784
FZUS63 KMQT 130801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Thu Aug 13 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...

Weak 29.9 inch ridging over Lake Superior holds through this morning
as a 30.2 inch high is developing over the Canadian Rockies. This
high eventually becomes centered over the lake at 30.2 inches Friday
afternoon. A 29.9 inch trough then moves over the western end of the
lake Saturday afternoon as the 30.2 inch high moves over the Lower
Great Lakes. This trough consolidates to a 29.8 inch low as it
passes over Lake Superior, reaching the Ontario/Quebec line by
Sunday evening. Sunday night into Monday, a 30.1 inch high over the
Plains will weaken to 30.0 inches as it slides south of Lake
Superior. By Tuesday, this high will be fully south of the Great
Lakes as a 29.4 inch low over Hudson Bay extends a 29.8 inch trough
over Lake Superior.



LSZ162-132000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Thu Aug 13 2026 /301 AM CDT Thu Aug 13 2026/

.EARLY THIS MORNING...North winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...Northeast winds 5 to 15 knots veering east late. A
slight chance of showers through early afternoon. Waves calm to
2 feet.
.TONIGHT...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots increasing to 15 to
25 knots in the afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...Northeast winds 15 to 25 knots becoming east 5 to
15 knots after midnight. A chance of showers after midnight.
Waves subsiding to calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots backing northeast by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots backing northwest
after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ263-132000-
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 AM EDT Thu Aug 13 2026

.EARLY THIS MORNING...Northwest winds less than 10 knots. Waves
calm to 2 feet.
.TODAY...North winds less than 10 knots becoming northeast 5 to
15 knots in the afternoon, then veering east late. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots diminishing to less than
10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots becoming northeast 15 to
25 knots in the afternoon, then veering east late. Waves building
to 1 to 3 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots becoming southeast 5 to
15 knots after midnight. A slight chance of showers after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. A chance of showers. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ264-132000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Thu Aug 13 2026

.EARLY THIS MORNING...Northwest winds less than 10 knots. Waves
calm to 2 feet.
.TODAY...Northwest winds less than 10 knots backing southwest
late. Waves calm to 2 feet.
.TONIGHT...West winds less than 10 knots veering north after
midnight, then veering northeast late. Waves calm to 2 feet.
.FRIDAY...Northeast winds less than 10 knots becoming east 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. A chance of showers. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-132000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Thu Aug 13 2026

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Northwest winds 5 to 15 knots veering northeast late.
Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots backing east late. Waves
calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of showers. Waves building to
1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering west after
midnight. A chance of showers. Waves subsiding to calm to 2 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.MONDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ266-132000-
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 AM EDT Thu Aug 13 2026

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering north late. Waves
calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering west after
midnight. A chance of showers through midnight. Showers likely
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ267-132000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Thu Aug 13 2026

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering north late.
Waves calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing northwest late. Waves
calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Showers likely. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ261-131400-
MAFOR 1309/
Superior West 11800 12100 13200 12100. Waves 1 foot or less.

Superior North Central 14700 11500 11600 11700 11100. Waves 1
foot or less.

Superior South Central 13700 11800 11100 12500 11100. Waves 1
foot or less.

Superior East 11600 15700 11700. Waves 1 foot 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