Marine Weather Net

Fernandina Beach to St. Augustine, FL 20 - 60 NM Marine Forecast


TONIGHT

N
WINDS
5 KNOTS

WEDNESDAY

NW
WINDS
10 - 15
KNOTS

WEDNESDAY NIGHT

NW
WINDS
5 - 10
KNOTS

THURSDAY

W
WINDS
10 - 15
KNOTS

The Marine Weather Forecast In Detail:
AMZ472 Forecast Issued: 218 PM EST Tue Jan 19 2021

Tonight...North Winds 5 Knots Becoming West 5 To 10 Knots In The Late Evening And Early Morning, Then Increasing To 10 To 15 Knots Towards Daybreak. Seas 2 To 3 Feet With A Dominant Period 9 Seconds.
Wednesday...Northwest Winds 10 To 15 Knots. Seas 2 To 3 Feet With A Dominant Period 4 Seconds.
Wednesday Night...Northwest Winds 5 To 10 Knots. Seas 2 To 3 Feet With A Dominant Period 9 Seconds.
Thursday...West Winds 10 To 15 Knots. Seas 2 To 3 Feet.
Thursday Night...West Winds 15 To 20 Knots. Seas 3 To 4 Feet. Chance Of Showers After Midnight.
Friday...West Winds 10 To 15 Knots. Seas 3 To 4 Feet. Chance Of Showers.
Friday Night...West Winds 10 To 15 Knots Becoming Northwest After Midnight. Seas 3 To 4 Feet. Chance Of Showers.
Saturday...North Winds 10 To 15 Knots. Seas 3 To 5 Feet. Slight Chance Of Showers.
Saturday Night...Northeast Winds 10 To 15 Knots. Seas 4 To 5 Feet. Slight Chance Of Showers.
Sunday...East Winds 10 To 15 Knots. Seas 3 To 5 Feet. Slight Chance Of Showers.
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AMZ400: Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm
218 PM EST Tue Jan 19 2021

High pressure will build northwest of the region through Wednesday, as a series of weak cold fronts move southeast across area. The high will build overhead Wednesday night, then toward the south Thursday through Friday. A warm front will stretch east across the southern US Thursday. This boundary will sink into SE GA Thursday night into Friday. An area of low pressure move east along this boundary Friday into Friday night, with a cold front crossing area Friday night. High pressure will build to the north northeast Saturday, as an inverted trough develops along the coast. The high will build to the east Sunday, then southeast Monday.

Gulf Stream
The approximate location of the west wall of the Gulf Stream as of Jan 16, 2021 at 1200 UTC...
- 58 nautical miles east of Flagler Beach.
- 63 nautical miles east of Saint Augustine Beach.
- 71 nautical miles east of Jacksonville Beach.
- 92 nautical miles east southeast of St Simons Island.
Area Forecast Discussion
National Weather Service Jacksonville FL
238pm EST Tuesday Jan 19 2021

Near Term
/through Wednesday/... High pressure overhead this afternoon will move toward the west northwest Tonight, as a few weak cold fronts move southeast across region Tonight into Wednesday. Little moisture with these features, so precipitation is not expected, although more clouds than Today are expected.

A milder night is expected Tonight, with lows ranging from the upper 30s over the Suwannee valley to the lower to mid 40s elsewhere. Highs Wednesday will reach above average readings in the mid to upper 60s over SE GA, and upper 60s to lower 70s for NE FL.

Short Term
/Wednesday night through Saturday/... High pressure will build overhead Wednesday night, then to the south Thursday into Friday. A warm front will extend east across the southern US into central GA late Thursday. This boundary will sink south into SE GA Thursday night through Friday, increasing coverage of showers.

Main area of low pressure will move east along the frontal boundary Friday afternoon and evening, with its associated cold front moving south across NE FL Friday night into Saturday morning. As the low moves through, precipitation chances are expected to increase. Best moisture will move to the east of the area Friday night with the low, leaving more limited moisture and lower precipitation chances as the cold front moves through NE FL.

The front will stall and dissipate just to the south during the day Saturday, as high pressure builds to the north northeast. An inverted coastal trough is expected to develop in the onshore flow created by the high Saturday, which will produce the potential for a few coastal showers.

Temperatures Wednesday night into Thursday will average near to a little above normal, with readings well above normal for Thursday night.

A fairly wide range in temperatures expected for Friday into Friday night, due to the position of the frontal boundary. With the front just to the south Saturday, an even greater temperature gradient anticipated, which could be as much as 15 degrees. While much of the area will experience below normal highs, areas south of a line from GNV to SGJ will be above normal.

Long Term
/Saturday night through Tuesday/... Inverted trough will continue through Saturday night into Sunday, with the potential for coastal showers. As the high pressure builds more to the east on Sunday night, the coastal trough will dissipate, yielding an increasingly warm southerly flow. The high will build more toward the southeast Sunday night through Monday, keeping the warm southerly flow going.

The high will sink further to the southeast Monday night into Tuesday, allowing a cold front to approach the area from the northwest Monday night, then move into area Tuesday. Models are depicting this system to be a dissipating front as it moves through, with lower end precipitation chances.

Due to onshore flow Saturday night and Sunday night low will trend above normal, while Sunday highs trend closer to average. Warm advection is expected to keep readings above normal Monday into Tuesday.

Marine
High pressure will build northwest of the region through Wednesday, as a series of weak cold fronts move southeast across area. The high will build overhead Wednesday night, then toward the south Thursday through Friday. A warm front will stretch east across the southern US Thursday. This boundary will sink into SE GA Thursday night into Friday. An area of low pressure move east along this boundary Friday into Friday night, with a cold front crossing area Friday night. High pressure will build to the north northeast Saturday, as an inverted trough develops along the coast. The high will build to the east Sunday, then southeast Monday.

Rip Currents
SE GA Low through Wednesday NE FL Low through Wednesday

NOAA Jacksonville FL Office: Watches - Warnings - Advisories
FL...None. GA...None. AM...None.