447
FZUS63 KMQT 040801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Thu Jun 4 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...

High pressure of 30.2 inches over the Ohio River Valley shifts
southeast and weakens to 30.1 inches today. Meanwhile, 30.0 inch
troughing over Lake Superior deepens to 29.8 inches through tonight
as a 29.7 inch low approaches from the northwest. Troughing persists
over the lake and gradually deepens to 29.7 inches through Friday
night. Weak ridging near 29.9 inches returns on Saturday extending
from a weak high of 30.0 inches over eastern Hudson Bay. Sunday, the
high builds to 30.1 inches over Quebec while 29.4 inch low pressure
spins over northern Saskatchewan. Monday, the high builds to 30.3
inches over the mouth of the St. Lawrence River while a 29.6 inch
low over northern Manitoba extends troughing south over the Great
Plains.



LSZ162-042000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Thu Jun 4 2026 /300 AM CDT Thu Jun 4 2026/

.EARLY THIS MORNING...South winds 5 to 15 knots. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots. A chance of showers and a
slight chance of thunderstorms. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight. A slight chance of thunderstorms through midnight. A
chance of rain showers. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. A slight chance of
showers and thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Northeast winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.MONDAY...Northeast winds 10 to 20 knots becoming east 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ263-042000-
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-
400 AM EDT Thu Jun 4 2026

.EARLY THIS MORNING...South winds 5 to 15 knots. A slight chance
of showers. Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots. A chance of showers and a
slight chance of thunderstorms. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering west late. A slight
chance of thunderstorms through midnight. A chance of rain
showers. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. A slight chance of
showers and thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots veering north after
midnight. A slight chance of rain showers through midnight. Waves
calm to 2 feet.
.SATURDAY...North winds less than 10 knots veering east by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots veering southeast. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering southeast. A chance of
showers. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.

$$

LSZ264-042000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Thu Jun 4 2026

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots. A slight chance of showers.
Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest late. A
slight chance of thunderstorms through midnight. A chance of rain
showers. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots diminishing to less than
10 knots in the afternoon, then backing south late. A slight
chance of rain showers. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds less than 10 knots backing north
after midnight. A slight chance of rain showers. Waves calm to
2 feet.
.SATURDAY...North winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds less than 10 knots veering east
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.

$$

LSZ265-042000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Thu Jun 4 2026

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...South winds 10 to 20 knots backing southeast late. A
slight chance of showers and thunderstorms by mid afternoon.
Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight, then becoming southwest 5 to 15 knots late. A slight
chance of thunderstorms through midnight. A chance of showers.
Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing east in the
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. A slight chance of showers. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves building to 1 to 3 feet.
.MONDAY...Southeast winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ266-042000-
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-
400 AM EDT Thu Jun 4 2026

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves 2 to
4 feet.
.TODAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon, then backing southeast late. A slight chance of
showers by mid afternoon. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 5 to
15 knots late. A slight chance of thunderstorms through midnight.
A chance of showers. Waves 1 to 3 feet.
.FRIDAY...South winds 5 to 15 knots backing east late. A chance
of showers. A slight chance of thunderstorms by mid afternoon.
Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots backing north after
midnight. A chance of rain showers. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves building to 1 to 3 feet.
.MONDAY...Southeast winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ267-042000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Thu Jun 4 2026

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves 2 to
4 feet.
.TODAY...South winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots. A chance of showers and a
slight chance of thunderstorms. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then backing southeast late. A slight chance of
showers. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots veering northwest after
midnight. A chance of rain showers. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots becoming west 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots veering southeast. Waves
calm to 2 feet.
.MONDAY...Southeast winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 1 to 3 feet.

$$

LSZ261-041400-
MAFOR 0409/
Superior West 11420 14410 11410 11510 11610. A chance of showers
today and overnight. Waves 2 feet or less.

Superior North Central 12410 12400 12300 11400 11500. A chance of
showers tonight. Waves 2 feet or less.

Superior South Central 12420 11410 12310 11410 12420. A chance of
showers this evening, then a chance of showers and thunderstorms
overnight. Waves 1 to 3 feet.

Superior East 11520 11420 13410 13420. A chance of showers
tonight. Waves 2 to 4 feet subsiding to 1 to 3 feet today. Waves
2 to 3 feet tonight.

$$

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