180
FZUS63 KMQT 071401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Fri Aug 7 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 passing cold front brings 29.8 inch troughing across the lake
today and tonight before 29.9 inch ridging returns Saturday. While
some weak 29.8 inch troughing could be seen over Lake Superior
Saturday night, weak 29.9 inch ridging settles once again over the
lake Sunday and Monday. A weak 29.8 inch trough potentially passes
through Sunday evening. The high pressure ridging could increase to
30.0 inches by Tuesday.



LSZ162-072000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Fri Aug 7 2026 /901 AM CDT Fri Aug 7 2026/

.REST OF TODAY...Southwest winds 10 to 20 knots. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.TONIGHT...West winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight, then becoming west 10 to 20 knots late.
Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots backing southwest in the
afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. A slight chance of
thunderstorms through midnight. A chance of showers. Waves
subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ263-072000-
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 Aug 7 2026

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

$$

LSZ264-072000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Fri Aug 7 2026

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

$$

LSZ265-072000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Fri Aug 7 2026

.REST OF TODAY...South winds 10 to 20 knots veering west late.
Showers likely and a chance of thunderstorms by mid afternoon.
Waves calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight, then becoming northwest 15 to 25 knots late. A slight
chance of showers and thunderstorms through midnight. Waves calm
to 2 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots. A chance of
showers and a slight chance of thunderstorms after midnight.
Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots becoming east 5 to 15 knots
by mid afternoon. A slight chance of showers. Waves calm to
2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing south. Waves calm to
2 feet.

$$

LSZ266-072000-
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 Aug 7 2026

.REST OF TODAY...South winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. A chance of showers and thunderstorms
by mid afternoon. Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering northwest late.
Showers likely and a chance of thunderstorms through midnight,
then a slight chance of showers after midnight. Waves calm to
2 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing west in the
afternoon, then diminishing to 5 to 15 knots late. Waves calm to
2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A chance of showers and a slight
chance of thunderstorms after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. A slight chance of showers. Waves calm to
2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ267-072000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Fri Aug 7 2026

.REST OF TODAY...South winds 10 to 20 knots. A slight chance of
showers and thunderstorms by mid afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight, then veering northwest late. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing west in the
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A slight chance of showers after
midnight. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. A slight chance of showers. Waves calm to
2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ261-072000-
MAFOR 0715/
Superior West 11510 11610 11510 11610 12710 12610. A chance of
showers this afternoon and evening. Waves 2 feet or less.

Superior North Central 11520 11510 11506 11500 11600 11700 11710
11610. A chance of thunderstorms this afternoon and evening.
Waves 1 to 3 feet.

Superior South Central 11420 11310 11616 11416 11520 11620 11720
11730. A chance of thunderstorms this afternoon and evening.
Waves 2 feet or less.

Superior East 11420 12410 11416 11516 11600 12710. A chance of
thunderstorms this evening. Waves 1 to 3 feet.

$$

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