362
FZUS63 KMQT 040201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Wed Sep 3 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 29.5 inch low over northeast Ontario retrogrades westward over far
northern Ontario tomorrow as it deepens to 29.3 inches. While this
low remains in place tomorrow night, a quick moving low traverses
through Wisconsin at 29.4 inches. This low then lifts northeast into
Ontario by Friday afternoon, then to near James Bay Friday night
while consolidating with the northern Ontario low. The consolidated
low then shifts northeast through far northern Quebec on Saturday as
30.1 inch high pressure moves into the Midwest for the weekend,
strengthening to 30.3 inches over the Upper Mississippi Valley on
Sunday. This high brings 30.2 inch ridging over Lake Superior
Sunday. Ridging begins to dissipate over the Upper Great Lakes on
Monday as the high continues east towards New England.


LSZ162-040800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Wed Sep 3 2025 /901 PM CDT Wed Sep 3 2025/

.REST OF TONIGHT...Northwest winds 15 to 25 knots. A slight
chance of waterspouts. A slight chance of showers. Waves 3 to
6 feet occasionally to 8 feet.
.THURSDAY...West winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. A chance of showers. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight, then increasing to 15 to 25 knots
late. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 20 to 30 knots backing west by mid
afternoon. A slight chance of showers. Waves building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY NIGHT...West winds 15 to 25 knots veering northwest after
midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...Northwest winds 15 to 25 knots. Waves subsiding to
calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots backing south. A chance
of showers. Waves calm to 2 feet.

$$

LSZ263-040800-
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-
1001 PM EDT Wed Sep 3 2025

.REST OF TONIGHT...Northwest winds 20 to 30 knots. A slight
chance of waterspouts. Scattered showers. Waves 4 to 8 feet
occasionally to 10 feet.
.THURSDAY...West winds 20 to 30 knots. A slight chance of
waterspouts through early afternoon. A chance of showers. Waves
4 to 7 feet occasionally to 9 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming northwest 15 to 25 knots
late. A chance of showers. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.FRIDAY...Northwest winds 20 to 30 knots becoming west gales to
35 knots by mid afternoon. A slight chance of showers. Waves
building to 5 to 8 feet occasionally to 10 feet.
.FRIDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. A slight chance of showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...Northwest winds 15 to 25 knots. Waves subsiding to
1 to 3 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots. Waves 1 to 3 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots backing south. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ264-040800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Wed Sep 3 2025

...GALE WARNING IN EFFECT UNTIL 11 PM EDT THIS EVENING...

.REST OF TONIGHT...Northwest winds 20 to 30 knots. A slight
chance of waterspouts. Numerous showers by midnight. A chance of
showers after midnight. Waves 8 to 11 feet occasionally to
14 feet subsiding to 6 to 9 feet occasionally to 11 feet.
.THURSDAY...Northwest winds 20 to 30 knots backing west in the
afternoon. A slight chance of waterspouts through early
afternoon. A chance of showers. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then veering northwest late. A chance of
showers. Waves subsiding to 1 to 3 feet.
.FRIDAY...Northwest winds 20 to 30 knots becoming west gales to
35 knots by mid afternoon. A slight chance of showers. Waves
building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. A slight chance of showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...Northwest winds 15 to 25 knots. Waves subsiding to
1 to 3 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. Waves 1 to 3 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south. Waves calm
to 2 feet.

$$

LSZ265-040800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Wed Sep 3 2025

...GALE WARNING IN EFFECT UNTIL 11 PM EDT THIS EVENING...

.REST OF TONIGHT...Northwest winds to 30 knots with a few gale
force gusts to 35 knots possible. A slight chance of waterspouts.
Numerous showers by midnight. A chance of showers after midnight.
Waves 7 to 10 feet occasionally to 13 feet subsiding to 4 to
7 feet occasionally to 9 feet.
.THURSDAY...West winds to 30 knots with a few gale force gusts to
35 knots possible diminishing to 20 to 30 knots late. A slight
chance of waterspouts through early afternoon. A chance of
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...Southwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then becoming west 15 to 25 knots
late. A chance of showers. Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 20 to 30 knots backing west by mid
afternoon. A chance of showers. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of showers. Waves subsiding to
calm to 2 feet.
.SATURDAY...Northwest winds 15 to 25 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing southwest. Waves
calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots backing south. Waves
calm to 2 feet.

$$

LSZ266-040800-
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-
1001 PM EDT Wed Sep 3 2025

.REST OF TONIGHT...Northwest winds to 30 knots with a few gale
force gusts to 35 knots possible. A slight chance of waterspouts.
Showers. Waves 9 to 12 feet occasionally to 15 feet subsiding to
8 to 11 feet occasionally to 14 feet.
.THURSDAY...West winds to 30 knots with a few gale force gusts to
35 knots possible diminishing to 20 to 30 knots in the afternoon.
A slight chance of waterspouts through early afternoon. Showers
likely through early afternoon, then a chance of showers by mid
afternoon. Waves subsiding to 6 to 9 feet occasionally to
11 feet.
.THURSDAY NIGHT...Southwest winds 15 to 25 knots. A chance of
showers through midnight, then showers likely after midnight.
Waves subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 15 to 25 knots becoming west 20 to
30 knots by mid afternoon. A chance of showers. Waves building to
4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...West winds 15 to 25 knots. A chance of showers.
Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Northwest winds 15 to 25 knots. A chance of showers.
Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. A chance of
showers. Waves subsiding to 1 to 3 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots backing south. Waves
calm to 2 feet.

$$

LSZ267-040800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Wed Sep 3 2025

.REST OF TONIGHT...Northwest winds 20 to 30 knots increasing to
30 knots with a few gale force gusts to 35 knots possible after
midnight, then backing west late. A slight chance of waterspouts.
Showers likely. Waves 8 to 11 feet occasionally to 14 feet
building to 9 to 12 feet occasionally to 15 feet, then subsiding
to 8 to 11 feet occasionally to 14 feet.
.THURSDAY...West winds to 30 knots with a few gale force gusts to
35 knots possible diminishing to 20 to 30 knots late. A slight
chance of waterspouts through early afternoon. Showers likely
through early afternoon, then a chance of showers by mid
afternoon. Waves subsiding to 6 to 9 feet occasionally to
11 feet.
.THURSDAY NIGHT...Southwest winds 15 to 25 knots backing south
after midnight. A chance of showers through midnight, then
showers likely after midnight. Waves subsiding to 2 to 4 feet.
.FRIDAY...West winds 15 to 25 knots increasing to gales to
35 knots by mid afternoon. Showers through early afternoon, then
a chance of showers by mid afternoon. Waves subsiding to 1 to
3 feet, then building to 5 to 8 feet occasionally to 10 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of showers. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 15 to 25 knots veering northwest by mid
afternoon. A chance of showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. A chance of
showers. Waves subsiding to 1 to 3 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west. A chance
of showers. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots backing south. Waves
building to 1 to 3 feet.

$$

LSZ261-040800-
MAFOR 0403/
Superior West 11730 11740 12730 14630. A chance of showers
Thursday evening. Waves 3 to 6 feet.

Superior North Central 13746 11740 13640 11630. Waves 7 to 11
feet subsiding to 6 to 9 feet overnight. Waves 5 to 9 feet
Thursday. Waves 4 to 7 feet subsiding to 3 to 6 feet Thursday
evening.

Superior South Central 12746 11740 11746 13640 11520. Waves 9 to
12 feet subsiding to 7 to 10 feet overnight. Waves 6 to 10 feet
subsiding to 5 to 8 feet Thursday. Waves 4 to 7 feet subsiding to
3 to 5 feet Thursday evening.

Superior East 12746 12646 13640 11530. Waves 7 to 11 feet
overnight and Thursday. Waves 6 to 10 feet Thursday evening.

$$

WFO MQT

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