801
FZUS63 KMQT 250801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Sat Apr 25 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...

Lake Superior is currently in 30.0 inch ridging between 29.8 inch
low pressures over Lake Erie and southern Saskatchewan. As both lows
dissipate today, ridging builds over the lake to 30.2 inches as 30.4
inch high pressure over northern Quebec builds. The pattern remains
stable over Lake Superior Sunday while a 29.3 inch Colorado Low
develops. Throughout Monday, this low moves northeast, arriving in
Wisconsin Monday night. The low then crosses Lake Superior Tuesday,
reaching James Bay Tuesday night. In the wake of the low, 30.2 inch
high pressure builds over the Canadian Prairie, sending 30.1 inch
high pressure over the lake Wednesday. This high approaches the
Great Lakes slowly Thursday.


LSZ162-252000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Sat Apr 25 2026 /301 AM CDT Sat Apr 25 2026/

.EARLY THIS MORNING...North winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...Northeast winds 5 to 15 knots veering east in the
afternoon. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots. A chance of rain
showers after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots late. A slight chance of rain showers through early
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots. A slight chance
of rain showers after midnight. Waves building to 2 to 4 feet.
.MONDAY...East winds 15 to 25 knots. A chance of rain showers
through early afternoon, then rain showers by mid afternoon.
Waves building to 5 to 8 feet occasionally to 10 feet.
.MONDAY NIGHT...Northeast winds 15 to 25 knots becoming north
20 to 30 knots after midnight. Rain showers. Waves building to
7 to 10 feet occasionally to 13 feet, then subsiding to 5 to
8 feet occasionally to 10 feet.
.TUESDAY...West winds 20 to 30 knots becoming northwest 10 to
20 knots. A chance of rain showers. Waves subsiding to 4 to
8 feet occasionally to 10 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ263-252000-
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-
401 AM EDT Sat Apr 25 2026

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...North winds 5 to 15 knots backing southwest in the
afternoon, then backing east late. Patchy fog through early
afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots. A slight chance of rain
showers after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots backing northeast in the
afternoon. A slight chance of rain showers through early
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.MONDAY...East winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. Rain showers likely by mid afternoon. Waves
building to 6 to 9 feet occasionally to 11 feet.
.MONDAY NIGHT...East winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Rain showers. Waves building to 11 to
15 feet occasionally to 19 feet, then subsiding to 10 to 14 feet
occasionally to 18 feet.
.TUESDAY...West gales to 35 knots becoming northwest 15 to
25 knots. A chance of rain showers. Waves subsiding to 6 to
9 feet occasionally to 11 feet, then building to 9 to 12 feet
occasionally to 15 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-252000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Sat Apr 25 2026

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...Northwest winds 5 to 15 knots becoming west less than
10 knots in the afternoon, then backing south late. Patchy fog
through early afternoon. Waves calm to 2 feet.
.TONIGHT...East winds less than 10 knots veering southeast after
midnight, then backing east late. Waves calm to 2 feet.
.SUNDAY...East winds less than 10 knots increasing to 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 20 to 30 knots backing east by mid
afternoon. A chance of rain showers by mid afternoon. Waves
building to 6 to 9 feet occasionally to 11 feet.
.MONDAY NIGHT...Southeast gales to 35 knots. Rain showers. Waves
building to 12 to 17 feet occasionally to 21 feet, then subsiding
to 10 to 14 feet occasionally to 18 feet.
.TUESDAY...West gales to 40 knots becoming northwest 20 to
30 knots. A chance of rain showers. Waves subsiding to 8 to
11 feet occasionally to 14 feet, then building to 9 to 12 feet
occasionally to 15 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-252000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Sat Apr 25 2026

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...West winds 5 to 15 knots backing east late. Patchy fog
through early afternoon. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots backing east in the
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 20 to 30 knots increasing to gales to
40 knots by mid afternoon. A chance of rain showers by mid
afternoon. Waves building to 6 to 9 feet occasionally to 11 feet.
.MONDAY NIGHT...Southeast gales to 40 knots. Rain showers. Waves
building to 11 to 15 feet occasionally to 19 feet, then subsiding
to 10 to 14 feet occasionally to 18 feet.
.TUESDAY...West gales to 40 knots becoming northwest gales to
35 knots. A chance of rain showers. Waves subsiding to 8 to
11 feet occasionally to 14 feet, then building to 10 to 14 feet
occasionally to 18 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ266-252000-
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-
401 AM EDT Sat Apr 25 2026

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...Northwest winds 5 to 15 knots veering north late. Patchy
fog through early afternoon. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 20 to 30 knots increasing to gales to
40 knots by mid afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet.
.MONDAY NIGHT...Southeast gales to 40 knots. Rain showers. Waves
building to 11 to 15 feet occasionally to 19 feet, then subsiding
to 10 to 14 feet occasionally to 18 feet.
.TUESDAY...West gales to 45 knots becoming northwest gales to
35 knots. A chance of rain showers. Waves subsiding to 9 to
12 feet occasionally to 15 feet, then building to 10 to 14 feet
occasionally to 18 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ267-252000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Sat Apr 25 2026

.EARLY THIS MORNING...South winds 10 to 20 knots. Patchy dense
fog. Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots backing north late. Patchy
dense fog through early afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming southeast less than
10 knots after midnight, then increasing to 5 to 15 knots late.
Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.MONDAY...Southeast winds 15 to 25 knots increasing to gales to
40 knots by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.MONDAY NIGHT...Southeast gales to 45 knots. A chance of rain
showers through midnight. Rain showers after midnight. Waves
building to 10 to 14 feet occasionally to 18 feet, then subsiding
to 9 to 12 feet occasionally to 15 feet.
.TUESDAY...West gales to 35 knots veering northwest. Rain showers
likely. Waves subsiding to 7 to 10 feet occasionally to 13 feet,
then building to 10 to 14 feet occasionally to 18 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ261-251400-
MAFOR 2509/
Superior West 11800 14200 11200 12100. Waves 1 foot or less.

Superior North Central 13700 11600 11500 13300. Waves 2 feet or
less.

Superior South Central 12710 11700 11800 11200 13300. Waves 2
feet or less.

Superior East 11400 19404 11500 19504 11300 11500 11100 11200
12300. Waves 2 feet or less.

$$

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