Wednesday, December11, 2019
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Marine Weather and Tides
Montgomery, GA

Version 3.4
NOTICE
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:12AMSunset 5:21PM Wednesday December 11, 2019 12:16 AM EST (05:16 UTC) Moonrise 5:10PMMoonset 6:30AM Illumination 100% Phase: Full Moon; Moon at 14 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- 907 Pm Est Tue Dec 10 2019
.small craft advisory in effect from Wednesday afternoon through Friday afternoon...
Tonight..S winds 10 kt, becoming nw late. Seas 3 ft. A chance of showers. Patchy fog after midnight.
Wed..N winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft, building to 4 to 5 ft in the afternoon. A chance of showers in the morning.
Wed night..NE winds 20 to 25 kt with gusts to 30 kt. Seas 4 to 6 ft, building to 5 to 7 ft after midnight.
Thu..NE winds 25 kt with gusts to 35 kt. Seas 6 to 8 ft. A chance of showers in the afternoon.
Thu night..NE winds 20 to 25 kt with gusts to 35 kt, diminishing to 15 to 20 kt with gusts to 25 kt after midnight. Seas 6 to 8 ft, subsiding to 5 to 7 ft after midnight. A chance of showers.
Fri..NE winds 10 to 15 kt with gusts to 20 kt, becoming se in the afternoon. Seas 4 to 6 ft, subsiding to 4 to 5 ft in the afternoon. Showers.
Fri night..S winds 10 kt, becoming sw after midnight. Seas 4 to 5 ft, subsiding to 3 to 4 ft after midnight. Showers likely.
Sat..W winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers.
Sat night..W winds 10 to 15 kt. Seas 3 to 4 ft.
Sun..NW winds 5 to 10 kt. Seas 2 ft.
Sun night..NE winds 5 to 10 kt. Seas 2 ft.
AMZ300 907 Pm Est Tue Dec 10 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will push through the region tonight, with strong high pressure to build over the area Wednesday through Thursday. A low pressure system will impact the area late week, followed by a return to high pressure over the weekend into 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 110344 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 1044 PM EST Tue Dec 10 2019

SYNOPSIS. A cold front will push through the region tonight, with strong high pressure to build over the area Wednesday through Thursday. A low pressure system will impact the area late week, followed by a return to high pressure over the weekend into early next week.

NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/. As of 1035 PM: Coastal observations generally indicate that temperatures have warmed by a degree or two over the past couple of hours. Dewpoints were observed in the mid 60s along the coast. I will update the near term temperatures to align with observations. HRRR sfc condensation pressure deficits fall to less than a mb off the SC coast, representing an area of potential sea fog. If sea fog develops, it will remain until a cold front sweeps from west to east across the region around midnight. I will keep a mention of patchy fog in the forecast. Regional radar indicates very little coverage of showers, I will keep PoPs unchanged.

As of 915 PM: Regional radar composite indicated a few patches of light rain lifting north across the forecast area this evening. I will keep PoPs in the SCHC to CHC range. Sfc observations along the coast indicated a few patches of fog, especially along the Charleston County coast. I will keep patchy fog in the forecast until the cold front arrives. Radar data and sfc observations indicate that the cold front was nearing the I-95 corridor from the west, expected to reach the coast by midnight.

As of 645 PM: Regional radar images indicated a fine line of showers, associated with a cold front, across the middle Carolinas southwest to the FL Panhandle, tracking east around 15 kts. Until the showers arrive, temperatures should remain nearly steady in the mid 60s. I will update the forecast to refine hourly temperature trends, sky, and weather.

Previous Discussion: Tonight: A cold front will advance into the region this evening and should be offshore by the early morning hours. Models have been consistent for several days now showing mainly scattered shower activity along and just behind the front, with the best coverage further north across the southeast South Carolina zones. Don't expect much measurable rainfall, generally less than a tenth of a inch before shower activity comes to an end late tonight. Immediately ahead of the front, winds will diminish and we could have a narrow window of time where fog could form, mainly along and near the coast. Given that guidance hasn't handle the fog very well over the past few days, the forecast features just patchy fog. Any fog that does develop will diminish quickly as winds turn offshore and drier low level air moves in. Temperatures will remain quite warm this evening, with most places holding in the mid to upper 60s. Cooler air will filter in late tonight, supporting lows in the low to mid 50s by sunrise Wednesday.

SHORT TERM /6 AM WEDNESDAY MORNING THROUGH FRIDAY/. Strong high pressure will build over the area from the northwest Wednesday, then shift east toward New England on Thursday. Much cooler air will move into the area with high temps only in the 50s both days.

A developing upper trough over the eastern United States late Thursday will bring several upper shortwaves through the area late Thursday through Friday. Meanwhile, an inverted trough will develop off the SC/GA coast, gradually developing into a closed low pressure system before moving up the coast late Friday. Moisture will begin to overspread the cool surface wedge late Thursday afternoon, potentially bringing a few showers to the area.

More significant moisture and forcing will affect the area late Thursday night through Friday evening, resulting in widespread showers. Given uncertainty in track of the low, temperature forecast is a bit tricky. Current forecast shows highs ranging from the mid 50s inland to low 60s at the coast.

LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/. Models are in decent agreement through the long term period. Low pressure and associated rainfall is expected to be exiting the area Friday night into Saturday. High pressure will return in its wake, with dry conditions expected for the latter half of the weekend and early next week. Temperatures will generally be above normal.

AVIATION /04Z WEDNESDAY THROUGH SUNDAY/. Prior to the 0Z TAFs, regional radar images indicated a fine line of showers, associated with a cold front, across the middle Carolinas southwest to the FL Panhandle, tracking east around 15 kts. Conditions at KCHS and KSAV should remain VFR ahead of the line. The line of showers is timed to reach the terminals late this evening. In the wake of the showers, ceilings should lower to MVFR, close to IFR levels. Based on MOS and forecast soundings, the restrictive ceilings are expected to remain until VFR conditions return during the mid-morning hours on Wednesday. Steady SW winds are forecast ahead of the front, veering from the NW by the pre-dawn hours, then turning from the NE by mid-morning.

Extended Aviation Outlook: Flight restrictions are likely Thursday night through Friday night as a low pressure system impacts the area. VFR is expected to return on Saturday.

MARINE. Tonight: Southerly winds will be in the 10-15 knot range this evening ahead of an approaching cold front. The front should move off the coast in the early morning hours and winds will shift around to northwesterly by sunrise Wednesday. Speeds will be increasing, but should generally be around 15 knots late tonight. Seas will average 3-5 feet. There is still a narrow window of time where sea/marine fog could develop this evening immediately ahead of the front. The forecast mentions patchy fog across the nearshore waters beginning late this evening.

Strong high pressure building in from the northwest will result in strengthening north to northeast winds Wednesday through Thursday, along with building seas. Solid Small Craft Advisory conditions are expected everywhere except Charleston Harbor starting at varying times Wednesday. An Advisory is likely for the Charleston Harbor at some point as well, however it appears winds will not reach criteria until Wednesday night, so have held off on issuing for now.

The worst conditions across the waters will occur late Wednesday night through Thursday, when gale-force gusts will be possible. Gale Watches and/or Warnings could be needed for at least portions of the waters. Conditions will improve on Friday, although advisories will persist as seas take a bit longer to subside.

Low pressure will pass over or near the waters late week into early weekend, followed by a return to high pressure. No additional concerns are expected at this time.

TIDES/COASTAL FLOODING. Elevated tide cycles are expected late week due to increasing astronomical influences with the full moon on Thursday and strong northeasterly winds. Minor to moderate coastal flooding will be possible with the morning high tides Thursday through Saturday. Coastal Flood Advisories could be required. Also of note, if significant rainfall occurs around the morning high tides Friday and Saturday, the potential for flooding of poor drainage areas could increase along the coast.

EQUIPMENT. KCLX will remain down until further notice.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory from noon Wednesday to 4 PM EST Friday for AMZ352-354. Small Craft Advisory from 7 AM Wednesday to 4 PM EST Saturday for AMZ374. Small Craft Advisory from 7 AM Wednesday to 4 AM EST Saturday for AMZ350.

NEAR TERM . NED SHORT TERM . JRL LONG TERM . ETM AVIATION . NED MARINE . BSH/JRL 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 5.1 65°F 59°F1019.3 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 34 mi27 min WSW 5.8 G 7.8 64°F 62°F3 ft1018.8 hPa (+0.4)64°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 mi2.3 hrsSSW 810.00 miOvercast71°F64°F82%1017.9 hPa
Savannah-Hilton Head International Airport, GA21 mi24 minNW 910.00 miOvercast67°F62°F84%1019.5 hPa
Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA22 mi2.3 hrsS 510.00 miOvercast73°F64°F73%1018.2 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrS5SW5S5CalmSE3SE3S3S4S5SW6SW7------S10
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1 day agoE6E4E5E9E7E5E5CalmCalm--SE4S9----S6SE7S8S6S5S6S6S7S8S5
2 days ago--NE5NE7NE7NE7NE5NE7NE6N7N6NE10N8NE9NE6N6E4E5E5E3E6E4E5NE4NE4

Tide / Current Tables for Florida Passage, Ogeechee River, Georgia
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Florida Passage
Click for Map
Wed -- 01:44 AM EST     -0.07 feet Low Tide
Wed -- 06:30 AM EST     Moonset
Wed -- 07:14 AM EST     Sunrise
Wed -- 07:39 AM EST     8.27 feet High Tide
Wed -- 02:21 PM EST     0.25 feet Low Tide
Wed -- 05:09 PM EST     Moonrise
Wed -- 05:21 PM EST     Sunset
Wed -- 08:02 PM EST     7.10 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.40.2-00.92.856.988.27.56.24.52.71.20.30.51.73.55.36.67.16.75.74.2

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Wed -- 01:49 AM EST     0.00 knots Slack
Wed -- 04:33 AM EST     2.40 knots Max Flood
Wed -- 06:30 AM EST     Moonset
Wed -- 07:13 AM EST     Sunrise
Wed -- 08:09 AM EST     -0.00 knots Slack
Wed -- 11:09 AM EST     -2.17 knots Max Ebb
Wed -- 02:35 PM EST     0.00 knots Slack
Wed -- 05:04 PM EST     1.92 knots Max Flood
Wed -- 05:07 PM EST     Moonrise
Wed -- 05:19 PM EST     Sunset
Wed -- 08:37 PM EST     -0.00 knots Slack
Wed -- 11:26 PM EST     -1.88 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.6-0.90.21.52.32.31.81.10.2-1-1.9-2.2-2.1-1.7-0.70.51.51.91.71.20.6-0.4-1.3-1.8

Weather Map
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wmap_A
GEOS Local Image of Southeast    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (0,6,7,8)
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Ground Weather Radar Station Charleston, SC
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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.