Saturday, October21, 2017 L-36.com


Marine Weather and Tides
Whitemarsh Island, GA

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 7:31AMSunset 6:45PM Saturday October 21, 2017 11:47 AM EDT (15:47 UTC) Moonrise 8:05AMMoonset 7:17PM Illumination 2% Phase: Waxing Crescent; Moon at 1 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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AMZ354 Waters From Savannah Ga To Altamaha Sound Ga Out 20 Nm, Including Grays Reef National Marine Sanctuary- 1120 Am Edt Sat Oct 21 2017
Rest of today..NE winds 15 kt, becoming E 15 to 20 kt. Seas 3 to 4 ft.
Tonight..E winds 15 to 20 kt. Seas 3 to 4 ft. A slight chance of showers after midnight.
Sun..E winds 15 kt. Seas 4 to 5 ft. A chance of showers. A slight chance of tstms in the afternoon.
Sun night..E winds 15 kt. Seas 4 to 5 ft. A chance of showers with a slight chance of tstms.
Mon..SE winds 15 kt. Seas 4 to 5 ft. Showers likely with a slight chance of tstms.
Mon 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. Showers with a chance of tstms.
Tue..SW winds 15 to 20 kt. Seas 4 to 5 ft. A chance of showers.
Tue night..W winds 10 to 15 kt. Seas 3 to 4 ft.
Wed..NW winds 10 to 15 kt. Seas 3 to 4 ft.
Wed night..NW winds 15 kt. Seas 2 to 3 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 1120 Am Edt Sat Oct 21 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Strong high pressure will shift offshore this weekend. A cold front will then move through Monday night into Tuesday with a stronger but dry cold front to move through Tuesday night. High pressure will then prevail into late next week.

7 Day Forecast for Marine Location Near Whitemarsh Island, GA
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location: 32.08, -81.03     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 211505
afdchs
area forecast discussion
national weather service charleston sc
1105 am edt Sat oct 21 2017

Synopsis
Strong high pressure will shift offshore this weekend. A cold
front will then move through Monday night into Tuesday with a
stronger but dry cold front to move through Tuesday night. High
pressure will then prevail into late next week.

Near term through tonight
Today: at the sfc, dry high pressure centered to the north will
shift off the mid-atlantic coast. Aloft, a large ridge of high
pressure will remain centered over the southeast united states. The
pattern will result in conditions quite similar to those that were
experienced yesterday. However, some high clouds will begin to
filter into the region from the west well ahead of a low pressure
system shifting over the central united states. Although clouds
should limit overall heating potential, afternoon highs are still
expected to reach the lower 80s away from the immediate coast. Dry
conditions will likely prevail over all areas through at least
evening hours.

Tonight: the center of a large sfc high will continue pushing
northeast and away from the region. However, the pattern across
the forecast area will remain under ridging and the pressure
gradient should increase slightly. The sfc pattern is expected
to support backing winds from the east-northeast overnight.

Overnight lows should range around 60 inland to near 70 close to
the beaches.

Short term Sunday through Tuesday
A coastal trough will push inland across the area Sunday and the
associated isentropic ascent, low-level convergence and moisture
will lead to some showers. The trough should move well inland and
dissipate by Sunday night but strengthening low-level onshore flow
and deeper moisture moving in from the southwest ahead of an
approaching cold front upper trough will cause an increase in rain
chances amounts Sunday night and especially Monday Monday night.

Although low-level shear helicity will be on the increase Monday,
instability will likely be marginal and thus the risk for severe
thunderstorms is low. Temperatures will remain above normal through
the period, even through Tuesday given the downslope winds and
slacking cold advection.

Long term Tuesday night through Friday
A strong cold front will move through Tuesday night as a broad upper
trough envelopes the eastern u.S. Dry, but cooler conditions will
then prevail through Thursday before some moderation occurs late in
the week as high pressure quickly shifts offshore allowing a milder
return flow to set up. Some uncertainty in the longer range model
guidance implies lower forecast confidence late next week but could
see some rain return to the area Saturday. Temperatures will be
mostly below normal through Thursday night before possibly rising
closer to or even above normal through the end of the week. Some
inland locales should get into the 40s each morning from Wednesday
through Friday.

Aviation 15z Saturday through Wednesday
Vfr conditions will prevail at both kchs and ksav through 12z
Sunday. Mid and high clouds will increase from few this morning
to sct to bkn by 12z Sunday.

Extended aviation outlook: brief flight restrictions are possible
Sunday due to low clouds light showers. Higher chances of flight
restrictions are expected Sunday night into Tuesday as a cold front
affects the area with heavier showers and potentially some
thunderstorms. Breezy gusty winds also possible
Tuesday Wednesday.

Marine
Today and tonight: sfc high pressure centered north of the area will
shift east off the mid-atlantic coast this afternoon, before
continuing to the northeast overnight. Winds seas will remain below
small craft advisory levels today, but an uptick in winds seas is
anticipated this evening and overnight as a slight pinching of the
gradient occurs over local waters. In general, east northeast winds
should approach 15-20 kt over most waters outside the charleston
harbor today while gusts up to 25 kt are possible over offshore
georgia waters late tonight. Seas will build from 2-3 ft today
to 3-4 ft tonight in nearshore waters and 3-4 ft today to 4-6 ft
late tonight in offshore georgia waters. A small craft advisory
will likely be needed at some point late tonight in offshore
georgia waters.

Sunday through Thursday: conditions will deteriorate a bit this
weekend as a cold front approaches from the west and likely moves
through early Tuesday. Another stronger cold front will then move
through Tuesday night. A small craft advisory will likely be needed
for the nearshore offshore waters Monday into Tuesday and into
Wednesday morning beyond 20 nm as seas reach 6+ feet.

Rip currents... Onshore winds, small swells, and lingering astronomical
influences will support a moderate risk of rip currents at the ga
beaches today. Conditions will be close to a moderate risk on
the sc beaches, but the wind speed is a little less than further
south, so a low risk is maintained for now.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 7 mi48 min NE 8.9 G 11 74°F 73°F1025.7 hPa (+1.4)
41033 36 mi40 min NE 12 G 16 73°F
ACXS1 - ACE Basin Reserve, SC 45 mi63 min NNE 2.9 74°F 1026 hPa62°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 48 mi58 min NE 18 G 21 75°F 77°F4 ft1023.6 hPa (+1.2)67°F

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hunter U. S. Army Airfield, GA7 mi52 minNE 610.00 miFair77°F63°F64%1024.6 hPa
Savannah-Hilton Head International Airport, GA10 mi55 minNE 610.00 miMostly Cloudy77°F61°F58%1025.4 hPa
Hilton Head Island, Hilton Head Airport, SC20 mi61 minN 710.00 miClear73°F62°F69%0 hPa

Wind History from SVN (wind in knots)
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Last 24hrN4NE6E8E7SE5E7E8SE5SE4CalmCalmCalmCalmCalmNE3CalmCalmCalmNE3CalmN3NE4NE4NE6
1 day agoNE7NE9NE7NE8E3NE7E8E5E5E3NE3NE3NE3CalmN3N4N3N4N3N5N4N6N7NE10
2 days agoNE10NE8NE6NE6NE8NE8E7E5NE4NE4N5N5N7N5NE5NE6NE4N5N5NE4N7NE7NE9NE9

Tide / Current Tables for Fort Jackson, Savannah River, Georgia
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Fort Jackson
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Sat -- 04:25 AM EDT     0.03 feet Low Tide
Sat -- 07:32 AM EDT     Sunrise
Sat -- 09:05 AM EDT     Moonrise
Sat -- 10:16 AM EDT     8.67 feet High Tide
Sat -- 04:55 PM EDT     0.15 feet Low Tide
Sat -- 06:44 PM EDT     Sunset
Sat -- 08:17 PM EDT     Moonset
Sat -- 10:20 PM EDT     8.13 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.44.62.81.20.20.31.846.388.68.57.664.12.30.80.2135.37.28.17.9

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Sat -- 02:11 AM EDT     -1.94 knots Max Ebb
Sat -- 04:41 AM EDT     0.01 knots Slack
Sat -- 07:17 AM EDT     2.11 knots Max Flood
Sat -- 07:31 AM EDT     Sunrise
Sat -- 09:04 AM EDT     Moonrise
Sat -- 11:07 AM EDT     -0.00 knots Slack
Sat -- 02:47 PM EDT     -2.24 knots Max Ebb
Sat -- 05:19 PM EDT     0.01 knots Slack
Sat -- 06:43 PM EDT     Sunset
Sat -- 07:43 PM EDT     1.97 knots Max Flood
Sat -- 08:16 PM EDT     Moonset
Sat -- 11:20 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.3-1.7-1.9-1.8-0.90.41.62.121.61.10.1-0.9-1.7-2.1-2.2-1.7-0.50.91.81.91.61.10.3

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 (11,2,3,4)
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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.