Saturday, August19, 2017 L-36.com


Marine Weather and Tides
Skidaway 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 6:50AMSunset 8:03PM Saturday August 19, 2017 1:40 AM EDT (05:40 UTC) Moonrise 3:28AMMoonset 5:34PM Illumination 10% Phase: Waning Crescent; Moon at 27 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- 1241 Am Edt Sat Aug 19 2017
Rest of tonight..S winds 15 kt, becoming sw. Seas 2 to 3 ft. A slight chance of showers and tstms.
Sat..SW winds 5 to 10 kt, becoming S 10 to 15 kt in the afternoon. Seas 2 to 3 ft. A slight chance of showers and tstms.
Sat night..S winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Sun..SW winds 5 to 10 kt, becoming S in the afternoon. Seas 2 ft. A slight chance of showers and tstms.
Sun night..S winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Mon..SE winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms in the morning, then a chance of showers and tstms in the afternoon.
Mon night..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms, mainly in the evening.
Tue..S winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Tue night..S winds 10 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Wed..SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Wed night..SW winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 1241 Am Edt Sat Aug 19 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure will remain in control through early next week. A cold front may affect the area during the middle of next week.

7 Day Forecast for Marine Location Near Skidaway Island, GA
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location: 31.91, -81.06     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 190528
afdchs
area forecast discussion
national weather service charleston sc
128 am edt Sat aug 19 2017

Synopsis
Atlantic high pressure will remain in control through early
next week. A cold front may affect the area during the middle
of next week.

Near term until 6 am this morning
Very subtle isentropic ascent plus the proximity to a
deformation zone near the coast will produce scattered
stratocumulus clouds around 6-7k ft through the rest of the
night. Nocturnal convection could form closer to daybreak, but
the best convergence instability will stay offshore, so only 10%
pop's or less over land areas through 6 am. Temps will struggle
to dip below 870f in many places, and in fact some of the
barrier islands and downtown charleston (unless they receive
isolated convection) will only reach 80-82f with breezy winds
from off to ocean to persist.

Short term 6 am this morning through Monday
A broad upper ridge will remain across the southeast united
states through the weekend, maintaining hot and muggy
conditions. A decent mid-level cap and weak afternoon sea
breeze will only allow isolated afternoon showers and tstms to
develop. Slightly higher high temps will be inland while the
highest dewpoints will be closer to the coast. The result will
be heat index values topping out 103-107f both days.

On Monday, the broad 500 mb ridge will persist across the
southeast united states and into the western and central
atlantic. However, both the GFS and ECMWF now feature a weak
tropical wave (currently north of the bahamas) drifting slowly
wnw toward the area. There are no signs of tropical development
of this wave, though it is expected to spread increasing
atlantic moisture into the area Monday afternoon. This may yield
a modest increase in potential afternoon showers and tstms.

Additionally, sky cover may be somewhat greater Monday due to
greater mid and high level moisture. Highs will be in the lower
90s with heat indices 100-103f.

Long term Monday night through Friday
Very strong upper ridging will prevail into Tuesday before a trough
and cold front move in for the middle to latter portion of the week.

This will lead to increasingly unsettled weather toward mid week,
especially Thursday as the front moves into the area. Temperatures
should remain above normal through the period, except possibly
Thursday depending on the location of the front.

Aviation 06z Saturday through Wednesday
Vfr with no concerns through about 16-18z Saturday, before
isolated to scattered shra tsra develops on the sea breeze. This
boundary will be near both kchs and ksav from around 19-23z,
and it is during this time that brief flight restrictions can
occur. For now vcts with CB clouds will suffice at both
terminals during the mid afternoon through early evening.

Extended aviation outlook: main concern through Wednesday is
showers and thunderstorms, mainly each afternoon early evening.

Marine
Tonight: winds seas are expected to remain below small craft
advisory levels, but there should be a fair pressure gradient and
nocturnal surge over the waters between a trough of low pressure
inland and high pressure offshore. In general, south-southwest winds
will peak near 15-20 kts, highest in south carolina waters where
a few gusts to 25 kt can occur. Seas will average 2-4 ft.

Saturday through Wednesday: the coastal waters will remain
between an inland trough and offshore high pressure through
Saturday night which will keep a tighter than normal pressure
gradient in place. Winds could push 20 knots at times but this
is just below advisory levels. A weakening cold front will then
approach early next week but likely stall out and never make it
through the area with winds generally remaining 15 knots or
less. Seas will mostly be 4 feet or less, highest near the gulf
stream.

Tides coastal flooding
Astronomical influences will lead to a round of elevated tides
into early next week. Only small tidal departures are necessary
and we could approach shallow coastal flooding levels with the
evening high tides, mainly Sunday through Tuesday along the sc
coast.

Climate
Record high minimums for 18 august...

kchs 78 2010... Preliminary low for Friday was 80.

Kcxm 82 1998
ksav 78 2010
record high minimums for 19 august...

kchs 79 2010
kcxm 81 2009
ksav 79 1878

Equipment
The temperature and dew point sensors at the downtown charleston
observation site (kcxm) could periodically fail. Technicians
are working to resolve the problem.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term...

short term...

long term...

aviation...

marine...

tides coastal flooding...

climate...

equipment...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 12 mi41 min SW 6 G 8.9 81°F 87°F1015.4 hPa (+0.7)
SAXG1 - Sapelo Island Reserve, GA 36 mi41 min WSW 7 80°F 1016 hPa (+1.0)76°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 37 mi51 min SSW 12 G 14 85°F 85°F2 ft1015 hPa (+0.6)77°F
41033 43 mi33 min SW 16 G 19 85°F 1014.3 hPa

Wind History for Fort Pulaski, GA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hunter U. S. Army Airfield, GA10 mi1.7 hrsSSW 610.00 miFair81°F75°F84%1014.1 hPa
Savannah-Hilton Head International Airport, GA18 mi48 minSSW 810.00 miPartly Cloudy81°F73°F77%1015 hPa

Wind History from SVN (wind in knots)
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Last 24hrS4SW4SW6W6--SW4W5NW8NW5N5SW3W5W6S7S11S9
G17
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1 day agoW3CalmCalmCalmCalmW3W5W4W5NW6NW4S6S6S7S6S8----S9SW9S3SW5--S3
2 days agoW6W6W5SW3SW4W5NW5W5W4W5W5SW9W7CalmW7W6NW10S7S5S5S5SW4CalmSW5

Tide / Current Tables for Vernon View, Burnside River, Georgia
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Vernon View
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Sat -- 01:07 AM EDT     0.12 feet Low Tide
Sat -- 04:28 AM EDT     Moonrise
Sat -- 06:51 AM EDT     Sunrise
Sat -- 07:09 AM EDT     7.87 feet High Tide
Sat -- 01:19 PM EDT     -0.62 feet Low Tide
Sat -- 06:33 PM EDT     Moonset
Sat -- 07:37 PM EDT     9.30 feet High Tide
Sat -- 08:03 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.10.623.95.87.37.97.56.44.62.50.6-0.5-0.31.23.55.97.99.19.28.36.74.7

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Sat -- 01:43 AM EDT     0.01 knots Slack
Sat -- 04:10 AM EDT     1.73 knots Max Flood
Sat -- 04:26 AM EDT     Moonrise
Sat -- 06:50 AM EDT     Sunrise
Sat -- 07:50 AM EDT     -0.00 knots Slack
Sat -- 11:21 AM EDT     -2.16 knots Max Ebb
Sat -- 01:48 PM EDT     0.01 knots Slack
Sat -- 04:33 PM EDT     2.45 knots Max Flood
Sat -- 06:33 PM EDT     Moonset
Sat -- 08:02 PM EDT     Sunset
Sat -- 08:23 PM EDT     -0.00 knots Slack
Sat -- 11:56 PM EDT     -2.44 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2-10.41.41.71.61.40.8-0.2-1.2-1.8-2.1-2-1.10.31.62.42.42.11.50.5-0.7-1.7-2.2

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 (1,6,7,8)
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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.