Friday, June23, 2017 L-36.com


Marine Weather and Tides
Hilton Head Island, SC

Version 3.4
What's New / NOTES
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 6:16AMSunset 8:34PM Friday June 23, 2017 4:53 PM EDT (20:53 UTC) Moonrise 4:55AMMoonset 7:09PM Illumination 0% Phase: New Moon; Moon at 29 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- 343 Pm Edt Fri Jun 23 2017
Tonight..S winds 20 kt...becoming sw 15 to 20 kt late. Seas 4 to 5 ft.
Sat..SW winds 15 to 20 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft in the afternoon.
Sat night..SW winds 15 to 20 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft after midnight. A chance of showers and tstms.
Sun..SW winds 10 to 15 kt. Seas 3 to 4 ft, subsiding to 2 to 3 ft in the afternoon. Showers and tstms likely.
Sun night..SW winds 5 to 10 kt. Seas 2 ft. Showers and tstms likely.
Mon..N winds 5 kt, becoming ne in the afternoon. Seas 2 ft. Showers and tstms likely, mainly in the morning.
Mon night..E winds 5 kt, becoming W after midnight. Seas 2 ft. A chance of showers and tstms.
Tue..N winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Tue night..NE winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Wed..NE winds 10 to 15 kt. Seas 2 to 3 ft.
Wed night..E winds 10 to 15 kt. Seas 3 ft. A slight chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 343 Pm Edt Fri Jun 23 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will gradually move through the area this weekend, moving off the coast Monday. Drier high pressure will build in from the northwest for much of next week before moving offshore 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 232003
afdchs
area forecast discussion
national weather service charleston sc
403 pm edt Fri jun 23 2017

Synopsis
A cold front will gradually move through the area this weekend,
moving off the coast Monday. Drier high pressure will build in
from the northwest for much of next week before moving offshore
late week.

Near term until 6 am Saturday morning
Atlantic high pressure will continue to stretch westward
across much of the area while troughing approaches from the
northwest as the remnants of cindy move northeast toward the mid-
atlantic region. Much of the lingering showers thunderstorms will
end this evening with the loss of daytime heating and sea breeze
forcing. Some convection may develop near the sc coast late as
moisture convergence increases. Otherwise expect generally partly
cloudy skies and mild temperatures in the mid to upper 70s for most
locales. The record high minimum temperatures of 79 degrees may be
challenged at kchs ksav, although probably more likely at kchs.

Short term 6 am Saturday morning through Monday
A broad upper trough will persist across the central united
states while a cold front gradually sinks southeast into the
area. Most of the upper shortwave energy will remain to the
northwest of the area Saturday into Sunday. However, deep
tropical moisture will spread across the area with precipitable
water values 2.0-2.2" during the period.

Given the deep wsw flow in the lowest 500 mb of the atmosphere
on Saturday, the morning will be mostly dry. The best chance for
precipitation will come later in the afternoon as the cold front
begins to approach. We held the pops until the latter half of
the afternoon with the highest values farther inland. The
ensuing morning subsidence should allow for considerable
sunshine and the development of moderate surface-based
instability. 0-6 km bulk shear vectors increase to around 25 kt
late in the afternoon farther inland with capes 2500-3000 j kg.

Some organized thunderstorms may move into our area late in the
afternoon or during the evening with at least some damaging wind
potential.

The cold front will stall out along our coast on Sunday while
deep moisture persists. Greater cloud cover in the morning
should somewhat limit instability, and with the greatest upper
forcing remaining to the northwest, convergence will primarily
be driven by the nearby cold front. Fairly good coverage of
showers and tstms expected, especially closer to the coast.

Low to mid 60s dewpoints are progged to move into inland areas
on Monday as drier high pressure gradually builds southeast. The
front will slowly drift southeast, though sticking around long
enough to maintain at least isolated showers and tstms over
coastal areas and the adjacent atlantic waters.

Long term Monday night through Friday
Monday night the cold front will be offshore of our area, dissipating
as it moves further away. Meanwhile, high pressure from the
central u.S. Will gradually be building towards our area. The
high is expected to pass north of our area Wednesday, then move
offshore Thursday. Dry conditions are expected for most of the
land area. The only shower threat appears to be over the coastal
waters each night and maybe along portions of the immediate
coast. Temperatures will be slightly below normal through
Wednesday, then creeping up on Thursday.

Aviation 20z Friday through Wednesday
Vfr. Some showers tstms are expected to develop inland this
afternoon but chances of significant impacts at the terms are
too low to mention.

Extended aviation outlook: periods of flight restrictions are
expected late Saturday into Monday due to a cold front slowly moving
through the area.

Marine
Tonight: atlantic high pressure will hang on to the east while
the remnants of tropical cyclone cindy move northeast toward the
mid-atlantic region. This will set up a pressure pattern
favorable for increasing south southwest winds, generally
highest across the charleston county waters where the best
gradient jetting is likely. Think winds will gust near 25 kt
across this area along with seas building to 6 ft toward 20 nm
offshore and thus an advisory will remain in effect for this
area. Conditions will be close to advisory thresholds
elsewhere as well but confidence in coverage duration of
criteria is low.

Saturday, a tightening gradient ahead of a cold front will
maintain 25 kt gusts and 6 ft seas over portions of the
charleston nearshore. Thus a small craft advisory persists
through Saturday evening. Our forecast wind gusts in charleston
harbor for Saturday afternoon are currently just shy of small
craft advisory given gusts of 22-23 kt when the sea breeze
enhances the existing flow.

Winds and seas will diminish considerably later Saturday night
through the middle of next week as the cold front drops south
and high pressure gradually expands southeast.

Rip currents: the combination of breezy conditions in the surf
zone and influences from the new moon, lunar perigee and ongoing
elevated tides will support a moderate risk for rip currents
through Saturday. An elevated risk for rip currents will be
possible again Sunday.

Tides coastal flooding
A coastal flood advisory may be needed for portions of the lower
south carolina coast during the evening high tide cycle.

Tides will continue to run a little high through Monday due to
various astronomical influences. Fortunately the wind directions
are not very conducive to much surge so we still might only
barely touch 7 ft mllw at charleston harbor during some of the
evening tides.

Climate
Record high minimums for 24 june:
kchs 79 2016.

Kcxm 85 1998.

Ksav 79 1932.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory from 8 pm this evening to 2 am edt Sunday
for amz350.

Near term... Rjb
short term... Jrl
long term...

aviation... Jrl rjb
marine... Jrl rjb
tides coastal flooding...

climate...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 15 mi54 min S 8 G 11 85°F 84°F1016 hPa (-1.4)
41033 20 mi46 min SSW 18 G 23 82°F 83°F1015.4 hPa
ACXS1 - ACE Basin Reserve, SC 29 mi69 min S 1.9 86°F 1016 hPa78°F
FBIS1 - Folly Island, SC 57 mi54 min SSW 16 G 18 82°F 1016.7 hPa (-1.4)76°F

Wind History for Fort Pulaski, GA
(wind in knots)    EDIT      (on/off)   Help
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Last
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S6
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NE1
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hilton Head Island, Hilton Head Airport, SC4 mi64 minS 1210.00 miPartly Cloudy86°F77°F75%1016.3 hPa
Beaufort County Airport, SC15 mi59 minS 11 G 167.00 miPartly Cloudy86°F77°F75%1015.2 hPa
Beaufort, Marine Corps Air Station, SC18 mi58 minSSE 9 G 1610.00 miPartly Cloudy86°F80°F83%1015.3 hPa
Savannah-Hilton Head International Airport, GA23 mi61 minS 1210.00 miMostly Cloudy93°F73°F54%1015.2 hPa
Hunter U. S. Army Airfield, GA24 mi1.9 hrsSSE 410.00 miA Few Clouds89°F77°F68%1015.5 hPa

Wind History from HXD (wind in knots)
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Last 24hr--S8S7S6S7
G12
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S7S9S10S8S11S7S10
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1 day agoS4CalmCalmCalmCalmCalmCalmSE4S76
G14
S8S6
G12
S7S7S8S8--S12S9S9S9S8S10S10
2 days ago--SW6SW6CalmCalmNE4Calm33CalmCalmS6S6
G11
S7
G13
S6S6S6S8SE8SE8SE8SE10S8S8

Tide / Current Tables for Skull Creek, south entrance, Hilton Head Island, South Carolina
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Skull Creek
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Fri -- 02:31 AM EDT     -0.73 feet Low Tide
Fri -- 05:55 AM EDT     Moonrise
Fri -- 06:17 AM EDT     Sunrise
Fri -- 08:30 AM EDT     7.64 feet High Tide
Fri -- 02:42 PM EDT     -1.35 feet Low Tide
Fri -- 08:09 PM EDT     Moonset
Fri -- 08:33 PM EDT     Sunset
Fri -- 08:56 PM EDT     9.34 feet High Tide
Fri -- 10:32 PM EDT     New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.90.8-0.5-0.60.62.64.86.67.57.56.54.92.80.6-1-1.3-0.12.14.87.38.89.38.77.2

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Fri -- 12:13 AM EDT     -2.50 knots Max Ebb
Fri -- 03:08 AM EDT     0.01 knots Slack
Fri -- 05:35 AM EDT     2.06 knots Max Flood
Fri -- 05:56 AM EDT     Moonrise
Fri -- 06:18 AM EDT     Sunrise
Fri -- 09:13 AM EDT     -0.00 knots Slack
Fri -- 12:28 PM EDT     -2.26 knots Max Ebb
Fri -- 03:11 PM EDT     0.01 knots Slack
Fri -- 05:56 PM EDT     2.83 knots Max Flood
Fri -- 08:09 PM EDT     Moonset
Fri -- 08:32 PM EDT     Sunset
Fri -- 09:43 PM EDT     -0.00 knots Slack
Fri -- 10:32 PM EDT     New Moon
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2.5-2.3-1.6-0.21.21.921.71.10.3-0.9-1.8-2.2-2.2-1.6-0.31.32.52.82.51.90.9-0.4-1.6

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 (16,3,4,5)
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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.