fzus63 kmqt 052001
glfls 
expires:202604060800;;888145

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sun apr 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 weak 30.0 inch trough passes over the lake tonight into monday. 
monday afternoon, 30.6 inch high pressure resides over north dakota 
before moving over the upper great lakes tuesday morning at 30.5 
inches. the high builds back to 30.6 inches over the lower great 
lakes tuesday night as a 29.5 inch low organizes along the 
montana/saskatchewan border. this low moves over the northwest angle 
wednesday night before moving north of the lake through thursday 
morning. high pressure of 30.4 inches then moves over the upper 
great lakes friday.



lsz162-060800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt sun apr 5 2026 /300 pm cdt sun apr 5 2026/

.late this afternoon...west winds 10 to 20 knots. a chance of
rain showers, possibly mixed with snow. waves calm to 2 feet. 
.tonight...west winds 10 to 20 knots veering northwest after
midnight, then becoming north 15 to 25 knots late. a chance of
snow showers, possibly mixed with rain. waves building to 2 to
4 feet. 
.monday...north winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon, then backing northwest late. a slight
chance of snow showers through early afternoon. waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet. 
.monday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.tuesday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.tuesday night...southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. a chance of snow showers after
midnight. waves building to 2 to 4 feet. 
.wednesday...southeast winds 15 to 25 knots becoming east 10 to
20 knots by mid afternoon. snow showers likely through early
afternoon. rain showers. waves building to 3 to 5 feet
occasionally to 7 feet. 
.wednesday night...southwest winds 10 to 20 knots increasing to
20 to 30 knots after midnight. a chance of rain showers. waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet. 
.thursday...west winds 20 to 30 knots diminishing to 5 to
15 knots. waves subsiding to calm to 2 feet. 
.friday...southwest winds 5 to 15 knots backing south. waves calm
to 2 feet. 

$$

fzus63 kmqt 052001
glfls 
expires:202604060800;;888146

open lake forecast for lake superior
national weather service marquette mi
400 pm edt sun apr 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 weak 30.0 inch trough passes over the lake tonight into monday. 
monday afternoon, 30.6 inch high pressure resides over north dakota 
before moving over the upper great lakes tuesday morning at 30.5 
inches. the high builds back to 30.6 inches over the lower great 
lakes tuesday night as a 29.5 inch low organizes along the 
montana/saskatchewan border. this low moves over the northwest angle 
wednesday night before moving north of the lake through thursday 
morning. high pressure of 30.4 inches then moves over the upper 
great lakes friday.



lsz263-060800-
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 pm edt sun apr 5 2026

.late this afternoon...west winds 5 to 15 knots. a slight chance
of rain and snow showers. waves 2 to 4 feet subsiding to 1 to
3 feet. 
.tonight...northwest winds 5 to 15 knots becoming north 10 to
20 knots after midnight, then increasing to 20 to 30 knots late.
a slight chance of rain showers through midnight. a chance of
snow showers. waves subsiding to calm to 2 feet, then building to
3 to 5 feet occasionally to 7 feet. 
.monday...north winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon, then becoming northwest 10 to 20 knots
late. freezing spray through early afternoon. a chance of snow
showers. waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 2 to 4 feet. 
.monday night...northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. waves subsiding to calm to 2 feet. 
.tuesday...west winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. waves building to 2 to 4 feet. 
.tuesday night...south winds 10 to 20 knots. waves subsiding to
1 to 3 feet, then building to 2 to 4 feet. 
.wednesday...southeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. snow showers likely through early
afternoon. rain showers. waves building to 4 to 7 feet
occasionally to 9 feet. 
.wednesday night...south winds 15 to 25 knots becoming southwest
20 to 30 knots after midnight. rain showers likely through
midnight. waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet. 
.thursday...west winds 20 to 30 knots diminishing to 5 to
15 knots. waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to calm to 2 feet. 
.friday...west winds 5 to 15 knots backing south. waves building
to 1 to 3 feet. 

$$