fzus63 kmqt 050801
glfls 
expires:202604052000;;861848

open lake forecast for lake superior
national weather service marquette mi
401 am 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 29.5 inch low over the ontario/quebec line further deepens to 29.3 
inches over central quebec this afternoon. a weak 30.1 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.



lsz162-052000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt sun apr 5 2026 /301 am cdt sun apr 5 2026/

.early this morning...northwest winds 20 to 30 knots. waves 3 to
6 feet occasionally to 8 feet. 
.today...northwest winds 10 to 20 knots backing west in the
afternoon. a slight chance of rain and snow showers by mid
afternoon. waves subsiding to 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. 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 becoming south
10 to 20 knots after midnight. a chance of snow showers. waves
building to 1 to 3 feet. 
.wednesday...southeast winds 15 to 25 knots veering west. rain
showers, possibly mixed with snow, then a chance of rain showers.
waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet. 
.thursday...west winds 15 to 25 knots becoming north 5 to
15 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 050801
glfls 
expires:202604052000;;861849

open lake forecast for lake superior
national weather service marquette mi
401 am 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 29.5 inch low over the ontario/quebec line further deepens to 29.3 
inches over central quebec this afternoon. a weak 30.1 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.



lsz263-052000-
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 am edt sun apr 5 2026

.early this morning...northwest winds 20 to 30 knots. waves 4 to
8 feet occasionally to 10 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet. 
.today...northwest winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. a slight chance of rain and snow showers by mid afternoon.
waves subsiding to 1 to 3 feet. 
.tonight...west winds 5 to 15 knots becoming north 10 to 20 knots
after midnight, then increasing to 15 to 25 knots late. a chance
of snow showers, possibly mixed with rain. waves subsiding to
calm to 2 feet, then building to 3 to 5 feet occasionally to
7 feet. 
.monday...north winds 15 to 25 knots diminishing to 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 becoming west 20 to
30 knots. rain showers, possibly mixed with snow. 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 becoming north 10 to
20 knots. waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to calm to 2 feet. 

$$