Wednesday, August21, 2019 L-36.com


Marine Weather and Tides
Hilton Head Island, SC

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:49AMSunset 8:02PM Wednesday August 21, 2019 11:56 AM EDT (15:56 UTC) Moonrise 10:38PMMoonset 11:07AM Illumination 65% Phase: Waning Gibbous; Moon at 21 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- 958 Am Edt Wed Aug 21 2019
Today..SW winds 5 to 10 kt, becoming S 10 to 15 kt. Seas 2 ft.
Tonight..S winds 10 kt. Seas 2 ft. A slight chance of showers and tstms after midnight.
Thu..SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Thu night..S winds 10 to 15 kt. Seas 3 ft. A slight chance of showers and tstms after midnight.
Fri..S winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Fri night..S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Sat..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Sat night..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Sun..E winds 5 to 10 kt. Seas 2 ft. Showers and tstms likely.
Sun night..SE winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 958 Am Edt Wed Aug 21 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure and an inland trough will prevail through late week. A cold front will then push into the area this weekend before stalling over or just south of the area through early next 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 211411
afdchs
area forecast discussion
national weather service charleston sc
1011 am edt Wed aug 21 2019

Synopsis
Atlantic high pressure and an inland trough will prevail
through late week. A cold front will then push into the area
this weekend before stalling over or just south of the area
through early next week.

Near term through tonight
Rest of today: ridging both surface and aloft will dominate,
while a trough at the surface prevails to the lee of the
appalachians. The combination of nva, convective temps near 90f
and a 2-3c cap will prevent showers and t-storms from developing
until around 1 pm. Thereafter, activity will form and increase
into the scattered range, mainly along the sea breeze,
differential heating boundaries from areas of morning stratus,
and the nearby proximity to the inland trough. It will also get
a boost from a subtle short wave over southwest georgia that
moves into our georgia counties during the late afternoon. We
have 30-40% probabilities most places, with the greatest chances
roughly near and inland from i-95 to near and east of us-301.

Thermodynamics and kinematics are only modest at best, so the
severe potential is close to zero. Given h85 temps around 18c,
we look for highs to peak 90-93f most places inland from the
intra-coastal. A modest resultant southerly sea breeze as high
as 12-18 mph this afternoon will hold shoreline communities to
the mid and upper 80s.

Tonight: diurnal evening convection is expected to diminish
after sunset with isolated showers and tstms possible overnight
with chances generally well below 20 percent. A weak southwest
synoptic flow will persist in the boundary layer and this
should preclude any chances for low clouds or fog and result
in yet another warm night with lows in the mid upper 70s many
areas.

Short term Thursday through Saturday
Moderate to high confidence this period. Surface troughing inland
and high pressure offshore will persist keeping the weather rather
typical for this time of year. Rain chances will be mostly confined
to the afternoon evening with a low chance of severe storms.

Probably the slightly greater risk is for heavy rainfall and
flooding given the deep moisture and generally light low-mid level
winds. Temperatures should stay above normal with heat indices
peaking in the low to mid 100s each afternoon for most areas away
from the beaches.

Long term Saturday night through Tuesday
Low confidence this period. The pattern doesn't change much until a
cold front likely pushes into the area this weekend, probably
starting Saturday night, before stalling over or near the area into
the middle of next week. Rain chances should end up being above
normal but confidence is lower regarding temperatures as much
depends on the location of the front and rain cloud coverage.

Probably the biggest issue this period will be periods of heavy rain
which could cause some flooding, especially near the coast early
next week when astronomical tides will already be higher than
normal.

Aviation 14z Wednesday through Sunday
Vfr. Afternoon showers tstms will once again develop near the
terminals this afternoon. Latest models suggest ksav has a bit
greater chance of coverage than at kchs and we maintained vcts
at ksav. At kchs, thunder is also certainty possible, however
timing and propagation factors suggest an tsra inclusions may
be better placed by the 18z cycle.

Extended aviation outlook: periodic restrictions at kchs ksav each
day through Saturday, mainly from afternoon evening showers and
thunderstorms. More significant restrictions are likely this weekend
into early next week due to increased moisture rain coverage
along with a nearby cold front.

Marine
High pressure offshore will maintain a south to southwest flow
over the local waters through tonight. This diurnal setup
should produce typical warm season results, the flow increasing
to near 15 kt after mid afternoon into the evening hours, then
tending to ebb later tonight. Seas will continue in the 2-3 ft
range.

Thursday through Monday: atlantic high pressure and an inland trough
will result in mainly south southwest winds around 15 knots or less
through the period until a cold front likely moves into and possibly
through the waters late in the weekend. The strongest winds will
likely occur near the sc coast, including charleston harbor, where
the best pressure gradient should set up. Seas will likely stay 4
feet or less, although there is more uncertainty early next week as
much depends on the strength of the winds.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term...

short term... Rjb
long term... Rjb
aviation...

marine...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 15 mi56 min SW 6 G 8.9 85°F 84°F1020.6 hPa
41033 20 mi48 min WSW 7.8 G 9.7 83°F 85°F1020 hPa
ACXS1 - ACE Basin Reserve, SC 29 mi71 min S 1.9 85°F 1020 hPa76°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 57 mi66 min SSW 3.9 G 5.8 82°F 83°F2 ft1020.2 hPa (+0.5)76°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 mi66 minSW 510.00 miPartly Cloudy86°F75°F70%1020.3 hPa
Beaufort County Airport, SC15 mi61 minWSW 67.00 miPartly Cloudy86°F73°F66%1020 hPa
Beaufort, Marine Corps Air Station, SC18 mi2 hrsSW 610.00 miFair84°F77°F80%1019.7 hPa
Savannah-Hilton Head International Airport, GA23 mi63 minWSW 410.00 miPartly Cloudy87°F73°F65%1019.9 hPa
Hunter U. S. Army Airfield, GA24 mi2 hrsW 510.00 miFair84°F75°F75%1019.6 hPa

Link to 5 minute data for KHXD

Wind History from HXD (wind in knots)
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Tide / Current Tables for Skull Creek, south entrance, Hilton Head Island, South Carolina
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Skull Creek
Click for Map
Wed -- 12:44 AM EDT     7.06 feet High Tide
Wed -- 06:49 AM EDT     0.72 feet Low Tide
Wed -- 06:51 AM EDT     Sunrise
Wed -- 12:07 PM EDT     Moonset
Wed -- 01:08 PM EDT     7.28 feet High Tide
Wed -- 07:07 PM EDT     1.34 feet Low Tide
Wed -- 08:00 PM EDT     Sunset
Wed -- 11:37 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.976.55.43.82.21.10.71.42.84.55.96.97.3764.63.11.91.41.72.74.15.4

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Wed -- 01:30 AM EDT     -0.00 knots Slack
Wed -- 04:15 AM EDT     -1.59 knots Max Ebb
Wed -- 06:51 AM EDT     Sunrise
Wed -- 07:37 AM EDT     0.00 knots Slack
Wed -- 10:16 AM EDT     1.86 knots Max Flood
Wed -- 12:07 PM EDT     Moonset
Wed -- 01:49 PM EDT     -0.00 knots Slack
Wed -- 04:31 PM EDT     -1.66 knots Max Ebb
Wed -- 08:00 PM EDT     Sunset
Wed -- 08:08 PM EDT     0.00 knots Slack
Wed -- 10:40 PM EDT     1.49 knots Max Flood
Wed -- 11:38 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.3-0.4-1.1-1.6-1.5-1.1-0.50.41.31.81.71.10.5-0.1-1-1.6-1.6-1.3-0.8-0.10.71.41.5

Weather Map and Satellite Images
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wmap_A
GOES Local Image of    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 (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.