fzus63 kmqt 271402
glfls 
expires:202604272000;;613257

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon apr 27 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 29.5 inch low over the central plains moves northeast today 
reaching the upper peninsula late this evening and crosses the lake 
at 29.4 inches by early tuesday morning. the low reaches james bay 
tuesday afternoon while 30.1 inch high pressure builds over the 
canadian prairie. as the low departs northeast, the high builds to 
30.2 inches while a 29.8 inch low passes south of the lower great 
lakes wednesday. by thursday night, the 30.2 inch high will span 
from hudson bay to the central plains while low pressure of 29.5 
inches will be off cape cod. the high then shifts directly over lake 
superior by saturday ahead of the arrival of a weak trough late 
saturday into sunday.



lsz162-272000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 am edt mon apr 27 2026 /901 am cdt mon apr 27 2026/

.rest of today...northeast winds 15 to 25 knots. rain showers and
a slight chance of thunderstorms. waves 3 to 6 feet occasionally
to 8 feet. 
.tonight...northeast winds 10 to 20 knots becoming west 15 to
25 knots after midnight, then increasing to 20 to 30 knots late.
a chance of rain showers. waves subsiding to 1 to 3 feet, then
building to 3 to 6 feet occasionally to 8 feet. 
.tuesday...west winds 20 to 30 knots diminishing to 10 to
20 knots late. waves subsiding to 1 to 3 feet. 
.tuesday night...northwest winds 5 to 15 knots. waves subsiding
to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...northeast winds 5 to 15 knots backing north. waves
calm to 2 feet. 
.friday...southeast winds 5 to 15 knots veering northwest. waves
calm to 2 feet. 

$$

fzus63 kmqt 271402
glfls 
expires:202604272000;;613258

open lake forecast for lake superior
national weather service marquette mi
1001 am edt mon apr 27 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 29.5 inch low over the central plains moves northeast today 
reaching the upper peninsula late this evening and crosses the lake 
at 29.4 inches by early tuesday morning. the low reaches james bay 
tuesday afternoon while 30.1 inch high pressure builds over the 
canadian prairie. as the low departs northeast, the high builds to 
30.2 inches while a 29.8 inch low passes south of the lower great 
lakes wednesday. by thursday night, the 30.2 inch high will span 
from hudson bay to the central plains while low pressure of 29.5 
inches will be off cape cod. the high then shifts directly over lake 
superior by saturday ahead of the arrival of a weak trough late 
saturday into sunday.



lsz263-272000-
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 edt mon apr 27 2026

.rest of today...east winds 15 to 25 knots. a chance of rain
showers by late morning. a slight chance of thunderstorms. rain
showers by mid afternoon. waves 2 to 4 feet building to 3 to
6 feet occasionally to 8 feet. 
.tonight...southeast winds 15 to 25 knots becoming west 10 to
20 knots after midnight, then increasing to 20 to 30 knots late.
rain showers likely through midnight, then a chance of rain
showers after midnight. waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.tuesday...west winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. a slight chance of rain showers
through early afternoon. waves subsiding to 3 to 5 feet
occasionally to 7 feet. 
.tuesday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.wednesday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.wednesday night...north winds 5 to 15 knots. waves calm to
2 feet. 
.thursday...north winds 5 to 15 knots backing northwest. waves
calm to 2 feet. 
.friday...north winds 5 to 15 knots backing west. waves calm to
2 feet. 

$$