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(1/2)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/12/2026 10:01 PM America/New_York.
Valid through 8/13/2026 4:00 AM America/New_York.
fzus63 kmqt 130201
glfls
expires:202608130800;;089300
open lake forecast for lake superior
national weather service marquette mi
1001 pm edt wed aug 12 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 tomorrow
morning, leading to calm open lake conditions. tomorrow morning, a
30.2 inch high over the canadian rockies begins to extend stronger
ridging over lake superior before eventually becoming 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 ontario by sunday afternoon, with 30.1 inch ridging over
lake superior to follow.
lsz162-130800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt wed aug 12 2026 /901 pm cdt wed aug 12 2026/
.rest of tonight...north winds 5 to 15 knots. patchy fog after
midnight. a slight chance of showers after midnight. waves calm
to 2 feet.
.thursday...northeast winds 5 to 15 knots veering east in the
afternoon. a slight chance of showers through early afternoon.
waves calm to 2 feet.
.thursday night...northeast winds 5 to 15 knots. waves calm to
2 feet.
.friday...northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. waves building to 1 to 3 feet.
.friday night...northeast winds 15 to 25 knots diminishing to
5 to 15 knots 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. a chance of showers. waves calm to 2 feet.
.sunday...west winds 5 to 15 knots veering northwest. waves calm
to 2 feet.
.monday...southwest winds 5 to 15 knots veering west. waves calm
to 2 feet.
$$
(2/2)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/12/2026 10:01 PM America/New_York.
Valid through 8/13/2026 4:00 AM America/New_York.
fzus63 kmqt 130201
glfls
expires:202608130800;;089301
open lake forecast for lake superior
national weather service marquette mi
1001 pm edt wed aug 12 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 tomorrow
morning, leading to calm open lake conditions. tomorrow morning, a
30.2 inch high over the canadian rockies begins to extend stronger
ridging over lake superior before eventually becoming 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 ontario by sunday afternoon, with 30.1 inch ridging over
lake superior to follow.
lsz263-130800-
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 wed aug 12 2026
.rest of tonight...west winds less than 10 knots veering north
after midnight. waves calm to 2 feet.
.thursday...north winds less than 10 knots becoming northeast
5 to 15 knots in the afternoon, then veering east late. a slight
chance of showers through early afternoon. waves calm to 2 feet.
.thursday night...northeast winds less than 10 knots increasing
to 5 to 15 knots late. waves calm to 2 feet.
.friday...northeast winds 5 to 15 knots increasing to 15 to
25 knots by mid afternoon. waves calm to 2 feet.
.friday night...east winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. waves calm to 2 feet.
.saturday...east winds 5 to 15 knots. waves calm to 2 feet.
.saturday night...northeast winds 5 to 15 knots backing 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...west winds 10 to 20 knots backing southwest. waves calm
to 2 feet.
$$
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