Tuesday, January21, 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 7:21AMSunset 5:48PM Tuesday January 21, 2020 2:48 PM EST (19:48 UTC) Moonrise 4:35AMMoonset 3:02PM Illumination 12% Phase: Waning Crescent; Moon at 26 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- 1244 Pm Est Tue Jan 21 2020
.small craft advisory in effect until 6 pm est this evening...
.gale watch in effect from 6 pm est this evening through late tonight...
This afternoon..N winds 20 to 25 kt with gusts to 30 kt. Seas 4 to 6 ft.
Tonight..N winds 25 to 30 kt with gusts to 35 kt. Seas 4 to 6 ft, building to 6 to 8 ft after midnight.
Wed..N winds 20 to 25 kt with gusts to 30 kt. Seas 6 to 8 ft, subsiding to 5 to 7 ft in the afternoon.
Wed night..NE winds 15 to 20 kt with gusts to 25 kt. Seas 4 to 6 ft.
Thu..NE winds 15 kt with gusts to 20 kt. Seas 4 to 6 ft, subsiding to 4 to 5 ft in the afternoon. A slight chance of showers.
Thu night..NE winds 10 to 15 kt. Seas 4 to 5 ft, subsiding to 3 to 4 ft after midnight. A chance of showers.
Fri..SE winds 10 to 15 kt. Seas 3 to 4 ft. Showers likely.
Fri night..SW winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers.
Sat..W winds 10 to 15 kt. Seas 3 to 4 ft.
Sat night..NW winds 10 to 15 kt. Seas 2 to 3 ft.
AMZ300 1244 Pm Est Tue Jan 21 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will build across the area through midweek, then weaken in advance of a low pressure system impacting the region late week into early this weekend. High pressure will then return later in the weekend then persist through 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 211800 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 100 PM EST Tue Jan 21 2020

SYNOPSIS. High pressure will build across the area through midweek, then weaken in advance of a low pressure system impacting the region late week into early this weekend. High pressure will then return later in the weekend then persist through early next week.

NEAR TERM /UNTIL 6 PM THIS EVENING/. A deep mid level low will shift across Georgia today, and eventually off the Southeast coast this evening. At the surface, the forecast area will be positioned between high pressure inland and deepening low pressure well offshore. The main story of the day will be the chilly temperatures. Despite a good amount of sunshine, highs are only forecast to top out in the low to mid 40s. Gusty north winds will make it feel like the mid 30s. With the early afternoon update, we lowered highs a touch based on latest observation trends.

Tonight: There could be a few stratocu along upper coastal SC early this evening, otherwise clear skies will prevail, winds will remain north and elevated and temps going sub-freezing across the region. Strong cyclogenesis is forecast over the Gulf Stream east of the Florida Coast overnight and tight gradients expected along coastal zones overnight. These may result in mixing and wind speeds that push wind chills close to the 15 degree advisory criteria late, however the coverage/duration looks very marginal at this time. Lows should dip into the mid to upper 20s many areas.

Lake Winds: Advisory conditions are possible on Lake Moultrie tonight into early Wednesday as north flow will increase close to 20 kt with gusts up to 25 kt. An advisory may be required.

SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY/. Wednesday: Cold air advection associated with a mid-lvl low should help produce breezy northerly winds (20-25 mph) along coastal areas through much of the morning before the bulk of colder air and stronger pressure gradient shift further offshore. Conditions will remain dry across the area as high pressure builds from the north while low pressure deepens over the western Atlantic. Temps will struggle to warm significantly due to a persistent northerly wind in place. In general, temps will peak in the lower 50s under mostly sunny skies. Overnight, temps will remain slightly warmer than the previous night due to some clouds spreading across the area after midnight. In general, temps will dip into the lower 30s inland to mid/upper 30s closer to the coast.

Thursday: High pressure will remain wedged across the area through much of the day, but will begin to weaken as a coastal trough develops along the Southeast Coast during the night. Northeast winds will prevail during the day, but temps should be slightly warmer than the previous day as a mid-lvl ridge axis becomes positioned just off the coast. In general, high temps should range in the mid/upper 50s. During the night, isolated to scattered showers could develop across the area as the coastal trough develops along the Southeast Coast. Temps will be considerably warmer than the previous night as winds turn more onshore and clouds thicken across the region. In general, low temps should range in the low/mid 40s inland to upper 40s/lower 50s at the coast.

Friday: A coastal trough along the Southeast Coast will lift north early in advance of a low pressure system quickly advancing toward the area from the west. Southerly flow will prevail, helping moisture deepen across the area and temps to warm considerably higher than the previous day. In general, max temps should range in the low/mid 60s, before the onset of scattered to numerous showers ahead/along a cold front arriving across western zones late.

LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/. A cold front is expected to shift across the area Friday night, producing scattered to numerous showers at most locations. Sfc high pressure will then spread across the area Saturday and become centered across the region early next week while a mid-lvl trough prevails over the Mid-Atlantic and Northeast states. The pattern will support slightly cooler conditions once fropa occurs, but temps should remain within a few degrees of normal. In general, high temps should range in the upper 50s/lower 60s each day while lows dip into the mid/upper 30s inland to lower 40s near the coast.

AVIATION /18Z TUESDAY THROUGH SUNDAY/. VFR will prevail through 18Z Wednesday. North winds will remain gusty, even at times overnight. Conditions should remain shy of low level wind shear with elevated surface winds, but will certainly need to be monitored with future TAF issuances.

Extended Aviation Outlook: VFR conditions are expected at both CHS and SAV terminals Wednesday and Thursday. Flight restrictions are possible Friday into early Saturday due to showers and low clouds associated with a passing cold front. VFR conditions are then expected to return at both terminals Saturday afternoon.

MARINE. A tight pressure gradient between high pressure inland and developing low pressure east of the waters will result in strong north winds today, with the worst conditions to occur tonight. A Gale Warning is now in effect for the outer Georgia waters, and a transition to Gale Warning is expected late this afternoon for the Charleston county waters. Small Craft Advisories are in effect for the remaining nearshore marine zones, with a Gale Watch later today.

Tuesday through Saturday: A strong pressure gradient will persist across all coastal waters between high pressure building from the north and low pressure offshore. The pattern will favor dangerous marine conditions across most coastal waters outside the CHS Harbor Wednesday morning with north-northeast winds gusting upwards to 30- 40 kts and seas peaking between 4-7 ft across nearshore waters and 9- 13 ft across offshore Georgia waters. A Gale Warning will therefore remain in effect across northern South Carolina waters until early Wednesday afternoon and across offshore Georgia waters into Wednesday evening. Elsewhere, Small Craft Advisories will likely be in place through much of Wednesday until pressure gradient begins to weaken and bulk of strongest cold air advection associated with a mid-lvl low shifts further offshore. Persistent north-northeast sfc winds could allow 5-6 ft seas to linger across nearshore waters Wednesday night while 6-9 ft seas gradually subside to 5-7 ft across offshore Georgia waters Thursday into Friday. Winds will become more onshore by daybreak Friday, then turn southerly as a coastal trough lifts north ahead of a low pressure system approaching the coast from the west. A cold front associated with this system is expected to shift offshore Friday evening/night, before high pressure builds across the waters heading into Saturday. Conditions will become elevated post fropa, but should remain below Small Craft Advisory levels across nearshore waters. Further offshore, 5-7 ft seas could persist through Saturday.

TIDES/COASTAL FLOODING. Cold high pressure will build across the area mid-week while low pressure deepens offshore. Strong north-northeast winds between these two features will help produce elevated tide levels a few days before the upcoming new moon (Jan 24). Tide levels could reach 7.0- 7.3 FT MLLW along the Southeast South Carolina coast during the Wednesday and Thursday morning high tides and Coastal Flood Advisories could eventually be needed.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory until 5 PM EST Wednesday for AMZ330. Gale Watch from 6 PM EST this evening through late tonight for AMZ352-354. Small Craft Advisory until 6 PM EST this evening for AMZ350- 352-354. Gale Warning from 6 PM this evening to 1 PM EST Wednesday for AMZ350. Gale Warning until 7 PM EST Wednesday for AMZ374.

NEAR TERM . ETM SHORT TERM . DPB LONG TERM . DPB AVIATION . ETM MARINE . DPB/ETM TIDES/COASTAL FLOODING .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 19 mi48 min NNE 16 G 20 40°F 56°F1026 hPa (-3.0)
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 34 mi58 min N 23 G 29 41°F 59°F7 ft1024.7 hPa (-2.0)26°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 mi1.9 hrsN 13 G 1710.00 miMostly Cloudy41°F10°F29%1026.7 hPa
Savannah-Hilton Head International Airport, GA21 mi1.9 hrsN 12 G 2310.00 miMostly Cloudy42°F14°F32%1027.6 hPa
Wright Army Airfield (Fort Stewart)/Midcoast Regional Airport, GA22 mi1.9 hrsN 15 G 2210.00 miOvercast41°F12°F30%1027.4 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrNW7N6N7N9N7N6NE6NE5NE6N3N3N4N6N6N6N8N7N8N11
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1 day agoW10NW11W14W10NW14W9W10NW11NW12NW9NW8NW11NW11NW8N7N10
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2 days agoSE6S6S6S5S4S7S12
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SW8SW9SW6SW8SW5SW6SW6SW5W5SW5S7--SW7W11NW9NW8W8

Tide / Current Tables for Florida Passage, Ogeechee River, Georgia
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Florida Passage
Click for Map
Tue -- 04:34 AM EST     Moonrise
Tue -- 05:48 AM EST     7.55 feet High Tide
Tue -- 07:23 AM EST     Sunrise
Tue -- 12:27 PM EST     -0.07 feet Low Tide
Tue -- 03:01 PM EST     Moonset
Tue -- 05:48 PM EST     Sunset
Tue -- 05:58 PM EST     6.52 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.20.72.44.46.27.37.57.164.52.7100.11.234.86.16.56.15.23.82.20.7

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Tue -- 02:39 AM EST     2.10 knots Max Flood
Tue -- 04:33 AM EST     Moonrise
Tue -- 06:32 AM EST     -0.00 knots Slack
Tue -- 07:22 AM EST     Sunrise
Tue -- 10:04 AM EST     -2.34 knots Max Ebb
Tue -- 12:40 PM EST     0.00 knots Slack
Tue -- 03:00 PM EST     Moonset
Tue -- 03:09 PM EST     1.66 knots Max Flood
Tue -- 05:46 PM EST     Sunset
Tue -- 06:37 PM EST     -0.00 knots Slack
Tue -- 10:13 PM EST     -1.90 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.31.422.11.91.50.6-0.5-1.4-2-2.3-2-0.90.41.31.71.61.30.6-0.4-1.2-1.6-1.9-1.7

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 (14,3,4,5)
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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.