Sunday, August20, 2017 L-36.com


Marine Weather and Tides
Montgomery, 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 6:51AMSunset 8:02PM Sunday August 20, 2017 12:17 AM EDT (04:17 UTC) Moonrise 4:32AMMoonset 6:23PM Illumination 5% 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- 1034 Pm Edt Sat Aug 19 2017
Tonight..SW winds 10 to 15 kt. Seas 2 ft.
Sun..SW winds 5 to 10 kt, becoming se in the afternoon. Seas 2 ft. A slight chance of showers and tstms.
Sun night..SE winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms in the evening, then a chance of showers and tstms after midnight.
Mon..SE winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Mon night..SE winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Tue..SE winds 5 to 10 kt. Seas 2 ft. A slight chance of showers and tstms.
Tue night..S winds 5 to 10 kt. Seas 2 to 3 ft. A slight chance of showers and tstms.
Wed..SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Wed night..S winds 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Thu..SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Thu night..SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 1034 Pm Edt Sat Aug 19 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A weak stationary front will gradually dissipate across the region through early next week. A stronger cold front is expected to arrive in the middle to latter part of next week, likely followed by a slightly cooler and drier airmass.

7 Day Forecast for Marine Location Near Montgomery, GA
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location: 31.84, -81.15     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 200224
afdchs
area forecast discussion
national weather service charleston sc
1024 pm edt Sat aug 19 2017

Synopsis
A weak stationary front will gradually dissipate across the
region through early next week. A stronger cold front is
expected to arrive in the middle to latter part of next week,
likely followed by a slightly cooler and drier airmass.

Near term until 6 am Sunday morning
Tonight: a stationary front should begin to dissipate over or just
north of the area while a mid upper lvl low positioned over the
eastern gulf of mexico continues to advect moisture north along the
western periphery of atlantic high pressure. Despite a gradual
increase in moisture, the loss of daytime heating will maintain
stable precip free conditions over the area for a majority of night.

Late tonight and or around daybreak, a light southerly flow off
the ocean and the resulting convergence could allow for a few
showers and or thunderstorms to move onshore from the atlantic,
mainly along coastal locations in southeast south carolina. A
slight chance of showers and thunderstorms will therefore remain
in the forecast for these locations. Temperatures will remain
above normal, but should be slightly "cooler" than the past few
nights. In general, low temps will range in the mid 70s well
inland to upper 70s to around 80 degrees near the coast.

Short term 6 am Sunday morning through Tuesday
Sunday and Sunday night: the large mid and upper level ridge
centered over the subtropical atlantic will expand and strengthen
across the forecast area. As this occurs aloft, surface high
pressure to the east will become more influential and help to drive
a persistent onshore flow. Overall convection chances look minimal
and primarily limited to the immediate coast where low level
convergence will be strongest. The severe threat will be quite low
thanks to warm profiles and weak instability. The onshore flow
should keep temperatures closer to the coast in the low 90s, though
mid 90s will be possible well inland. Heat index values will top out
in the 100-105 range. Overnight, a well defined disturbance aloft is
progged to approach the southeast coast embedded within the upper
ridge. Model solutions are in good agreement that an increase in
shower and thunderstorm activity over the coastal waters will begin
to push onshore late and overall rain chances will increase. Pop's
along the coast increase to around 40 percent, with 20-30 percent
chances further inland. Temperatures will remain quite warm, with
lows in the mid to upper 70s.

Monday and Monday night: the forecast for eclipse day is certainly
tricky. Viewing conditions across the forecast area will depend
heavily on how morning shower and thunderstorm activity
evolves. There is good agreement across forecast models that
rain chances are increasing for this time period as the
aforementioned mid upper level disturbance within the ridge
settles along the southeast coast. It appears there should be at
least scattered showers and thunderstorms for much of the
morning, with perhaps even numerous coverage over the coastal
waters. Current thinking is that this morning activity will
begin to dissipate some time in the late morning early afternoon
period with the focus then becoming inland areas later in the
day. The best scenario for viewing the eclipse will be if the
morning activity can dissipate in time for some possible partial
clearing by late afternoon. However, models such as the nam
would suggest that showers and thunderstorms will continue to
develop through the early afternoon with plentiful obscuring
cloud cover. Forecast confidence is low at this time.

Temperatures tricky and will also be dependent on how convection
plays out. Overnight, another round of isolated to scattered
showers storms will be possible mainly over the coastal waters.

Tuesday: the embedded mid upper level disturbance will shift further
inland and rain chances will lower back into the 20-30 percent
range. The focus is again going to be along the land sea interface
where sufficient convergence will be confined. Temperatures will
continue to be above normal with low 90s expected in most areas.

Long term Tuesday night through Saturday
Wednesday through Saturday: broad high pressure will gradually
weaken across the region on Wednesday as a cold front slides across
the southern appalachians by the afternoon. A cold front should
push across the forecast area on Thursday, likely supporting a band
of thunderstorms. High pressure sourced from canada will remain
centered well north of the region through the rest of the week.

However, the forecast area should see slightly cooler and drier
conditions Friday night into the weekend. In fact, guidance supports
afternoon dewpoints in the upper 60s inland by Saturday afternoon.

Aviation 02z Sunday through Thursday
Vfr conditions are expected to prevail at both chs and sav terminals
through 00z Monday. However, brief flight restrictions are possible
Sunday afternoon due to showers and or thunderstorms along a seabreeze,
mainly at the chs terminal.

Extended aviation outlook: thunderstorms may result in short periods
of flight restrictions, greatest potential during the afternoon and
early evening.

Marine
Tonight: winds seas are expected to remain well below small craft
advisory levels as the pressure gradient slackens in response to a
weak front dissipating near or just north of the waters. In general,
south-southwest winds will peak around 15 kts. Seas will range
between 2-3 ft.

Sunday through Thursday: subtropical high pressure over the atlantic
will drive onshore flow Sunday and Monday, taking on a more
southerly component through Wednesday. By Thursday, a cold front
will approach the region and winds will prevail out of the
southwest. Wind speeds will stay at or below 15 knots through the
period, primarily highest along the land sea interface each
afternoon. Seas will average 2-3 feet through the period, up to 4
feet at times in the outer waters.

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 through Tuesday along parts of the sc coast.

Equipment
The temperature and dew point sensors at the downtown charleston
observation site (kcxm) could periodically fail. Technicians
plan on fixing the problem.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term... Dpb
short term...

long term...

aviation... Dpb
marine... Dpb
tides coastal flooding...

equipment...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 19 mi47 min SSW 4.1 G 7 84°F 87°F1015.7 hPa
SAXG1 - Sapelo Island Reserve, GA 30 mi77 min S 5.1 83°F 1015 hPa (+1.0)80°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 34 mi87 min S 12 G 14 85°F 85°F2 ft1014.8 hPa (+1.3)77°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, GA13 mi79 minS 310.00 miFair83°F77°F83%1014.8 hPa
Savannah-Hilton Head International Airport, GA21 mi24 minN 010.00 miFair82°F78°F88%1015.6 hPa
Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA22 mi19 minN 010.00 miFair79°F73°F86%1015.1 hPa

Wind History from SVN (wind in knots)
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Last 24hrSW6SW6SW7SW6W5W5CalmSW3SW3SW3W6S3SW4W5W5CalmW3S7S8S7S5S4S3S3
1 day agoSW5--S3S4SW4SW6W6--SW4W5NW8NW5N5SW3W5W6S7S11S9
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2 days agoSW4CalmSW5W3CalmCalmCalmCalmW3W5W4W5NW6NW4S6S6S7S6S8----S9SW9S3

Tide / Current Tables for Florida Passage, Ogeechee River, Georgia
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Florida Passage
Click for Map
Sun -- 02:19 AM EDT     -0.13 feet Low Tide
Sun -- 05:32 AM EDT     Moonrise
Sun -- 06:52 AM EDT     Sunrise
Sun -- 07:59 AM EDT     7.84 feet High Tide
Sun -- 02:32 PM EDT     -0.64 feet Low Tide
Sun -- 07:23 PM EDT     Moonset
Sun -- 08:02 PM EDT     Sunset
Sun -- 08:25 PM EDT     9.05 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.70.9-0.10.21.73.85.97.37.87.46.34.62.70.8-0.4-0.50.93.35.97.98.98.986.4

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Sun -- 02:35 AM EDT     0.00 knots Slack
Sun -- 05:08 AM EDT     1.88 knots Max Flood
Sun -- 05:31 AM EDT     Moonrise
Sun -- 06:51 AM EDT     Sunrise
Sun -- 08:45 AM EDT     -0.00 knots Slack
Sun -- 12:15 PM EDT     -2.33 knots Max Ebb
Sun -- 02:44 PM EDT     0.01 knots Slack
Sun -- 05:29 PM EDT     2.51 knots Max Flood
Sun -- 07:22 PM EDT     Moonset
Sun -- 08:01 PM EDT     Sunset
Sun -- 09:15 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-2.4-2-0.80.51.51.91.81.50.8-0.3-1.3-2-2.3-2.1-1.10.41.82.42.52.11.50.3-0.9-1.9

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 (0,6,7,8)
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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.