Thursday, August13, 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 6:46AMSunset 8:10PM Thursday August 13, 2020 4:08 AM EDT (08:08 UTC) Moonrise 12:31AMMoonset 2:47PM Illumination 31% Phase: Waning Crescent; Moon at 24 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 Am Edt Thu Aug 13 2020
Today..SW winds 10 kt, becoming S 10 to 15 kt late. Seas 2 to 3 ft. A chance of showers and tstms this afternoon.
Tonight..SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Fri..SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Fri night..S winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Sat..SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Sat night..SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Sun..SW winds 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Sun night..SW winds 10 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Mon..SW winds 5 to 10 kt. Seas 2 ft. A chance of showers and tstms.
Mon night..SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers and tstms. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 316 Am Edt Thu Aug 13 2020
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. A trough of low pressure will persist inland, while high pressure remains over the atlantic through late week. A weak cold front will approach the region over the weekend and linger in the vicinity into the middle 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 130752 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 352 AM EDT Thu Aug 13 2020

SYNOPSIS. A trough of low pressure will persist inland, while high pressure remains over the Atlantic through late week. A weak cold front will approach the region over the weekend and linger in the vicinity into the middle of next week.

NEAR TERM /THROUGH TONIGHT/. Today: The surface and low levels will feature the typical Bermudas-Azores High stretching across Florida, as a trough remains positioned over or near the local area. The mid and upper level pattern indicates light wind fields between an upstream trough over the Tennessee and lower Mississippi Valley, while a weak impulse is over the nearby ocean. As the surface ridge drifts northward through the day, there is a subtle increase in the low level southwesterly flow, which transports an extremely moist air mass into the region. The resulting PWat will be in excess of 2 inches, which is near or greater than the 90th percentile for this time of year. Accompanying the moisture will be MUCAPE of 2500-3500 J/kg, along with forcing from the nearby Atlantic impulse aloft, the sea breeze and inland trough. This will support another fairly active convective day.

Isolated to scattered showers and a few t-storms near and west of US-301 will fade by daybreak, while at the same time an increase in coastal convergence will produce isolated to scattered showers and t-storms that could impact parts of Charleston and eastern Berkeley County. That activity could spread a little further inland to cover parts of the Charleston tri-county district along with coastal Colleton by noontime. However, the greatest concentration of convection will occur this afternoon, as various meso-scale boundaries get involved. As a result, we have PoP as great as 50-60% after 2 pm, with even locally higher coverage to occur. The severe risk is non- zero given DCAPE of 800-1000 J/kg, which could produce marginally severe wet microbursts. In addition, given the abundance of moisture and a weak storm motion, locally heavy rainfall will also occur in some of the storms.

Temps will achieve the lower 90s inland from the beaches prior to the onset of the better convective coverage, before the hourly temp curve becomes altered due to the increase in showers and t-storms the second half of the afternoon.

Tonight: The bulk of the diurnally driven convection will fade by mid evening, although given remaining outflow boundaries, we still have isolated to scattered PoPs through midnight. Then similar to recent overnight periods, convection will develop over the nearby Atlantic and attempt to spread onshore late. Convective debris clouds will slowly diminish in both thickness and areal extent, while late night cumuliform clouds will start to move onshore. Min temps will be near or slightly above climo.

SHORT TERM /FRIDAY THROUGH SUNDAY/. A surface trough will remain over the region through late week, while high pressure persists offshore. Later in the weekend, a weak cold front will likely move into the area. Aloft, a mid level trough axis will shift eastward, eventually settling over the region. Showers and thunderstorms will be possible each day, with coverage peaking in the afternoon and evenings. The highest rain chances will be on Friday and Saturday as passing shortwave energy provides additional forcing for ascent. Sunday should see less coverage overall as the axis of deepest moisture shifts off the coast and somewhat drier air moves into the area. The threat for severe weather through the period is low, but can't rule out a stronger storm or two. Temperature forecast will be on repeat, with highs and lows remaining within a few degrees of normal each day.

LONG TERM /SUNDAY NIGHT THROUGH WEDNESDAY/. Models are in fair agreement in the long term period. A weak cold front will stall over the region during the early to middle of next week. The upper pattern will become more amplified with time as a strong shortwave drops into the Ohio River Valley. While rain chances will be in the forecast each day, the most active convective days of the set appear to be Tuesday and Wednesday as vort energy and deeper moisture moves into the area. Temperatures will be fairly close to normal.

AVIATION /07Z THURSDAY THROUGH MONDAY/. We'll maintain watch for SHRA/TSRA near the KCHS terminal between 10Z and 15Z today, associated with convergence from off the Atlantic. However, latest indications are that the better chances stay east of the terminal. Thus, we have prevailing VFR there and at KSAV this morning.

Scattered to numerous SHRA/TSRA will occur this afternoon into the evening along the sea breeze interacting with other meso- scale boundaries. Flight restrictions are certainly possible from about 18Z-24Z, but since we have at least 1 more TAF before that time, we will include just VCTS and Cb clouds to both KCHS and KSAV during that period. Adjustments could be required later today as radar trends become more evident.

Extended Aviation Outlook: Flight restrictions possible in showers and thunderstorms each day, mainly in the afternoon and evening.

MARINE. Today and tonight: The local waters will be situated along the west-northwest periphery of the Bermuda-Azores High, while a trough lingers inland over the Southeast. There is enough packing of the gradient between these two features, plus a boost from the sea breeze to generate S and SW winds as high as around 15 kt today, while nocturnal low level jet action maintains similar conditions tonight. Seas will average 2-3 feet throughout.

Even though the Non-supercell Tornado Parameter is as much as 2-3 units early this morning, wind fields look to be a little too strong regarding waterspouts. Should winds diminish, then the risk for waterspouts would increase. We'll maintain a close weather watch.

Meanwhile, conditions do favor locally strong t-storms both today and tonight, with the potential for a few Marine Weather Statements and/or Special Marine Warnings for winds in excess of 30 or 35 kt, frequent lightning and heavy rains.

Friday through Tuesday: Outside of any showers and thunderstorms, no marine concerns are anticipated through early next week. South to southwest winds will prevail with speeds at or below 15 knots, generally highest late week into the weekend with a slightly tighter pressure gradient. Seas will average 2 to 3 feet.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . None.

NEAR TERM . SHORT TERM . ETM LONG TERM . ETM AVIATION . MARINE .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FPKG1 - 8670870 - Fort Pulaski, GA 19 mi50 min WSW 5.1 G 8.9 83°F 85°F1015.7 hPa
SAXG1 - Sapelo Island Reserve, GA 30 mi68 min SSW 6 80°F 1016 hPa (+0.0)76°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 34 mi78 min SSW 14 G 16 83°F 85°F2 ft1015.4 hPa (-0.5)78°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 mi72 minW 310.00 miMostly Cloudy76°F73°F93%1014.8 hPa
Savannah-Hilton Head International Airport, GA21 mi75 minN 010.00 miFair77°F75°F94%1015.5 hPa

Link to 5 minute data for KSVN

Wind History from SVN (wind in knots)
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Last 24hrSW3SW4SW3W5SW5S5CalmCalmS6SW4S9S13S9SE7W11CalmCalmE3CalmCalmCalmCalmW3Calm
1 day agoW3CalmCalmSW5W4W4W4W3CalmCalmCalmS8S7SE8S8S9S5CalmSW6CalmCalmW3CalmSW6
2 days agoCalmCalmCalmS4S3SE4SW5W5S3W4CalmS4S7SW8SW18SE4W5W4CalmS3SW7CalmW3W6

Tide / Current Tables for Florida Passage, Ogeechee River, Georgia
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Florida Passage
Click for Map
Thu -- 01:30 AM EDT     Moonrise
Thu -- 04:12 AM EDT     6.18 feet High Tide
Thu -- 06:48 AM EDT     Sunrise
Thu -- 10:36 AM EDT     0.88 feet Low Tide
Thu -- 03:46 PM EDT     Moonset
Thu -- 04:41 PM EDT     7.26 feet High Tide
Thu -- 08:09 PM EDT     Sunset
Thu -- 11:24 PM EDT     1.45 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.43.64.75.76.265.242.81.7111.73.14.76.27.17.26.75.64.33.12.11.5

Tide / Current Tables for Savannah River Entrance, Georgia Current
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Savannah River Entrance
Click for Map
Thu -- 01:21 AM EDT     1.33 knots Max Flood
Thu -- 01:29 AM EDT     Moonrise
Thu -- 04:50 AM EDT     -0.00 knots Slack
Thu -- 06:46 AM EDT     Sunrise
Thu -- 07:25 AM EDT     -1.35 knots Max Ebb
Thu -- 10:58 AM EDT     0.00 knots Slack
Thu -- 01:43 PM EDT     1.87 knots Max Flood
Thu -- 03:46 PM EDT     Moonset
Thu -- 05:21 PM EDT     -0.00 knots Slack
Thu -- 08:01 PM EDT     -1.53 knots Max Ebb
Thu -- 08:08 PM EDT     Sunset
Thu -- 11:51 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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0.91.31.20.90.5-0.1-0.9-1.3-1.3-1.1-0.8011.71.81.50.90.3-0.6-1.3-1.5-1.5-1.3-0.7

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 (4,6,7,8)
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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 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.