National Weather Service National Headquarters

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

000
FZUS52 KMLB 211320
CWFMLB

Coastal Waters Forecast for East Central Florida
National Weather Service Melbourne FL
920 AM EDT Thu Sep 21 2023

Atlantic coastal waters from Flagler Beach to Jupiter Inlet out 60 nm.

Seas are provided as a range of the average height of the highest
one third of the waves, along with the occasional height of the
average highest ten percent of the waves.

AMZ500-212130-
Synopsis for Flagler Beach to Jupiter Inlet out to 60 nm-
920 AM EDT Thu Sep 21 2023

.SYNOPSIS...A stalled frontal boundary will remain over central
Florida and the adjacent Atlantic waters today. Low pressure will
develop along this boundary north of the Bahamas late today into
Friday and then move northward. This will cause freshening
northeast to north winds and building seas, with poor to hazardous
boating conditions developing late this afternoon through
Saturday, especially offshore and over the Gulf Stream. Scattered
to numerous showers and lightning storms are forecast today.
Chances for showers and storms are forecast to decrease over the
local Atlantic waters into the weekend.


.GULF STREAM HAZARDS...Seas building to 6 feet offshore late this
afternoon, and up to 7 feet offshore, north of Sebastian Inlet
tonight.

The approximate location of the west wall of the Gulf Stream
based on the Real Time Ocean Forecast System as of Tuesday,
September 19th.

48 nautical miles east of Ponce Inlet.
35 nautical miles east of Port Canaveral.
26 nautical miles east of Sebastian Inlet.
19 nautical miles east of Fort Pierce Inlet.
11 nautical miles east of Saint Lucie Inlet.



$$

AMZ550-212130-
Flagler Beach to Volusia-Brevard County Line 0-20 nm-
920 AM EDT Thu Sep 21 2023

...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH
LATE FRIDAY NIGHT...

.THIS AFTERNOON...Northeast winds 5 to 10 knots, increasing to
10 to 15 knots in the afternoon. Seas 3 to 4 feet with occasional
seas to 5 feet. A dominant period 13 seconds. A moderate chop on
the intracoastal waters. A chance of showers in the morning. A
chance of thunderstorms. Showers likely in the afternoon.
.TONIGHT...Northeast winds 10 to 15 knots. Seas 4 to 6 feet with
occasional seas to 7 feet. A dominant period 13 seconds. A light
chop on the intracoastal waters. A chance of showers and a slight
chance of thunderstorms.
.FRIDAY...North winds 15 to 20 knots. Seas 5 to 7 feet with
occasional seas to 9 feet. A dominant period 8 seconds. Choppy on
the intracoastal waters. A chance of showers and thunderstorms.
.FRIDAY NIGHT...North winds 15 to 20 knots, diminishing to 10 to
15 knots after midnight. Seas 5 to 7 feet with occasional seas to
9 feet. Choppy on the intracoastal waters. A chance of showers
and thunderstorms.
.SATURDAY...Northwest winds 10 to 15 knots, becoming north in the
afternoon. Seas 5 to 7 feet with occasional seas to 9 feet. A
moderate chop on the intracoastal waters. A slight chance of
showers and thunderstorms.
.SATURDAY NIGHT...Northeast winds 10 knots, becoming north after
midnight. Seas 3 to 5 feet with occasional seas to 6 feet. A
slight chance of showers and thunderstorms.
.SUNDAY...North winds 5 to 10 knots, becoming northeast in the
afternoon. Seas 2 to 3 feet. A chance of showers and
thunderstorms.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. A
chance of showers and thunderstorms.
.MONDAY...Northeast winds 5 to 10 knots. Seas around 2 feet. A
chance of showers and thunderstorms.

Winds and waves higher in and near thunderstorms.

$$

AMZ552-212130-
Volusia-Brevard County Line to Sebastian Inlet 0-20 nm-
920 AM EDT Thu Sep 21 2023

...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY AFTERNOON THROUGH
LATE FRIDAY NIGHT...

.THIS AFTERNOON...Northeast winds 5 to 10 knots, increasing to
10 to 15 knots late. Seas 3 to 5 feet with occasional seas to
6 feet. A dominant period 13 seconds. A moderate chop on the
intracoastal waters. A chance of showers and thunderstorms.
.TONIGHT...North winds 10 to 15 knots. Seas 4 to 6 feet with
occasional seas to 7 feet. A dominant period 13 seconds. A light
chop on the intracoastal waters. A chance of showers and a slight
chance of thunderstorms.
.FRIDAY...North winds 10 to 15 knots. Seas 4 to 6 feet with
occasional seas to 7 feet. A dominant period 12 seconds. A
moderate chop on the intracoastal waters. A chance of showers and
thunderstorms.
.FRIDAY NIGHT...North winds 10 to 15 knots. Seas 5 to 7 feet with
occasional seas to 9 feet. A light chop on the intracoastal
waters. A chance of showers and thunderstorms.
.SATURDAY...North winds 10 knots. Seas 5 to 7 feet with
occasional seas to 9 feet. A light chop on the intracoastal
waters. A slight chance of showers and thunderstorms.
.SATURDAY NIGHT...Northeast winds 5 to 10 knots. Seas 3 to 5 feet
with occasional seas to 6 feet. A chance of thunderstorms and a
slight chance of showers.
.SUNDAY...Northeast winds 5 to 10 knots. Seas 2 to 3 feet. A
chance of showers and thunderstorms.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. A
chance of showers and thunderstorms.
.MONDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. A chance of
showers and thunderstorms.

Winds and waves higher in and near thunderstorms.

$$

AMZ555-212130-
Sebastian Inlet to Jupiter Inlet 0-20 nm-
920 AM EDT Thu Sep 21 2023

.THIS AFTERNOON...North winds 5 to 10 knots, increasing to 10 to
15 knots late. Seas 3 to 4 feet with occasional seas to 5 feet. A
dominant period 13 seconds. A moderate chop on the intracoastal
waters. A chance of showers in the morning. Scattered
thunderstorms. Showers likely in the afternoon.
.TONIGHT...North winds 10 to 15 knots, diminishing to 5 to
10 knots after midnight. Seas 3 to 5 feet with occasional seas to
6 feet. A dominant period 13 seconds. A light chop on the
intracoastal waters. A chance of showers and a slight chance of
thunderstorms.
.FRIDAY...North winds 10 to 15 knots. Seas 4 to 6 feet with
occasional seas to 7 feet. A dominant period 12 seconds. A
moderate chop on the intracoastal waters. A chance of showers and
thunderstorms.
.FRIDAY NIGHT...North winds 10 to 15 knots, diminishing to 5 to
10 knots after midnight. Seas 5 to 7 feet with occasional seas to
9 feet. A light chop on the intracoastal waters. A chance of
showers and thunderstorms.
.SATURDAY...North winds 5 to 10 knots. Seas 5 to 7 feet with
occasional seas to 9 feet. A light chop on the intracoastal
waters. A chance of showers and thunderstorms.
.SATURDAY NIGHT...Northeast winds 5 to 10 knots. Seas 5 to 7 feet
with occasional seas to 9 feet. A chance of showers and
thunderstorms.
.SUNDAY...East winds 5 to 10 knots. Seas 3 to 4 feet with
occasional seas to 5 feet. A chance of showers and thunderstorms.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. A
chance of showers and thunderstorms.
.MONDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Showers
likely and a chance of thunderstorms.

Winds and waves higher in and near thunderstorms.

$$

AMZ570-212130-
Flagler Beach to Volusia-Brevard County Line 20-60 nm-
920 AM EDT Thu Sep 21 2023

...SMALL CRAFT ADVISORY IN EFFECT FROM 8 PM EDT THIS EVENING
THROUGH LATE FRIDAY NIGHT...

.THIS AFTERNOON...Northeast winds 5 to 10 knots, increasing to
10 to 15 knots in the afternoon. Seas 4 to 6 feet with occasional
seas to 7 feet. A dominant period 13 seconds. Showers likely and
scattered thunderstorms.
.TONIGHT...Northeast winds 15 to 20 knots. Seas 5 to 7 feet with
occasional seas to 9 feet. A dominant period 13 seconds. Showers
likely and a chance of thunderstorms.
.FRIDAY...North winds 15 to 20 knots. Seas 7 to 9 feet with
occasional seas to 11 feet. A dominant period 9 seconds. Showers
likely in the morning. A chance of thunderstorms. A chance of
showers in the afternoon.
.FRIDAY NIGHT...North winds 15 to 20 knots, diminishing to 10 to
15 knots after midnight. Seas 8 to 10 feet with occasional seas
to 14 feet. Showers likely in the evening. A chance of
thunderstorms. A chance of showers after midnight.
.SATURDAY...North winds 10 to 15 knots. Seas 8 to 10 feet with
occasional seas to 13 feet. A chance of showers and
thunderstorms.
.SATURDAY NIGHT...Northeast winds 5 to 10 knots. Seas 5 to 7 feet
with occasional seas to 9 feet. A chance of showers and
thunderstorms.
.SUNDAY...North winds 10 knots, becoming northeast in the
afternoon. Seas 3 to 4 feet with occasional seas to 5 feet. A
chance of showers and thunderstorms.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet. A
chance of showers and thunderstorms.
.MONDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. A chance of
showers and thunderstorms.

Winds and seas higher in and near thunderstorms.

$$

AMZ572-212130-
Volusia-Brevard County Line to Sebastian Inlet 20-60 nm-
920 AM EDT Thu Sep 21 2023

...SMALL CRAFT ADVISORY IN EFFECT FROM 8 PM EDT THIS EVENING
THROUGH LATE FRIDAY NIGHT...

.THIS AFTERNOON...Northeast winds 10 to 15 knots. Seas 4 to
6 feet with occasional seas to 7 feet. A dominant period
13 seconds. Showers likely and a chance of thunderstorms.
.TONIGHT...North winds 10 to 15 knots. Seas 5 to 7 feet with
occasional seas to 9 feet. A dominant period 13 seconds. Showers
likely and a chance of thunderstorms.
.FRIDAY...North winds 15 to 20 knots. Seas 7 to 9 feet with
occasional seas to 11 feet. A dominant period 8 seconds. Showers
and thunderstorms likely.
.FRIDAY NIGHT...North winds 15 to 20 knots, diminishing to 10 to
15 knots after midnight. Seas 8 to 10 feet with occasional seas
to 13 feet. Showers and thunderstorms likely in the evening, then
a chance of showers and thunderstorms after midnight.
.SATURDAY...North winds 10 to 15 knots. Seas 8 to 10 feet with
occasional seas to 13 feet. A chance of showers and
thunderstorms.
.SATURDAY NIGHT...Northeast winds 10 knots. Seas 5 to 7 feet with
occasional seas to 9 feet. A chance of showers and thunderstorms.
.SUNDAY...Northeast winds 10 knots. Seas 3 to 4 feet with
occasional seas to 5 feet. A chance of showers and thunderstorms.
.SUNDAY NIGHT...East winds 5 to 10 knots. Seas 2 to 3 feet.
Showers likely and a chance of thunderstorms.
.MONDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Showers
likely and a chance of thunderstorms.

Winds and seas higher in and near thunderstorms.

$$

AMZ575-212130-
Sebastian Inlet to Jupiter Inlet 20-60 nm-
920 AM EDT Thu Sep 21 2023

...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH
LATE FRIDAY NIGHT...

.THIS AFTERNOON...North winds 5 to 10 knots. Seas 3 to 5 feet
with occasional seas to 6 feet. A dominant period 13 seconds.
Showers likely and scattered thunderstorms.
.TONIGHT...North winds 10 to 15 knots, diminishing to 5 to
10 knots after midnight. Seas 4 to 6 feet with occasional seas to
7 feet. A dominant period 13 seconds. Showers likely and a chance
of thunderstorms.
.FRIDAY...North winds 10 to 15 knots. Seas 5 to 7 feet with
occasional seas to 9 feet. A dominant period 12 seconds. Showers
and thunderstorms likely.
.FRIDAY NIGHT...North winds 10 to 15 knots. Seas 7 to 9 feet with
occasional seas to 11 feet. Showers and thunderstorms likely in
the evening, then a chance of showers and thunderstorms after
midnight.
.SATURDAY...North winds 10 knots. Seas 7 to 9 feet with
occasional seas to 11 feet. A chance of showers and
thunderstorms.
.SATURDAY NIGHT...Northeast winds 5 to 10 knots. Seas 5 to 7 feet
with occasional seas to 9 feet. A chance of showers and
thunderstorms.
.SUNDAY...East winds 5 to 10 knots. Seas 3 to 4 feet with
occasional seas to 5 feet. Showers likely and a chance of
thunderstorms.
.SUNDAY NIGHT...East winds 10 knots. Seas 2 to 3 feet. Showers
likely and a chance of thunderstorms.
.MONDAY...East winds 5 to 10 knots. Seas 2 to 3 feet. Showers
likely and a chance of thunderstorms.

Winds and seas higher in and near thunderstorms.

$$