Wednesday, February24, 2021
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Marine Weather and Tides
St. Augustine South, FL

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:53AMSunset 6:22PM Wednesday February 24, 2021 12:31 PM EST (17:31 UTC) Moonrise 3:42PMMoonset 5:12AM Illumination 95% Phase: Waxing Gibbous; Moon at 13 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:202102242215;;046746 Fzus52 Kjax 241315 Cwfjax Coastal Waters Forecast For Northeast Florida/southeast Georgia National Weather Service Jacksonville Fl 815 Am Est Wed Feb 24 2021 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. Amz450-452-454-242215- 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- 815 Am Est Wed Feb 24 2021
Rest of today..Southwest winds 5 knots becoming southeast 5 to 10 knots in the afternoon. Seas 2 to 3 feet with a dominant period 8 seconds. A light chop on the intracoastal waters.
Tonight..South winds 10 knots becoming west after midnight. Seas 2 to 3 feet with a dominant period 9 seconds. Mostly smooth on the intracoastal waters.
Thursday..West winds 5 to 10 knots becoming southeast in the afternoon. Seas 2 to 3 feet with a dominant period 8 seconds. A light chop on the intracoastal waters.
Thursday night..Southeast winds 5 to 10 knots becoming east 5 knots after midnight. Seas 2 to 3 feet. Mostly smooth on the intracoastal waters.
Friday..East winds 5 to 10 knots. Seas 2 to 3 feet. A light chop on the intracoastal waters.
Friday night..Southeast winds 5 to 10 knots becoming south after midnight. Seas 2 to 3 feet. Patchy fog.
Saturday..Southeast winds 5 to 10 knots. Seas 2 to 3 feet.
Saturday night..Southeast winds 10 to 15 knots becoming south 5 to 10 knots after midnight. Seas 3 to 4 feet. Patchy fog.
Sunday..South winds 5 to 10 knots increasing to 10 to 15 knots in the afternoon. Seas 3 to 4 feet.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 815 Am Est Wed Feb 24 2021
Synopsis.. High pressure will be located over north and central florida through Thursday. A weak cold front will move into the georgia waters by late Friday. This front will then lift northward this weekend as atlantic ridge extends its axis westward across the florida peninsula. Patchy sea fog is possible Friday night and Saturday night over our local waters.
Gulf stream.. The approximate location of the west wall of the gulf stream as of feb 23, 2021 at 1200 utc... 63 nautical miles east of flagler beach. 74 nautical miles east southeast of saint augustine beach. 87 nautical miles east of jacksonville beach. 103 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 South, FL
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location: 29.87, -81.31     debug


Area Discussion for - Jacksonville, FL
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FXUS62 KJAX 241710 AFDJAX

Area Forecast Discussion National Weather Service Jacksonville FL 1210 PM EST Wed Feb 24 2021

AVIATION. [Through 18Z Thursday]

VFR conds expected through the period with light and variable winds. Inland fog chances at VQQ/GNV still too low to include at this time.

PREV DISCUSSION [834 AM EST].

NEAR TERM [Today Through Tonight].

A 1021 mb surface high is located over the northeast GOMEX and the Suwannee Valley area, with light to calm winds over region at this time. Clear skies, and widespread temps in the 40s are noted in the obs, with a slight offshore wind at the coast. Temps may bottom out in the 35 to 40 range inland areas this morning. Very patchy, shallow radiation fog will be possible early this morning given the calm winds and clear skies.

The ridge axis will remain near our south zones today and ensure a warm advection regime under mean low level flow from the southwest. This will result in warmer temps today with highs generally around 75-80 inland, but lower 70s at the coast due to developing sea breeze this aftn. These highs are near 5-10 deg above normal. A narrow zone of low level moisture is noted in the guidance over the southeast zones which may contribute to just a few cumulus in the late morning and aftn.

Tonight, a 1000-950 mb ridge axis will be south of the area with the surface high quasi-stationary in the northeast GOMEX. Low temps not as cold as this morning but widespread 40s are likely again. There is some chance of sea fog/stratus to advect in from the GOMEX with the weak onshore flow from today and tonight over the FL big bend. Uncertain on the extent of fog and stratus given the low level flow is relatively weak and the airmass is pretty dry already. For now, will place in partly cloudy skies western zones after midnight, and have patchy fog near the I-75 corridor toward sunrise.

SHORT TERM /Thursday through Saturday night/.

Broad surface high pressure ridge will be over region Thursday into Thursday night. Mostly clear skies expected Thursday, with slowly increasing clouds from the north Thursday night. A light north to northeast flow expected, with flow becoming more onshore. Due to the onshore flow, highs will run about 5 degrees cooler at the beaches. The opposite will be the case at night, with readings 3 to 5 degrees warmer at the beaches than inland. This temperature differential will be due to the coastal water temperatures averaging in the upper half of the 50s.

A weak surface front will lay west to east across SE GA Friday into Friday night as an upper wave moves east across GA. Much of the energy with this wave will stay north of the forecast area, and the surface feature will lift to the north through the day into Friday night. While a few showers will be possible north of Waycross, most of the forecast area will be dry. A little more of a northeast surge is expected Friday afternoon, which yield a large difference between afternoon highs, between coast and inland.

The high will build toward the east Saturday into Saturday night, leading to a warmer south flow. An afternoon sea breeze will help cool coastal communities later in the day Saturday, but the difference compared to inland should not be as much as Thursday and Friday.

With dewpoints rising this period, potential for fog will increase through this period.

LONG TERM /Sunday through Tuesday/.

The high will continue centered to the east Sunday continuing warm southerly flow. The high will sink more to the southeast Sunday night. A cold front will drop into SE GA Monday. The long range models diverge on handling of the front at this point, as to whether it passes to the south with another wave moving across Tuesday, or it stalls and through Tuesday, with wave riding along boundary. In either case, unsettled period expected for early next week, with potential for a period of heavy rain. Temperatures will be more of forecast challenge early next week, due to the uncertainty of the frontal passage. In general expect above normal readings this period, but the combination of front and rainfall coverage could lead to cooler readings Tuesday.

The nightly fog potential will extend through at least Sunday night.

MARINE.

High pressure ridge will settle just south of the area through Thursday. Daily sea breezes will turn winds onshore in the afternoon hours. The high will weaken Thursday night as a weak cool front moves into southern GA and adjacent coastal waters on Friday. Winds will turn easterly Friday in response. The front will lift back north as a warm front over the weekend and high pressure ridging will build in from the south. Given rising dewpoints and cool shelf waters, a chance of sea fog may exist for the weekend and early next week. A slight increase in winds and seas looks likely for the weekend due to the northeast flow along the Carolina coasts, but otherwise winds and seas will remain on the low side the next few days. The next cold front will approach from the northwest on Monday.

Rip Currents: Low risk anticipated through Thursday given the weak flow and low surf heights.

FIRE WEATHER.

High dispersion over portions of northeast FL this afternoon. Otherwise, dry again today with aftn minimum RH in the upper 20s to lower 30s. Chance for patchy fog early Thursday and over the weekend.

HYDROLOGY.

Major River Flooding: Ongoing along Alapaha River near the Statenville gauge. Current trends indicate water level slowly receding to moderate flood status by Thursday morning.

Moderate River Flooding: Ongoing along the lower Altamaha River near the Everett City gauge and expected to continue into Saturday.

Minor River Flooding: Ongoing along most of the St. Marys, Satilla, Altamaha and Santa Fe Rivers. The lower Santa Fe will continue to rise through the end of the week as flow becomes blocked by rising waters near its confluence with the lower Suwannee River, with moderate flooding forecast to begin along the lower Santa Fe River near Three Rivers Estates by late Saturday as minor flooding begins along lower portions of the Suwannee River from the gauge near Luraville southward to around the gauge near Rock Bluff.

PRELIMINARY POINT TEMPS/POPS.

AMG 44 77 51 72 54 / 0 0 0 10 0 SSI 49 70 52 68 56 / 0 0 0 0 0 JAX 45 77 52 76 58 / 0 0 0 0 0 SGJ 48 73 54 74 60 / 0 0 0 0 0 GNV 44 78 51 80 58 / 0 0 0 0 0 OCF 43 78 51 82 58 / 0 0 0 0 0

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 mi32 min N 2.9 G 2.9 62°F 59°F1023 hPa (-0.5)55°F
41117 15 mi66 min 60°F2 ft
GTXF1 - Guana Tolomato Matanzas Reserve, FL 15 mi107 min NE 1.9 67°F 1024 hPa47°F
LTJF1 36 mi50 min 70°F 40°F
JXUF1 37 mi44 min 64°F
MYPF1 - 8720218 - Mayport (Bar Pilots Dock), FL 37 mi44 min E 6 G 8 67°F 60°F1023 hPa
BLIF1 38 mi44 min SW 1.9 G 4.1 72°F 1023.4 hPa52°F
DMSF1 38 mi44 min 62°F
NFDF1 40 mi44 min SSW 4.1 G 6 70°F 1022.4 hPa52°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, FL7 mi36 minENE 810.00 miA Few Clouds69°F42°F38%1022.8 hPa

Link to 5 minute data for KSGJ

Wind History from SGJ (wind in knots)
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Last 24hrNE12NE8E8E8E5SE4S3CalmCalmCalmCalmCalmSW4CalmSW3W3CalmCalmCalmCalmCalmE4E7E8
1 day agoSE12SE13SE11SE7W6NW3SW3CalmCalmSW4SW6W6W4W6W8W7W4NW7NW5NW9N9N9NE11NE9
2 days agoE8E6E7E14E12SE8SE6E7E9SE8SE8SE7SE5S3S3S4CalmCalmCalmCalmS4S11SE13S12
G17

Tide / Current Tables for St. Augustine, city dock, Florida (2)
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St. Augustine
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Wed -- 05:11 AM EST     Moonset
Wed -- 06:10 AM EST     4.80 feet High Tide
Wed -- 06:56 AM EST     Sunrise
Wed -- 12:37 PM EST     0.48 feet Low Tide
Wed -- 03:41 PM EST     Moonrise
Wed -- 06:21 PM EST     Sunset
Wed -- 06:30 PM EST     4.24 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.71.62.73.74.44.84.643.12.11.20.60.51.11.92.83.74.24.23.72.81.80.8

Tide / Current Tables for East Tocoi, St. Johns River, Florida (2)
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East Tocoi
Click for Map
Wed -- 05:12 AM EST     Moonset
Wed -- 06:20 AM EST     4.92 feet Low Tide
Wed -- 06:57 AM EST     Sunrise
Wed -- 12:18 PM EST     5.86 feet High Tide
Wed -- 03:43 PM EST     Moonrise
Wed -- 06:22 PM EST     Sunset
Wed -- 06:58 PM EST     4.96 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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5.75.65.45.25.154.955.15.45.65.85.95.85.75.55.35.15555.35.55.6

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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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.