Tuesday, September29, 2020
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L-36.com

Marine Weather and Tides
Atlantic 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 7:17AMSunset 7:14PM Tuesday September 29, 2020 11:28 PM EDT (03:28 UTC) Moonrise 5:29PMMoonset 4:10AM 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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AMZ452 Expires:202009300915;;567539 Fzus52 Kjax 292339 Cwfjax Coastal Waters Forecast For Northeast Florida/southeast Georgia National Weather Service Jacksonville Fl 739 Pm Edt Tue Sep 29 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. Amz450-452-454-300915- 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- 739 Pm Edt Tue Sep 29 2020
.small craft exercise caution...
Tonight..West winds 10 to 15 knots becoming northwest 15 to 20 knots in the evening, then diminishing to 10 to 15 knots after midnight increasing to 15 to 20 knots late in the night. Seas 3 to 4 feet with a dominant period 8 seconds. Choppy on the intracoastal waters. Showers early in the evening. Slight chance of Thunderstorms early in the evening. Showers likely in the evening, then slight chance of showers after midnight.
Wednesday..North winds 10 to 15 knots. Seas 2 to 3 feet with a dominant period 8 seconds. A moderate chop on the intracoastal waters.
Wednesday night..North winds 5 to 10 knots. Seas 2 to 3 feet with a dominant period 8 seconds. Mostly smooth on the intracoastal waters.
Thursday..North winds 5 to 10 knots becoming northeast in the afternoon. Seas 2 to 3 feet. A light chop on the intracoastal waters.
Thursday night..Northeast winds 5 to 10 knots becoming northwest after midnight. Seas 2 to 3 feet. Mostly smooth on the intracoastal waters.
Friday..North winds 10 to 15 knots. Seas 3 to 4 feet. A moderate chop on the intracoastal waters.
Friday night..Northeast winds 10 to 15 knots. Seas 3 to 4 feet.
Saturday..Northeast winds 15 to 20 knots. Seas 3 to 4 feet. Chance of showers.
Saturday night..Northeast winds 15 to 20 knots diminishing to 10 to 15 knots after midnight. Seas 3 to 4 feet. Chance of showers and slight chance of Thunderstorms.
Sunday..Northeast winds 10 to 15 knots. Seas 3 to 4 feet. Chance of showers and slight chance of Thunderstorms.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 739 Pm Edt Tue Sep 29 2020
Synopsis.. A strong cold front will exit the region tonight. High pressure will build from the west overnight through Wednesday. High pressure will stretch across the area Thursday. Following a trough of low pressure Thursday night, strong high pressure will build to the northwest Friday, then to the north over the weekend. The possibility exists for an inverted trough to develop over the coastal waters later this weekend.
Gulf stream.. The approximate location of the west wall of the gulf stream as of sep 29, 2020 at 1200 utc... 62 nautical miles east northeast of flagler beach. 65 nautical miles east of saint augustine beach. 72 nautical miles east of jacksonville beach. 89 nautical miles east southeast of st simons island. This data courtesy of the naval oceanographic office.


7 Day Forecast for Marine Location Near Atlantic Beach, FL
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location: 30.39, -81.4     debug


Area Discussion for - Jacksonville, FL
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FXUS62 KJAX 292336 AFDJAX

Area Forecast Discussion National Weather Service Jacksonville FL 736 PM EDT Tue Sep 29 2020

UPDATE.

A cold front currently stretches from just north of St. Augustine to near Gainesville to near Crystal River. Light rain, low hanging clouds, and gusty northwest winds are moving through the area in the wake of the front. Temperatures are already in the low-mid 60s behind the front and dewpoints are in the upper 50s to low 60s. The front is moving east-southeastward at a good clip and should exit the AOR in the next couple of hours, with rain and cloud cover gradually clearing out behind it. Lows are expected to dip into the mid 50s in SE GA tonight, upper 50s to low 60s in NE FL.

AVIATION. [Through 00Z Thursday]

Cold front will continue to push through the area over the next couple hours, with a shift to northwesterly winds. Gusty winds right along the front near JAX/VQQ/CRG will lower in speed over the next few hours then become more northerly at all sites through the period. IFR-MVFR cigs possible behind the front through around 06Z, but should improve to VFR overnight as drier air moves into the region. VFR conditions should prevail during the day Wednesday.

PREV DISCUSSION [257 PM EDT].

Near Term. /through Wednesday/ .

Strong cold front moving east across forecast area this afternoon will pass east of the region this evening. Strong to isolated severe storms will remain a possibility into this evening, with locally heavy rainfall. The better upper support trails well behind the frontal zone, and passes through in the drying airmass. So, diurnal instability and frontal convergence will be main factors in producing convective activity.

High pressure will build from the west overnight, with rainfall ending from west to east. Skies will clear through the day Wednesday, as a much drier airmass advects into region. Dewpoints will fall about 20 degrees from this afternoon to Wednesday afternoon.

Temperatures will trend above normal Today, then below normal for Wednesday.

Short Term. /Wednesday night through Saturday/ .

Ridge of high pressure will stretch across the region Wednesday night into Thursday with a dry period expected. A trough of low pressure will move southeast across region Thursday night into Friday morning. Little moisture is associated with this feature, so it is expected to pass dry. Strong high pressure will build from the northwest Friday, then to the north Friday night through Saturday. A period of enhanced onshore flow expected heading into the weekend due to location of high. Any troughing which develops in the flow would further enhance wind gusts along the coast, and help provide chance for coastal showers.

The airmass during this period will be noticeably cooler and drier. While expected sunshine will keep high temperatures near normal. The dry air will allow overnight lows to dip below normal.

Long Term. /Saturday night through Tuesday/ .

Surface high pressure will remain to the north this period, continuing the onshore flow pattern. Inverted troughing along the coast will result in increasing chances for showers, as well as bringing a return to higher dewpoints across NE FL. Long range models diverge in the Sunday to Tuesday timeframe regarding strength of coastal trough. ECMWF has a stronger trough along the coast, which gets caught up in an upper low early next week, helping it develop further. GFS is much weaker with coastal troughing. At this point, will trend forecast for late this weekend into early next week to scattered precipitation, and refine as models come into better agreement.

Temperatures are expected to trend near normal for this period.

Marine.

A strong cold front will move across the region through this evening. High pressure will build from the west overnight through Wednesday. High pressure will stretch across the area Thursday. Following a trough of low pressure Thursday night, strong high pressure will build to the northwest Friday, then to the north over the weekend. The possibility exists for an inverted trough to develop over the coastal waters later this weekend. Rip Currents: SE GA: Low through Wednesday NE FL: Low through Wednesday

PRELIMINARY POINT TEMPS/POPS.

AMG 55 78 54 82 57 / 60 0 0 0 0 SSI 61 77 61 80 63 / 70 0 0 0 0 JAX 59 78 58 82 61 / 70 0 0 0 0 SGJ 64 77 64 82 64 / 60 0 0 10 0 GNV 62 79 56 82 58 / 70 0 0 0 0 OCF 62 79 58 83 60 / 70 0 0 10 0

JAX WATCHES/WARNINGS/ADVISORIES. FL . Flood Watch until 9 PM EDT this evening for Coastal Flagler- Coastal St. Johns-Inland Flagler-Inland St. Johns.

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 2 mi59 min NW 8.9 G 14 65°F 80°F1013.9 hPa
LTJF1 3 mi59 min 65°F 60°F
BLIF1 7 mi59 min WNW 6 G 8.9 64°F 1014.7 hPa64°F
DMSF1 8 mi59 min 81°F
JXUF1 12 mi59 min 80°F
NFDF1 12 mi59 min Calm G 4.1 56°F 1013.6 hPa
FRDF1 - 8720030 - Fernandina Beach, FL 20 mi59 min WNW 11 G 17 69°F 79°F1013.6 hPa
41112 - Offshore Fernandina Beach, FL (132) 23 mi59 min 67°F 79°F3 ft
41117 32 mi63 min 82°F5 ft
SAUF1 - St. Augustine, FL 38 mi89 min NNW 8 G 11 65°F 81°F1013.5 hPa (+3.4)61°F
GTXF1 - Guana Tolomato Matanzas Reserve, FL 51 mi104 min NNW 6 66°F 1014 hPa64°F

Wind History for Fernandina Beach, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Mayport Naval Station - Adm David L. McDonald Field, FL1 mi37 minNW 810.00 miMostly Cloudy65°F61°F87%1013.7 hPa
Jacksonville Craig Municipal Airport, FL8 mi36 minNW 910.00 miPartly Cloudy65°F60°F84%1014.1 hPa
Fernandina Beach Municipal Airport, FL16 mi1.9 hrsNW 910.00 mi63°F60°F90%1012.9 hPa
Jacksonville International Airport, FL17 mi33 minWNW 710.00 miOvercast62°F60°F93%1014.3 hPa
Jacksonville Naval Air Station, FL18 mi36 minNNW 910.00 miMostly Cloudy64°F59°F84%1014.1 hPa

Link to 5 minute data for KNRB

Wind History from NRB (wind in knots)
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1 day agoSE9SE9SE10--S4SW4SW4S4S3SW6SW7SW9SW9W6W8W3SW4S6SE5SE5S5S4S3SW6
2 days agoS3CalmCalmCalmCalmCalmNE4CalmN4NE10NE11NE9NE8NE8NE9E7E6NE9NE10E9NE9E9E10E10

Tide / Current Tables for St. Johns River at Navy degaussing structure, Florida
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St. Johns River at Navy degaussing structure
Click for Map
Tue -- 01:00 AM EDT     -1.97 feet Low Tide
Tue -- 05:10 AM EDT     Moonset
Tue -- 07:18 AM EDT     Sunrise
Tue -- 07:21 AM EDT     2.46 feet High Tide
Tue -- 01:13 PM EDT     -1.52 feet Low Tide
Tue -- 06:28 PM EDT     Moonrise
Tue -- 07:12 PM EDT     Sunset
Tue -- 07:38 PM EDT     2.73 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.7-2-1.7-0.90.11.122.42.31.70.6-0.4-1.1-1.5-1.4-0.70.21.122.62.72.11.1-0.1

Tide / Current Tables for St. Johns River Entrance, Florida Current (2) (expired 1999-12-31)
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St. Johns River Entrance
Click for Map
Tue -- 01:10 AM EDT     -2.04 knots Max Ebb
Tue -- 04:35 AM EDT     0.00 knots Slack
Tue -- 05:10 AM EDT     Moonset
Tue -- 06:52 AM EDT     1.74 knots Max Flood
Tue -- 07:18 AM EDT     Sunrise
Tue -- 09:34 AM EDT     -0.00 knots Slack
Tue -- 01:11 PM EDT     -2.07 knots Max Ebb
Tue -- 04:51 PM EDT     0.00 knots Slack
Tue -- 06:28 PM EDT     Moonrise
Tue -- 07:12 PM EDT     Sunset
Tue -- 07:13 PM EDT     1.95 knots Max Flood
Tue -- 10:02 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.9-2-2-1.7-0.80.61.51.71.50.7-0.5-1.4-1.9-2.1-2-1.8-1.10.21.41.91.81.20.1-1.1

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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Jacksonville, FL
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