Monday, October23, 2017 L-36.com


Marine Weather and Tides
Hilton Head Island, 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 7:32AMSunset 6:42PM Monday October 23, 2017 9:55 PM EDT (01:55 UTC) Moonrise 9:52AMMoonset 8:36PM Illumination 15% Phase: Waxing Crescent; Moon at 4 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- 857 Pm Edt Mon Oct 23 2017
.small craft advisory in effect until 5 am edt Tuesday...
Tonight..SW winds 20 to 25 kt with gusts to 30 kt, becoming W 15 kt after midnight. Seas 4 to 6 ft, subsiding to 3 to 5 ft late. A chance of tstms. Showers, mainly this evening.
Tue..W winds 10 kt. Seas 3 to 4 ft. A slight chance of showers in the morning.
Tue night..W winds 10 to 15 kt, becoming nw 15 to 20 kt after midnight. Seas 3 to 4 ft.
Wed..NW winds 15 kt with gusts to 20 kt. Seas 3 to 4 ft, subsiding to 2 to 3 ft in the afternoon.
Wed night..NW winds 15 kt. Seas 2 to 3 ft.
Thu..N winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Seas 2 to 3 ft.
Thu night..NE winds 5 to 10 kt. Seas 2 ft.
Fri..E winds 5 to 10 kt. Seas 2 ft.
Fri night..SE winds 5 to 10 kt. Seas 2 to 3 ft.
Sat..E winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of showers.
Sat night..S winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 857 Pm Edt Mon Oct 23 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will push offshore tonight, then will be followed by a stronger cold front late Tuesday and Tuesday night. High pressure will then prevail into late week before another cold front possibly affects the area this weekend.

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 240123
afdchs
area forecast discussion
national weather service charleston sc
923 pm edt Mon oct 23 2017

Synopsis
A cold front will push offshore tonight, then will be followed
by a stronger cold front late Tuesday and Tuesday night. High
pressure will then prevail into late week before another cold
front possibly affects the area this weekend.

Near term until 6 am Tuesday morning
A cold front is located just west of the forecast area this
evening with the main band of showers and thunderstorms well
ahead of it around the sc lowcountry pee dee and extending south
into the atlantic off the ga coast. The threat for severe storms
with damaging winds and or tornadoes continues with this line,
mainly in berkeley and charleston counties until 10 pm where a
tornado watch will remain in effect. Rain chances will
significantly diminish from west to east behind this main line
as much drier air filters in but some mainly light showers will
still be possible for several more hours mainly closer to the
coast until the front moves offshore later tonight. Strong cold
air advection behind the front will push temperatures into the
mid to upper 50s inland with lower to mid 60s at the coast.

Short term 6 am Tuesday morning through Thursday
The initial cold front will be offshore by daybreak Tuesday,
with significantly drier air filtering in from the west.

However, with the lack of appreciable cold air advection and
downslope flow off the surface, high temps will still climb into
the mid upper 70s.

The deep upper trough will push toward the southeast late
Tuesday, pushing a secondary dry cold front through the region
Tuesday night. This will yield low temps Wednesday and Thursday
morning in the 40s with daytime highs in the mid upper 60s.

Long term Thursday night through Monday
After another unseasonably cool start on Friday, temperatures will
moderate back closer to normal Friday afternoon into the mid 70s as
high pressure centered to the north moves offshore. A coastal trough
could develop Friday night and bring some light showers to the area.

Some uncertainty exists however beyond that time as the models
differ with respect to another cold front approaching from the west
and low pressure to the south and east. For now we stayed pretty
close to the wpc's guidance which has a cold frontal passage
Saturday night into Sunday. Temperatures will likely be near normal
through Saturday before falling below normal early next week,
possibly well below normal by Monday when some 30s are possible.

Aviation 01z Tuesday through Saturday
Gusty southwest winds near 25 kt will be possible at kchs until
about 02z. The main band of showers and thunderstorms has pushed
east of the terms but some showers and MVFR or ifr ceilings are
still possible until about 05z until drier air takes hold
behind a cold front.VFR conditions will then prevail late
tonight at both terminals as winds become westerly.

Extended aviation outlook: no significant concerns tue-sat.

Marine
This evening and tonight: south southeast winds will remain elevated
within a tight pressure gradient ahead of a cold front approaching
from the west early tonight. In general, southeast south winds will
gust near 25-30 kt, highest in nearshore south carolina waters
and offshore georgia waters. Seas will also range between 4-7
ft, highest in nearshore south carolina waters and offshore
georgia waters. For these reasons, small craft advisories will
continue for nearshore south carolina waters and offshore
georgia waters through much of tonight. Otherwise showers thunderstorms
will move through the waters ahead of an approaching cold front
this evening. The environment could support strong wind gusts
and or isolated waterspouts. The passage of the front will
result in winds becoming west-northwest late. Despite some cold
air advection behind the front, winds will decrease to around
10-15 kt late as the pressure gradient and low-level winds
diminish.

Marine conditions will temporarily improve on Tuesday, allowing
the small craft advisory for the offshore ga waters to drop
midday. However, a period of marginal SCA conditions is possible
late Tuesday night through Wednesday morning after a secondary
cold front and more significant blast of cold air advection. We
show gusts approaching 25 kt mainly over the ga waters during
this time.

Much improved conditions will return by Thursday as high pressure
builds back in and persists through Friday. Another cold front
could approach the waters Saturday but much uncertainty remains
with the forecast this weekend.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory until 5 am edt Tuesday for amz352.

Small craft advisory until 11 am edt Tuesday for amz350-374.

Near term... Rjb
short term... Jrl
long term... Rjb
aviation... Jrl rjb
marine... Dpb jrl


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 15 mi37 min SW 6 G 8 74°F 74°F1012.9 hPa
41033 20 mi47 min SW 23 G 35 75°F
ACXS1 - ACE Basin Reserve, SC 29 mi70 min S 1 75°F 1012 hPa73°F
FBIS1 - Folly Island, SC 57 mi55 min S 24 G 27 78°F 1011.6 hPa (-0.3)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 mi60 minSSW 13 G 228.00 miOvercast73°F69°F89%1012.9 hPa
Beaufort County Airport, SC15 mi80 minSW 11 G 197.00 miMostly Cloudy73°F71°F94%1011.8 hPa
Beaufort, Marine Corps Air Station, SC18 mi2 hrsS 1010.00 miThunderstorm in Vicinity76°F75°F97%1011.6 hPa
Savannah-Hilton Head International Airport, GA23 mi62 minSSW 710.00 miPartly Cloudy73°F73°F100%1012.4 hPa
Hunter U. S. Army Airfield, GA24 mi59 minS 710.00 miFair73°F69°F89%1012.1 hPa

Wind History from HXD (wind in knots)
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Last 24hrCalmCalmCalmSE33444SE6SE6
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S10S11S11S11S11S11
G20
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1 day agoNE7NE6NE76NE6NE4N6NE6N8N8NE8NE8NE8NE8NE8E6E6E7NE8N8NE5NE55Calm
2 days agoCalmCalmNE3CalmNE3NE3CalmCalmN5N5N7N7N7N7N7NE8NE10NE9----NE9NE5NE6NE7

Tide / Current Tables for Skull Creek, south entrance, Hilton Head Island, South Carolina
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Skull Creek
Click for Map
Mon -- 05:17 AM EDT     0.86 feet Low Tide
Mon -- 07:33 AM EDT     Sunrise
Mon -- 10:51 AM EDT     Moonrise
Mon -- 11:40 AM EDT     7.98 feet High Tide
Mon -- 05:56 PM EDT     1.05 feet Low Tide
Mon -- 06:41 PM EDT     Sunset
Mon -- 09:36 PM EDT     Moonset
Mon -- 11:55 PM EDT     7.16 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.26.24.83.11.70.91.12.33.95.777.87.97.36.14.52.91.51.11.62.94.55.96.9

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Mon -- 02:59 AM EDT     -1.61 knots Max Ebb
Mon -- 05:59 AM EDT     0.00 knots Slack
Mon -- 07:33 AM EDT     Sunrise
Mon -- 08:32 AM EDT     1.93 knots Max Flood
Mon -- 10:51 AM EDT     Moonrise
Mon -- 12:27 PM EDT     -0.00 knots Slack
Mon -- 04:02 PM EDT     -1.83 knots Max Ebb
Mon -- 06:41 PM EDT     0.00 knots Slack
Mon -- 06:41 PM EDT     Sunset
Mon -- 09:00 PM EDT     1.76 knots Max Flood
Mon -- 09:37 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-0-1-1.5-1.6-1.5-101.11.81.91.510.4-0.5-1.3-1.7-1.8-1.6-0.80.41.41.81.51

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 (21,6,7,8)
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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.