Thursday, April9, 2020
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Marine Weather and Tides
Montgomery, GA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 7:00AMSunset 7:50PM Thursday April 9, 2020 6:58 PM EDT (22:58 UTC) Moonrise 8:54PMMoonset 7:19AM Illumination 96% Phase: Waning Gibbous; Moon at 17 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- 316 Pm Edt Thu Apr 9 2020
Tonight..W winds 10 to 15 kt, becoming nw 15 to 20 kt late. Seas 2 ft.
Fri..NW winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Seas 2 to 3 ft. A slight chance of showers in the morning.
Fri night..N winds 10 kt. Seas 2 ft.
Sat..NE winds 10 kt, becoming E in the afternoon. Seas 2 ft.
Sat night..SE winds 10 to 15 kt. Seas 2 to 3 ft. A slight chance of showers after midnight.
Sun..SE winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft, building to 5 to 7 ft in the afternoon. Showers likely with a chance of tstms.
Sun night..S winds 20 to 25 kt, increasing to 25 to 30 kt after midnight. Seas 5 to 7 ft. Showers with a chance of tstms.
Mon..SW winds 20 to 25 kt. Seas 4 to 6 ft. Showers likely with a chance of tstms.
Mon night..W winds 10 kt. Seas 3 to 4 ft. A slight chance of showers and tstms.
Tue..SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
Tue night..E winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 316 Pm Edt Thu Apr 9 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A cold front will cross the area this evening, followed by high pressure into Saturday. A significant storm system is expected to bring impacts to our area during the first part of 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 091950 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 350 PM EDT Thu Apr 9 2020

SYNOPSIS. A cold front will cross the area this evening, followed by high pressure into Saturday. A significant storm system is expected to bring impacts to our area during the first part of next week.

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/. A dry cold front will cross through the forecast area this evening. Aloft, A potent shortwave will pivot into the mid- Atlantic states late tonight. Concurrently, weaker shortwave energy is progged to pass over southeast Georgia. The main impact with this will be an increase and thickening of mid and high level clouds, although a brief, light shower near the Altamaha is not out of the question towards daybreak. Low temperatures are forecast to range from the mid 50s inland to upper 50s at the coast.

Lake winds: A Lake Wind Advisory remains in effect for Lake Moultrie through 8 pm. West winds will gust to around 25 knots into early this evening.

SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY/. Friday: At the beginning of the period, an upper level short wave from South Carolina to southern Louisiana embedded in the west- northwest mid to upper level flow will quickly move through the area. Significant mid and upper level moisture associated with the disturbance will quickly shift off to the east and southeast of the area by mid day. As a result, there could be a few light showers across southern areas in the morning. Despite ample sunshine area wide in the afternoon, much cooler air filtering into the area will result in highs only from the mid 60s in the north to near 70 in the south. Clear skies and light winds will result in good radiational cooling Friday night. This combined with a very dry atmosphere will allow temperatures to drop into the lower to mid 40s away from the coast. Current thinking is that temperatures will remain a bit too warm and dewpoints a bit too low for frost formation.

Dry fuels combined with afternoon relative humidity values dropping to 25 percent or below across a large portion of the area results in some fire weather concerns for Friday. Sustained winds appear to approach 15 mph for awhile in some areas, so in coordination with surrounding offices, another fire danger statement will be issued later this evening for Friday. This would be for areas where relative humidity values of 30 percent or less most closely overlap with sustained winds of near 15 mph. This points to an area from Jenkins County Georgia, northeast and east to Berkeley County in South Carolina.

Saturday: Surface high pressure extending across the area Saturday morning will shift off the coast by afternoon. Mainly clear skies Saturday will give way to increasing mid and high level clouds Saturday night ahead of a developing powerful system. There is a threat for showers after midnight mainly across interior southeast Georgia. High temperatures will be a bit warmer, mainly in the lower to mid 70s. Lows Saturday night should range from the lower 50s inland to the lower 60s near the coast.

Sunday: There are some model differences with regard to timing, but all the models move a strong upper level storm system into the lower Mississippi Valley by late Sunday. A warm front will likely lift north through the area during the day as mid to upper 60s dewpoint temperatures overspread the area. Moisture and lift will be increasing during the day and this should result in periods of showers. At the present time it appears that the more widespread shower activity and the higher rainfall totals will develop west and northwest of our area. Wind fields throughout the atmosphere will be strengthening. Instability across the area will be on the increase during the day, especially across southeast Georgia where afternoon CAPE values could reach as high at 1000 J/KG. Thunderstorms will be possible especially during the afternoon in southeast Georgia. By late afternoon 0-1KM Helicity values could exceed 250 m2/s2 in most areas. Even though it appears that the best threat for severe weather will be Sunday night into early Monday, it does appear that severe thunderstorms will be possible on Sunday, especially across interior southeast Georgia in the afternoon. Highs on Sunday will be from the mid 70s in the north to near 80 in the south.

LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/. The models show a strong storm system bringing impacts to the area. There could be a threat for severe thunderstorms and heavy rain Sunday night into Monday. Conditions improve somewhat Monday night as the heaviest rain moves offshore. Occasional showers could then persist across our area through Wednesday.

AVIATION /19Z THURSDAY THROUGH TUESDAY/. VFR through 18Z Saturday. Winds are expected to remain gusty until this evening. As a cold front moves through the region late tonight, winds will decrease and shift northwest. Around daybreak, winds are expected to become gusty until late afternoon Friday.

Extended Aviation Outlook: VFR through Saturday evening. A storm system is expected to bring flight restrictions and gusty winds later Saturday night into Monday.

MARINE. Tonight: Small Craft Advisory conditions have not materialized over the coastal SC waters, so the advisory has been cancelled. In the Charleston Harbor, gusts to 25 kt will continue into early evening. A cold front will cross the waters tonight, allowing winds to veer from the west to the northwest by daybreak. Speeds will also increase to the 15-20 kt range, however conditions look to stay below advisory criteria.

Extended Marine: High pressure will bring tranquil marine conditions Friday into Saturday. A strong system will approach the area on Sunday and move through the area Sunday night and into Monday. It does appear quite likely that Small Craft Advisories will be needed for all of the coastal waters, including the Charleston Harbor starting on Sunday. Gale conditions are possible across all of the coastal waters Sunday night. Conditions should gradually improve by late Monday.

TIDES/COASTAL FLOODING. Another round of minor coastal flooding is expected along the SC coast tonight. Less than a 0.3 ft tidal anomaly is needed to reach criteria, which should be met despite offshore winds. A Coastal Flood Advisory has been issued for 9PM-midnight. Further south in Georgia, tide levels should remain below flooding thresholds.

Higher than normal tides are expected the next several days due to astronomical influences from the full moon and perigee.

Additionally, winds are forecast to be onshore Saturday into Sunday, which could further elevate the tides. As a result, minor to perhaps moderate coastal flooding is expected with the evening high tides through the weekend and perhaps into Monday.

CLIMATE. Record high temperatures for April 9: CHS . 90 degrees set in 2011 SAV . 91 degrees set in 2011 Downtown Charleston . 89 degrees last set in 2001

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . Lake Wind Advisory until 8 PM EDT this evening for SCZ045. Coastal Flood Advisory from 9 PM this evening to midnight EDT tonight for SCZ048>050. MARINE . Small Craft Advisory until 8 PM EDT this evening for AMZ330.

NEAR TERM . ETM SHORT TERM . MTE LONG TERM . MS AVIATION . MTE/RAD MARINE . ETM/MTE TIDES/COASTAL FLOODING . CLIMATE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 19 mi88 min WNW 21 G 24 83°F 69°F1004.1 hPa
SAXG1 - Sapelo Island Reserve, GA 30 mi118 min WNW 15 88°F 1004 hPa (-2.0)62°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 34 mi128 min W 7.8 G 9.7 76°F 71°F1 ft1004 hPa (-1.7)69°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 mi62 minW 1110.00 miFair87°F60°F41%1003.7 hPa
Savannah-Hilton Head International Airport, GA21 mi65 minWNW 15 G 2510.00 miPartly Cloudy87°F59°F39%1004.1 hPa
Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA22 mi62 minW 13 G 1910.00 miFair87°F59°F39%1004.3 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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1 day agoW8W9SW7SW6SW5W3S3S3W3CalmCalmSW3W6SW5W6W9W9
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2 days agoS10S8S7S7S5S5S5S4SW6SW4S5SW5SW5SW3--SW7SW5S7SW7S9--SW8SW10SW7

Tide / Current Tables for Florida Passage, Ogeechee River, Georgia
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Florida Passage
Click for Map
Thu -- 04:44 AM EDT     -1.32 feet Low Tide
Thu -- 07:02 AM EDT     Sunrise
Thu -- 08:18 AM EDT     Moonset
Thu -- 10:23 AM EDT     8.54 feet High Tide
Thu -- 04:56 PM EDT     -1.14 feet Low Tide
Thu -- 07:50 PM EDT     Sunset
Thu -- 09:54 PM EDT     Moonrise
Thu -- 10:53 PM EDT     9.24 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.55.53.10.8-0.9-1.3-02.45.17.38.48.37.35.53.41.2-0.5-1.1-0.224.77.28.89.2

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Thu -- 02:03 AM EDT     -2.86 knots Max Ebb
Thu -- 04:54 AM EDT     0.00 knots Slack
Thu -- 07:01 AM EDT     Sunrise
Thu -- 07:28 AM EDT     2.69 knots Max Flood
Thu -- 08:17 AM EDT     Moonset
Thu -- 11:00 AM EDT     -0.00 knots Slack
Thu -- 02:07 PM EDT     -2.55 knots Max Ebb
Thu -- 05:02 PM EDT     0.00 knots Slack
Thu -- 07:45 PM EDT     2.83 knots Max Flood
Thu -- 07:49 PM EDT     Sunset
Thu -- 09:53 PM EDT     Moonrise
Thu -- 11:31 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.8-2.6-2.9-2.6-1.50.21.72.62.621.20-1.3-2.2-2.5-2.4-1.5-0.11.52.62.82.41.70.7

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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (18,4,5,8)
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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 numerous 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.