913
FZUS63 KMQT 170801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Tue Mar 17 2026

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 20.1 ridge will move through Lake Superior today. A 29.7 inch
trough over the Canadian Prairie Wednesday morning will begin to
push towards the lake on Wednesday, weakening to 29.8 inches over
northern Ontario Wednesday night. Weak ridging of around 30.1 inches
will build over the lake on Thursday ahead of the next clipper low
approaching the region on Friday at around 29.7 inches.


LSZ162-172000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Tue Mar 17 2026 /300 AM CDT Tue Mar 17 2026/

.EARLY THIS MORNING...North winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TODAY...Northwest winds 10 to 20 knots backing southwest in the
afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then veering southwest late. A chance of
snow showers. Waves building to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots late. A slight chance of snow showers through early
afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots veering
northwest after midnight. A slight chance of rain showers,
possibly mixed with snow through midnight. Waves subsiding to
calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering south by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots. A chance of snow showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming north 20 to
30 knots. Waves subsiding to 2 to 4 feet, then building to 4 to
7 feet occasionally to 9 feet.

$$

LSZ263-172000-
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-
400 AM EDT Tue Mar 17 2026

...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 2 PM EDT THIS
AFTERNOON...

.EARLY THIS MORNING...North winds 20 to 30 knots. Heavy freezing
spray. Isolated snow showers. Waves 6 to 9 feet occasionally to
11 feet subsiding to 4 to 7 feet occasionally to 9 feet.
.TODAY...Northwest winds 15 to 25 knots becoming west 5 to
15 knots in the afternoon, then backing southwest late. Isolated
snow showers through early afternoon. Waves subsiding to calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A slight chance of snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots. A slight chance of
snow showers through early afternoon. Waves subsiding to 2 to
4 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. A slight chance of rain and snow showers. Waves
subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering south by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. A chance of snow showers. Waves
calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots becoming east 20 to
30 knots. A chance of snow showers, possibly mixed with rain.
Waves building to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...Southeast winds 15 to 25 knots becoming north gales
to 35 knots. A chance of rain showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet, then building to 7 to 10 feet
occasionally to 13 feet.

$$

LSZ264-172000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Tue Mar 17 2026

...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 2 PM EDT THIS
AFTERNOON...

.EARLY THIS MORNING...North gales to 35 knots. Heavy freezing
spray. Isolated snow showers. Waves 9 to 12 feet occasionally to
15 feet subsiding to 7 to 10 feet occasionally to 13 feet.
.TODAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon, then becoming west 5 to 15 knots late.
Heavy freezing spray through early afternoon. Isolated snow
showers through early afternoon. Waves subsiding to calm to
2 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming south 10 to
20 knots after midnight. A slight chance of snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots veering west late. A
slight chance of snow showers through early afternoon. Waves 3 to
5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots becoming north 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 5 to 15 knots veering south by mid
afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. A chance of snow showers. Waves
calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots becoming east 20 to
30 knots. A chance of snow showers. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY...Southeast winds 20 to 30 knots becoming north gales
to 40 knots. A chance of rain showers. A chance of snow showers.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 5 to 8 feet occasionally to 10 feet.

$$

LSZ265-172000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Tue Mar 17 2026

...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 2 PM EDT THIS
AFTERNOON...

.EARLY THIS MORNING...North gales to 35 knots. Heavy freezing
spray. Scattered snow showers. Waves 12 to 17 feet occasionally
to 21 feet subsiding to 10 to 14 feet occasionally to 18 feet.
.TODAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon, then becoming west 10 to 20 knots
late. Heavy freezing spray through early afternoon. Scattered
snow showers. Waves subsiding to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 20 to
30 knots. A slight chance of snow showers after midnight. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.WEDNESDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots in the afternoon, then veering west late. A slight
chance of snow showers through early afternoon. Waves subsiding
to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots. A slight chance of
rain showers. A slight chance of snow showers after midnight.
Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots veering southeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots becoming west 15 to
25 knots after midnight. A chance of snow showers, possibly mixed
with rain. Waves calm to 2 feet.
.FRIDAY...Northeast winds 15 to 25 knots becoming east 20 to
30 knots. A chance of snow showers, possibly mixed with rain.
Waves building to 6 to 9 feet occasionally to 11 feet.
.SATURDAY...Southeast winds 20 to 30 knots becoming north gales
to 35 knots. A chance of snow showers, possibly mixed with rain.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.

$$

LSZ266-172000-
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-
400 AM EDT Tue Mar 17 2026

...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH THIS
AFTERNOON...

.EARLY THIS MORNING...North gales to 40 knots. Heavy freezing
spray. Scattered snow showers. Waves 15 to 20 feet occasionally
to 25 feet subsiding to 11 to 15 feet occasionally to 19 feet.
.TODAY...North gales to 35 knots becoming northwest 15 to
25 knots in the afternoon, then becoming west 10 to 20 knots
late. Heavy freezing spray through early afternoon. Scattered
snow showers. Waves subsiding to 2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming south 15 to
25 knots after midnight, then increasing to 20 to 30 knots late.
A slight chance of snow showers. Freezing spray after midnight.
Waves subsiding to 1 to 3 feet, then building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...South winds 20 to 30 knots veering southwest in the
afternoon, then diminishing to 15 to 25 knots late. Freezing
spray through early afternoon. A chance of snow showers. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots. A slight chance of
rain and snow showers after midnight. Waves subsiding to 1 to
3 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of snow showers. A chance
of rain showers after midnight. Waves building to 2 to 4 feet.
.FRIDAY...North winds 15 to 25 knots becoming east 20 to
30 knots. A chance of snow showers, possibly mixed with rain.
Waves building to 6 to 9 feet occasionally to 11 feet.
.SATURDAY...Southeast winds 20 to 30 knots becoming north gales
to 40 knots. A chance of snow showers, possibly mixed with rain.
Waves building to 6 to 10 feet occasionally to 13 feet.

$$

LSZ267-172000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Tue Mar 17 2026

...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH THIS
AFTERNOON...

.EARLY THIS MORNING...North gales to 40 knots. Heavy freezing
spray. Scattered snow showers. Waves 10 to 14 feet occasionally
to 18 feet subsiding to 10 to 14 feet occasionally to 18 feet.
.TODAY...North gales to 35 knots becoming northwest 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. Heavy freezing spray through early afternoon. Scattered
snow showers. Waves subsiding to 2 to 4 feet.
.TONIGHT...West winds 5 to 15 knots becoming south 15 to 25 knots
after midnight. Scattered snow showers. Waves subsiding to 1 to
3 feet, then building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots late. A chance of snow showers. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. A slight chance of snow showers.
Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots. A chance of
snow showers. Waves building to 2 to 4 feet.
.FRIDAY...North winds 15 to 25 knots becoming east 20 to
30 knots. A chance of rain and snow showers. Waves subsiding to
1 to 3 feet, then building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southeast winds 20 to 30 knots becoming north gales
to 35 knots. A chance of snow showers. A chance of rain showers.
Waves building to 10 to 14 feet occasionally to 18 feet, then
subsiding to 9 to 12 feet occasionally to 15 feet.

$$

LSZ261-171400-
MAFOR 1709/
Superior West...HEAVY FREEZING SPRAY WARNING IN EFFECT...11830
11720 11710 12510 12420 11430. A chance of snow showers tonight.
Waves 3 to 5 feet subsiding to 1 to 3 feet today. Waves 1 to 3
feet building to 2 to 4 feet tonight.

Superior North Central...GALE WARNING IN EFFECT...HEAVY FREEZING
SPRAY WARNING IN EFFECT...11852 11842 11732 12610 11510 11420
11430. Waves 8 to 12 feet subsiding to 2 to 4 feet today. Waves 1
to 2 feet building to 2 to 4 feet tonight.

Superior South Central...GALE WARNING IN EFFECT...HEAVY FREEZING
SPRAY WARNING IN EFFECT...11852 19857 11752 19757 11742 19747
11722 11610 11510 12430. Waves 10 to 15 feet subsiding to 3 to 6
feet today. Waves 2 to 4 feet building to 3 to 5 feet tonight.

Superior East...GALE WARNING IN EFFECT...HEAVY FREEZING SPRAY
WARNING IN EFFECT...11852 19857 11842 19847 11832 19837 11720
19727 11710 19717 11610 11530 11430. Waves 10 to 14 feet
subsiding to 3 to 5 feet today. Waves 2 to 4 feet building to 3
to 6 feet tonight. Wave heights are for ice free areas.

$$

WFO MQT

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

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