480
FZUS63 KMQT 251403
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 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...

Ridging slowly rises over Lake Superior to 30.1 inches by Sunday
morning 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-
1002 AM EDT Sat Apr 25 2026 /902 AM CDT Sat Apr 25 2026/

.REST OF TODAY...Southeast winds 5 to 15 knots backing east in
the afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight. Patchy fog. A chance of rain showers. 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 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...Northeast winds 15 to 25 knots becoming north
20 to 30 knots after midnight. Rain showers. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...West winds 20 to 30 knots becoming northwest 10 to
20 knots. A chance of rain showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
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-
1002 AM EDT Sat Apr 25 2026

.REST OF TODAY...West winds less than 10 knots backing southwest
in the afternoon, then becoming east 5 to 15 knots late. Waves
calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots. Patchy fog. 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.
.MONDAY...East winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. A slight chance of rain showers through early
afternoon, then rain showers likely and a slight chance of
thunderstorms by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.MONDAY NIGHT...East winds 20 to 30 knots diminishing to 15 to
25 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 gales to 35 knots becoming northwest 15 to
25 knots. A chance of rain showers. Waves subsiding to 4 to
7 feet occasionally to 9 feet, then building to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ264-252000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1002 AM EDT Sat Apr 25 2026

.REST OF TODAY...Northwest winds less than 10 knots backing south
late. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots diminishing to less than
10 knots after midnight, then becoming east 5 to 15 knots late.
Patchy fog after midnight. 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 building to 1 to 3 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 8 to 12 feet occasionally to 15 feet.
.TUESDAY...West gales to 40 knots becoming northwest 20 to
30 knots. A chance of rain showers. Waves subsiding to 5 to
8 feet occasionally to 10 feet, then building to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ265-252000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 AM EDT Sat Apr 25 2026

.REST OF TODAY...Northwest winds 5 to 15 knots veering east late.
Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots. Patchy fog after
midnight. 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 building to 1 to 3 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 5 to 8 feet occasionally to 10 feet.
.MONDAY NIGHT...Southeast gales to 40 knots. Rain showers. Waves
building to 7 to 11 feet occasionally to 14 feet.
.TUESDAY...West gales to 40 knots becoming northwest gales to
35 knots. A chance of rain showers. Waves subsiding to 5 to
8 feet occasionally to 10 feet, then building to 6 to 9 feet
occasionally to 11 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-
1002 AM EDT Sat Apr 25 2026

.REST OF TODAY...North winds 5 to 15 knots backing northwest in
the afternoon, then veering north late. Patchy fog by late
morning. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight,
then backing southeast late. Patchy fog after midnight. 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 building to 1 to 3 feet.
.MONDAY...Southeast winds 20 to 30 knots increasing to gales to
40 knots by mid afternoon. A slight chance of rain showers by mid
afternoon. Waves building to 7 to 10 feet occasionally to
13 feet.
.MONDAY NIGHT...Southeast gales to 40 knots. Rain showers. Waves
building to 8 to 12 feet occasionally to 15 feet.
.TUESDAY...West gales to 45 knots becoming northwest gales to
35 knots. A chance of rain showers. Waves subsiding to 7 to
10 feet occasionally to 13 feet, then building to 8 to 11 feet
occasionally to 14 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-
1002 AM EDT Sat Apr 25 2026

.REST OF TODAY...Northwest winds 5 to 15 knots backing west in
the afternoon, then veering northwest late. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight,
then backing southeast late. Patchy fog after midnight. 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 6 to 9 feet
occasionally to 11 feet.
.MONDAY NIGHT...Southeast gales to 45 knots. A chance of rain
showers through midnight. Rain showers after midnight. Waves
building to 6 to 10 feet occasionally to 13 feet.
.TUESDAY...West gales to 35 knots veering northwest. Rain showers
likely. Waves subsiding to 5 to 8 feet occasionally to 10 feet,
then building to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ261-252000-
MAFOR 2515/
Superior West 11300 13200 11100 12110 11100. A chance of rain
showers overnight. Waves 1 foot or less.

Superior North Central 11700 11600 11400 13300 11200 11300. Waves
1 foot or less.

Superior South Central 11700 11800 11100 13300 12310. Waves 2
feet or less.

Superior East 11100 11700 11800 11200 11300 11400 11200 11300.
Waves 1 foot 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