102
FZUS63 KMQT 220801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Wed Jul 22 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...

Heights continue to rise over the lake this morning before becoming
maximized at 30.1 inches over the western lake by around noon EDT.
Afterwards, the high flattens and moves east towards New England the
rest of today into early Friday morning. While ridging of around
30.0 inches looks to remain over Lake Superior on Thursday, a weak
29.9 to 30.0 inch low could move over the northwestern half of the
lake by Thursday night into Friday morning. As a low around 29.3
inches lifts from far northern Ontario into Hudson Bay Friday night
into Saturday morning, expect troughing of around 29.8 inches to
move into Lake Superior in response by Saturday morning. Troughing
of at least 29.8 inches looks to remain over the lake for the rest
of the day. While weak ridging of 29.8 to 29.9 inches develops over
Lake Superior Sunday morning, a 29.6 inch low moving in from the
west moves over the Upper Great Lakes by Monday morning.



LSZ162-222000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Wed Jul 22 2026 /300 AM CDT Wed Jul 22 2026/

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TODAY...Northwest winds 5 to 15 knots backing southwest in the
afternoon, then increasing to 10 to 20 knots late. Waves building
to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight, then becoming southwest 10 to 20 knots
late. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet, then building to 1 to 3 feet.
.FRIDAY...Southwest winds 15 to 25 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Showers likely and a chance of
thunderstorms after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming northeast
5 to 15 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves calm to 2 feet.

$$

LSZ263-222000-
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 Wed Jul 22 2026

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Northwest winds 5 to 15 knots backing west in the
afternoon, then becoming southwest 10 to 20 knots late. Waves
building to 2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight, then increasing to 10 to 20 knots late.
Waves subsiding to 1 to 3 feet.
.THURSDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A slight chance of thunderstorms
through midnight. A slight chance of showers. Waves subsiding to
1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots veering southwest
after midnight. Showers likely and a chance of thunderstorms
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet.
.SATURDAY...Southwest winds 20 to 30 knots becoming northeast
5 to 15 knots. A chance of showers. Waves subsiding to calm to
2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ264-222000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Wed Jul 22 2026

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves 1 to
3 feet.
.TODAY...Northwest winds 5 to 15 knots backing west in the
afternoon, then increasing to 10 to 20 knots late. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.THURSDAY...Southwest winds 10 to 20 knots. Waves building to
2 to 4 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots. A slight chance
of thunderstorms through midnight. A slight chance of showers.
Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...Southwest winds 10 to 20 knots. Waves building to 3 to
6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. Showers likely and a chance of thunderstorms
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming northeast
5 to 15 knots. A chance of showers. Waves subsiding to calm to
2 feet.
.SUNDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-222000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Wed Jul 22 2026

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Waves 2 to
4 feet.
.TODAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots late. Waves subsiding to calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots increasing to 15 to 25 knots
after midnight. Waves building to 1 to 3 feet.
.THURSDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 1 to 3 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing south by mid
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots becoming southwest
20 to 30 knots after midnight. A chance of showers after
midnight. Waves building to 2 to 4 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering north. A
chance of showers. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots veering southeast. A chance
of showers. Waves calm to 2 feet.

$$

LSZ266-222000-
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 Wed Jul 22 2026

.EARLY THIS MORNING...Northwest winds 20 to 30 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TODAY...Northwest winds 15 to 25 knots backing west late. Waves
subsiding to 2 to 4 feet.
.TONIGHT...West winds 10 to 20 knots increasing to 15 to 25 knots
late. Waves subsiding to 1 to 3 feet.
.THURSDAY...West winds 10 to 20 knots backing southwest in the
afternoon. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. A slight chance of showers and
thunderstorms after midnight. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing south by mid
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming north 5 to
15 knots. Showers. A chance of thunderstorms. Waves subsiding to
calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ267-222000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Wed Jul 22 2026

.EARLY THIS MORNING...Northwest winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...Northwest winds 15 to 25 knots backing west late. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. Waves subsiding to 1 to 3 feet.
.THURSDAY...Southwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. A slight chance of showers after
midnight. Waves building to 1 to 3 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. Waves building to
3 to 5 feet occasionally to 7 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering northwest.
Showers. A chance of showers. Waves subsiding to calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots becoming southeast 5 to
15 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ261-221400-
MAFOR 2209/
Superior West 12710 11610 13520 11510 11610. Waves 2 feet or
less.

Superior North Central 13720 11620 12630 12620. Waves 1 to 3 feet
today. Waves 2 to 4 feet tonight.

Superior South Central 12730 12720 12610 12620. Waves 2 to 4 feet
subsiding to 1 to 3 feet today. Waves 1 to 3 feet tonight.

Superior East 11730 13720 13620 11610. Waves 3 to 5 feet today.
Waves 2 to 4 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