Marine Weather Net

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


TONIGHT

NE
WINDS
5 - 10
KNOTS

TUESDAY

N
WINDS
10 - 15
KNOTS

TUESDAY NIGHT

NE
WINDS
5 - 10
KNOTS

WEDNESDAY

NE
WINDS
10 - 15
KNOTS

The Marine Weather Forecast In Detail:
AMZ452 Forecast Issued: 201 PM EST Mon Feb 17 2025

Tonight...Northeast Winds 5 To 10 Knots. Seas 2 To 4 Feet, Occasionally To 5 Feet. Wave Detail: Northeast 4 Feet At 7 Seconds. Intracoastal Waters Light Chop.
Tuesday...North Winds 10 To 15 Knots. Seas 2 To 3 Feet. Wave Detail: Northeast 3 Feet At 8 Seconds. Intracoastal Waters A Moderate Chop.
Tuesday Night...Northeast Winds 5 To 10 Knots. Seas Around 3 Feet. Wave Detail: Northeast 3 Feet At 7 Seconds. Intracoastal Waters Light Chop. A Chance Of Showers After Midnight.
Wednesday...Northeast Winds 10 To 15 Knots, Becoming North In The Afternoon. Seas 3 To 4 Feet, Occasionally To 5 Feet. Wave Detail: East 4 Feet At 8 Seconds And Northwest 2 Feet At 3 Seconds. Intracoastal Waters A Moderate Chop. Showers.
Wednesday Night...North Winds 15 To 20 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: North 3 Feet At 4 Seconds And East 3 Feet At 7 Seconds. Intracoastal Waters Choppy. A Chance Of Showers In The Evening.
Thursday And Thursday Night...North Winds 15 To 20 Knots. Seas 3 To 5 Feet, Occasionally To 6 Feet. Wave Detail: Northeast 4 Feet At 7 Seconds And North 3 Feet At 4 Seconds. Intracoastal Waters Choppy.
Friday...Northeast Winds 15 To 20 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. Intracoastal Waters Choppy.
Saturday...Northeast Winds 10 To 15 Knots, Diminishing To 5 To 10 Knots. Seas 3 To 4 Feet, Occasionally To 5 Feet. Intracoastal Waters A Moderate Chop. A Slight Chance Of Showers Through The Night.
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Area Forecast Discussion
National Weather Service Jacksonville FL
635pm EST Monday Feb 17 2025

.SHORT TERM... (Tuesday through Wednesday night) Issued at 217pm EST Monday Feb 17 2025

Cooler and stable conditions are expected as winds turn onshore under the influence of an expansive ridge extending from Canada. Onshore flow will warm temperatures through Wednesday as the stalled front begins to lift northward into the area. As it does so, a lead disturbance aloft will organize a Gulf low which will track across NE FL, riding along the frontal edge, Wednesday afternoon. This will bring a widespread rain to the region with forecast amounts in the 1- 3" range. Given the predicted location of the warm front, the heaviest rainfall appears to focus along the I-10 corridor. There will be a chance for locally heavier amounts which may lead to localized flooding, particularly in flood prone areas Wednesday afternoon. A trailing cold front will slide southeastward behind the low as it exits to northeast Thursday evening and begin to funnel a cold airmass into the region with lows dipping back int he 30s in SE GA and to the low/mid 40s in NE FL.

Long Term
(Thursday through next Monday) Issued at 217pm EST Monday Feb 17 2025

An arctic airmass will roll in behind the aforementioned cold front on a northwesterly flow. With the cold, dry and sunny conditions will prevail as the strong ridge behind the front will gradually weaken as it builds from the central US to the Atlantic coast through Friday night. After a couple mornings of freezing temperatures and frost Friday and Saturday, a temperature rebound will occur as the high shifts further east and an onshore flow modifies the airmass.

The forecast this weekend is uncertain as two features: (1) the position of a lifting warm front and (2) the depth and phasing of passing shortwaves in the northern streams. Because of the diversity amid the guidance, have best rainfall chances sitting around 20-40%. This appears to be stable (overrunning) rain set up at the moment but if the front lifts more quickly to the north slight thunder chances may need to be mentioned. Temperatures will cruise back toward normal this weekend.

Marine
Issued at 217pm EST Monday Feb 17 2025

Small craft advisory headlines have come to an end for the off shore waters. High pressure will continue to build to the north of the local waters this evening through Tuesday with weak onshore flow with no headlines expected. South winds increase for Wednesday as a fast moving Gulf low pressure system tracks into the local waters. There are still some potential for small craft advisory headlines before the low pressure pulls away Wednesday night as winds quickly back to the Northwest, with conditions close to small craft advisory levels into Thursday. High pressure builds north of the region Friday with another shift back to Northeast winds in the local waters, but still a question on how strong these winds will be.

Rip Currents
Moderate Risk of Rip currents at all area beaches for the next few days.

Fire Weather
Issued at 225am EST Monday Feb 17 2025

Breezy northwesterly flow will start the day today post cold front, though will start to quickly ease by late this afternoon and evening as high pressure broadens. The dry flow will drop minimum RH values into the upper 20s to low 30s percent for most of the region in addition to surface winds around 10 mph, close to elevated fire danger levels. Dispersions will peak only in the fair range late morning to early afternoon as the flow weakens both near the surface and aloft. More of an onshore flow will bump up RH values on Tuesday, though light enough to result in only fair dispersion at best. Low pressure approaches and moves across the region Tuesday Night and Wednesday, bringing widespread beneficial rain to the region. Cool and dry conditions return in its wake to end the week.

NOAA Jacksonville FL Office: Watches - Warnings - Advisories
FL...Frost Advisory from 2am to 8am EST Tuesday for FLZ021-023-024- 030-035-120-220-322-422-425-522.

GA...Frost Advisory from 2am to 8am EST Tuesday for GAZ136-152-153- 162-163-165-264-350-364.

Freeze Warning from 2am to 8am EST Tuesday for GAZ132>135-149- 151-250.

AM...None.