fzus63 kmqt 051501
glfls 
expires:202603052100;;671587

open lake forecast for lake superior
national weather service marquette mi
1001 am est thu mar 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...

a 30.7 inch high over james bay and quebec this morning moves east 
today, allowing 30.3 inch high pressure over lake superior this 
morning to fall to 30.0 inches by friday morning ahead of a 29.5 
inch low developing over kansas and nebraska. this low tracks 
northeast to upper michigan and lake superior at 29.5 inches by 
saturday morning. weak 29.8 ridging builds over the lake on saturday 
evening as the low quickly departs into quebec. 29.5 inch troughing 
returns to the lake on sunday as a 29.1 inch low tracks across 
northern ontario. this will be closely followed by a 29.3 inch 
clipper low crossing the lake monday morning. by tuesday morning, 
the lake will be between 30.3 inch high pressure over northern 
ontario and 29.6 inch low pressure over the upper mississippi river 
valley.



lsz162-052100-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am est thu mar 5 2026 /901 am cst thu mar 5 2026/

...dense fog advisory in effect until 1 pm est /noon cst/ this
afternoon...

.rest of today...northeast winds 15 to 25 knots. a slight chance
of freezing drizzle and snow showers late in the morning. areas
of dense freezing fog late in the morning. areas of dense fog.
waves 3 to 6 feet occasionally to 8 feet. 
.tonight...east winds 10 to 20 knots diminishing to 5 to 15 knots
by midnight. patchy fog. a slight chance of drizzle and freezing
drizzle after midnight. waves subsiding to 1 to 3 feet. 
.friday...east winds 5 to 15 knots backing northeast by mid
afternoon. patchy fog in the morning. a chance of drizzle in the
morning. rain showers likely. waves subsiding to calm to 2 feet. 
.friday night...north winds 5 to 15 knots increasing to 10 to
20 knots after midnight. rain showers likely. a slight chance of
snow showers after midnight. waves calm to 2 feet. 
.saturday...northwest winds 15 to 25 knots backing west in the
afternoon. a slight chance of rain and snow showers in the
morning. waves building to 1 to 3 feet. 
.saturday night...southwest winds 20 to 30 knots increasing to
gales to 40 knots after midnight. waves building to 5 to 8 feet
occasionally to 10 feet. 
.sunday...southwest gales to 35 knots diminishing to 15 to
25 knots. waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to 2 to 4 feet. 
.monday...west winds 10 to 20 knots becoming northeast 15 to
25 knots. waves subsiding to calm to 2 feet, then building to
3 to 5 feet occasionally to 7 feet. 

$$

fzus63 kmqt 051501
glfls 
expires:202603052100;;671588

open lake forecast for lake superior
national weather service marquette mi
1001 am est thu mar 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...

a 30.7 inch high over james bay and quebec this morning moves east 
today, allowing 30.3 inch high pressure over lake superior this 
morning to fall to 30.0 inches by friday morning ahead of a 29.5 
inch low developing over kansas and nebraska. this low tracks 
northeast to upper michigan and lake superior at 29.5 inches by 
saturday morning. weak 29.8 ridging builds over the lake on saturday 
evening as the low quickly departs into quebec. 29.5 inch troughing 
returns to the lake on sunday as a 29.1 inch low tracks across 
northern ontario. this will be closely followed by a 29.3 inch 
clipper low crossing the lake monday morning. by tuesday morning, 
the lake will be between 30.3 inch high pressure over northern 
ontario and 29.6 inch low pressure over the upper mississippi river 
valley.



lsz263-052100-
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 am est thu mar 5 2026

...dense fog advisory in effect until 1 pm est this afternoon...

.rest of today...east winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. a slight chance of freezing drizzle
and snow showers late in the morning. areas of dense freezing fog
late in the morning. patchy dense fog. waves 3 to 6 feet
occasionally to 8 feet. 
.tonight...east winds 10 to 20 knots becoming southeast 5 to
15 knots by midnight. patchy fog. waves subsiding to 1 to 3 feet.
.friday...southeast winds 5 to 15 knots backing east by mid
afternoon. patchy fog in the morning. a chance of rain showers
and a slight chance of drizzle in the morning, then rain showers
likely in the afternoon. waves subsiding to calm to 2 feet. 
.friday night...north winds 5 to 15 knots increasing to 15 to
25 knots after midnight. a chance of rain showers in the evening,
then rain showers likely, possibly mixed with snow showers after
midnight. waves building to 1 to 3 feet. 
.saturday...northwest winds 15 to 25 knots backing west in the
afternoon. a chance of snow showers, possibly mixed with rain in
the morning. waves building to 2 to 4 feet. 
.saturday night...southwest winds 20 to 30 knots increasing to
gales to 40 knots after midnight. waves building to 7 to 10 feet
occasionally to 13 feet. 
.sunday...southwest gales to 40 knots diminishing to 20 to
30 knots. waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.monday...west winds 15 to 25 knots veering northeast. waves
subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet. 

$$