252
FZUS63 KMQT 031957
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
357 PM EDT Sun May 3 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 29.6 inch trough moves over Lake Superior today before lifting
into northern Ontario. A deepening 29.3 inch low digs over the
Canadian Prairies tonight and then deepens to 29.1 inches over
northern Ontario on Monday. The low lifts into James Bay by Monday
evening as 30.1 inch ridging builds just to the east of the Canadian
Rockies. As the high pressure ridging shifts to the Canadian
Prairies Tuesday and Wednesday, the now-29.2 inch low continues
lifting into far northern Quebec. Thursday into Friday, the weather
pattern becomes nebulous as major pressure systems remain far away
from the Upper Great Lakes.


LSZ162-040800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
357 PM EDT Sun May 3 2026 /257 PM CDT Sun May 3 2026/

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of rain showers after midnight.
Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...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 rain showers through early afternoon. Waves subsiding
to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 5 to 15 knots veering northwest.
Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering northwest. 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-
357 PM EDT Sun May 3 2026

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves 1 to
3 feet.
.TONIGHT...Southwest winds 5 to 15 knots increasing to 20 to
30 knots. A slight chance of rain showers after midnight. Waves
building to 4 to 7 feet occasionally to 9 feet.
.MONDAY...Southwest winds 20 to 30 knots veering west in the
afternoon, then diminishing to 15 to 25 knots late. A chance of
rain showers through early afternoon. Waves building to 5 to
8 feet occasionally to 10 feet.
.MONDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering northwest. Waves
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-
357 PM EDT Sun May 3 2026

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves 1 to
3 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming south 10 to
20 knots after midnight, then becoming southwest 20 to 30 knots
late. A slight chance of rain showers after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...Southwest winds 20 to 30 knots veering west in the
afternoon. A chance of rain showers through early afternoon.
Waves building to 6 to 9 feet occasionally to 11 feet.
.MONDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves subsiding to 2 to 4 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-040800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
357 PM EDT Sun May 3 2026

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...West winds 10 to 20 knots backing south after
midnight, then becoming southwest 15 to 25 knots late. Waves
building to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon. A chance of rain showers through early
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...West winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible after midnight,
then diminishing to 20 to 30 knots late. Waves subsiding to 2 to
4 feet.
.TUESDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots. 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-
357 PM EDT Sun May 3 2026

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots becoming south 10 to 20 knots
after midnight, then increasing to 15 to 25 knots late. A slight
chance of rain showers after midnight. Waves building to 3 to
6 feet occasionally to 8 feet.
.MONDAY...Southwest winds 20 to 30 knots veering west in the
afternoon. A chance of rain showers. Waves building to 6 to
9 feet occasionally to 11 feet.
.MONDAY NIGHT...West winds 20 to 30 knots. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots. 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-
357 PM EDT Sun May 3 2026

.LATE THIS AFTERNOON...West winds 10 to 20 knots. A slight chance
of rain showers. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing south after midnight,
then increasing to 15 to 25 knots late. Waves building to 3 to
5 feet occasionally to 7 feet.
.MONDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots in the afternoon, then veering west late. A chance of
rain showers. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...West winds 20 to 30 knots. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ261-040200-
MAFOR 0321/
Superior West 12510 11520 12540 13630. A chance of showers Monday
morning. Waves 1 to 2 feet building to 3 to 6 feet tonight. Waves
3 to 6 feet Monday.

Superior North Central 11610 11510 11410 11430 12540 12640. A
chance of rain showers Monday morning. Waves 1 to 3 feet building
to 3 to 5 feet tonight. Waves 3 to 6 feet building to 6 to 9 feet
Monday.

Superior South Central 12610 11410 11420 11430 11530 11630 11640.
A chance of showers Monday. Waves 1 to 2 feet building to 2 to 4
feet tonight. Waves 3 to 6 feet Monday.

Superior East 12600 11500 11420 12440 11540 11630. A chance of
rain showers Monday. Waves 1 to 2 feet building to 2 to 4 feet
tonight. Waves 4 to 7 feet subsiding to 3 to 6 feet Monday.

$$

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