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(1/2)
Latest Great Lakes Marine Forecast by KMQT
Issued 10/20/2026 4:00 AM America/New_York.
Valid through 10/20/2026 4:00 PM America/New_York.
fzus63 kmqt 200800
glfls
expires:202610202000;;874287
open lake forecast for lake superior
national weather service marquette mi
400 am edt tue oct 20 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 30.4 inch high over lake superior and northeastern ontario shifts
east today. this high builds to 30.5 inches over western quebec this
afternoon as a 29.9 inch low moves from northern manitoba into
western hudson bay. wednesday morning, the high weakens slightly to
30.4 inches but expands over much of southern quebec while the low
deepens to 29.7 inches over eastern hudson bay. meanwhile, a 30.3
inch high moves over the north dakota/manitoba/saskatchewan
tripoint. with the low moving across northern quebec, the highs
merge into a 30.3 inch high over the upper great lakes by thursday
morning. by friday afternoon, the high builds to 30.5 inches over
the ontario/quebec line as a 29.4 inch low moves into eastern
montana. saturday afternoon, the high builds further to 30.6 inches
over new england as the 29.4 inch low approaches lake winnipeg.
lsz162-202000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt tue oct 20 2026 /300 am cdt tue oct 20 2026/
.early this morning...east winds 5 to 15 knots. waves calm to
2 feet.
.today...southeast winds 5 to 15 knots backing east late. waves
calm to 2 feet.
.tonight...south winds 5 to 15 knots veering southwest after
midnight. waves calm to 2 feet.
.wednesday...southwest winds 5 to 15 knots veering west late.
waves calm to 2 feet.
.wednesday night...northeast winds less than 10 knots increasing
to 5 to 15 knots after midnight. waves calm to 2 feet.
.thursday...east winds 5 to 15 knots. waves calm to 2 feet.
.thursday night...east winds 5 to 15 knots. waves calm to 2 feet.
.friday...east winds 5 to 15 knots becoming south 15 to 25 knots.
waves building to 2 to 4 feet.
.saturday...south winds 15 to 25 knots becoming southwest 20 to
30 knots. a chance of showers. waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
$$
(2/2)
Latest Great Lakes Marine Forecast by KMQT
Issued 10/20/2026 4:00 AM America/New_York.
Valid through 10/20/2026 4:00 PM America/New_York.
fzus63 kmqt 200800
glfls
expires:202610202000;;874288
open lake forecast for lake superior
national weather service marquette mi
400 am edt tue oct 20 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 30.4 inch high over lake superior and northeastern ontario shifts
east today. this high builds to 30.5 inches over western quebec this
afternoon as a 29.9 inch low moves from northern manitoba into
western hudson bay. wednesday morning, the high weakens slightly to
30.4 inches but expands over much of southern quebec while the low
deepens to 29.7 inches over eastern hudson bay. meanwhile, a 30.3
inch high moves over the north dakota/manitoba/saskatchewan
tripoint. with the low moving across northern quebec, the highs
merge into a 30.3 inch high over the upper great lakes by thursday
morning. by friday afternoon, the high builds to 30.5 inches over
the ontario/quebec line as a 29.4 inch low moves into eastern
montana. saturday afternoon, the high builds further to 30.6 inches
over new england as the 29.4 inch low approaches lake winnipeg.
lsz263-202000-
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-
400 am edt tue oct 20 2026
.early this morning...southeast winds 5 to 15 knots. waves calm
to 2 feet.
.today...southeast winds 5 to 15 knots backing east late. waves
calm to 2 feet.
.tonight...south winds 10 to 20 knots veering southwest after
midnight. waves building to 1 to 3 feet.
.wednesday...southwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. waves subsiding to calm to 2 feet.
.wednesday night...northeast winds less than 10 knots becoming
east 5 to 15 knots after midnight. waves calm to 2 feet.
.thursday...east winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. waves calm to 2 feet.
.thursday night...east winds 5 to 15 knots veering south after
midnight. waves calm to 2 feet.
.friday...south winds 5 to 15 knots increasing to 15 to 25 knots.
waves building to 2 to 4 feet.
.saturday...south winds 20 to 30 knots veering southwest. waves
building to 3 to 6 feet occasionally to 8 feet.
$$
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