Monday, December11, 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 7:13AMSunset 5:21PM Monday December 11, 2017 5:34 PM EST (22:34 UTC) Moonrise 1:05AMMoonset 1:36PM Illumination 40% Phase: Third Quarter Moon; Moon at 23 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- 408 Pm Est Mon Dec 11 2017
.small craft advisory in effect from Tuesday morning through Wednesday morning...
Tonight..SW winds 10 to 15 kt, increasing to 15 to 20 kt late. Seas 1 to 2 ft, building to 3 to 4 ft late.
Tue..W winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 5 ft.
Tue night..NW winds 20 to 25 kt with gusts to 30 kt. Seas 4 to 6 ft.
Wed..NW winds 15 to 20 kt with gusts to 25 kt, becoming W 10 to 15 kt in the afternoon. Seas 3 to 5 ft, subsiding to 2 to 3 ft in the afternoon.
Wed night..W winds 10 to 15 kt. Seas 2 ft.
Thu..SW winds 10 to 15 kt with gusts to 20 kt. Seas 2 ft.
Thu night..SW winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers.
Fri..W winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers.
Fri night..NW winds 15 to 20 kt. Seas 2 to 3 ft. A chance of showers.
Sat..NW winds 5 to 10 kt. Seas 1 foot.
Sat night..SW winds 5 to 10 kt. Seas 1 foot.
AMZ300 408 Pm Est Mon Dec 11 2017
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail through early Tuesday. A dry cold front will move through the region Tuesday afternoon, followed by cold and dry weather through Thursday. Another cold front will push into the area Friday while low pressure passes offshore. High pressure should return Saturday before another cold front approaches early next week.

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 112036
afdchs
area forecast discussion
national weather service charleston sc
336 pm est Mon dec 11 2017

Synopsis
High pressure will prevail through early Tuesday. A dry cold
front will move through the region Tuesday afternoon, followed
by cold and dry weather through Thursday. Another cold front
will push into the area Friday while low pressure passes
offshore. High pressure should return Saturday before another
cold front approaches early next week.

Near term until 6 am Tuesday morning
Sfc low pressure is expected to race from the mid-west northeast
along the southern shores of the great lakes tonight. A dry cold
front associated with the low pressure system is forecast to sweep
across the southern appalachians late tonight. Sfc winds across the
forecast area should remain from the wsw overnight, with speeds
remaining around 5 kts. Sky cover over the CWA will remain clear to
mostly clear tonight. However, the combination of weak WAA along and
ahead of the cold front and mixing sfc winds, low temperatures
tonight should verify much warmer than the past couple of mornings.

Using a blend of mos, I will forecast low temperatures to range
from the upper 30s inland to the low to mid 40s across the coastal
region.

Short term 6 am Tuesday morning through Thursday
Tuesday: the mid upper levels will consist of a strong trough over
the eastern half of the country, with it's axis stretching from the
great lakes region down into the lower ms valley in the morning. The
axis will move eastward, becoming located over the northeast states
down and off the southeast coast by overnight. At the surface, high
pressure will quickly dissipate in the morning as a dry cold front
approaches, the front is expected to rapidly pass through our area
during the afternoon hours. There is no noticeable moisture with the
front (pwats ahead of it barely reach 0.5"), so no precipitation is
expected. The only impacts with the front will be some clouds and a
wind shift increase. As for temperatures, ahead of the front,
southwest winds will allow temperatures to rise within a few degrees
of normal. Behind the front, cold air advection and clear skies will
cause temperatures to drop. Though, elevated winds should keep them
from dropping too rapidly. Lows will be about 10 degrees below
normal, ranging from the upper 20s far inland to around freezing at
the coast. Additionally, winds could approach lake wind advisory
criteria over lake moultrie Tuesday night.

Wednesday and Thursday: dry high pressure will prevail under a
somewhat zonal flow aloft. This will lead to fairly quiet weather
conditions mid week while temps slowly modify each day. Strong cold
air advection will be slow to weaken on Wednesday, limiting highs
only to the mid upper 40s over most areas. Clear skies will once
again lead to chilly temps Wednesday night. In general, temps should
dip into the lower 30s away from the coast. Conditions will then be
noticeably warmer on Thursday as a west southwest flow develops over
the area while low pressure passes to the north. In general, highs
should approach the upper 50s to lower 60s Thursday afternoon under
mostly sunny skies.

Long term Thursday night through Monday
Latest trends indicate increasing moisture levels Thursday night
into Friday as low pressure develops along a passing cold front just
offshore. Strong divergence associated with the right-rear quadrant
of an upper-lvl jet should also help promote rain shower activity
behind the front, especially as low pressure helps draw moisture
north northwest over it. For these reasons, chances of rain showers
will be possible for most areas Friday, especially near the coast
closer to the vicinity of the front and low pressure passing
offshore. Dry and cooler high pressure will then build over the area
on Saturday with afternoon temps remaining in the mid upper 50s.

Conditions will be noticeably warmer on Sunday as dry high pressure
becomes centered over the southeast. In general, temps should
approach the mid 60s over most areas.

Aviation 20z Monday through Saturday
Vfr. West winds this afternoon will back from the southwest
tonight as a cold front reaches the southern appalachians. The
cold front will near kchs and ksav by 18z Tuesday. Forecast
soundings and lamp guidance indicate that wsw winds will develop
gusts near 20 kts by mid morning Tuesday.

Extended aviation outlook:VFR through Thursday. MVFR possible
Friday as low pressure passes offshore.

Marine
The coastal waters will remain under weak warm air advection through
tonight. However, the pressure gradient across the marine zones will
slowly tighten as a dry cold front pushes off the eastern slopes of
the appalachians late tonight. Southwest surface winds are forecast
to strengthen through the night, increasing by 7 to 10 kts tonight.

By dawn Tuesday, winds across the outer ga waters may develop
frequent gusts around 25 kts. Wave heights will also increase
through tonight, ranging from 3-4 feet within 20 nm to 4-5 feet
between 20nm-60nm.

A tightening pressure gradient ahead of an approaching cold
front will support strengthening wsw winds and an expansion of
small craft advisory conditions Tuesday, especially outside
charleston harbor. Then, in the wake of cold FROPA cold air
advection and increasing marine boundary layer instability mixing
tapping into 40 knots winds aloft will support solid sca
conditions featuring frequent NW gusts 25-30 knots accompanied
by seas 4-7 feet, highest beyond 20-40 nm. Small craft
advisories are already in effect for waters outside charleston
harbor to account for this scenario, and an SCA will likely be
required for the harbor. Also of note, there exists a low
probability for a few gale force gusts across the outer ga
waters, especially beyond 40 nm.

As high pressure builds over the waters, winds should relax and
seas should subside Wednesday through Thursday. Then, another
cold front will push through the waters Friday, and an
associated low pressure will pass offshore. Thus, another round
of SCA winds seas could develop late this week into this
weekend.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory from 11 am Tuesday to 7 am est Wednesday
for amz352-354.

Small craft advisory from 7 am Tuesday to 9 am est Wednesday
for amz374.

Small craft advisory from 4 am Tuesday to 7 am est Wednesday
for amz350.

Near term... Ned
short term... Ms
long term... Dpb
aviation... Ms ned
marine... Dpb ms


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 19 mi46 min SW 5.1 G 6 56°F 55°F1019.1 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 34 mi44 min SSW 12 G 14 57°F 62°F1 ft1019.2 hPa (-1.1)39°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 mi38 minSW 410.00 miFair57°F36°F45%1018.6 hPa
Savannah-Hilton Head International Airport, GA21 mi41 minWSW 510.00 miA Few Clouds57°F34°F42%1019 hPa
Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA22 mi38 minSW 610.00 miFair59°F34°F40%1018.6 hPa

Wind History from SVN (wind in knots)
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Last 24hrSW3CalmCalmCalmSW4SW4CalmSW3SW3W5SW3W3W5SW3W4W7W9W7--W8W7SW7SW5SW4
1 day agoW13W13W7W7SW9W9W8W7W7W8W7W4W5W6W5NW7NW7NW5N5CalmW4W8W6W7
2 days agoNE11NE8N8N9NE6N7NE7N6N6NW7NW10NW8NW10NW12NW8NW11NW6NW8W8W10W13W11W12W13
G20

Tide / Current Tables for Florida Passage, Ogeechee River, Georgia
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Florida Passage
Click for Map
Mon -- 01:04 AM EST     Moonrise
Mon -- 03:01 AM EST     7.27 feet High Tide
Mon -- 07:14 AM EST     Sunrise
Mon -- 09:30 AM EST     0.50 feet Low Tide
Mon -- 01:36 PM EST     Moonset
Mon -- 03:14 PM EST     7.34 feet High Tide
Mon -- 05:21 PM EST     Sunset
Mon -- 09:58 PM EST     0.30 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.85.66.87.36.964.631.50.60.61.63.35.16.67.37.16.24.93.41.90.70.30.8

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Mon -- 01:03 AM EST     Moonrise
Mon -- 03:32 AM EST     -0.00 knots Slack
Mon -- 07:04 AM EST     -2.24 knots Max Ebb
Mon -- 07:14 AM EST     Sunrise
Mon -- 09:40 AM EST     0.01 knots Slack
Mon -- 12:20 PM EST     2.00 knots Max Flood
Mon -- 01:35 PM EST     Moonset
Mon -- 03:50 PM EST     -0.00 knots Slack
Mon -- 05:19 PM EST     Sunset
Mon -- 07:23 PM EST     -2.08 knots Max Ebb
Mon -- 09:59 PM EST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.11.91.50.6-0.5-1.5-2-2.2-1.9-0.90.41.521.91.60.9-0.2-1.2-1.8-2-2-1.201.2

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 (17,4,5,8)
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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.