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FZUS63 KMQT 051401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM EDT Fri Jun 5 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 29.7 inch low over northwest Ontario is extending 29.8 inch
troughing over Lake Superior this morning. The low moves slowly east
along the northern shores of the lake today while deepening to 29.6
inches. By early Saturday morning, the low moves into Quebec,
shifting southeastwards towards the St. Lawrence Seaway through the
day as weak 29.9 inch ridging moves over Lake Superior late. In the
meantime, a 29.3 inch low pressure forms in the lee of the Rockies.
Ridging over Lake Superior builds to 30.1 inches by Sunday as the
Colorado low weakens to 29.4 inches and moves into the western
Dakotas. By Monday afternoon, expect Lake Superior to be between a
29.8 inch trough over Minnesota and 30.2 inch high pressure over New
England. The troughing weakens to 29.9 inches before moving over
Lake Superior on Tuesday. Pressure continues to fall over Lake
Superior through Wednesday as a second Colorado low moves in,
reaching 29.6 inches by late Wednesday.



LSZ162-052000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Fri Jun 5 2026 /901 AM CDT Fri Jun 5 2026/

.REST OF TODAY...Southwest winds 5 to 15 knots. A slight chance
of showers and thunderstorms by mid afternoon. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots veering northwest late. A
slight chance of showers and thunderstorms through midnight.
Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing south in the
afternoon, then backing east late. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots backing northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots. Waves building to 2 to
4 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Showers likely. Waves calm to
2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-052000-
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 Fri Jun 5 2026

.REST OF TODAY...Southwest winds less than 10 knots increasing to
5 to 15 knots in the afternoon. A slight chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight. A slight chance of showers and thunderstorms through
midnight. Waves calm to 2 feet.
.SATURDAY...West winds less than 10 knots becoming south 5 to
15 knots in the afternoon, then diminishing to less than 10 knots
late. 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 northeast 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...East winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight. Waves building to 2 to 4 feet, then
subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering southeast. A chance of
showers. Showers likely. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.

$$

LSZ264-052000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Fri Jun 5 2026

.REST OF TODAY...Southwest winds less than 10 knots backing south
late. Waves calm to 2 feet.
.TONIGHT...Southwest winds less than 10 knots veering west after
midnight, then becoming northwest 5 to 15 knots late. A slight
chance of rain showers after midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing west in the
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds less than 10 knots backing east
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. 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.
.TUESDAY...Southeast winds 5 to 15 knots veering south. A chance
of rain showers. Waves subsiding to calm to 2 feet.

$$

LSZ265-052000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Fri Jun 5 2026

.REST OF TODAY...Southwest winds 5 to 15 knots backing east in
the afternoon. A slight chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering west after midnight.
A slight chance of thunderstorms through midnight. A slight
chance of showers. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots veering north late.
Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds less than 10 knots becoming
east 5 to 15 knots after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots. Waves subsiding
to calm to 2 feet, then 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.
.TUESDAY...Southeast winds 10 to 20 knots becoming south 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ266-052000-
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 Fri Jun 5 2026

.REST OF TODAY...South winds 5 to 15 knots veering southwest in
the afternoon, then backing east late. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots veering west after midnight.
A slight chance of showers and thunderstorms. Waves calm to
2 feet.
.SATURDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots veering east
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots. Waves building to
1 to 3 feet.
.MONDAY...Southeast winds 15 to 25 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.TUESDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers. Waves subsiding to calm to 2 feet.

$$

LSZ267-052000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Fri Jun 5 2026

.REST OF TODAY...South winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing southeast late. A chance
of showers. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering west after midnight.
A chance of rain showers. A slight chance of thunderstorms after
midnight. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. 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 2 to 4 feet.
.TUESDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers. Waves subsiding to calm to 2 feet.

$$

LSZ261-052000-
MAFOR 0515/
Superior West 13500 13610 11700 11600. Waves 1 foot or less.

Superior North Central 12500 11400 12500 11600 12700. Waves 1
foot or less.

Superior South Central 11400 12200 11400 11500 11600 11700 11710.
A chance of showers this afternoon. Waves 1 foot or less.

Superior East 11410 11400 11300 11400 13600 11700. A chance of
showers this afternoon, overnight, and Saturday morning. Waves 2
feet 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