AMZ400-140145-
Synopsis for Altamaha Sound GA to Flagler Beach FL out to 60 nm-
543 AM EST Sat Dec 13 2025
.SYNOPSIS...
High pressure centered over our local waters this morning will
shift eastward this afternoon ahead of an Arctic cold front that
will enter the southeastern states tonight. This strong cold front
will cross our area from the northwest on Sunday, with only a few
showers possible on Sunday night and Monday morning, mainly
offshore. North-northwesterly winds will strengthen in the wake
of this frontal passage on Sunday afternoon and will shift to
north northeasterly on Sunday night. Small Craft Advisories will
likely be issued for Sunday afternoon, with Gale Warnings also
likely throughout our local waters on Sunday Night and Monday
morning as winds shift to northeasterly as Arctic high pressure
wedges down the southeastern seaboard. This high pressure center
will gradually weaken over the southeastern states early next
week as coastal troughing develops over our local waters. Onshore
winds and seas will then gradually subside from Monday afternoon
through Tuesday. Coastal troughing may generate a few showers
early next week, mainly offshore. High pressure will then shift
eastward and off the southeastern seaboard by midweek, with a
weaker frontal boundary likely approaching our local waters late
next week.
.GULF STREAM...
The approximate location of the west wall of the Gulf Stream as of
Dec 06, 2025 at 1200 UTC...
71 nautical miles east of Flagler Beach.
74 nautical miles east of Saint Augustine Beach.
85 nautical miles east southeast of Jacksonville Beach.
97 nautical miles east southeast of St Simons Island.
This data courtesy of the Naval Oceanographic Office.
$$
AMZ450-452-454-140145-
Coastal waters from Altamaha Sound to Fernandina Beach FL out
20 NM-
Coastal waters from Fernandina Beach to St. Augustine FL out
20 NM-
Coastal waters from St. Augustine to Flagler Beach FL out 20 NM-
543 AM EST Sat Dec 13 2025
TODAY
West northwest winds around 5 knots, becoming east
southeast 5 to 10 knots this afternoon. Seas 1 to 2 feet.
Intracoastal waters mostly smooth.
TONIGHT
South winds around 5 knots, becoming west 5 to 10 knots
after midnight. Seas 1 to 2 feet. Intracoastal waters mostly
smooth.
SUNDAY
West northwest winds around 10 knots, becoming
north northwest and increasing to 20 to 25 knots in the
afternoon. Seas 2 to 4 feet, occasionally to 5 feet. Wave Detail:
Northwest 3 feet at 4 seconds. Intracoastal waters becoming rough.
SUNDAY NIGHT
North winds 25 to 30 knots, becoming north
northeast after midnight. Frequent gusts to Gale Force likely.
Seas 5 to 7 feet, occasionally to 9 feet, building to 6 to 9 feet,
occasionally to 11 feet after midnight. Wave Detail:
Northeast 7 feet at 7 seconds, becoming north 9 feet at 7 seconds.
Intracoastal waters very rough.
MONDAY
Northeast winds 25 to 30 knots, diminishing to around
20 knots in the afternoon. Frequent gusts to Gale Force possible
during the early morning. Seas 6 to 9 feet, occasionally to 11
feet. Wave Detail: Northeast 9 feet at 8 seconds. Intracoastal
waters rough.
MONDAY NIGHT
Northeast winds 15 to 20 knots, becoming north 10
to 15 knots after midnight. Seas 5 to 7 feet, occasionally to 9
feet. Wave Detail: Northeast 7 feet at 9 seconds. Intracoastal
waters becoming a light chop.
TUESDAY
North winds 10 to 15 knots. Seas 3 to 5 feet,
occasionally to 6 feet. Intracoastal waters a light chop.
TUESDAY NIGHT AND WEDNESDAY
Northeast winds 5 to 10 knots.
Seas 2 to 3 feet. Intracoastal waters mostly smooth.
$$
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