Monday, November30, 2020
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Marine Weather and Tides
St. Marys, GA

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 7:04AMSunset 5:25PM Monday November 30, 2020 11:52 AM EST (16:52 UTC) Moonrise 5:46PMMoonset 7:13AM Illumination 100% Phase: Full Moon; Moon at 15 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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AMZ450 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- 1028 Am Est Mon Nov 30 2020
.small craft advisory in effect through Tuesday morning...
This afternoon..West winds 15 to 20 knots with gusts to 30 knots. Seas 3 to 4 feet with a dominant period 6 seconds. Choppy on the intracoastal waters.
Tonight..West winds 20 to 25 knots with gusts to 30 knots. Seas 3 to 4 feet with a dominant period 4 seconds. Rough on the intracoastal waters.
Tuesday..Northwest winds 20 to 25 knots diminishing to 15 to 20 knots in the afternoon. Seas 3 to 4 feet with a dominant period 5 seconds. Rough on the intracoastal waters.
Tuesday night..Northwest winds 15 to 20 knots diminishing to 10 to 15 knots after midnight. Seas 2 to 3 feet. Choppy on the intracoastal waters.
Wednesday..North winds 10 to 15 knots. Seas 2 to 3 feet. A moderate chop on the intracoastal waters.
Wednesday night..Northeast winds 10 to 15 knots. Seas 2 to 3 feet.
Thursday..East winds 10 to 15 knots. Seas 3 to 4 feet.
Thursday night..Southeast winds 10 to 15 knots. Seas 3 to 4 feet. Slight chance of showers.
Friday..South winds 5 to 10 knots. Seas 3 to 4 feet. Slight chance of showers.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 1028 Am Est Mon Nov 30 2020
Synopsis.. Fast-moving cold front and associated line of showers and embedded Thunderstorms will press further into the atlantic and out of local waters over the next hour (by noon). In its wake, gusty offshore flow will continue over the waters, building seas to 6-8 feet in the outer waters tonight; hazardous small craft conditions will continue through tomorrow. High pressure will slide over the area Wednesday as it builds northeastward toward the mid atlantic region. This will lighten and veer winds onshore, improving small craft conditions. Another low pressure will encroach from the nw late this week, bringing another frontal passage over the weekend. The approximate location of the west wall of the gulf stream as of nov 28, 2020 at 1200 utc... 56 nautical miles east of flagler beach. 68 nautical miles east of saint augustine beach. 81 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 St. Marys, GA
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location: 30.72, -81.55     debug


Area Discussion for - Jacksonville, FL
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FXUS62 KJAX 301252 AFDJAX

Area Forecast Discussion National Weather Service Jacksonville FL 752 AM EST Mon Nov 30 2020

. COOLER & BREEZY TODAY FOLLOWING MORNING COLD FRONT .

. HIGH CONFIDENCE OF INLAND FREEZE & FROST TUE NIGHT .

UPDATE.

Pre-frontal rain will clear our SE zones within the next 2 hrs, trailed quickly by the surface cold front noted by a thin line of light showers/sprinkles currently on the doorstep of JAX. Gusty winds of 30-35 mph continued between the front and the departing rainfall, with post-frontal gusts of 20-30 mph across SE GA and Suwannee River Valley.

Breezy, cooler conditions will continue today with high temperatures generally in the 60s for most locations with mid to upper 50s across SE GA where more persistent low level wrap-around cloudiness will continue into the afternoon, with partly cloudy skies expected for much of NE FL.

Much colder, drier air mass tonight with a few inland locations nearing freezing across our far western zones from Hazlehurst southward toward Suwannee County. Elevated winds combined with the cold temps will create wind chills Tue morning in the 20s for inland areas to near 30 along the coast - bundle up - winter for us begins!

MARINE.

Small craft advisory in place through Tuesday with occasional gusts near gale force this morning as convection and cold front sweep across the local waters. Winds gradually decrease tonight into Tue as high pressure builds in from the west.

Rip Currents: Moderate risk.

PREV DISCUSSION [538 AM EST].

Near Term. [through Tonight] .

Strong cold front will move east southeast across the region this morning. Expect it to be east of the area by noon. Continued potential for strong wind gusts in storms ahead of and along the boundary, and can not rule out potential for an isolated tornado due to shear and frontal convergence. Clearing will follow the front, but wrap around moisture is expected to pivot across SE GA. The combination of the cloud cover and cold advection will cause temperatures to fall through the afternoon across SE GA, whereas the sunshine should help keep temperatures fairly steady through much of the day time hours over NE FL. In general, highs Today will be recorded this morning. It will also be fairly breezy Today.

For Tonight, skies will clear from the northwest, with high pressure building from the west. The gradient will remain fairly tight through the night, so winds will continue to stir overnight. The winds will minimize frost formation despite lows in the 30s. Low temperatures near or at freezing possible well inland, but not expecting to be at or below 32 long enough to warrant a freeze warning at this point.

SHORT TERM [Tuesday through Wednesday Night].

. WIDESPREAD INLAND LIGHT FREEZE EVENT EXPECTED TUESDAY NIGHT .

Tuesday . Sunny skies and cold conditions as Meteorological Winter begins on 12/1 and gusty Northwest winds continue at 15-20 mph with gusts of 25-30 mph and strong cold air advection will hold Max Temps around 50 degrees across SE GA and lower/middle 50s for NE FL.

Tuesday Night . As cold high pressure settles over the region expect NW winds to decrease to less than 5 mph and along with mostly clear skies will set up good radiational cooling conditions and a widespread light freeze is expected over all inland areas, with lows in the upper 20s across SE GA and near 30 degrees across inland NE FL and Freeze headlines will likely be required. Some light frost will be possible as well by early Wednesday morning as winds become near calm in wind sheltered areas.

Wednesday . High pressure continues to push Northeast of the region and surface winds become light Northeast and under Mostly Sunny skies Max Temps will modify slightly into the middle 50s SE GA and upper 50s/near 60 degrees across NE FL. Upper level cloud cover increases Wed Night but another night of widespread low temps in the 30s possible over inland areas and 40s along the Atlc Coast and another brief light freeze not out of the question for inland SE GA areas near the Altamaha River Basin.

LONG TERM [Thursday Through Sunday].

Thursday . Mainly dry conditions with increasing high clouds ahead of next frontal system and expect milder temps with the onshore flow off the Atlantic as Sfc High pressure builds into the Carolinas. Max Temps into the 60s across SE GA and near 70 across NE FL.

Friday . Long-range models have backed off the intensity of next shortwave trof energy/moisture available and now rainfall chances are mainly in the 20-40% range with the next frontal passage. Max Temps will likely reach into the 70-75 degree range and lows falling into the 40s/50s Fri Night.

Sat/Sun . Models struggling to handle the expected mid level cut-off low feature to push across the SE US over the weekend, but for now it appears as though it will not phase with moisture over the Gulf of Mexico and cross the NE FL/SE GA region with mainly dry conditions and seasonably cool temps with Highs in the 60s and lows in the 40s, but confidence remains low in the model solutions from the Friday through Sunday time frame.

AVIATION. [Through 12Z Tuesday]

Strong front with showers and embedded storms along and ahead of it will move east of the region early this period. Elevated winds above the surface will result in low level wind shear potential ahead of the front. Once the front passes, a trend toward VFR is expected with winds mixing down and becoming gusty. Winds will diminish this evening, with VFR expected through the night.

FIRE WEATHER.

On Tuesday, much colder and drier airmass will combine with gusty Northwest winds and humidity values falling into the 30 to 35 percent range to provide for more hazardous fire weather conditions but for now expect values to stay just above critical levels.

PRELIMINARY POINT TEMPS/POPS.

AMG 61 33 49 27 56 / 0 10 0 0 0 SSI 68 37 50 34 56 / 70 10 0 0 0 JAX 68 35 53 30 58 / 70 0 0 0 0 SGJ 69 38 54 36 59 / 70 0 0 0 0 GNV 68 34 53 29 57 / 30 0 0 0 0 OCF 69 36 54 30 59 / 60 0 0 0 0

JAX WATCHES/WARNINGS/ADVISORIES. FL . None. GA . None. AM . Small Craft Advisory until 11 PM EST Tuesday 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 until 11 AM EST Tuesday 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-Coastal waters from St. Augustine to Flagler Beach FL out 20 NM.


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
FRDF1 - 8720030 - Fernandina Beach, FL 5 mi53 min W 11 G 19 65°F 1010.5 hPa (+2.6)
41112 - Offshore Fernandina Beach, FL (132) 14 mi53 min 63°F 69°F4 ft
NFDF1 22 mi53 min W 6 G 15 62°F 1010.7 hPa (+2.3)
BLIF1 23 mi53 min WNW 13 G 19 65°F 1011.6 hPa (+2.2)55°F
DMSF1 23 mi65 min 70°F
MYPF1 - 8720218 - Mayport (Bar Pilots Dock), FL 23 mi53 min W 16 G 21 65°F 1010.7 hPa (+2.2)
LTJF1 24 mi53 min 65°F 53°F
JXUF1 26 mi65 min 70°F
SAXG1 - Sapelo Island Reserve, GA 50 mi53 min W 18 63°F 1009 hPa (+3.0)53°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 59 mi63 min W 23 G 27 65°F 70°F6 ft1007.9 hPa (+3.0)57°F

Wind History for Fernandina Beach, FL
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fernandina Beach Municipal Airport, FL9 mi58 minWNW 14 G 1910.00 miPartly Cloudy63°F57°F81%1010.5 hPa
Jacksonville International Airport, FL17 mi57 minW 1610.00 miMostly Cloudy62°F52°F70%1010.8 hPa
Mayport Naval Station - Adm David L. McDonald Field, FL24 mi61 minW 17 G 2310.00 miMostly Cloudy66°F52°F61%1010.1 hPa

Link to 5 minute data for KFHB

Wind History from FHB (wind in knots)
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Last 24hrN6N4NW4NE4E6E4E4E5E5SE5S8S8SW6S10S9S11S11S14
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1 day agoCalmCalmS4SW5N12
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2 days agoCalmE5NE4E8E8E3S3CalmCalmCalmCalmSW4CalmCalmS4SW3S4S4SW4W3NW3NW4W4NW5

Tide / Current Tables for St. Marys, St. Marys River, Florida
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St. Marys
Click for Map
Mon -- 02:45 AM EST     0.10 feet Low Tide
Mon -- 04:32 AM EST     Full Moon
Mon -- 07:05 AM EST     Sunrise
Mon -- 07:13 AM EST     Moonset
Mon -- 09:13 AM EST     6.57 feet High Tide
Mon -- 03:24 PM EST     0.39 feet Low Tide
Mon -- 05:24 PM EST     Sunset
Mon -- 05:45 PM EST     Moonrise
Mon -- 09:30 PM EST     5.60 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.71.30.40.10.82.13.656.16.66.45.54.12.51.20.50.61.42.63.84.95.55.54.8

Tide / Current Tables for St. Johns River Entrance, Florida Current (3)
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St. Johns River Entrance
Click for Map
Mon -- 12:35 AM EST     -1.88 knots Max Ebb
Mon -- 04:29 AM EST     0.00 knots Slack
Mon -- 04:32 AM EST     Full Moon
Mon -- 07:05 AM EST     Sunrise
Mon -- 07:13 AM EST     Moonset
Mon -- 07:33 AM EST     2.65 knots Max Flood
Mon -- 10:45 AM EST     -0.01 knots Slack
Mon -- 01:19 PM EST     -1.95 knots Max Ebb
Mon -- 05:24 PM EST     Sunset
Mon -- 05:35 PM EST     0.00 knots Slack
Mon -- 05:45 PM EST     Moonrise
Mon -- 07:57 PM EST     1.88 knots Max Flood
Mon -- 10:43 PM EST     -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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-1.8-1.8-1.5-0.9-0.30.41.62.52.621-0.3-1.5-1.9-1.9-1.5-1-0.50.41.51.91.50.8-0.3

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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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.