671
FZUS63 KMQT 281446
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
946 AM EST Fri Feb 28 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...A 29.1 inch low will move southeast across Lake
Superior today and to near the Mackinac Strait by this evening. A
30.4 inch high pressure ridge from Manitoba this evening will
then shift southeast across the Upper Great Lakes Saturday night
into Sunday. Ridging over the region weakens to 30.0 inches Monday
as a low pressure at 29.7 inches tracks across northern Ontario.
This low drags weak 29.7 inch troughing across the lake Tuesday
before a deeper low pressure tracks northeast from the southern
Plains into the Great Lakes midweek.

LSZ162-282300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
946 AM EST Fri Feb 28 2025 /846 AM CST Fri Feb 28 2025/

...GALE WARNING IN EFFECT UNTIL 7 PM EST /6 PM CST/ THIS
EVENING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 7 PM EST /6 PM
CST/ THIS EVENING THROUGH SATURDAY MORNING...

.REST OF TODAY...West gales to 35 knots becoming north gales to
45 knots. A slight chance of rain late in the morning. A chance
of snow. Freezing spray in the afternoon. Waves 4 to 7 feet
occasionally to 9 feet building to 8 to 11 feet occasionally to
14 feet.
.TONIGHT...North gales to 35 knots diminishing to 15 to 25 knots.
Heavy freezing spray. Waves subsiding to 3 to 5 feet occasionally
to 7 feet.
.SATURDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. A chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-282300-
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-
946 AM EST Fri Feb 28 2025

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH SATURDAY
MORNING...

.REST OF TODAY...West winds 20 to 30 knots becoming north gales
to 45 knots with a few storm force gusts to 55 knots possible by
late morning, then diminishing to gales to 45 knots by mid
afternoon. A chance of rain late in the morning. A chance of
snow. Heavy freezing spray in the afternoon. Waves 5 to 8 feet
occasionally to 10 feet building to 15 to 20 feet occasionally to
25 feet.
.TONIGHT...North gales to 40 knots diminishing to 20 to 30 knots
late. A chance of snow showers in the evening. Heavy freezing
spray. Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.SATURDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots. A slight chance of snow showers in the morning. Waves
subsiding to 1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 20 to
30 knots. A chance of rain showers. A chance of snow showers.
Waves building to 3 to 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-282300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
946 AM EST Fri Feb 28 2025

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH SATURDAY
EVENING...

.REST OF TODAY...South winds 20 to 30 knots becoming northeast
gales to 45 knots with a few storm force gusts to 50 knots
possible by late morning, then becoming north gales to 45 knots
by mid afternoon. Snow, possibly mixed with rain late in the
morning, then snow likely in the afternoon. Heavy freezing spray
in the afternoon. Waves 9 to 12 feet occasionally to 15 feet
subsiding to 8 to 11 feet occasionally to 14 feet, then building
to 15 to 20 feet occasionally to 25 feet.
.TONIGHT...North gales to 45 knots diminishing to 20 to 30 knots
late. Heavy freezing spray. A chance of snow showers. Waves
subsiding to 6 to 9 feet occasionally to 11 feet.
.SATURDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots. Heavy freezing spray in the morning. A slight chance of
snow showers in the morning. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 20 to
30 knots. A chance of rain showers. A chance of snow showers.
Waves building to 3 to 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-282300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
946 AM EST Fri Feb 28 2025

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH SATURDAY
AFTERNOON...

.REST OF TODAY...South winds 15 to 25 knots becoming west gales
to 35 knots by late morning, then becoming north gales to
45 knots by mid afternoon. Snow likely, possibly mixed with rain.
Heavy freezing spray in the afternoon. Waves 6 to 9 feet
occasionally to 11 feet subsiding to 3 to 6 feet occasionally to
8 feet, then building to 15 to 20 feet occasionally to 25 feet.
.TONIGHT...North gales to 40 knots. Heavy freezing spray. Snow
showers likely in the evening. A chance of snow showers after
midnight. Waves subsiding to 8 to 11 feet occasionally to
14 feet.
.SATURDAY...Northwest winds 20 to 30 knots. Heavy freezing spray
in the morning. A chance of snow showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots becoming northeast 15 to
25 knots. A chance of rain showers. A chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-282300-
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-
946 AM EST Fri Feb 28 2025

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH SATURDAY
EVENING...

.REST OF TODAY...South gales to 45 knots backing north by mid
afternoon. Snow late in the morning. A slight chance of rain.
Snow likely in the afternoon. Heavy freezing spray in the
afternoon. Waves 9 to 12 feet occasionally to 15 feet building to
15 to 20 feet occasionally to 25 feet.
.TONIGHT...North gales to 45 knots. Heavy freezing spray. A
chance of snow showers. Waves subsiding to 9 to 12 feet
occasionally to 15 feet.
.SATURDAY...North gales to 35 knots backing northwest by late
morning, then diminishing to 20 to 30 knots by mid afternoon.
Heavy freezing spray. A chance of snow showers. Waves subsiding
to 5 to 8 feet occasionally to 10 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Freezing spray in the evening. A
slight chance of snow showers. Waves subsiding to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots veering southwest. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots increasing to 20 to
30 knots. A chance of rain showers. A chance of snow showers.
Waves building to 3 to 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-282300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
946 AM EST Fri Feb 28 2025

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH SATURDAY
EVENING...

.REST OF TODAY...Southeast gales to 40 knots becoming northeast
gales to 45 knots by mid afternoon. Freezing spray. Snow. Waves
7 to 10 feet occasionally to 13 feet subsiding to 5 to 8 feet
occasionally to 10 feet, then building to 10 to 14 feet
occasionally to 18 feet.
.TONIGHT...North gales to 40 knots. Heavy freezing spray. Snow
showers in the evening. A slight chance of snow showers after
midnight. Waves subsiding to 7 to 10 feet occasionally to
13 feet.
.SATURDAY...North winds 20 to 30 knots backing northwest by mid
afternoon. Heavy freezing spray. A chance of snow showers. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots becoming north
5 to 15 knots after midnight. Heavy freezing spray in the
evening. A chance of snow showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 2 to 4 feet.
.SUNDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves building to 1 to 3 feet.
.MONDAY...South winds 10 to 20 knots. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots backing northeast. A chance
of rain showers, possibly mixed with snow. Waves building to 3 to
5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-282300-
MAFOR 2816/
Superior West...GALE WARNING IN EFFECT...HEAVY FREEZING SPRAY
WARNING IN EFFECT...11761 11860 11850 11852 12842 12830. A chance
of snow this afternoon. Waves 5 to 8 feet building to 10 to 14
feet this afternoon. Waves 10 to 13 feet subsiding to 4 to 7 feet
tonight. Waves 3 to 5 feet subsiding to 2 to 4 feet Saturday
morning.

Superior North Central...GALE WARNING IN EFFECT...HEAVY FREEZING
SPRAY WARNING IN EFFECT...12177 11872 11862 12852 12842. A chance
of snow showers this evening. Waves 8 to 11 feet building to 14
to 18 feet this afternoon. Waves 14 to 18 feet subsiding to 7 to
10 feet tonight. Waves 5 to 8 feet Saturday morning.

Superior South Central...GALE WARNING IN EFFECT...HEAVY FREEZING
SPRAY WARNING IN EFFECT...11647 11777 12867 12852 11842 11742.
Waves 4 to 7 feet building to 11 to 15 feet this afternoon. Waves
14 to 18 feet subsiding to 10 to 13 feet tonight. Waves 8 to 11
feet subsiding to 6 to 9 feet Saturday morning.

Superior East...GALE WARNING IN EFFECT...HEAVY FREEZING SPRAY
WARNING IN EFFECT...11357 11167 11177 13852 11842 11832. A chance
of snow showers Saturday morning. Waves 8 to 11 feet building to
10 to 13 feet this afternoon. Waves 10 to 14 feet subsiding to 8
to 11 feet tonight. Waves 5 to 9 feet Saturday morning.

$$

Thompson

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

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