Saturday, January23, 2021
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Marine Weather and Tides
Jacksonville 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 7:19AMSunset 5:55PM Saturday January 23, 2021 11:31 AM EST (16:31 UTC) Moonrise 1:39PMMoonset 2:51AM Illumination 78% Phase: Waxing Gibbous; Moon at 10 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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AMZ452 Expires:202101232215;;361674 Fzus52 Kjax 231336 Cwfjax Coastal Waters Forecast For Northeast Florida/southeast Georgia National Weather Service Jacksonville Fl 836 Am Est Sat Jan 23 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. Amz450-452-454-232215- 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- 836 Am Est Sat Jan 23 2021
Rest of today..Northeast winds 10 to 15 knots. Seas 3 to 4 feet with a dominant period 5 seconds. A moderate chop on the intracoastal waters.
Tonight..Northeast winds 10 to 15 knots. Seas 3 to 4 feet with a dominant period 6 seconds. A light chop on the intracoastal waters. Slight chance of showers after midnight.
Sunday..East winds 10 to 15 knots. Seas 3 to 4 feet with a dominant period 6 seconds. A moderate chop on the intracoastal waters. Slight chance of showers.
Sunday night..East winds 5 to 10 knots becoming southeast after midnight. Seas 2 to 3 feet. Mostly smooth on the intracoastal waters.
Monday..South winds 10 to 15 knots. Seas 3 to 4 feet. A moderate chop on the intracoastal waters.
Monday night..Southwest winds 10 to 15 knots. Seas 3 to 4 feet.
Tuesday..Southwest winds 10 to 15 knots. Seas 2 to 3 feet. Slight chance of showers and Thunderstorms.
Tuesday night..Southwest winds 5 to 10 knots. Seas 2 to 3 feet. Slight chance of showers and Thunderstorms.
Wednesday..South winds 5 to 10 knots. Seas 1 to 2 feet. Chance of showers and slight chance of Thunderstorms.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 836 Am Est Sat Jan 23 2021
Synopsis.. A weak cold front will move southward across the florida peninsula this afternoon as strong high pressure builds over the ohio valley. Northeasterly winds will strengthen and seas will build to caution levels offshore this afternoon. High pressure will then weaken as it slides off the carolina coast by Sunday evening, and the frontal boundary will lift northward as a warm front. Southerly winds will increase over our waters on Monday and will shift to southwesterly Monday evening ahead of a cold front that will be entering the southeastern states. This front will then stall over the georgia waters by late Tuesday as a wave of low pressure develops near the area by midweek.
Gulf stream.. The approximate location of the west wall of the gulf stream as of jan 23, 2021 at 1200 utc... 54 nautical miles east northeast of flagler beach. 61 nautical miles east of saint augustine beach. 74 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 Jacksonville Beach, FL
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location: 30.29, -81.36     debug


Area Discussion for - Jacksonville, FL
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FXUS62 KJAX 231345 AFDJAX

Area Forecast Discussion National Weather Service Jacksonville FL 845 AM EST Sat Jan 23 2021

UPDATE.

A cold front across northeast Florida this morning will slide south of the area this afternoon. A few light showers/sprinkles will remain possible along and ahead of the frontal boundary this morning. Low stratus will slowly improve across northeast Florida from north to south, exiting Marion County only briefly late in the day. Cloud cover will remain across northeast Florida, however, with scattered/broken ceilings in the 6-10kft range. For southeast Georgia, mostly sunny to sunny skies will prevail. Highs today will be in the low to mid 60s across the interior, and the upper 50s to around 60 at the beaches.

PREV DISCUSSION [601 AM EST].

NEAR TERM [Through Tonight].

High pressure will continue to strengthen as it builds into the Ohio Valley, which will push the wavy frontal boundary positioned across north central FL southward today, reaching south FL tonight. Locally dense fog will continue to expand across inland portions of southeast GA through the predawn hours as the northern edge of the low stratus deck edges southward, while drizzle and light showers sink to the south of the I-10 corridor before sunrise. Fog may expand towards the I-10 corridor through the early morning hours, while a drier air mass results in fog dissipating towards sunrise for locations north of Waycross. Lows early this morning will fall into the 40s for most of southeast GA, with temperatures remaining in the 50s for northeast FL, ranging to near 60 in north central FL.

Zonal flow aloft will continue across our region today, with heights aloft rising slightly overnight as shortwave troughing moves off the Mid-Atlantic coast. Surface ridging will wedge down the southeastern seaboard this afternoon, resulting in a tightening local pressure gradient and breezy northeasterly winds developing at coastal locations. A drier air mass will briefly advect southward over southeast GA and northeast FL as the day progresses, but stratus and mid-level cloudiness will be slow to erode over north central FL this afternoon as isentropic lift begins to strengthen over the FL peninsula. Onshore winds will keep highs in the upper 50s for coastal southeast GA and for coastal locations north of St. Augustine. Highs elsewhere will generally climb to the 60-65 degree range, except upper 60s in north central FL.

Mid-level cloud cover will thicken from south to north tonight as the frontal boundary stalls over south FL and then begins lifting northward as a warm front late at night. High pressure will weaken as it moves off the Carolina coast, resulting in veering low level winds and coastal trough development over the near shore Atlantic waters adjacent to northeast FL. Isentropic lift will also strengthen from south to north after midnight, with isolated light showers developing over north central FL during the predawn hours as stratus develops, with coverage of this stratus reaching the I-10 corridor towards sunrise, possibly accompanied by a few light showers or drizzle. Lows will fall to the low and mid 40s for inland southeast GA, where cloud cover will not thicken until the predawn hours. Lows will only fall to the low and mid 50s for locations south of I-10.

SHORT TERM [Sunday through Monday Night].

The surface ridge of high pressure will move off the mid-Atlantic coastline Sunday, with the weak inverted coastal trough along the FL Atlantic coastline slowly receding eastward through Sunday night. The coastal trough will keep a slight (20%) chance for showers in the forecast Sunday morning, with those showers shifting eastward through the afternoon and evening hours. Sunday will see highs in the low-mid 60s across SE GA, mid 60s-mid 70s across NE FL. Sunday night, temperatures will only dip into the 50s.

On Monday, an upper level shortwave trough will eject into the central Plains, developing a low pressure system which will drag a cold front through the lower Mississippi Valley Monday and into the southeast Monday night. Low end (20-30%) chances for showers return to the Suwannee Valley Monday night. Ahead of this system, temperatures will be warm with afternoon highs in the mid 70s to around 80 and overnight lows in the low 60s.

LONG TERM [Tuesday through Saturday].

The upper level energy driving the approaching front will decay as it lifts into the Ohio Valley, essentially stalling the front across S GA near the FL-GA border by Tuesday night. Another upper level shortwave will eject into the central Plains Tuesday night however, helping to reinvigorate the stalled surface boundary and allowing it to finally exit as a cold front Wednesday night. Heading into the end of the work week, deep layer ridging will build over the eastern CONUS and cooler, drier air will move into our area. Inland frost is possible Friday night/Saturday morning.

MARINE.

A slow moving frontal boundary positioned across north central Florida early this morning will sink southward through the Florida peninsula this afternoon as strong high pressure builds over the Ohio Valley and wedges down the southeastern seaboard. Northeasterly winds will strengthen to 15-20 knots and seas will build to Caution levels of 4-6 feet offshore this afternoon. Seas will build to 3-4 feet near shore. Caution conditions will continue offshore tonight as a coastal trough develops over the near shore waters. Seas will remain in the 4-6 foot range on Sunday as onshore winds prevail. High pressure will then weaken as it slides off the Carolina coast by Sunday evening, followed by the the front over the Florida peninsula lifting northward across our waters on Sunday night. Meanwhile, low pressure developing over Texas on Sunday night will lift northeastward across the Ozarks on Monday. Southerly winds will increase over our waters on Monday and will shift to southwesterly on Monday evening ahead of a cold front that will be entering the southeastern states. Caution conditions will prevail offshore on Monday and Tuesday, with speeds just below Caution levels near shore. This front will then stall over the Georgia waters by late Tuesday as a wave of low pressure develops near our region towards midweek.

Rip Currents: Strengthening northeasterly winds and building seas will create a moderate risk of rip currents at all area beaches today. This moderate risk will continue into Sunday as onshore winds persist.

FIRE WEATHER.

A weak inverted coastal trough will develop today and remain in place through Sunday. This will lead to generally light transport winds and low mixing heights across the area and lower end dispersions through the weekend. Today, dispersions will peak around 25 to 35 across much of the area, but dispersions Sunday will be even lower, around 15 to 25 across the area, with the Suwannee Valley region seeing those 15 to 20 values. The pattern will become more active with two cold fronts moving across the southeast Tuesday and Wednesday, then we'll end the week with cooler, drier (min RH around 40%) conditions as high pressure builds over the eastern CONUS.

PRELIMINARY POINT TEMPS/POPS.

AMG 61 42 61 52 75 / 0 10 20 10 10 SSI 57 48 61 54 72 / 0 20 20 20 10 JAX 61 49 66 56 78 / 10 20 20 10 0 SGJ 60 54 67 59 77 / 10 20 20 10 0 GNV 64 52 70 56 78 / 20 20 20 10 0 OCF 67 53 74 58 81 / 30 20 20 10 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
MYPF1 - 8720218 - Mayport (Bar Pilots Dock), FL 8 mi43 min 56°F 59°F1021.3 hPa
LTJF1 8 mi43 min 57°F 50°F
BLIF1 11 mi43 min 58°F 1021.9 hPa57°F
DMSF1 12 mi43 min 58°F
JXUF1 14 mi43 min 58°F
NFDF1 16 mi43 min 59°F 1020.8 hPa49°F
41117 25 mi35 min 61°F3 ft
FRDF1 - 8720030 - Fernandina Beach, FL 27 mi43 min 58°F 58°F1021.3 hPa
41112 - Offshore Fernandina Beach, FL (132) 29 mi61 min 55°F 59°F2 ft
SAUF1 - St. Augustine, FL 30 mi31 min N 15 G 17 57°F 60°F1020.9 hPa (+2.0)56°F
GTXF1 - Guana Tolomato Matanzas Reserve, FL 44 mi106 min N 8 58°F 1020 hPa56°F

Wind History for I-295 Bridge, St Johns River, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mayport Naval Station - Adm David L. McDonald Field, FL8 mi39 minN 10 G 1810.00 miFair59°F51°F75%1020.9 hPa
Jacksonville Craig Municipal Airport, FL9 mi38 minNE 510.00 miPartly Cloudy60°F51°F72%1020.9 hPa
Jacksonville Naval Air Station, FL17 mi38 minN 710.00 miMostly Cloudy58°F51°F78%1020.7 hPa
Jacksonville International Airport, FL22 mi35 minNNE 510.00 miMostly Cloudy59°F50°F72%1021 hPa
Northeast Florida Regional Airport, FL22 mi35 minN 87.00 miMostly Cloudy58°F56°F93%1021 hPa
Fernandina Beach Municipal Airport, FL23 mi36 minNE 710.00 miFair58°F52°F80%1021.3 hPa

Link to 5 minute data for KNRB

Wind History from NRB (wind in knots)
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2 days agoW7W11W9W10W8W6W3W3W35N644W3SW3W3W35W4W3Calm45SW6

Tide / Current Tables for Jacksonville Beach, Florida
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Jacksonville Beach
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Sat -- 02:51 AM EST     Moonset
Sat -- 03:31 AM EST     4.94 feet High Tide
Sat -- 07:20 AM EST     Sunrise
Sat -- 10:10 AM EST     1.20 feet Low Tide
Sat -- 01:38 PM EST     Moonrise
Sat -- 03:49 PM EST     4.37 feet High Tide
Sat -- 05:54 PM EST     Sunset
Sat -- 10:12 PM EST     0.74 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.53.54.44.94.94.53.832.21.51.21.422.83.64.24.44.13.42.61.81.10.70.9

Tide / Current Tables for St. Johns River Entrance, Florida Current (2) (expired 1999-12-31)
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St. Johns River Entrance
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Sat -- 01:10 AM EST     0.00 knots Slack
Sat -- 02:52 AM EST     Moonset
Sat -- 03:30 AM EST     1.68 knots Max Flood
Sat -- 06:28 AM EST     -0.00 knots Slack
Sat -- 07:20 AM EST     Sunrise
Sat -- 09:22 AM EST     -1.58 knots Max Ebb
Sat -- 01:38 PM EST     Moonrise
Sat -- 02:09 PM EST     0.00 knots Slack
Sat -- 03:55 PM EST     1.04 knots Max Flood
Sat -- 05:54 PM EST     Sunset
Sat -- 06:19 PM EST     -0.00 knots Slack
Sat -- 09:12 PM EST     -1.77 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.8-0.20.91.61.61.20.5-0.5-1.3-1.6-1.5-1.4-1.3-0.9-0.10.710.80.2-0.6-1.4-1.8-1.7-1.4

Weather Map
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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.