Marine Weather, NWS WFO Duluth, MN

Nearshore Forecast

800
FZUS53 KDLH 212012
NSHDLH

Nearshore Marine Forecast
National Weather Service Duluth MN
212 PM CST Fri Feb 21 2025

For waters within five nautical miles of shore on Lake Superior.

Waves are the significant wave height - the average of the highest
1/3 of the wave spectrum. Occasional wave height is the average of
the highest 1/10 of the wave spectrum.

LSZ140-141-220515-
Grand Portage to Grand Marais MN-
Grand Marais to Taconite Harbor MN-
212 PM CST Fri Feb 21 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.TONIGHT...Southwest wind 20 to 25 knots with gusts to around
30 knots becoming west 10 to 15 knots with gusts to around
25 knots after midnight. Freezing spray in the evening. Chance of
flurries late in the night. Waves 5 to 8 feet subsiding to 2 to
4 feet late in the night. Waves occasionally to 10 feet.
.SATURDAY...Southwest wind 10 to 15 knots. Gusts up to 20 knots
early in the morning then 20 knots in the afternoon. Chance of
snow showers in the morning, then chance of flurries in the
afternoon. Waves 1 to 3 feet building to 2 to 4 feet in the
afternoon.
.SATURDAY NIGHT...West wind 5 to 10 knots becoming northeast
early in the morning. Mostly cloudy. Waves 1 to 3 feet.
.SUNDAY...East wind 5 to 10 knots becoming south 10 to 15 knots
with gusts to around 20 knots in the late morning and afternoon.
Slight chance of snow in the afternoon. Waves 1 foot or less.

Note...Wave height forecasts are for ice free areas.

$$

LSZ142-143-220515-
Taconite Harbor to Silver Bay Harbor MN-
Silver Bay Harbor to Two Harbors MN-
212 PM CST Fri Feb 21 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.TONIGHT...Southwest wind 20 to 25 knots with gusts to around
30 knots easing to 10 to 15 knots with gusts to around 25 knots
after midnight. Chance of flurries late in the night. Waves 3 to
5 feet subsiding to 1 to 2 feet late in the night. Waves
occasionally to 7 feet.
.SATURDAY...Southwest wind 10 to 15 knots. Gusts up to 20 knots
in the late morning and afternoon. Chance of flurries in the
morning. Waves 1 to 2 feet building to 1 to 3 feet in the
afternoon.
.SATURDAY NIGHT...West wind 5 to 10 knots. Mostly cloudy. Waves
1 to 2 feet.
.SUNDAY...Southwest wind 5 to 10 knots. Gusts up to 20 knots late
in the afternoon. Slight chance of snow and light freezing rain
in the afternoon. Waves 1 foot or less.

Note...Wave height forecasts are for ice free areas.

$$

LSZ144-145-220515-
Two Harbors to Duluth MN-Duluth MN to Port Wing WI-
212 PM CST Fri Feb 21 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.TONIGHT...Southwest wind 15 to 20 knots. Gusts up to 30 knots
decreasing to 20 knots. Partly cloudy early in the evening then
becoming mostly cloudy. Waves 2 to 4 feet subsiding to 1 to
3 feet after midnight.
.SATURDAY...Southwest wind 10 to 15 knots with gusts to around
20 knots. Partly sunny. Waves 1 to 2 feet.
.SATURDAY NIGHT...Southwest wind 10 to 15 knots with gusts to
around 20 knots easing to 5 knots early in the morning. Partly
cloudy in the evening then becoming mostly cloudy. Waves 1 to
2 feet.
.SUNDAY...Southwest wind 10 to 15 knots with gusts to around
20 knots. Slight chance of rain, light freezing rain and snow in
the afternoon. Waves 1 foot or less.

Note...Wave height forecasts are for ice free areas.

$$

LSZ146-220515-
Port Wing to Sand Island WI-
212 PM CST Fri Feb 21 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.TONIGHT...Southwest wind 15 to 20 knots. Gusts up to 30 knots
decreasing to 20 knots. Partly cloudy in the evening then
becoming mostly cloudy. Waves 3 to 5 feet. Waves occasionally to
7 feet.
.SATURDAY...Southwest wind 10 to 15 knots with gusts to around
20 knots. Partly sunny. Waves 1 to 3 feet.
.SATURDAY NIGHT...Southwest wind 10 to 15 knots with gusts to
around 20 knots easing to 5 knots early in the morning. Mostly
cloudy. Waves 1 to 3 feet subsiding to 1 to 2 feet in the late
evening and overnight.
.SUNDAY...Southwest wind 5 to 10 knots. Slight chance of snow and
rain in the afternoon. Waves 1 foot or less.

Note...Wave height forecasts are for ice free areas.

$$

LSZ150-220515-
Outer Apostle Islands Beyond 5 NM from Mainland-
212 PM CST Fri Feb 21 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.TONIGHT...Southwest wind 20 to 25 knots. Gusts up to 30 knots
decreasing to 25 knots late in the night. Freezing spray late in
the evening. Chance of flurries late in the night. Waves 4 to
6 feet. Waves occasionally to 8 feet.
.SATURDAY...Southwest wind 15 to 20 knots. Chance of flurries in
the morning. Waves 2 to 4 feet.
.SATURDAY NIGHT...Southwest wind 10 to 15 knots. Gusts up to
20 knots early in the evening. Mostly cloudy. Waves 1 to 3 feet.
.SUNDAY...Southwest wind 5 to 10 knots. Slight chance of rain,
light freezing rain and snow in the afternoon. Waves 1 foot or
less.

Note...Wave height forecasts are for ice free areas.

$$

LSZ148-220515-
Oak Point to Saxon Harbor WI-
212 PM CST Fri Feb 21 2025

...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT...

.TONIGHT...Southwest wind 10 to 15 knots. Gusts up to 25 knots
decreasing to 20 knots after midnight. Partly cloudy in the
evening then becoming mostly cloudy. Waves 1 foot or less.
.SATURDAY...Southwest wind 10 knots rising to 10 to 15 knots in
the late morning and early afternoon, then easing to 10 knots
late in the afternoon. Gusts up to 20 knots. Partly sunny. Waves
1 foot or less.
.SATURDAY NIGHT...Southwest wind 5 to 10 knots. Mostly cloudy.
Waves 1 foot or less.
.SUNDAY...Southwest wind 5 to 10 knots. Slight chance of rain and
snow in the afternoon. Waves 1 foot or less.

Note...Wave height forecasts are for ice free areas.

$$

Graphical marine forecasts are available online at:
weather.gov/greatlakes

Britt

Open Waters Forecast

991
FZUS63 KMQT 212057
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
357 PM EST Fri Feb 21 2025

For waters beyond 5 nautical miles of shore on Lake Superior.

Waves are the significant wave height - the average of the
highest 1/3 of the wave spectrum. Occasional wave height is the
average of the highest 1/10 of the wave spectrum.

.SYNOPSIS... High pressure of 30.6 inches sprawled out over the
Mississippi River Valley is currently extending a 30.4 inch ridge
into the Great Lakes. The high and ridge will shift east tonight,
and by Saturday morning, the high will be located over the
southeast U.S. at a pressure of 30.6 inches. Meanwhile, a 29.8
inch low pressure trough will sweep east, reaching northern
Ontario tonight and Saturday. At a pressure of 30.0 inches, the
tail end of this trough will drift south over Lake Superior during
Saturday night. The trough will then quickly lift north on Sunday
as 29.2 inch low pressure moves out over the Prairie Provinces.
The low will then track east, reaching northern Ontario by Monday
morning and northern Quebec during Monday night. One associated
trough at 29.4 inches will cross Lake Superior early Monday
followed by a second at 29.6 inches early on Tuesday. In its wake,
a weak 29.9 inch high pressure ridge will reach Lake Superior
Tuesday evening.

LSZ162-220500-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
357 PM EST Fri Feb 21 2025 /257 PM CST Fri Feb 21 2025/

.LATE THIS AFTERNOON...Southwest winds to 30 knots with a few
gale force gusts to 35 knots possible. Freezing spray. Waves 3 to
6 feet occasionally to 8 feet building to 4 to 7 feet
occasionally to 9 feet.
.TONIGHT...Southwest winds to 30 knots with a few gale force
gusts to 35 knots possible becoming west 20 to 30 knots by
midnight, then diminishing to 15 to 25 knots late. Freezing
spray. Waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by late morning, then diminishing to 10 to 20 knots by
mid afternoon. A slight chance of snow showers in the morning.
Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots by midnight, then backing southwest late. Waves
subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots in the afternoon. A slight chance of snow showers,
possibly mixed with rain and freezing rain in the afternoon.
Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of rain showers, possibly
mixed with snow. Waves building to 1 to 3 feet.
.MONDAY...West winds 15 to 25 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots veering northwest after
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots backing southwest. Waves
calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves calm to
2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-220500-
Lake Superior from Saxon Harbor WI to Upper Entrance to Portage
Canal MI 5NM off shore to the US/Canadian border including Isle
Royale National Park-
357 PM EST Fri Feb 21 2025

...GALE WARNING IN EFFECT FROM 7 PM THIS EVENING TO 1 AM EST
SATURDAY...

.LATE THIS AFTERNOON...Southwest winds 20 to 30 knots. Waves 4 to
7 feet occasionally to 9 feet.
.TONIGHT...Southwest gales to 35 knots veering west by midnight,
then diminishing to 20 to 30 knots late. Freezing spray. Waves
building to 8 to 11 feet occasionally to 14 feet, then subsiding
to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A slight chance of snow showers. Waves
subsiding to 2 to 4 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing southwest
late. A slight chance of snow showers in the evening. Waves
subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. A slight chance of snow
showers in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of rain showers, possibly
mixed with snow. Waves building to 3 to 5 feet occasionally to
7 feet.
.MONDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots
in the afternoon. Waves subsiding to 2 to 4 feet.
.MONDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots veering north. Waves
building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-220500-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
357 PM EST Fri Feb 21 2025

...GALE WARNING IN EFFECT FROM 7 PM THIS EVENING TO 1 AM EST
SATURDAY...

.LATE THIS AFTERNOON...Southwest winds 20 to 30 knots. Waves 4 to
7 feet occasionally to 9 feet.
.TONIGHT...Southwest gales to 35 knots veering west by midnight,
then diminishing to 20 to 30 knots late. A slight chance of snow
showers. Freezing spray after midnight. Waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering north by
midnight, then veering northeast late. A slight chance of snow
showers in the evening. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. A chance of rain and snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet.
.MONDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots
in the afternoon. Waves subsiding to 2 to 4 feet.
.MONDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots veering north. Waves
building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-220500-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
357 PM EST Fri Feb 21 2025

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...Southwest winds 15 to 25 knots. Waves building to 1 to
3 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 5 to
15 knots. A slight chance of snow showers. Waves subsiding to
calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots veering west by
midnight. A slight chance of snow showers in the evening. Waves
calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. A chance of freezing rain in the
evening. A chance of snow showers. A chance of rain showers after
midnight. Waves calm to 2 feet.
.MONDAY...West winds 15 to 25 knots. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots veering northwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots veering north. Waves
building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-220500-
Lake Superior East of a line from Manitou Island to Marquette MI
and West of a line from Grand Marais MI to the US/Canadian Border
Beyond 5NM from shore-
357 PM EST Fri Feb 21 2025

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TONIGHT...Southwest winds 20 to 30 knots veering west by
midnight, then diminishing to 15 to 25 knots late. Freezing spray
after midnight. A slight chance of snow showers after midnight.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Freezing spray in the morning. A chance of snow
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. A chance of snow
showers. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of snow showers in the evening, then
snow showers, possibly mixed with rain after midnight. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.MONDAY...West winds 15 to 25 knots. A chance of rain showers,
possibly mixed with snow in the morning. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.MONDAY NIGHT...West winds 10 to 20 knots veering northwest after
midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots backing southwest.
Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots veering north. Waves
building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-220500-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
357 PM EST Fri Feb 21 2025

.LATE THIS AFTERNOON...South winds 15 to 25 knots. Waves 1 to
3 feet building to 2 to 4 feet.
.TONIGHT...Southwest winds 15 to 25 knots. Freezing spray after
midnight. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southwest winds 15 to 25 knots veering west by late
morning, then diminishing to 10 to 20 knots by mid afternoon.
Freezing spray in the morning. A chance of snow showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots becoming south
5 to 15 knots late. A chance of snow showers. Waves subsiding to
calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots. A chance of snow
showers in the evening, then snow showers, possibly mixed with
rain after midnight. Waves building to 3 to 5 feet occasionally
to 7 feet, then subsiding to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots veering west in the
afternoon. A chance of snow showers in the morning. A chance of
rain showers. Waves 2 to 4 feet.
.MONDAY NIGHT...West winds 10 to 20 knots veering northwest after
midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots backing southwest.
Waves calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots backing north. A chance
of rain showers. A chance of snow showers. Waves building to 1 to
3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-220500-
MAFOR 2122/
Superior West...GALE WARNING IN EFFECT...11540 11551 11651 11641
11640 11630 12520. Waves 3 to 6 feet building to 5 to 9 feet,
then subsiding to 4 to 7 feet tonight. Waves 3 to 6 feet
Saturday.

Superior North Central...GALE WARNING IN EFFECT...11540 11550
11651 12641 13630. A chance of snow showers Saturday. Waves 5 to
8 feet building to 7 to 11 feet tonight, then subsiding to 3 to 6
feet Saturday.

Superior South Central 11430 12530 14630 11620. A chance of snow
showers Saturday afternoon. Waves 1 to 3 feet building to 3 to 5
feet tonight, then subsiding to 1 to 3 feet Saturday. Wave
heights are for ice free areas.

Superior East 11530 11540 11541 11631 11630 12631 11630. A chance
of snow showers Saturday. Waves 2 to 4 feet building to 5 to 8
feet tonight, then subsiding to 3 to 6 feet Saturday.

$$

BW

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes

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