Thursday, September21, 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 7:10AMSunset 7:22PM Thursday September 21, 2017 9:53 AM EDT (13:53 UTC) Moonrise 7:27AMMoonset 7:33PM Illumination 1% Phase: New Moon; 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- 655 Am Edt Thu Sep 21 2017
Today..Variable winds 5 kt, becoming se 5 to 10 kt this afternoon. Seas 2 to 3 ft.
Tonight..SE winds 5 to 10 kt. Seas 2 ft.
Fri..NE winds 5 to 10 kt, becoming E 10 to 15 kt in the afternoon. Seas 2 to 3 ft, building to 3 to 4 ft in the afternoon. A slight chance of showers and tstms in the afternoon.
Fri night..E winds 10 to 15 kt. Seas 4 to 5 ft. A chance of showers with a slight chance of tstms.
Sat..NE winds 15 kt. Seas 4 to 6 ft. A chance of showers with a slight chance of tstms.
Sat night..NE winds 10 to 15 kt. Seas 4 to 6 ft. A chance of showers with a slight chance of tstms in the evening.
Sun..NE winds 10 to 15 kt. Seas 5 to 7 ft.
Sun night..NE winds 10 to 15 kt. Seas 5 to 7 ft.
Mon..N winds 10 kt. Seas 4 to 6 ft.
Mon night..N winds 5 to 10 kt. Seas 4 to 5 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 655 Am Edt Thu Sep 21 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail through this weekend. The high will weaken and shift inland as hurricane maria tracks northward off the southeast u.s. Coast through the first half 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 211113
afdchs
area forecast discussion
national weather service charleston sc
713 am edt Thu sep 21 2017

Synopsis
High pressure will prevail through this weekend. The high will
weaken and shift inland as hurricane maria tracks northward off
the southeast u.S. Coast through the first half of next week.

Near term through tonight
Today: a very weak surface pressure pattern will persist across
the forecast area. An upper level trough axis extends through
ga and the carolinas while pwats look to be more elevated across
our ga zones nearing convective initiation this afternoon. The
00z NAM bears this out with a narrow slot of drier 850-500 mb
rhs north of i-16 into southeast sc during the afternoon hours.

With low-level convergence again quite weak during the sea
breeze oscillation period, we have minimal pops but did maintain
low-end chance pops in our coastal half southern zones of
southeast ga. Isolated showers and tstms possible along the sc
sea breeze. It will be another warm day with highs just a degree
or two Wednesday's highs.

Tonight: a few of the high resolution models suggest isolated
evening convection could linger along a sagging mid level
trough axis across our far northern zones around the santee
cooper lakes. With the loss of diurnal heating and warm mid
level temps, we only hung onto 20 pops prior to midnight while
suspecting models could be overdone. We also opted for patchy
fog mentions across northwest zones late tonight where various
guidance progs suggest the higher chances.

Short term Friday through Sunday
Weak upper troughing and some increased moisture will persist
across the area Friday into Saturday and this along with a
fairly weak sea breeze will support a few showers and
thunderstorms, mainly in the afternoon on Friday and just in ga
on Saturday. Building high pressure from the north later
Saturday and Sunday should keep things dry this period.

Temperatures will stay above normal, generally upper 80s during
the day and around 70 at night.

Long term Sunday night through Wednesday
Inland high pressure will persist through early next week while
confidence is increasing that hurricane maria will remain offshore
of the southeast u.S. Coast as it tracks north through the middle of
next week. Some showers could skirt coastal areas early next week as
maria passes by but otherwise mainly dry conditions are anticipated.

Temperatures look to stay above normal.

Aviation 12z Thursday through Monday
Mainly shallow ground fog along the coastal corridor early this
morning, most noticeable at kchs. Otherwise, conditions will be
vfr today and into tonight. Chances for convection at the
terminals still looks low-end at mid afternoon along the sea
breeze. The potential for fog exists again late tonight, mainly
after 06z through daybreak on Friday.

Extended aviation outlook: low probability for brief flight
restrictions in early morning fog and or low clouds Saturday morning
and in mainly afternoon showers thunderstorms Friday at kchs ksav
and at ksav Saturday.

Marine
Through tonight, relatively tranquil conditions with winds variable
at times as high pressure to the north eventually turning synoptic
flow onshore by early Friday. Wind speeds will be below 15 kt
with seas 2-3 ft, mainly in long period swell.

Thursday through Monday: no significant concerns before swells from
hurricane maria nearing the southeast bahamas later this week begin
to impact the waters Thursday night or Friday. Advisories will be
likely for the offshore waters starting Friday and the nearshore
waters starting Friday night. Seas could build to 10 feet or more
near the gulf stream Saturday night and persist in Monday, although
much depends on the exact track strength of hurricane maria.

Rip currents: astronomical influences and a lingering long
period ground swell component will support a low-end moderate
rip current risk at area beaches today. Swell from offshore
hurricane maria will create more significant rip current risks
this weekend into the middle of next week.

Tides coastal flooding
On this morning's high tide cycle, some shallow coastal flooding
is possible around downtown charleston but for now, we have
held off on a coastal flood advisory for levels reaching very
close to 7.0 feet mllw.

Powerful surf created by offshore hurricane maria will drive
significant wave run-up, which could cause further beach erosion
this weekend into early next week. Also, the potential for
shallow salt water flooding will persist through early next week
around the times of high tide, particularly along the sc coast.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term...

short term... Rjb
long term... Rjb
aviation...

marine... Rjb
tides coastal flooding...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 9 mi65 min NW 1.9 G 2.9 78°F 80°F1018 hPa
41033 40 mi105 min NW 3.9 G 5.8 78°F 1025.5 hPa
SAXG1 - Sapelo Island Reserve, GA 41 mi113 min Calm 75°F 1017 hPa (+2.0)75°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 41 mi63 min ENE 1.9 G 1.9 80°F 80°F3 ft1017.1 hPa (+1.6)73°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 mi1.9 hrsN 08.00 miFair72°F70°F97%1016.9 hPa
Savannah-Hilton Head International Airport, GA14 mi60 minS 38.00 miPartly Cloudy77°F73°F90%1017.8 hPa

Wind History from SVN (wind in knots)
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Last 24hrSW5SW5S3SW3W6CalmNW4NE12
G27
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1 day agoNW3NW5NW5CalmSW4NW4W4NW4SE9SE6S5SE3SE3CalmS3S5CalmCalmCalmSW3SW4W4CalmSW3
2 days agoN6N8NE9N9N8--N6N10N7NE5CalmCalmCalmCalmCalmCalmCalmW3W3CalmW3CalmCalmW4

Tide / Current Tables for Isle of Hope, Skidaway River, Georgia
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Isle of Hope
Click for Map
Thu -- 03:58 AM EDT     -0.15 feet Low Tide
Thu -- 07:11 AM EDT     Sunrise
Thu -- 08:26 AM EDT     Moonrise
Thu -- 10:24 AM EDT     9.21 feet High Tide
Thu -- 04:23 PM EDT     -0.12 feet Low Tide
Thu -- 07:21 PM EDT     Sunset
Thu -- 08:32 PM EDT     Moonset
Thu -- 10:36 PM EDT     9.13 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
7.14.92.50.6-0.10.52.24.46.68.39.197.963.71.400.11.53.65.97.88.99

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Thu -- 01:55 AM EDT     -2.33 knots Max Ebb
Thu -- 04:28 AM EDT     0.01 knots Slack
Thu -- 07:06 AM EDT     2.24 knots Max Flood
Thu -- 07:11 AM EDT     Sunrise
Thu -- 08:25 AM EDT     Moonrise
Thu -- 10:51 AM EDT     -0.00 knots Slack
Thu -- 02:25 PM EDT     -2.50 knots Max Ebb
Thu -- 04:58 PM EDT     0.00 knots Slack
Thu -- 07:21 PM EDT     Sunset
Thu -- 07:30 PM EDT     2.26 knots Max Flood
Thu -- 08:32 PM EDT     Moonset
Thu -- 11:07 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.6-2.1-2.3-1.9-0.70.81.92.22.11.71-0.2-1.3-2-2.4-2.4-1.50.11.42.22.21.81.20.2

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 (9,2,3,4)
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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.