS3Calm

Tide / Current Tables for Skull Creek, south entrance, Hilton Head Island, South Carolina
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Skull Creek
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Thu -- 04:01 AM EDT     -1.10 feet Low Tide
Thu -- 06:40 AM EDT     Sunrise
Thu -- 07:47 AM EDT     Moonrise
Thu -- 10:04 AM EDT     8.10 feet High Tide
Thu -- 04:15 PM EDT     -1.33 feet Low Tide
Thu -- 08:01 PM EDT     Sunset
Thu -- 09:32 PM EDT     Moonset
Thu -- 10:23 PM EDT     9.33 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.341.6-0.3-1.1-0.41.43.867.58.17.76.34.32-0.1-1.3-0.90.93.56.28.29.29.1

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Thu -- 01:19 AM EDT     -2.73 knots Max Ebb
Thu -- 04:33 AM EDT     0.00 knots Slack
Thu -- 06:41 AM EDT     Sunrise
Thu -- 07:06 AM EDT     2.52 knots Max Flood
Thu -- 07:48 AM EDT     Moonrise
Thu -- 10:43 AM EDT     -0.01 knots Slack
Thu -- 01:46 PM EDT     -2.51 knots Max Ebb
Thu -- 04:43 PM EDT     0.00 knots Slack
Thu -- 07:25 PM EDT     3.02 knots Max Flood
Thu -- 08:01 PM EDT     Sunset
Thu -- 09:32 PM EDT     Moonset
Thu -- 11:05 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2.2-2.7-2.6-2.1-0.90.722.52.31.60.8-0.4-1.6-2.4-2.5-2.2-1.10.52.12.92.92.21.30.1

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.