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(1/2)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/19/2026 4:01 PM America/New_York.
Valid through 8/20/2026 4:00 AM America/New_York.
fzus63 kmqt 192001
glfls
expires:202608200800;;008928
open lake forecast for lake superior
national weather service marquette mi
401 pm edt wed aug 19 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...
30.0 inch high pressure over the canadian prairies and northern
plains moves into the upper great lakes. this high then expands into
the rest of the great lakes by tomorrow as it strengthens to 30.1
inches. friday into the weekend, a low pressure of around 29.8
inches transits across northern ontario, bringing 29.9 inch
troughing over lake superior friday into saturday. this is quickly
followed by 30.1 inch ridging for the latter part of the weekend
into early next week via a 30.2 inch parent high from canada.
lsz162-200800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt wed aug 19 2026 /301 pm cdt wed aug 19 2026/
.late this afternoon...southwest winds 5 to 15 knots. waves calm
to 2 feet.
.tonight...southwest winds 5 to 15 knots becoming northeast less
than 10 knots after midnight, then veering east late. a slight
chance of showers after midnight. waves calm to 2 feet.
.thursday...east winds less than 10 knots increasing to 5 to
15 knots in the afternoon. a chance of showers and thunderstorms.
waves calm to 2 feet.
.thursday night...east winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight, then backing north late. a chance
of showers and a slight chance of thunderstorms through midnight.
waves calm to 2 feet.
.friday...north winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet.
.friday night...west winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves calm to 2 feet.
.saturday...northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. waves calm to 2 feet.
.saturday night...northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. waves calm to 2 feet.
.sunday...north winds 5 to 15 knots veering northeast. waves calm
to 2 feet.
.monday...east winds 5 to 15 knots. a chance of showers. waves
calm to 2 feet.
$$
(2/2)
Latest Great Lakes Marine Forecast by KMQT
Issued 8/19/2026 4:01 PM America/New_York.
Valid through 8/20/2026 4:00 AM America/New_York.
fzus63 kmqt 192001
glfls
expires:202608200800;;008929
open lake forecast for lake superior
national weather service marquette mi
401 pm edt wed aug 19 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...
30.0 inch high pressure over the canadian prairies and northern
plains moves into the upper great lakes. this high then expands into
the rest of the great lakes by tomorrow as it strengthens to 30.1
inches. friday into the weekend, a low pressure of around 29.8
inches transits across northern ontario, bringing 29.9 inch
troughing over lake superior friday into saturday. this is quickly
followed by 30.1 inch ridging for the latter part of the weekend
into early next week via a 30.2 inch parent high from canada.
lsz263-200800-
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 19 2026
.late this afternoon...southwest winds 10 to 20 knots. waves calm
to 2 feet.
.tonight...south winds 5 to 15 knots. waves calm to 2 feet.
.thursday...southwest winds 5 to 15 knots backing southeast in
the afternoon, then backing east late. a chance of showers. a
slight chance of thunderstorms by mid afternoon. waves calm to
2 feet.
.thursday night...southeast winds 5 to 15 knots backing northeast
late. a chance of showers and a slight chance of thunderstorms
through midnight. waves calm to 2 feet.
.friday...north winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet.
.friday night...southwest winds 5 to 15 knots veering west after
midnight. waves calm to 2 feet.
.saturday...northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. waves calm to 2 feet.
.saturday night...north winds 5 to 15 knots increasing to 10 to
20 knots after midnight. waves calm to 2 feet.
.sunday...north winds 10 to 20 knots becoming south 5 to
15 knots. waves calm to 2 feet.
.monday...southeast winds 5 to 15 knots. a chance of showers.
waves calm to 2 feet.
$$
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