Saturday, July11, 2020
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Marine Weather and Tides
St. Simons, 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 6:29AMSunset 8:33PM Saturday July 11, 2020 2:20 PM EDT (18:20 UTC) Moonrise 11:56PMMoonset 11:28AM Illumination 62% Phase: Waning Gibbous; Moon at 21 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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AMZ450 Coastal Waters From Altamaha Sound To Fernandina Beach Fl Out 20 Nm- Coastal Waters From Fernandina Beach To St. Augustine Fl Out 20 Nm- Coastal Waters From St. Augustine To Flagler Beach Fl Out 20 Nm- 851 Am Edt Sat Jul 11 2020
Rest of today..West southwest winds 5 to 10 knots becoming south southeast 10 to 15 knots in the afternoon. Seas 1 to 2 feet. Dominant period 9 seconds. Inland waters a light chop. A chance of showers and Thunderstorms.
Tonight..Southwest winds 10 to 15 knots. Seas 2 to 3 feet. Dominant period 8 seconds. Inland waters a light chop.
Sunday..Southwest winds around 10 knots becoming south southeast in the afternoon. Seas 2 to 3 feet. Dominant period 8 seconds. Inland waters a light chop.
Sunday night..Southwest winds 15 to 20 knots. Seas 2 to 3 feet. Dominant period 7 seconds. Inland waters a moderate chop.
Monday..South southwest winds 10 to 15 knots. Seas 2 to 4 feet. Dominant period 7 seconds becoming 0 seconds in the afternoon. Inland waters a moderate chop. A chance of showers and a slight chance of Thunderstorms.
Monday night..Southwest winds 10 to 15 knots. Seas 2 to 4 feet. A chance of showers and Thunderstorms.
Tuesday..South winds 5 to 10 knots. Seas 2 to 3 feet. A chance of showers and Thunderstorms.
Tuesday night..Southwest winds 5 to 10 knots. Seas 2 to 3 feet.
Wednesday..South southwest winds 5 to 10 knots becoming southeast in the afternoon. Seas 1 to 2 feet. A chance of showers and Thunderstorms.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 851 Am Edt Sat Jul 11 2020
Synopsis.. A weak surface front will linger over the southeast atlantic sea board states through the weekend. A stronger front will approach from the west late Sunday into Monday with an increase in southerly winds. This front will stall and weaken over the local waters early next week as high pressure strengthens over south florida.
Gulf stream.. The approximate location of the west wall of the gulf stream as of jul 11, 2020 at 1200 utc... 66 nautical miles east of flagler beach. 75 nautical miles east northeast of saint augustine beach. 80 nautical miles east of jacksonville beach. 91 nautical miles east southeast of st simons island. This data courtesy of the naval oceanographic office.


7 Day Forecast for Marine Location Near St. Simons, GA
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location: 31.13, -81.39     debug


Area Discussion for - Jacksonville, FL
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FXUS62 KJAX 111712 AFDJAX

Area Forecast Discussion National Weather Service Jacksonville FL 112 PM EDT Sat Jul 11 2020

AVIATION. [Through 18Z Sunday]

Not much different in the thinking from the morning Aviation update. with drier air coming in off the Continental U.S. and the upper level trough axis centered over the KJAX AOR most convection should be suppressed and what does form will move east-southeast toward the coast. With high temperatures in the upper 90s expect a few short lived storms will develop but at this point not widespread enough to warrant more than a VCTS remark in the TAFs.

PREV DISCUSSION [732 AM EDT].

NEAR TERM [Through Sunday].

Today . Trof axis ahead of frontal boundary and moisture available in the atmosphere is still kicking off scattered showers and a few storms over inland areas of NE FL/SE GA early this morning and these should mostly fade by the mid morning hours. While this will be a transition day in the upper levels of the atmosphere as drier airmass pushes southward into inland SE GA, at the surface a hot and humid west to northwest flow will quickly push temps into the 90s by mid-day and combined with humid airmass and dewpoints into the mid/upper 70s this will push Heat Indices/Feels Like values into the 107-111 degree range for most of the region and have posted Heat Advisory for all of NE FL and most of SE GA, with only a few counties across inland SE GA where some drier surface air will mix dewpoints into the upper 60s and keep HI values closer to 105 degrees through the afternoon hours. The afternoon rainfall forecast is a bit tougher as the transition to a drier airmass at the mid/upper levels with Precipitable Water Amounts (PWATs) falling to 1.2-1.6 inches across inland SE GA will basically shut down convection there while across NE FL PWATS remaining closer to 2 inches and the weak East Coast Sea Breeze pushing inland will once again trigger scattered to numerous storms across the I-95 corridor, St Johns River Basin and US 301 corridors. Temps still too warm aloft to support severe storms but slow movement to storms will continue locally heavy rainfall as the main threat.

Tonight . Drier Airmass aloft with trof axis at the surface will bring PWATs down to the 1.0-1.5 range and this will lead to a drier night with mostly clear skies developing. Drier airmass will allow for Min Temps in the lower 70s across inland SE GA and mid/upper 70s elsewhere.

Sunday . Mid level trof/dry airmass with widespread PWATs less than 1.5 inches area-wide will basically shut down convection and make for very hot conds with widespread temps into the mid/upper 90s, but enough of the drier airmass will mix down dewpoints into the 60s and this should keep Heat Index/Feels Like values closer to 105 degrees and slightly lower than Heat Advisory criteria. Models suggesting only widely scattered showers/storms across Flagler/Putnam/Marion counties during the afternoon hours.

SHORT TERM [Sunday Night through Tuesday].

Drier conditions caused by the settling air mass on Sunday will result in fewer storms and showers for the remainder of the weekend. Convection will become more widespread on Monday with numerous thunderstorms forming ahead of a somewhat ragged frontal boundary, with storms continuing overnight into early Tuesday morning. High temperatures on Sunday are expected to reach up into the upper 90s, close to 100 degrees, but with the lower humidity levels keeping heat index values near 105 degrees. Temperatures will be slightly lower on Monday and Tuesday, with highs in the mid to upper 90s, but the heat index values will be much closer to 110 degrees due to the increase in moisture levels.

LONG TERM [Wednesday Through Friday].

Upper level ridging will start to build in by midweek leading to a less organized surface wind field, making daily afternoon convection become more driven by the diurnal sea breeze for the remainder of the week. Temperatures will be slightly above the seasonal average, reaching into the lower to mid 90s. Overnight low temperatures will be in the mid to lower 70s.

MARINE.

A trof axis will remain north of the waters along the SE US coast through early next week and this continue a mainly offshore flow at 10-15 knots with seas 2-4 ft. Local onshore sea breeze along the coast during the afternoon hours.

Rip Currents: Low Risk continues in the mostly offshore flow through the weekend with surf mainly 1-2 feet.

PRELIMINARY POINT TEMPS/POPS.

AMG 71 96 75 95 75 / 10 0 20 60 20 SSI 79 90 78 94 77 / 20 20 10 30 30 JAX 75 98 75 98 75 / 20 20 10 30 20 SGJ 76 95 75 95 75 / 20 20 0 20 20 GNV 74 95 73 95 75 / 30 10 10 30 20 OCF 75 95 74 93 75 / 30 20 0 20 10

JAX WATCHES/WARNINGS/ADVISORIES. FL . Heat Advisory until 6 PM EDT this evening for Baker-Bradford- Central Marion-Clay-Coastal Duval-Coastal Flagler-Coastal Nassau-Coastal St. Johns-Eastern Alachua-Eastern Marion- Gilchrist-Hamilton-Inland Duval-Inland Flagler-Inland Nassau-Inland St. Johns-Northern Columbia-Putnam-Southern Columbia-Suwannee-Union-Western Alachua-Western Marion.

GA . Heat Advisory until 6 PM EDT this evening for Brantley-Clinch- Coastal Camden-Coastal Glynn-Echols-Inland Camden-Inland Glynn-Northeastern Charlton-Northern Ware-Pierce-Southern Ware-Wayne-Western Charlton.

AM . None.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SAXG1 - Sapelo Island Reserve, GA 21 mi80 min WNW 7 95°F 1011 hPa (+0.0)76°F
FRDF1 - 8720030 - Fernandina Beach, FL 32 mi50 min W 4.1 G 6 96°F 84°F1011.3 hPa
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 33 mi30 min SSW 5.8 G 7.8 84°F 85°F2 ft1010.4 hPa (-0.9)80°F

Wind History for Fernandina Beach, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Brunswick, Malcolm McKinnon Airport, GA1 mi27 minWSW 810.00 miFair95°F75°F54%1010.5 hPa
Brunswick / Glynco, GA10 mi25 minNW 510.00 miMostly Cloudy93°F75°F56%1010.5 hPa

Link to 5 minute data for KBQK

Wind History from BQK (wind in knots)
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Last 24hrNW5CalmE8SE7SE9S6S6S6S8S7S6SW7SW7W7W6SW6W8W7W7W7NW6NW4W4SW7
1 day agoSW7NW5NW9
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CalmE3SW4S4SW4SW5SW7SW3W4W3CalmSW3W4W4CalmNW6W4W6NW5SW6W6
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Tide / Current Tables for St. Simons Lighthouse, St. Simons Island, Georgia
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Mackay River (Daymark #239), Georgia
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Mackay River (Daymark #239)
Click for Map
Sat -- 12:27 AM EDT     Moonrise
Sat -- 02:10 AM EDT     6.73 feet High Tide
Sat -- 06:30 AM EDT     Sunrise
Sat -- 08:18 AM EDT     0.68 feet Low Tide
Sat -- 12:28 PM EDT     Moonset
Sat -- 02:36 PM EDT     6.42 feet High Tide
Sat -- 08:31 PM EDT     1.45 feet Low Tide
Sat -- 08:32 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.46.36.76.55.64.22.71.40.70.91.83.14.45.66.36.45.74.63.42.21.51.52.23.2

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 Jacksonville, FL (14,3,4,5)
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Ground Weather Radar Station Jacksonville, FL
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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.