Marine Weather Net

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


THIS AFTERNOON

SE
WINDS
5 - 10
KNOTS

TONIGHT

E
WINDS
5 - 10
KNOTS

MONDAY

NE
WINDS
5 - 10
KNOTS

MONDAY NIGHT

E
WINDS
5 - 10
KNOTS

The Marine Weather Forecast In Detail:
AMZ472 Forecast Issued: 1123 AM EDT Sun Oct 25 2020

SMALL CRAFT SHOULD EXERCISE CAUTION
This Afternoon...Southeast Winds 5 To 10 Knots Becoming East In The Afternoon. Seas 5 To 6 Feet With A Dominant Period 12 Seconds. Slight Chance Of Showers.
Tonight...East Winds 5 To 10 Knots Becoming Northeast After Midnight. Seas 4 To 6 Feet With A Dominant Period 12 Seconds.
Monday...Northeast Winds 5 To 10 Knots. Seas 3 To 5 Feet With A Dominant Period 11 Seconds.
Monday Night...East Winds 5 To 10 Knots. Seas 3 To 5 Feet.
Tuesday...East Winds 5 To 10 Knots. Seas 3 To 4 Feet. Slight Chance Of Showers And Thunderstorms In The Afternoon.
Tuesday Night...Southeast Winds 10 Knots. Seas 3 To 4 Feet. Slight Chance Of Showers And Thunderstorms.
Wednesday...Southeast Winds 10 To 15 Knots. Seas 3 To 4 Feet. Chance Of Showers And Slight Chance Of Thunderstorms.
Wednesday Night...South Winds 10 To 15 Knots. Seas 3 To 5 Feet. Slight Chance Of Showers And Thunderstorms.
Thursday...South Winds 10 To 15 Knots. Seas 4 To 5 Feet. Slight Chance Of Showers And Thunderstorms.
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AMZ400: Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm
1123 AM EDT Sun Oct 25 2020

High pressure remains generally north of the local waters into early next week providing light east to southeast winds into early next week. Winds will become more southerly Wednesday and Thursday ahead of an approaching cold front.

Gulf Stream
The approximate location of the west wall of the Gulf Stream as of Oct 24, 2020 at 1200 UTC...
- 56 nautical miles east of Flagler Beach.
- 56 nautical miles east northeast of Saint Augustine Beach.
- 58 nautical miles east of Jacksonville Beach.
- 77 nautical miles east southeast of St Simons Island.
Area Forecast Discussion
National Weather Service Jacksonville FL
147pm EDT Sunday Oct 25 2020

Near Term - Through Tonight
Today...Mid level shortwave/disturbance continues to push NE through coastal SE GA early this morning and will exit into the Carolinas after sunrise. In the wake of this feature already have patchy dense fog developing over inland NE FL/inland SE GA and will need to monitor for possible localized dense fog advisory towards sunrise as clearing skies aloft will help aid in fog formation. Otherwise drying atmosphere and weak surface pressure gradient across the region will lead to low rainfall chances in diurnal heating this afternoon. Max Temps will continue above normal and reach into the mid/upper 80s inland and lower 80s at the beaches and this will lead to a weak East Coast sea breeze pushing inland but still only expect widely scattered showers along this feature during the afternoon hours as the drying airmass aloft and the weak subsidence in the wake of departing should limit convection.

Tonight...Weak pressure gradient and mostly clear skies during the evening hours should lead to enough cooling of the boundary layer and this combined with moist low levels/light NE flow should lead to dense fog formation after midnight with widespread <= 1/4 mile visibilities and dense fog advisories appear likely area-wide as temps fall into the mid/upper 60s inland and lower 70s along the coast.

.SHORT TERM [Monday Through Tuesday]... An upper ridge continues to build eastward across the region while Tropical Storm Zeta moves north-northwestward into the Gulf around the southern periphery of the ridge. With dry mid to upper level air in place, Monday will be mainly dry with an isolated shower possible in north-central Florida. On Tuesday, developing southerly flow will begin to lift deep tropical moisture into the region increasing chances for rain to the area. Temperatures will be above climo with highs in the 80s and lows in the upper 60s to low 70s.

.LONG TERM [Wednesday Through Saturday]... On Wednesday, a cut off low will move through the Southern Plains and likely sweep up Zeta, merging it into our next cold front moving through the Deep South. Ridging over the region shifts eastward developing deep southerly flow over the area continuing to lift moisture into the area increasing rain chances ahead of the cold front. The cold front pushes through the area on Friday filtering cooler, drier air in for the weekend. Highs will continue to be above normal through Thursday night, peaking in the mid-upper 80s, dipping to the upper 60s-low 70s overnight. Behind the front, we may see daytime temperatures back in the 70s and overnight lows back in the mid 50s-low 60s across inland portions of the area.

Marine
Long period swells from distant TC Epsilon continue to slowly subside today but lingering 5-7 ft seas offshore this morning will continue SCA (Small Craft Advisory) with this package, while combined seas mainly 3-5 ft for the nearshore waters. With High pressure lingering north of the waters Mon/Tuesday expect onshore NE to E winds around 10 knots with combined seas falling to 2-4 ft, then as High pressure pushes offshore in advance of approaching cold front winds become southerly Wed/Thu and increase to 10-15 knots with seas 3-5 ft.

Rip Currents
High risk continues along the NE FL coast with rough surf/breakers lingering in the 3-6 ft range, while lower surf/breakers of 2-4 ft along the SE GA coast supports solid Moderate risk. Moderate risk expected for both NE FL/SE GA beaches on Monday.

NOAA Jacksonville FL Office: Watches - Warnings - Advisories
FL...High Rip Current Risk through late tonight for Coastal Duval- Coastal Flagler-Coastal Nassau-Coastal St. Johns.

GA...None. AM...None.