869
FZUS63 KMQT 131401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Wed May 13 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 low departs the region today, tracking over eastern
Ontario where it will stall through Thursday morning. Ridging moves
back over Lake Superior in its wake and builds to 30.1 inches
tonight into Thursday. This ridging is pressed southeast to the
Lower Great Lakes late Thursday into Friday while a 29.1 inch low
emanates off the Canadian Rockies. This low is expected to bring
troughing of 29.6 inches over Lake Superior Friday and Friday night
as it tracks to near James Bay at 29.3 inches by Saturday morning.
Ridging of 30.1 inches builds over the lake from northern Ontario
Saturday night into Sunday, followed by another 29.7 inch trough
extending from the central Plains early next week.


LSZ162-132000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Wed May 13 2026 /901 AM CDT Wed May 13 2026/

.REST OF TODAY...Northwest winds 5 to 15 knots backing southwest
late. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots backing northeast after
midnight, then veering east late. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 15 to
25 knots. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...East winds 15 to 25 knots veering south after
midnight. Rain showers likely. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY NIGHT...Southwest winds 20 to 30 knots veering west after
midnight. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...West winds 15 to 25 knots becoming northeast 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SUNDAY...Northeast winds 20 to 30 knots increasing to gales to
35 knots. A chance of rain showers, then rain showers likely.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.

$$

LSZ263-132000-
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 AM EDT Wed May 13 2026

.REST OF TODAY...Northwest winds 5 to 15 knots backing west in
the afternoon. Waves calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering northeast after
midnight, then becoming east less than 10 knots late. Waves calm
to 2 feet.
.THURSDAY...East winds less than 10 knots increasing to 10 to
20 knots. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...Southeast winds 20 to 30 knots becoming south
15 to 25 knots after midnight. A chance of rain showers through
midnight, then rain showers likely after midnight. Waves building
to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...South winds 15 to 25 knots veering southwest by mid
afternoon. A slight chance of showers through early afternoon.
Waves building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY...West gales to 35 knots becoming east 5 to 15 knots.
Waves building to 6 to 9 feet occasionally to 11 feet, then
subsiding to calm to 2 feet.
.SUNDAY...East winds 20 to 30 knots. Rain showers likely. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet.

$$

LSZ264-132000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Wed May 13 2026

.REST OF TODAY...Northwest winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming north 5 to
15 knots after midnight, then diminishing to less than 10 knots
late. Waves subsiding to calm to 2 feet.
.THURSDAY...East winds less than 10 knots becoming southeast 5 to
15 knots in the afternoon, then increasing to 10 to 20 knots
late. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...Southeast winds 20 to 30 knots veering south
after midnight. Rain showers likely after midnight. Waves
building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...South winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. A chance of rain showers through early
afternoon. Waves subsiding to 3 to 6 feet occasionally to 8 feet,
then building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming west
gales to 35 knots after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY...West gales to 35 knots becoming northeast 5 to
15 knots. Waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 20 to 30 knots.
Rain showers likely. Waves building to 3 to 6 feet occasionally
to 8 feet.

$$

LSZ265-132000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Wed May 13 2026

.REST OF TODAY...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots late. Waves 4 to 7 feet occasionally to 9 feet
subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering east in the
afternoon, then increasing to 15 to 25 knots late. Waves building
to 2 to 4 feet.
.THURSDAY NIGHT...Southeast winds 20 to 30 knots veering south
after midnight. A chance of rain showers after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...South winds 20 to 30 knots. A chance of rain showers
through early afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots veering west after
midnight. Waves subsiding to 2 to 4 feet, then building to 3 to
6 feet occasionally to 8 feet.
.SATURDAY...West gales to 40 knots becoming east 5 to 15 knots.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to calm to 2 feet.
.SUNDAY...East winds 15 to 25 knots increasing to 20 to 30 knots.
Rain showers likely. Waves building to 4 to 7 feet occasionally
to 9 feet.

$$

LSZ266-132000-
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 AM EDT Wed May 13 2026

.REST OF TODAY...North winds 20 to 30 knots backing northwest in
the afternoon. Waves 5 to 8 feet occasionally to 10 feet
subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming north 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 5 to 15 knots veering southeast in the
afternoon, then increasing to 10 to 20 knots late. Waves
subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 20 to 30 knots becoming south
gales to 35 knots after midnight. A chance of rain showers after
midnight. Waves building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...South gales to 35 knots. Rain showers likely through
early afternoon. Waves building to 6 to 9 feet occasionally to
11 feet.
.FRIDAY NIGHT...South gales to 35 knots becoming southwest 20 to
30 knots after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 4 to 7 feet occasionally
to 9 feet.
.SATURDAY...West gales to 40 knots becoming north 5 to 15 knots.
Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 20 to 30 knots.
Rain showers likely. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.

$$

LSZ267-132000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Wed May 13 2026

.REST OF TODAY...North winds 20 to 30 knots backing northwest in
the afternoon. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming north 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots becoming south
15 to 25 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...South winds 20 to 30 knots. A chance of rain showers
through early afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots becoming southwest
15 to 25 knots after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...West gales to 35 knots becoming northeast 5 to
15 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming southeast 20 to
30 knots. Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ261-132000-
MAFOR 1315/
Superior West 11700 11600 12500 11100 13200. Waves 2 feet or
less.

Superior North Central 14720 11810 12800 11200. Waves 1 to 3 feet
this afternoon and tonight. Waves 2 feet or less Thursday
morning.

Superior South Central 12740 12730 11720 11810 11700 11800. Waves
3 to 6 feet this afternoon. Waves 3 to 5 feet subsiding to 1 to 3
feet tonight. Waves 2 feet or less Thursday morning.

Superior East 11730 12740 11730 11820 12810 11800. Waves 3 to 6
feet this afternoon. Waves 3 to 6 feet subsiding to 2 to 4 feet
tonight. Waves 1 to 2 feet Thursday morning.

$$

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