688
FZUS63 KMQT 050900
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EST Thu Mar 5 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 30.6 inch high over far northern Ontario builds to 30.7 inches
over northwestern Quebec this morning. As the high shifts over
central Quebec today, a 29.4 inch low develops over Colorado. This
low will weaken to 29.6 inches as it reaches Wisconsin by Friday
night. Saturday, the low quickly jumps northeast to southwestern
Quebec, deepening to 29.3 inches. A 30.2 inch high over the central
to southern Plains will project a weak 29.8 inch ridge over the lake
Saturday night before a 29.1 inch low cuts across northern Ontario.
The low pushes into Quebec Monday quickly followed by a 29.2 inch
clipper low. By Tuesday morning, the lake will be between high of
30.3 inches over northern Ontario and 29.6 inch low pressure over
the Upper Mississippi River valley.


LSZ162-052100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EST Thu Mar 5 2026 /300 AM CST Thu Mar 5 2026/

...DENSE FOG ADVISORY IN EFFECT UNTIL 1 PM EST /NOON CST/ THIS
AFTERNOON...

.EARLY THIS MORNING...Northeast winds 20 to 30 knots. Patchy
dense fog. A slight chance of freezing rain, freezing drizzle and
snow showers. Waves 4 to 7 feet occasionally to 9 feet.
.TODAY...Northeast winds 15 to 25 knots. A slight chance of
freezing drizzle and snow showers in the morning. Areas of dense
freezing fog in the morning. Areas of dense fog. Waves subsiding
to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...East winds 10 to 20 knots diminishing to 5 to 15 knots
by midnight. Patchy fog. A slight chance of drizzle and freezing
drizzle after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Patchy fog in the morning. A chance of drizzle in the
morning. Rain showers likely. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Rain showers likely. A slight chance of
snow showers after midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 15 to 25 knots backing west in the
afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 20 to 30 knots increasing to
gales to 40 knots after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SUNDAY...Southwest gales to 35 knots diminishing to 15 to
25 knots. Waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to 2 to 4 feet.
.MONDAY...West winds 10 to 20 knots becoming northeast 15 to
25 knots. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.

$$

LSZ263-052100-
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 EST Thu Mar 5 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 1 PM EST THIS AFTERNOON...

.EARLY THIS MORNING...Northeast winds 20 to 30 knots. Patchy
dense fog. A slight chance of freezing rain, freezing drizzle and
snow showers. Waves 5 to 8 feet occasionally to 10 feet.
.TODAY...East winds 15 to 25 knots diminishing to 10 to 20 knots
by mid afternoon. A slight chance of freezing drizzle and snow
showers in the morning. Areas of dense freezing fog in the
morning. Patchy dense fog. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...East winds 10 to 20 knots becoming southeast 5 to
15 knots by midnight. Patchy fog. Waves subsiding to 2 to 4 feet.
.FRIDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Patchy fog in the morning. A chance of rain showers
and a slight chance of drizzle in the morning, then rain showers
likely in the afternoon. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots increasing to 15 to
25 knots after midnight. A chance of rain showers in the evening,
then rain showers likely, possibly mixed with snow showers after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 15 to 25 knots backing west in the
afternoon. A chance of snow showers, possibly mixed with rain in
the morning. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 20 to 30 knots increasing to
gales to 40 knots after midnight. Waves building to 6 to 9 feet
occasionally to 11 feet.
.SUNDAY...Southwest gales to 40 knots diminishing to 20 to
30 knots. Waves building to 7 to 10 feet occasionally to 13 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet.
.MONDAY...West winds 15 to 25 knots veering northeast. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.

$$

LSZ264-052100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EST Thu Mar 5 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 1 PM EST THIS AFTERNOON...

.EARLY THIS MORNING...East winds 15 to 25 knots. Patchy dense
fog. A slight chance of freezing rain, freezing drizzle and snow
showers. Waves 5 to 8 feet occasionally to 10 feet.
.TODAY...East winds 15 to 25 knots diminishing to 10 to 20 knots.
A slight chance of freezing drizzle and snow showers in the
morning. Patchy dense fog. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...East winds 10 to 20 knots veering southeast by
midnight. Patchy fog. Waves subsiding to 2 to 4 feet.
.FRIDAY...Southeast winds 10 to 20 knots. Patchy fog in the
morning. Rain showers likely in the afternoon. Waves 2 to 4 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots becoming north 15 to
25 knots after midnight. A chance of rain showers in the evening,
then rain showers, possibly mixed with snow after midnight. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.SATURDAY...North winds 20 to 30 knots backing west in the
afternoon. A chance of snow showers, possibly mixed with rain in
the morning. Waves building to 3 to 6 feet occasionally to
8 feet, then subsiding to 2 to 4 feet.
.SATURDAY NIGHT...Southwest winds 20 to 30 knots increasing to
gales to 40 knots after midnight. Waves building to 6 to 9 feet
occasionally to 11 feet.
.SUNDAY...Southwest gales to 45 knots diminishing to 20 to
30 knots. Waves building to 7 to 10 feet occasionally to 13 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY...West winds 20 to 30 knots becoming north 15 to
25 knots. Waves subsiding to 2 to 4 feet, then building to 3 to
6 feet occasionally to 8 feet.

$$

LSZ265-052100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EST Thu Mar 5 2026

...DENSE FOG ADVISORY IN EFFECT UNTIL 1 PM EST THIS AFTERNOON...

.EARLY THIS MORNING...East winds 15 to 25 knots. Areas of dense
fog. A slight chance of freezing drizzle. Waves 5 to 8 feet
occasionally to 10 feet.
.TODAY...East winds 15 to 25 knots. Patchy dense fog in the
morning. A slight chance of freezing drizzle in the morning.
Waves subsiding to 2 to 4 feet.
.TONIGHT...Southeast winds 15 to 25 knots diminishing to 10 to
20 knots late. Patchy fog. Waves subsiding to 1 to 3 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by late morning, then diminishing to 10 to 20 knots by
mid afternoon. Patchy fog in the morning. Rain showers likely in
the afternoon. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots becoming northwest
15 to 25 knots after midnight. A slight chance of thunderstorms
in the evening. Rain showers likely. Waves subsiding to calm to
2 feet.
.SATURDAY...Northwest winds 20 to 30 knots. A chance of snow
showers, possibly mixed with rain in the morning. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.SATURDAY NIGHT...Southwest winds 15 to 25 knots increasing to
gales to 35 knots after midnight. Waves subsiding to 1 to 3 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Southwest gales to 40 knots. Waves building to 3 to
6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet.
.MONDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots. Waves subsiding to calm to 2 feet, then building to
3 to 6 feet occasionally to 8 feet.

$$

LSZ266-052100-
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 EST Thu Mar 5 2026

.EARLY THIS MORNING...East winds 20 to 30 knots. Patchy fog. A
slight chance of freezing drizzle. Waves 5 to 8 feet occasionally
to 10 feet.
.TODAY...East winds 15 to 25 knots diminishing to 10 to 20 knots
by mid afternoon. Patchy fog in the morning. A slight chance of
freezing drizzle in the morning. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by midnight. Patchy fog. A slight chance of freezing
drizzle after midnight. Waves subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots by late morning, then diminishing to 15 to 25 knots by
mid afternoon. Patchy fog in the morning. Rain showers likely in
the afternoon. Waves subsiding to 2 to 4 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots becoming west 15 to
25 knots after midnight. Rain showers and a slight chance of
thunderstorms. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.
.SATURDAY...Northwest gales to 35 knots. A chance of rain and
snow showers in the morning. Waves building to 5 to 9 feet
occasionally to 11 feet.
.SATURDAY NIGHT...West winds 15 to 25 knots becoming southwest
gales to 40 knots after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 6 to 9 feet occasionally
to 11 feet.
.SUNDAY...Southwest gales to 40 knots. Waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.MONDAY...Southwest winds 20 to 30 knots becoming north 15 to
25 knots. Waves subsiding to 3 to 5 feet occasionally to 7 feet,
then building to 4 to 7 feet occasionally to 9 feet.

$$

LSZ267-052100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EST Thu Mar 5 2026

.EARLY THIS MORNING...East winds 15 to 25 knots. A slight chance
of freezing drizzle and snow showers. Waves 3 to 6 feet
occasionally to 8 feet.
.TODAY...East winds 15 to 25 knots diminishing to 10 to 20 knots.
Waves subsiding to 1 to 3 feet.
.TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by midnight. Patchy fog. A slight chance of freezing
drizzle after midnight. Waves 1 to 3 feet.
.FRIDAY...Southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Patchy fog in the morning. Rain
showers likely in the afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots veering south
after midnight. Rain showers and a slight chance of
thunderstorms. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.SATURDAY...West gales to 35 knots veering northwest in the
afternoon. A chance of rain showers, possibly mixed with snow in
the morning. Waves building to 5 to 9 feet occasionally to
11 feet.
.SATURDAY NIGHT...West winds 15 to 25 knots becoming southwest
gales to 35 knots after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 6 to 9 feet occasionally
to 11 feet.
.SUNDAY...Southwest gales to 40 knots. Waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.MONDAY...Southwest winds 20 to 30 knots becoming north 15 to
25 knots. Waves subsiding to 3 to 6 feet occasionally to 8 feet.

$$

LSZ261-051500-
MAFOR 0510/
Superior West 11140 19144 12130 19134 11130 12230 11220 11210.
Waves 4 to 7 feet subsiding to 3 to 6 feet today. Waves 3 to 5
feet subsiding to 1 to 3 feet tonight. Wave heights are for ice
free areas.

Superior North Central 13230 19234 12220 13320. Waves 5 to 8 feet
subsiding to 3 to 6 feet today. Waves 3 to 5 feet subsiding to 2
to 4 feet tonight. Wave heights are for ice free areas.

Superior South Central 13230 19234 11220 14320. Waves 5 to 8 feet
subsiding to 3 to 6 feet today. Waves 2 to 4 feet tonight. Wave
heights are for ice free areas.

Superior East 12240 13230 13330. Waves 4 to 7 feet subsiding to 2
to 4 feet today. Waves 2 to 4 feet tonight.

$$

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