122
FZUS63 KMQT 052001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Wed Aug 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...

High pressure over the Plains is extending 30.0 inch ridging over
the lake this afternoon, which remains through Thursday. For Friday
and into the weekend, pressure over Lake Superior will remain around
29.9 inches between a 30.3 inch Bermuda High and 29.5 inch low
pressure near the western shores of Hudson Bay. On Monday, pressure
over Lake Superior rises slightly to 30.0 inches as the Hudson Bay
low shifts east and ridging builds in from the western provinces of
Canada.



LSZ162-060800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Wed Aug 5 2026 /301 PM CDT Wed Aug 5 2026/

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest late.
Waves calm to 2 feet.
.THURSDAY...Southwest winds 15 to 25 knots backing south late.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Southwest winds 15 to 25 knots. A chance of
showers and a slight chance of thunderstorms after midnight.
Waves building to 2 to 4 feet.
.FRIDAY...Southwest winds 10 to 20 knots. A chance of showers and
a slight chance of thunderstorms. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots backing west after
midnight. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots backing southwest by mid
afternoon. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-060800-
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-
401 PM EDT Wed Aug 5 2026

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest late.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. Waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A slight chance of showers and thunderstorms
after midnight. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of showers through early
afternoon. A slight chance of thunderstorms. Showers likely by
mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots.
Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-060800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Wed Aug 5 2026

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then backing south late. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then veering southwest late. A slight
chance of showers after midnight. Waves subsiding to 1 to 3 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. A chance of showers through early
afternoon. A chance of thunderstorms. Showers likely by mid
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. A chance of showers through midnight. Waves calm to
2 feet.
.SATURDAY...West winds 10 to 20 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-060800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Wed Aug 5 2026

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots backing southeast
late. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots. Waves building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots. Showers likely and a chance
of thunderstorms by mid afternoon. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Showers likely and a chance of
thunderstorms through midnight. Waves calm to 2 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west. Waves calm
to 2 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots.
Waves calm to 2 feet.

$$

LSZ266-060800-
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-
401 PM EDT Wed Aug 5 2026

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then increasing to 10 to 20 knots
late. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.FRIDAY...South winds 10 to 20 knots. Showers likely and a slight
chance of thunderstorms by mid afternoon. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. Showers through midnight. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-060800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Wed Aug 5 2026

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast late.
Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...South winds 10 to 20 knots. A slight chance of showers
by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. Showers through midnight. A chance of thunderstorms. A
chance of showers after midnight. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots veering northwest. Waves calm
to 2 feet.

$$

LSZ261-060200-
MAFOR 0521/
Superior West 12410 11420 13520 12530. Waves 2 feet or less.

Superior North Central 11510 13410 11420 12520 11420. Waves 1 to
2 feet tonight. Waves 1 to 3 feet building to 2 to 4 feet
Thursday.

Superior South Central 11200 11310 11410 12420 12410 11320. Waves
2 feet or less.

Superior East 11700 11500 12400 14410. 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