Monday, July13, 2020
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Marine Weather and Tides
St. Augustine, FL

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 6:32AMSunset 8:30PM Monday July 13, 2020 9:36 PM EDT (01:36 UTC) Moonrise 12:24AMMoonset 1:13PM Illumination 38% Phase: Third Quarter Moon; Moon at 23 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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AMZ454 Expires:202007140900;;807791 Fzus52 Kjax 140057 Cwfjax Coastal Waters Forecast For Northeast Florida/southeast Georgia National Weather Service Jacksonville Fl 857 Pm Edt Mon Jul 13 2020 Atlantic Coastal Waters From Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm. Seas Are Provided As A Range Of The Average Height Of The Highest 1/3 Of The Waves, Along With The Occasional Height Of The Average Highest 1/10 Of The Waves. Amz450-452-454-140900- 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- 857 Pm Edt Mon Jul 13 2020
Rest of tonight..West southwest winds 15 knots. Seas 2 to 3 feet. Dominant period 7 seconds. Inland waters a moderate chop.
Tuesday..West southwest winds 5 to 10 knots, becoming east southeast 10 to 15 knots in the afternoon. Seas 1 to 2 feet. Dominant period 8 seconds. Inland waters a light chop. A chance of showers and Thunderstorms.
Tuesday night..South southwest winds 10 to 15 knots, becoming west 5 to 10 knots after midnight. Seas 1 to 2 feet. Dominant period 8 seconds. Inland waters becoming mostly smooth. A slight chance of showers and Thunderstorms.
Wednesday..West northwest winds around 5 knots, becoming east southeast 10 knots in the afternoon. Seas 1 to 2 feet. Dominant period 8 seconds. Inland waters becoming a light chop. A chance of showers and Thunderstorms.
Wednesday night..Southeast winds 5 to 10 knots. Seas 1 to 2 feet. Dominant period 8 seconds. Inland waters mostly smooth.
Thursday..East winds 10 to 15 knots. Seas 1 to 2 feet. Dominant period 8 seconds. Inland waters a light chop. A chance of showers and a slight chance of Thunderstorms.
Thursday night..East southeast winds 10 knots. Seas 2 to 3 feet.
Friday..East winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers and Thunderstorms.
Friday night and Saturday..East southeast winds 10 to 15 knots. Seas 2 to 3 feet. A chance of showers and Thunderstorms.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 857 Pm Edt Mon Jul 13 2020
Synopsis.. Weak troughing will remain situated just north of the georgia waters through midweek, resulting in prevailing offshore winds during the overnight and morning hours that will shift to onshore during the afternoon. Scattered showers and Thunderstorms will be possible through midweek, especially during the afternoon and evening hours in the near shore waters. High pressure will then build over the canadian maritime region late this week and will slowly expand down the southeastern seaboard, shifting winds to a prevailing onshore direction through the weekend. An easterly wave may cross our local waters on Saturday, potentially increasing shower and Thunderstorm coverage throughout our local waters.
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. Augustine, FL
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location: 29.88, -81.31     debug


Area Discussion for - Jacksonville, FL
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FXUS62 KJAX 140000 AFDJAX

Area Forecast Discussion National Weather Service Jacksonville FL 800 PM EDT Mon Jul 13 2020

AVIATION. [Through 00Z Wednesday]

VFR conditions will prevail at the regional terminals through at least 17Z Tuesday. Westerly surface winds will remain sustained at 5-10 knots early this evening, with sustained speeds around 5 knots continuing overnight through Tuesday morning. Showers and thunderstorms are expected to develop after 17Z near the regional terminals, with a slow eastward storm motion initially through the mid to late afternoon hours. The Atlantic and Gulf coast sea breezes will develop during the early afternoon and will push inland, resulting in surface winds shifting to easterly and increasing to 10-15 knots outside of thunderstorm activity at SGJ by 18Z and then east-southeasterly at CRG and SSI towards 19Z, with sustained southwesterly surface winds increasing to near 10 knots at GNV and VQQ towards 20Z.

PREV DISCUSSION [328 PM EDT].

NEAR TERM [Through Tonight].

Convection is nil or near nil over the region this afternoon due to warm temperatures aloft (-6C at 500 mb). There is subtle hint of convergence along the First Coast late this afternoon with a surface trof right along the coast. This may bring a renegade pop- up shower or two late this afternoon with perhaps a clap or two of thunder. Otherwise, muggy conditions this evening into the overnight hours. Lows will be in the mid/upper 70s. The prevailing southwest flow which may develop some overnight showers and isolated storms over the NE GOM and the Big Bend Region of FL which may push inland to the I-75 corridor of inland NE FL toward sunrise.

SHORT TERM [Tuesday Through Wednesday Night].

Tuesday will be a similar set up as far as low-level flow pattern goes with a southwesterly flow with low level ridge axis near the FL Keys. Even more moisture recovery Tuesday will result in higher PoP coverage with the early morning showers coming in off the Gulf, transitioning to convective activity favoring interior counties by late morning and early afternoon, pressing toward the coastal FL and GA the remainder the day. Precipitable water values will climb into the 1.8 to 2.0 range for most of NE FL with PWATS about 1.6 to 1.8 over SE GA. Scattered to numerous showers are forecast for NE FL with mainly widely scattered coverage for SE GA.

On Wednesday, there will be a high pressure over coastal New England and another area of high pressure over the NE Gulf of Mexico. This pattern will bring lighter winds conducive for both the east coast and west coast seabreezes developing. With this said highest convective coverage will be across the interior counties between I-95 and I-75 with a collision of sea breezes likely to occur. PoPs 55-65% west of I-95. There is a potential for a few storms to become strong to marginally severe by mid to late afternoon into very early evening.

Daily high temperatures during this period are expected to reach into the lower to mid 90s with peak heat index values ranging between 100-108 degrees. Overnight low temperatures are expected to be in the mid 70s for midweek.

LONG TERM [Thursday Through Monday].

The western Atlantic ridge will be a further north with axis extending into south central GA while another area of high pressure will encompass Appalachian region. This pattern will bring a deep onshore flow pattern which will favor the east coast sea breeze development in the late morning to early afternoon, yielding diurnal convection across the interior and then pressing towards the western CWA during the mid to late afternoon through the early evening. Temperatures for the end of the week and into the weekend are expected to be slightly above the climatological average.

MARINE.

Trof axis down the SE US coastline will keep mainly offshore flow at 10-15 knots with seas 2-4 ft through mid-week with local onshore sea breezes along the coast. As the trof axis breaks down during the mid-week time frame, it will get replaced a weak High pressure ridge north of the waters and expect a more onshore east to southeast flow to develop by Thu/Fri time frame. No headlines.

Rip Currents: Low Risk of Rips continues in the offshore flow with surf/breakers in the 1-2 feet range through Tuesday.

PRELIMINARY POINT TEMPS/POPS.

AMG 74 97 75 96 74 / 0 20 20 50 20 SSI 78 93 78 91 79 / 0 20 10 20 10 JAX 76 96 76 96 76 / 0 40 20 40 20 SGJ 75 93 75 92 76 / 0 40 20 40 10 GNV 75 93 75 94 74 / 0 40 20 60 20 OCF 75 92 75 93 74 / 10 40 10 60 20

JAX WATCHES/WARNINGS/ADVISORIES. FL . None. GA . None. AM . None.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SAUF1 - St. Augustine, FL 3 mi37 min SW 6 G 7 87°F 83°F1013.3 hPa (+0.9)74°F
41117 15 mi41 min 85°F2 ft
GTXF1 - Guana Tolomato Matanzas Reserve, FL 16 mi112 min WSW 2.9 89°F 1014 hPa73°F
JXUF1 36 mi67 min 87°F
MYPF1 - 8720218 - Mayport (Bar Pilots Dock), FL 36 mi67 min 87°F
DMSF1 37 mi67 min 87°F

Wind History for I-295 Bridge, St Johns River, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Northeast Florida Regional Airport, FL6 mi41 minSSW 510.00 miFair86°F75°F70%1013.1 hPa

Link to 5 minute data for KSGJ

Wind History from SGJ (wind in knots)
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Last 24hrS5SW6SW4SW6W5SW4SW5W3S5SW5SW6W7SW9W10W7
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1 day agoW10SW6W6SW6SW5SW4W7W7SW6SW9W5W5W5SW3W56W7SW6SE11SE9SE9SE12S9S7
2 days agoSW6S7SW6SW5SW5W5W5CalmW5W5W6W6W7W43E9--SE10SE8SE9S8SE9S7SW3

Tide / Current Tables for State Road 312, Matanzas River, Florida
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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 Crescent Beach, Matanzas River, Florida
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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 (21,6,7,8)
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Ground Weather Radar Station Jacksonville, FL
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Disclaimer:
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.