Saturday, August8, 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 6:47AMSunset 8:14PM Saturday August 8, 2020 8:09 AM EDT (12:09 UTC) Moonrise 10:24PMMoonset 10:11AM Illumination 80% Phase: Waning Gibbous; Moon at 19 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:202008082100;;109220 Fzus52 Kjax 080645 Cwfjax Coastal Waters Forecast For Northeast Florida/southeast Georgia National Weather Service Jacksonville Fl 245 Am Edt Sat Aug 8 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. Amz450-452-454-082100- 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- 245 Am Edt Sat Aug 8 2020
Today..West winds 5 knots becoming southeast 5 to 10 knots in the afternoon. Seas 1 to 2 feet with a dominant period 9 seconds. A light chop on the intracoastal waters. Slight chance of showers and Thunderstorms in the afternoon.
Tonight..South winds 5 to 10 knots becoming southwest after midnight. Seas 2 to 3 feet with a dominant period 9 seconds. Mostly smooth on the intracoastal waters.
Sunday..Southwest winds 5 knots becoming southeast 5 to 10 knots in the afternoon. Seas 1 to 2 feet with a dominant period 8 seconds. A light chop on the intracoastal waters. Slight chance of Thunderstorms in the morning. Chance of showers. Chance of Thunderstorms in the afternoon.
Sunday night..South winds 5 to 10 knots. Seas 1 to 2 feet. Mostly smooth on the intracoastal waters. Slight chance of showers and Thunderstorms.
Monday..Southwest winds 5 to 10 knots becoming southeast in the afternoon. Seas 1 to 2 feet. A light chop on the intracoastal waters. Slight chance of showers and Thunderstorms in the morning, then chance of showers and Thunderstorms in the afternoon.
Monday night..South winds 5 to 10 knots becoming southwest after midnight. Seas 1 to 2 feet. Chance of showers and slight chance of Thunderstorms.
Tuesday..South winds 5 to 10 knots becoming southeast in the afternoon. Seas 1 to 2 feet. Chance of showers and Thunderstorms.
Tuesday night..South winds 5 to 10 knots. Seas 1 to 2 feet. Chance of showers and Thunderstorms.
Wednesday..South winds 5 to 10 knots. Seas 1 to 2 feet. Chance of showers and Thunderstorms.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 245 Am Edt Sat Aug 8 2020
Synopsis.. High pressure will sit in place to our east, rendering generally southwesterly flow during the night and morning hours, switching to south-southeast winds in the afternoon and evening with the sea breeze. This daily sea breeze circulation will also bring chances for evening showers and Thunderstorms. Seas will remain low, around 3 feet or less.
Gulf stream.. The approximate location of the west wall of the gulf stream as of aug 06, 2020 at 1200 utc... 65 nautical miles east of flagler beach. 72 nautical miles east of saint augustine beach. 82 nautical miles east of jacksonville beach. 98 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 081112 AFDJAX

Area Forecast Discussion National Weather Service Jacksonville FL 712 AM EDT Sat Aug 8 2020

AVIATION. [Through 12Z Sunday]

Moist Southwest flow continues but Precipitable Water Amounts have fallen below 2 inches as a small amount of dry air has pushed in aloft and this will cut down slightly on the storm coverage this afternoon so have opted to keep the VCTS in place at all TAF sites for now generally in the 20-24Z time range this afternoon and evening. Otherwise mainly VFR conds expected through tonight.

PREV DISCUSSION [249 AM EDT].

NEAR TERM [Through Tonight].

The area remains on the western periphery of the deep layer Atlantic ridge, with a mid-upper level shortwave over the TN Valley this morning that will translate eastward off the mid- Atlantic coastline this evening. Water vapor satellite imagery shows a much drier air mass currently associated with this air mass, particularly at the mid and upper levels. That said, our persistent low-level southwesterly flow will continue to feed warm, moist Gulf air to the region, so model guidance suggests there won't be much drop in PW values over the area today as this feature moves overhead. During the daytime hours, the low level southwest flow in place will favor a dominant Gulf coast sea breeze front affecting north-central FL and the Suwannee Valley, with the Atlantic sea breeze staying along the I-95 corridor. Instability today is forecast to be lower than the previous several days, so overall coverage will likely be lower. One factor that may also come into play late in the period is a quasi- stationary frontal boundary draped across Nrn GA/AL and Wrn SC which is poised to nudge southeastward into central GA/SC today before stalling out again for the night. Outflow from daytime convection on that boundary may advect into our area in the evening/overnight hours and, depending on how it interacts with residual local sea breeze boundaries, we could see convection linger late into the night. Main thunderstorm hazards will be the potential for downbursts of damaging wind gusts and heavy rainfall. Temperatures will be warm, peaking in the low-mid 90s this afternoon (heat index values of 100-106) and dipping into the mid-upper 70s overnight.

SHORT TERM [Sunday Through Monday].

Guidance continues to show a hot, humid, unstable airmass across forecast area during this period. Surface high pressure ridge axis will be just S of forecast area, resulting in a light southwesterly flow across the area. This will lead to a more eastward location of sea breeze collisions . when showers and t-storms will reach maximum coverage each afternoon. Could see a few strong/severe pulse storms with wet microbursts. This pattern will also support above normal temperatures with highs in the mid 90s inland, lower 90s coast . and afternoon heat index values in the 104-108 range. Low temperatures will be in the lower-mid 70s . except upper 70s coast.

LONG TERM [Tuesday Through Saturday].

During this period, the surface high pressure ridge is forecast to gradually shift northward and be across southern GA by Thu/Fri . resulting in more of an onshore flow pattern. This will tend to focus the greater coverage of afternoon showers/t-storms westward over the interior portions of se GA/ne FL by Thu/Fri. It will also lead to high and low temperatures by Thu/Fri a few degrees lower than that for Mon/Tue.

MARINE.

High pressure will sit in place to our east, rendering generally southwesterly flow during the night and morning hours, switching to south-southeast winds in the afternoon and evening with the sea breeze. This daily sea breeze circulation will also bring chances for evening showers and thunderstorms. Seas will remain low, around 3 feet or less.

Rip Currents: NE FL - Moderate risk of rip currents through Monday. SE GA - Low risk of rip currents through Monday.

FIRE WEATHER.

Warm, humid, and unstable conditions will continue through the weekend with daily afternoon and evening showers and thunderstorms forming along both west and east coast sea breezes. These boundaries will collide across inland areas during the afternoon where a few strong to briefly severe storms will be possible. Weak transport winds and lower mixing heights across north-central Florida under strengthening high pressure will create low daytime dispersion across NE FL despite unstable low level conditions. Winds will be less than 15 mph each day, except locally strong and gusty around thunderstorms.

PRELIMINARY POINT TEMPS/POPS.

AMG 94 74 94 74 94 / 40 30 70 30 70 SSI 90 78 91 78 91 / 30 20 50 30 50 JAX 94 76 95 75 95 / 30 20 60 30 60 SGJ 91 76 92 75 91 / 20 10 50 20 60 GNV 94 74 94 74 94 / 40 30 60 20 70 OCF 95 74 94 74 94 / 40 30 60 20 70

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 mi69 min Calm G 1 74°F 83°F1021 hPa (+0.9)73°F
41117 15 mi43 min 83°F1 ft
GTXF1 - Guana Tolomato Matanzas Reserve, FL 16 mi84 min SW 1 72°F 1022 hPa71°F
LTJF1 35 mi57 min 75°F 73°F
MYPF1 - 8720218 - Mayport (Bar Pilots Dock), FL 36 mi51 min WSW 5.1 G 6 77°F 85°F1021 hPa
BLIF1 37 mi57 min WSW 4.1 G 5.1 77°F 1021.6 hPa77°F
DMSF1 37 mi51 min 86°F
NFDF1 40 mi51 min WSW 4.1 G 5.1 68°F 68°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 mi73 minN 010.00 miFair72°F71°F97%1020.9 hPa

Link to 5 minute data for KSGJ

Wind History from SGJ (wind in knots)
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Last 24hrCalmW4W4E5E7E7E10E10S5W4NW5W3CalmW3SW5SW4SW5W5NW5CalmNW4CalmS3Calm
1 day agoCalmSW4CalmE8E9E8E7SE11SE11SE13SE5NW9
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2 days agoS5SW4SW3E9SE9SE11SE10SE14
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Tide / Current Tables for St. Augustine, city dock, Florida
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St. Augustine
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Sat -- 12:02 AM EDT     4.59 feet High Tide
Sat -- 06:30 AM EDT     0.46 feet Low Tide
Sat -- 06:48 AM EDT     Sunrise
Sat -- 11:11 AM EDT     Moonset
Sat -- 12:26 PM EDT     4.21 feet High Tide
Sat -- 06:47 PM EDT     0.81 feet Low Tide
Sat -- 08:12 PM EDT     Sunset
Sat -- 11:23 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.64.33.52.61.70.90.50.511.82.83.74.24.13.62.821.30.90.81.11.82.73.6

Tide / Current Tables for East Tocoi, St. Johns River, Florida (4)
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East Tocoi
Click for Map
Sat -- 01:04 AM EDT     0.25 feet Low Tide
Sat -- 06:28 AM EDT     0.97 feet High Tide
Sat -- 06:49 AM EDT     Sunrise
Sat -- 11:12 AM EDT     Moonset
Sat -- 01:32 PM EDT     0.20 feet Low Tide
Sat -- 06:49 PM EDT     0.93 feet High Tide
Sat -- 08:13 PM EDT     Sunset
Sat -- 11:24 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.30.30.50.70.9110.90.70.60.40.30.20.20.30.50.80.90.90.90.80.70.6

Weather Map
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wmap_A
GEOS Local Image of    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 Jacksonville, FL (8,2,3,4)
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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.