Thursday, August17, 2017 L-36.com


Marine Weather and Tides
Isle of Hope, 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 6:49AMSunset 8:06PM Thursday August 17, 2017 9:09 PM EDT (01:09 UTC) Moonrise 1:28AMMoonset 3:40PM Illumination 19% Phase: Waning Crescent; Moon at 25 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- 645 Pm Edt Thu Aug 17 2017
Tonight..SW winds 10 to 15 kt. Seas 1 foot. A slight chance of showers and tstms.
Fri..SW winds 5 to 10 kt, becoming S 10 to 15 kt in the afternoon. Seas 2 ft. A slight chance of tstms. A slight chance of showers.
Fri night..SW winds 10 to 15 kt. Seas 2 ft. A slight chance of showers and tstms in the evening, then a chance of showers and tstms after midnight.
Sat..SW winds 10 to 15 kt. Seas 2 ft. A slight chance of showers and tstms in the morning, then a chance of showers and tstms in the afternoon.
Sat night..S winds 10 to 15 kt. Seas 3 ft. A chance of showers and tstms.
Sun..S winds 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Sun night..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms, mainly in the evening.
Mon..S winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Mon night..S winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Tue..S winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Tue night..S winds 10 kt. Seas 2 to 3 ft. A slight chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 645 Pm Edt Thu Aug 17 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. Atlantic high pressure will remain in control as troughing persists inland through late this week. A cold front will dissipate as it approaches the area this weekend. High pressure will return early next week. Another cold front will approach during the middle of next week.

7 Day Forecast for Marine Location Near Isle of Hope, GA
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location: 31.98, -81.05     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 172254
afdchs
area forecast discussion
national weather service charleston sc
654 pm edt Thu aug 17 2017

Synopsis
Atlantic high pressure will remain in control as troughing
persists inland through late this week. A cold front will
dissipate as it approaches the area this weekend. High pressure
will return early next week. Another cold front will approach
during the middle of next week.

Near term until 6 am Friday morning
Convection has recently increased in coverage around ludowici in
the wake of the sea breeze. Increased pops to 40% across
portions of mcintosh, long and liberty counties. Convection
should gradually diminish over the next few hours as instability
wanes. Expect dry conditions to prevail overnight. Debris high
cloudiness across the coast will gradually thin with time, with
mostly clear conditions prevailing all areas after midnight.

Short term 6 am Friday morning through Sunday
The area will remain sandwiched between a ridge over the
northern gulf and a ridge over the western atlantic on Friday. A
weak upper trough will remain to our west though the greatest
shortwave energy will remain west of the area. Isolated to
scattered mainly afternoon convection is expected, focused along
the sea breeze. Highs will top out in the middle 90s though
dewpoints are expected to partially mix out during the afternoon
so heat indices are currently forecast in the 105-109f range.

Saturday the upper trough shifts slightly east, allowing some
shortwave energy to move into the area during the afternoon.

Ample instability will exist for scattered showers and tstms
late morning through early evening. Greater cloud coverage will
shave a degree or two off afternoon high temps as well as bump
maximum heat indices down a bit. Nevertheless, it will continue
to be quite hot and humid.

Sunday looks fairly similar to Saturday though the upper ridge
will gradually rebuild. Scattered daytime convection is
anticipated though coverage may be a bit lower than Saturday.

Highs again in the middle 90s.

Long term Sunday night through Thursday
Abnormally strong mid level ridging will prevail Monday and Tuesday
before a broad long wave trough develops over a good portion of
the eastern states during the middle of the week. Simultaneously
at the surface the sub-tropical ridge will persist as a lee
side trough redevelops for Monday and Tuesday, but with
diminishing heights aloft and the formation of the large scale
trough, a cold front will attempt to approach late in the
forecast period. Plenty of moisture and modest thermodynamics
will support at least scattered coverage of showers and t-storms
through the period. Temps will remain above august norms. There
are currently no strong indications that shower tstorm coverage
on Monday will be any greater than a typical summer day due to
the building upper ridge and fact that the approaching cold
front will dissipate before it approaches.

Aviation 00z Friday through Tuesday
Primary concerns:
* none -VFR.

Scattered showers tstms are likely again Friday afternoon, but
impact probabilities are too low this far out to include a
mention at either kchs or ksav for the 00z TAF cycle.

Extended aviation outlook: shower tstms possible each afternoon.

Marine
The low level ridge axis remains well off to the south and
southeast of the waters through tonight and a typical warm
season regime of south to southwest synoptic flow will persist
over the waters. Overnight surges should not amount to more
than 15 kt on average with seas still in the 2 to 3 ft range
overall.

Winds over the coastal waters will be stronger Friday through
Saturday, especially across the nearshore waters due to a
tighter gradient along the western periphery of the atlantic
high. The afternoon sea breeze could see winds gusting to 20 kt
along the sc coast. Seas will briefly build to as high as 4 ft
over the waters.

Sunday through Tuesday we expect winds seas to decrease in
response to expanding atlantic high pressure.

Tides coastal flooding
Astronomical influences will lead to a round of elevated tides
this weekend into early next week. Only small tidal departures
are necessary and we could approach shallow coastal flooding
levels, especially over parts of the sc coast, including
downtown charleston.

Climate
Record high minimums for 17 august...

kchs 78 2010 <--- low today 80, record preliminarily broken.

Kcxm 82 2010
ksav 78 1995 <--- low today 78, record preliminarily tied.

Record high minimums for 18 august...

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

kchs 79 2010
kcxm 81 2009
ksav 79 1878

Equipment
The temperature sensor at the downtown charleston observation site
(kcxm) has failed. Technicians are working to resolve the problem.

Temperature and dewpoint data will not be available until the sensor
is replaced.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 9 mi52 min SW 8 G 12 86°F 86°F1015.9 hPa
41033 40 mi62 min SSW 12 G 16 87°F 1014.9 hPa
SAXG1 - Sapelo Island Reserve, GA 41 mi70 min Calm 85°F 1016 hPa (+1.0)80°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 41 mi80 min SSW 12 G 12 86°F 86°F1 ft1015.5 hPa (+0.4)78°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, GA6 mi3.2 hrsSSW 810.00 miFair91°F75°F62%1014.5 hPa
Savannah-Hilton Head International Airport, GA14 mi77 minS 1010.00 miPartly Cloudy86°F77°F75%1015.4 hPa

Wind History from SVN (wind in knots)
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Last 24hrS5S5SW4CalmSW5W3CalmCalmCalmCalmW3W5W4W5NW6NW4S6S6S7S6S8----S9
1 day agoSW3W6SW7SW7SW6W6W6W5SW3SW4W5NW5W5W4W5W5SW9W7CalmW7W6NW10S7S5
2 days agoCalmW4S3CalmSW3CalmCalmSW3SW3SW3W5W7W5NW7NW9W7W10W7NW9NW8W7W7SW4SW4

Tide / Current Tables for Isle of Hope, Skidaway River, Georgia
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Isle of Hope
Click for Map
Thu -- 02:28 AM EDT     Moonrise
Thu -- 05:11 AM EDT     7.73 feet High Tide
Thu -- 06:50 AM EDT     Sunrise
Thu -- 11:15 AM EDT     -0.16 feet Low Tide
Thu -- 04:39 PM EDT     Moonset
Thu -- 05:45 PM EDT     9.16 feet High Tide
Thu -- 08:05 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.32.54.25.97.17.77.46.24.52.60.9-0.10.21.53.65.87.78.99.18.36.84.92.91.2

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Thu -- 02:10 AM EDT     1.57 knots Max Flood
Thu -- 02:27 AM EDT     Moonrise
Thu -- 05:49 AM EDT     -0.00 knots Slack
Thu -- 06:49 AM EDT     Sunrise
Thu -- 09:16 AM EDT     -1.80 knots Max Ebb
Thu -- 11:52 AM EDT     0.00 knots Slack
Thu -- 02:35 PM EDT     2.28 knots Max Flood
Thu -- 04:38 PM EDT     Moonset
Thu -- 06:29 PM EDT     -0.00 knots Slack
Thu -- 08:04 PM EDT     Sunset
Thu -- 10:06 PM EDT     -2.08 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.21.21.61.41.10.7-0.2-1.1-1.6-1.8-1.7-1.10.21.42.22.21.91.40.5-0.6-1.5-1.9-2.1-1.8

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.