Thursday, January28, 2021
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Marine Weather and Tides
St. Marys, GA

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 7:18AMSunset 6:00PM Thursday January 28, 2021 3:57 AM EST (08:57 UTC) Moonrise 5:59PMMoonset 7:25AM 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- 226 Am Est Thu Jan 28 2021
.gale warning in effect until 1 pm est this afternoon...
Today..North winds 20 to 25 knots diminishing to 15 to 20 knots late in the afternoon. Seas 4 to 6 feet with a dominant period 6 seconds. Rough on the intracoastal waters.
Tonight..North winds 15 to 20 knots diminishing to 10 to 15 knots after midnight. Seas 3 to 5 feet with a dominant period 5 seconds. Choppy on the intracoastal waters.
Friday..North winds 10 to 15 knots becoming northeast 5 to 10 knots in the afternoon. Seas 3 to 4 feet with a dominant period 8 seconds. A moderate chop on the intracoastal waters.
Friday night..Northeast winds 5 to 10 knots. Seas 3 to 4 feet. Mostly smooth on the intracoastal waters.
Saturday..East winds 10 to 15 knots. Seas 3 to 4 feet. A moderate chop on the intracoastal waters.
Saturday night..South winds 10 to 15 knots. Seas 3 to 5 feet.
Sunday..South winds 15 to 20 knots. Seas 3 to 4 feet. Chance of showers and slight chance of Thunderstorms.
Sunday night..Southwest winds 15 to 20 knots becoming west 10 to 15 knots after midnight. Seas 3 to 4 feet. Showers likely and slight chance of Thunderstorms.
Monday..West winds 15 to 20 knots. Seas 3 to 4 feet.
AMZ400 Synopsis For Altamaha Sound Ga To Flagler Beach Fl Out To 60 Nm- 226 Am Est Thu Jan 28 2021
Synopsis.. The low pressure system that brought us Wednesday's cold front will continue to sweep eastward through the north atlantic waters today, with a strong ridge of high pressure building eastward behind it. This will keep strong northerly winds of 15 to 25 knots with gusts to 35 to 40 knots in place through the afternoon, then slacken overnight as that ridge move in. That ridge to our north will keep fair boating conditions in place through Saturday night. Our next cold front will then cross the area Sunday into Sunday night. The region will be between the exiting low to the east northeast and building high to the west northwest Monday into Tuesday.
Gulf stream.. The approximate location of the west wall of the gulf stream as of jan 28, 2021 at 1200 utc... 75 nautical miles east of flagler beach. 87 nautical miles east of saint augustine beach. 99 nautical miles east of jacksonville beach. 108 nautical miles east 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 280823 AFDJAX

Area Forecast Discussion National Weather Service Jacksonville FL 323 AM EST Thu Jan 28 2021

NEAR TERM [Through Tonight].

A blustery cold day is on tap as a much drier, colder air mass builds over our area through the day. Highs in SE GA will be in the mid 50s, upper 50s to near 60 in NE FL. Strong winds from the north at around 15 mph with gusts to 25 mph. Winds will gradually lighten through the evening hours and finally become calm (or at least light and variable) overnight. Min temps tonight will be in the low to mid 30s, so much of the area is expected to see frost by early Friday morning.

SHORT TERM [Friday Through Saturday].

High pressure will gradually weaken over the Ohio Valley and the southeastern states on Friday, with low level flow veering to northeasterly shortly after sunrise. Seasonably cool weather will continue, with highs reaching the 55-60 degree range inland, except lower 60s for north central FL. However, breezy northeasterly winds will keep coastal highs in the low to mid 50s. Inland winds will decouple towards sunset, setting up another frosty night at inland locations, where lows will fall to the low and mid 30s. A light onshore breeze will keep coastal lows in the upper 30s and lower 40s, with temperatures at the coast likely rising a few degrees during the predawn hours as low level flow continues to veer.

Another deep trough that will crash onshore along the California coast on Friday morning will quickly progress eastward, crossing the Rockies on Friday night and emerging over the Southern Plains State by early Saturday. Surface low pressure will deepen over the Southern Plains on Saturday and will be positioned near St. Louis by sunrise on Sunday. Meanwhile, cool high pressure along the Carolina coast on Saturday will move offshore, while another high pressure center over Hudson Bay wedges down the Appalachians on Sunday. Flow aloft will become zonal over our region on Saturday, and low level flow will continue to veer to southeasterly. Marine stratocumulus will begin to advect onshore within the deepening southeasterly flow pattern by Saturday afternoon, with high altitude cloud cover also increasing from the west. Highs will be near late January climatology, with 60-65 at most locations, except upper 60s in north central FL.

Warm frontogenesis will take place over Georgia on Saturday night as a wedge of cold air gets trapped to the east of the Appalachians ahead of the approaching storm system. Low level flow will veer to southerly, and strengthening warm air advection will result in lows only falling to the upper 40s and lower 50s, except mid 50s along the northeast FL coast.

LONG TERM [Sunday Through Thursday].

Low pressure will slowly weaken while decelerating over the Ohio Valley on Sunday, followed by secondary cyclogenesis along a warm front over the coastal Carolina region. Deep west-southwesterly flow will overspread our region by early Sunday as troughing aloft digs into the southeastern states. Model soundings depict bulk speed shear values of 50-60 knots overspreading our area during the afternoon and early evening hours ahead of this storm system's strengthening cold front. This weather pattern will advect a narrow ribbon of moisture northeastward from the Gulf of Mexico across our area, with showers and a few embedded elevated thunderstorms traversing our region from Sunday afternoon through the predawn hours on Monday. Breezy southwesterly winds will push highs well into the 70s on Sunday afternoon, except around 70 for locations near the Altamaha and Ocmulgee Rivers. The strong cold front will cross our region late on Sunday night, with a surge of cold air advection arriving during the predawn hours dropping lows to the 40s inland, ranging to the lower 50s for north central FL and the northeast FL coast.

Deep troughing aloft will cutoff over the Ohio Valley on Sunday night and will then linger along the Mid-Atlantic coast through Tuesday night. This feature will result in a deepening surface cyclone off the Delmarva coast on Monday morning that will move slowly northward along the New England coast through Wednesday morning before reaching the Canadian Maritime region by Wednesday night. The base of this stacked trough will pivot across our region on Monday night, followed by deep and dry northwesterly flow through midweek. Skies will rapidly clear from northwest to southeast on Monday morning, with wrap-around cold air stratocumulus associated with upper troughing then invading southeast GA on Monday afternoon and evening. Highs will fall back to below early February climatology for the early and middle portions of next week, with Tuesday likely being the coldest day of this event, as highs remain in the 50s area-wide. A few nights of inland light freezes will be possible on Monday and Tuesday nights, with frosty conditions continuing inland on Wednesday night.

AVIATION. [Through 06Z Friday]

MVFR cigs will continue to improve to VFR over the next couple hours then remain VFR through the end of the TAF period. Winds from the northwest this morning are already quite breezy, but will be even more blustery after sunrise, near 10-15G22kt. Winds are expected to lighten up again after sunset.

MARINE.

The low pressure system that brought us Wednesday's cold front will continue to sweep eastward through the north Atlantic waters today, with a strong ridge of high pressure building eastward behind it. This will keep strong northerly winds of 15 to 25 knots with gusts to 35 to 40 knots in place through the afternoon, then slacken overnight as that ridge move in. That ridge to our north will keep fair boating conditions in place through Saturday night. Our next cold front will then cross the area Sunday into Sunday night. The region will be between the exiting low to the east northeast and building high to the west northwest Monday into Tuesday.

Rip Currents: Moderate risk of rip currents through Friday at NE FL and SE GA beaches.

FIRE WEATHER.

Strong northwesterly surface and transport winds will overspread our region through the early morning hours, with winds shifting to north-northwesterly by the mid-morning hours. Winds will then shift to northerly this afternoon with gradually decreasing speeds. A colder and much drier air mass will plunge over our area today, with minimum relative humidity values of 35-40 percent this afternoon. The dry air mass will linger on Friday, with inland humidity values falling to 30-35 percent during the afternoon hours. Surface and transport winds will shift to north-northeasterly on Friday, with breezy conditions prevailing at coastal locations and much lighter winds inland. Low daytime dispersion values are forecast for locations west of U.S. Highway 301 on Friday. Surface and transport winds will shift to southeasterly on Saturday, with breezy conditions developing at coastal locations during the afternoon hours.

PRELIMINARY POINT TEMPS/POPS.

AMG 54 31 56 32 62 / 0 0 0 0 0 SSI 54 38 52 38 59 / 0 0 0 0 0 JAX 55 37 57 34 64 / 0 0 0 0 0 SGJ 56 42 56 39 64 / 0 0 0 0 0 GNV 58 35 61 36 67 / 0 0 0 0 0 OCF 60 35 63 38 69 / 0 0 0 0 0

JAX WATCHES/WARNINGS/ADVISORIES. FL . None. GA . None. AM . Gale Warning until 4 PM EST this afternoon 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.

Gale Warning until 1 PM EST this afternoon 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
41112 - Offshore Fernandina Beach, FL (132) 14 mi57 min 58°F 58°F2 ft
SAXG1 - Sapelo Island Reserve, GA 50 mi57 min NW 15 54°F 1018 hPa (+1.0)46°F
41008 - GRAYS REEF - 40 NM Southeast of Savannah, GA 59 mi67 min WNW 23 G 29 57°F 57°F3 ft1016.4 hPa (+0.8)51°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 mi62 minNW 12 G 1910.00 miPartly Cloudy57°F0°F%1018.6 hPa
Jacksonville International Airport, FL17 mi61 minNW 11 G 1710.00 miA Few Clouds56°F52°F87%1018.8 hPa
Mayport Naval Station - Adm David L. McDonald Field, FL24 mi65 minWNW 15 G 2010.00 miFair59°F53°F81%1018.2 hPa

Link to 5 minute data for KFHB

Wind History from FHB (wind in knots)
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Last 24hrSW8S7S7SW7SW6SW8SW9W9SW7W7NE12NE8NE12N5N5NW4SW4W4W6W12
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1 day agoSW6S5S5SW3SW6SW6SW9SW10S12SW12SW10SW8W5SW4S5SW4SW4SW6SW5S5S5S7SW6SW5
2 days agoNW3CalmCalmCalmS8SW7SW9SW9SW10S8
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S7SE7SE8SE7SE5CalmCalmCalm----SW3SW4SW5S6

Tide / Current Tables for St. Marys, St. Marys River, Florida
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St. Marys
Click for Map
Thu -- 02:36 AM EST     -0.08 feet Low Tide
Thu -- 07:19 AM EST     Sunrise
Thu -- 07:25 AM EST     Moonset
Thu -- 09:10 AM EST     6.91 feet High Tide
Thu -- 02:18 PM EST     Full Moon
Thu -- 03:17 PM EST     0.19 feet Low Tide
Thu -- 05:58 PM EST     Moonrise
Thu -- 05:58 PM EST     Sunset
Thu -- 09:28 PM EST     5.90 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.410.100.92.33.95.36.46.96.65.642.410.20.41.42.74.15.25.85.85

Tide / Current Tables for St. Johns River Entrance, Florida Current (3)
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St. Johns River Entrance
Click for Map
Thu -- 12:28 AM EST     -1.98 knots Max Ebb
Thu -- 04:18 AM EST     0.00 knots Slack
Thu -- 07:19 AM EST     Sunrise
Thu -- 07:25 AM EST     Moonset
Thu -- 07:28 AM EST     2.74 knots Max Flood
Thu -- 10:40 AM EST     -0.01 knots Slack
Thu -- 01:15 PM EST     -2.03 knots Max Ebb
Thu -- 02:18 PM EST     Full Moon
Thu -- 05:23 PM EST     0.00 knots Slack
Thu -- 05:58 PM EST     Moonrise
Thu -- 05:58 PM EST     Sunset
Thu -- 07:51 PM EST     2.03 knots Max Flood
Thu -- 10:38 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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-1.9-1.9-1.5-0.9-0.20.61.82.62.620.9-0.5-1.6-2-1.9-1.5-1-0.30.61.721.60.7-0.5

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