Saturday, January16, 2021
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Marine Weather and Tides
St. Augustine Beach, FL

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
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 7:18AMSunset 5:50PM Saturday January 16, 2021 2:51 AM EST (07:51 UTC) Moonrise 10:01AMMoonset 9:26PM Illumination 9% Phase: Waxing Crescent; Moon at 3 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 Coastal Waters From St. Augustine To Flagler Beach Fl Out 20 Nm- 752 Pm Est Fri Jan 15 2021
.small craft exercise caution...
Tonight..West winds 15 to 20 knots. Seas 3 to 4 feet with a dominant period 5 seconds. Choppy on the intracoastal waters. Chance of showers in the evening.
Saturday..West winds 15 to 20 knots. Seas 3 to 4 feet with a dominant period 4 seconds. Choppy on the intracoastal waters.
Saturday night..West winds 15 to 20 knots becoming northwest 10 to 15 knots after midnight. Seas 2 to 3 feet with a dominant period 4 seconds. Choppy on the intracoastal waters.
Sunday..West winds 5 to 10 knots. Seas 2 to 3 feet. A light chop on the intracoastal waters.
Sunday night..West winds 10 to 15 knots. Seas 2 to 3 feet. A light chop on the intracoastal waters.
Monday..Northwest winds 10 to 15 knots. Seas 2 to 3 feet. A moderate chop on the intracoastal waters.
Monday night..Northwest winds 5 to 10 knots. Seas 1 to 2 feet.
Tuesday..North winds 5 to 10 knots. Seas 2 feet.
Tuesday night..North winds 5 to 10 knots becoming northwest after midnight. Seas 1 to 2 feet.
Wednesday..Northwest winds 5 to 10 knots becoming north in the afternoon. Seas 1 to 2 feet.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 752 Pm Est Fri Jan 15 2021
Synopsis.. Gusty offshore flow is expected to develop tonight and continue on Saturday in the wake of cold frontal passage. Lighter winds expected Sunday into early next week as high pressure builds into the region.
Gulf stream.. The approximate location of the west wall of the gulf stream as of jan 14, 2021 at 1200 utc... 70 nautical miles east northeast of flagler beach. 77 nautical miles east of saint augustine beach. 88 nautical miles east of jacksonville beach. 105 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 Beach, FL
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location: 29.87, -81.26     debug


Area Discussion for - Jacksonville, FL
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FXUS62 KJAX 160524 AFDJAX

Area Forecast Discussion National Weather Service Jacksonville FL 1224 AM EST Sat Jan 16 2021

AVIATION. [Through 06Z Sunday]

VFR expected to prevail this TAF period, as the last of the low clouds and fog Friday evening have mostly moved out of the area as of 05Z. Westerly winds of 5-10 kt expected into the early morning hours. West winds expected to increase after 15z Saturday at 14-18 knots with gusts of 22-28 knots through the afternoon hours. Winds should relax by the evening hours.

PREV DISCUSSION [809 PM EST].

NEAR TERM [Through Tonight].

A cold front is pressing its way across the area from west to east this afternoon bringing widespread showery rain ahead of it. Scattered to numerous gusty showers are likely areawide before the front and back edge of showers exits offshore late this evening. Not much in the way of considerable rainfall with totals likely to be a quarter of an inch or less. Breezy winds around 10-15 mph will continue ahead of and with the showers, with gusts between 25-35 mph possible. A dry, cold airmass will funnel in behind the front, allowing lows to drop into the 30s and lower 40s tonight. A light breeze will persist overnight bringing wind chills down to the upper 20s across southeast GA and low to mid 30s across northeast FL.

In the wake of the cold front, cool and sunny conditions are expected on Saturday. Post-frontal westerly winds will remain strong and gusty through Saturday morning and afternoon as the local pressure gradient tightens in response to an intensifying surface low over the Northeastern US. Wind speeds are generally expected range between 15-25 mph with gusts as high as 40 mph. Gradients will begin to ease Saturday evening as upper trough axis pivots northeastward into the Atlantic. Saturday's highs will range in the low to mid 50s across southeast GA and mid to upper 50s across northeast Fl. Stronger cold air advection and light to near calm winds Saturday night will lead to widespread freeze and frost. Areas generally along and west of the I-95 corridor will have best chance at reaching freezing or subfreezing temps whereas coastal and beach communities will bottom out the upper/mid 30s.

SHORT TERM [Saturday Through Sunday Night].

After a clear sunny day on Saturday, high clouds will stream toward the area on southwesterly flow on Sunday as another upper trough approaches. The trough will round its way into and across the Deep South Sunday night, dragging an upper front with it. With the dry airmass in place the front isn't expected to result in any precip. Clouds will scatter out on Monday as the upper trough swings into the Atlantic and surface ridge axis extends into the region. Below normal temperatures will continue through the weekend and into early next with another light freeze possible for inland areas Monday night.

LONG TERM [Monday Through Friday].

Surface high pressure will settle over the region next week as the southern stream jet intensifies to our north. This intensified southern stream should shelter the region from any northern stream impulses. Under this sheltered regime, temperatures will gradually warm back to and then slightly above normal through next week. Chances for showers will creep back into the forecast late next week as the southern and northern streams merge and an impulse attempts to amplify southward toward the area, though this is predicated on the progressiveness and flattening of the ridging aloft.

MARINE.

Gusty south-southwesterly winds will continue over the offshore waters this afternoon ahead an approaching cold front. A Small Craft Advisory is now in effect for the offshore waters, expanding to nearshore waters north of St. Augustine late Saturday morning with gusty post-frontal westerly winds between 15-25 knots. Conditions will improve by Sunday as the upper disturbance pivots away and high pressure begins to build toward the region. High pressure will dominate through the middle of next week resulting in smooth boating conditions.

Rip Currents: Low Risk through the weekend with prevailing offshore flow.

FIRE WEATHER.

Breezy conditions will continue ahead of the cold front pressing through the region this afternoon and evening. Scattered to numerous will accompany the front as it pushes through this evening. Winds will shift westerly behind the front remaining gusty through Saturday. Strong transport winds and deep mixing will lead to very high afternoon dispersions through the weekend. A dry, cold airmass will filter in behind the front with afternoon 30-45% through the weekend. Combination of dryness and breeziness on Saturday will lead to elevated fire weather conditions. Winds will relax Sunday and remain light through middle of next week as high pressure builds into and over the region.

PRELIMINARY POINT TEMPS/POPS.

AMG 53 29 55 34 57 / 0 0 0 0 0 SSI 55 36 55 39 58 / 0 0 0 0 0 JAX 58 32 59 38 60 / 0 0 0 0 0 SGJ 60 36 59 42 60 / 0 0 0 0 0 GNV 59 32 60 37 61 / 0 0 0 0 0 OCF 60 34 61 42 63 / 0 0 0 0 0

JAX WATCHES/WARNINGS/ADVISORIES. FL . None. GA . None. AM . Small Craft Advisory until 10 PM EST this evening for Waters from Altamaha Sound GA to Fernandina Beach FL from 20 to 60 NM-Waters from Fernandina Beach to St. Augustine FL from 20 to 60 NM-Waters from St. Augustine to Flagler Beach FL from 20 to 60 NM.

Small Craft Advisory from 10 AM this morning to 10 PM EST this evening for Coastal waters from Altamaha Sound to Fernandina Beach FL out 20 NM-Coastal waters from Fernandina Beach to St. Augustine FL out 20 NM.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SAUF1 - St. Augustine, FL 1 mi52 min W 7 G 9.9 50°F 59°F1011.7 hPa (+1.4)43°F
41117 13 mi56 min 60°F3 ft
GTXF1 - Guana Tolomato Matanzas Reserve, FL 15 mi67 min W 4.1 50°F 1012 hPa44°F
LTJF1 37 mi52 min 51°F 43°F
JXUF1 38 mi52 min 57°F
MYPF1 - 8720218 - Mayport (Bar Pilots Dock), FL 38 mi52 min WSW 12 G 16 51°F 58°F1011.2 hPa (+1.4)
BLIF1 39 mi52 min W 9.9 G 13 51°F 1012.1 hPa (+1.5)48°F
DMSF1 39 mi52 min 58°F
NFDF1 41 mi52 min W 5.1 G 9.9 46°F 1011.1 hPa (+1.6)

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, FL8 mi56 minW 610.00 miFair49°F42°F77%1011.7 hPa

Link to 5 minute data for KSGJ

Wind History from SGJ (wind in knots)
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Last 24hrW6W4SW3S5S6S6S8S7S11SW8SW10
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1 day agoW6W5W4W3W3CalmNW4NW6N8W76W8W9W5SW3S5S5SW4SW3SW5S4SW5SW4W8
2 days agoNW7NW6NW7NW6N6NW7N6NW5W4CalmW6W9W7W3W4CalmCalmW4W6W4W5W5W5W5

Tide / Current Tables for St. Augustine Beach, Florida (2)
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St. Augustine Beach
Click for Map
Sat -- 04:02 AM EST     0.07 feet Low Tide
Sat -- 07:21 AM EST     Sunrise
Sat -- 10:01 AM EST     Moonrise
Sat -- 10:29 AM EST     5.26 feet High Tide
Sat -- 04:42 PM EST     0.21 feet Low Tide
Sat -- 05:48 PM EST     Sunset
Sat -- 09:26 PM EST     Moonset
Sat -- 10:43 PM EST     4.67 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.62.51.30.40.10.41.32.53.64.65.25.24.63.52.31.10.40.20.81.72.83.84.54.6

Tide / Current Tables for East Tocoi, St. Johns River, Florida (4)
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East Tocoi
Click for Map
Sat -- 04:43 AM EST     0.85 feet High Tide
Sat -- 07:22 AM EST     Sunrise
Sat -- 10:02 AM EST     Moonrise
Sat -- 11:36 AM EST     -0.19 feet Low Tide
Sat -- 05:09 PM EST     0.98 feet High Tide
Sat -- 05:50 PM EST     Sunset
Sat -- 09:27 PM EST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.2-00.30.60.80.80.80.60.30.1-0.1-0.2-0.2-00.30.60.910.90.80.60.30.1-0.1

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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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.