640
FZUS63 KMQT 300201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 PM EDT Sat Aug 29 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 develops over the Central and Northern Plains
tonight before lifting north into the Canadian Prairies early next
week. The new 29.4 inch low over the Canadian Prairies on Monday is
projected to bring 29.8 inch troughing over Lake Superior by late
Monday. Weak high pressure ridging of 29.9 inches looks to make a
quick return on Tuesday before being replaced by weak 29.8 inch
troughing Tuesday night and Wednesday morning.



LSZ162-300800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Sat Aug 29 2026 /901 PM CDT Sat Aug 29 2026/

.REST OF TONIGHT...East winds 5 to 15 knots backing northeast
after midnight. Patchy fog after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots increasing to 20 to
30 knots. Patchy fog. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...Northeast winds 20 to 30 knots becoming east
15 to 25 knots after midnight. A slight chance of showers through
midnight. A slight chance of thunderstorms. Showers likely after
midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...East winds 10 to 20 knots becoming north 5 to 15 knots
by mid afternoon. A chance of showers and a slight chance of
thunderstorms through early afternoon. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots veering northeast.
Waves calm to 2 feet.
.THURSDAY...East winds 15 to 25 knots becoming northeast 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ263-300800-
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 PM EDT Sat Aug 29 2026

.REST OF TONIGHT...Southeast winds 5 to 15 knots backing east
late. Patchy fog after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming northeast 15 to
25 knots in the afternoon. Patchy fog. Waves building to 2 to
4 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of showers. A slight chance of
thunderstorms after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...East winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. A chance of showers and a slight
chance of thunderstorms. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.MONDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots veering north. Waves
calm to 2 feet.
.THURSDAY...Northeast winds 10 to 20 knots veering east. Waves
calm to 2 feet.

$$

LSZ264-300800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Sat Aug 29 2026

.REST OF TONIGHT...South winds less than 10 knots backing
southeast after midnight, then becoming east 5 to 15 knots late.
Patchy fog after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Patchy fog. Waves calm to
2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots late. A chance of showers and a slight chance of
thunderstorms after midnight. Waves building to 1 to 3 feet.
.MONDAY...Southeast winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Showers likely through early
afternoon. A chance of thunderstorms. A chance of showers by mid
afternoon. Waves building to 2 to 4 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. A slight chance of
showers through midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds less than 10 knots veering north.
Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east. Waves
calm to 2 feet.

$$

LSZ265-300800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Sat Aug 29 2026

.REST OF TONIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then backing southeast late. Patchy fog
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
late. Patchy fog. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots veering southeast late.
A chance of showers and a slight chance of thunderstorms after
midnight. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.MONDAY...Southeast winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Showers likely through early
afternoon. A slight chance of thunderstorms. A chance of showers
by mid afternoon. Waves building to 2 to 4 feet, then subsiding
to 1 to 3 feet.
.MONDAY NIGHT...South winds 10 to 20 knots veering west after
midnight. A slight chance of showers through midnight. Waves
subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots backing southeast by
mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. Waves calm to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ266-300800-
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 PM EDT Sat Aug 29 2026

.REST OF TONIGHT...South winds 5 to 15 knots backing southeast
late. A slight chance of showers by midnight. Patchy fog. Waves
calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots. Patchy fog. Waves calm to
2 feet.
.SUNDAY NIGHT...East winds 10 to 20 knots. A chance of showers
after midnight. Waves building to 1 to 3 feet.
.MONDAY...Southeast winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Showers likely and a slight chance of
thunderstorms. Waves building to 2 to 4 feet.
.MONDAY NIGHT...South winds 10 to 20 knots becoming west 5 to
15 knots after midnight. A slight chance of showers through
midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering east. Waves calm to
2 feet.

$$

LSZ267-300800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Sat Aug 29 2026

.REST OF TONIGHT...Southwest winds 10 to 20 knots backing south
after midnight, then becoming southeast 5 to 15 knots late. A
slight chance of showers by midnight. Patchy fog. Waves calm to
2 feet.
.SUNDAY...East winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Patchy fog through early afternoon. Waves calm
to 2 feet.
.SUNDAY NIGHT...East winds 10 to 20 knots increasing to 15 to
25 knots late. A chance of showers after midnight. Waves building
to 1 to 3 feet.
.MONDAY...Southeast winds 15 to 25 knots. Showers and a chance of
thunderstorms. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. A chance of showers. Waves
subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering northeast. Waves
calm to 2 feet.

$$

LSZ261-300800-
MAFOR 3003/
Superior West 11200 11210 11110 11120 12130 11140 11240. Waves 1
foot or less overnight. Waves 2 feet or less building to 2 to 4
feet Sunday. Waves 2 to 4 feet Sunday evening.

Superior North Central 11400 11300 11200 14210 11210. Waves 2
feet or less.

Superior South Central 12410 12310 14220. Waves 2 feet or less.

Superior East 12400 11300 11200 14210. 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