fzus63 kmqt 132001
glfls 
expires:202603140800;;618743

open lake forecast for lake superior
national weather service marquette mi
400 pm edt fri mar 13 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 weakening 29.3 inch low moving over lake huron this evening 
continues into southern ontario tonight at 29.4 inches before moving 
over new england at 29.6 inches by saturday morning. a 30.2 inch 
ridge then extends over lake superior from central canada saturday. 
following the ridge, a 29.2 inch low developing over the central 
plains saturday night tracks through lower michigan at 29.0 inches 
sunday night and monday morning before lifting into canada monday 
evening. high pressure of around 30.4 inches then overspreads the 
northern plains on monday and moves into lake superior at 30.1 
inches by tuesday. a weakening clipper low around 29.8 inches then 
moves over northern ontario late wednesday.



lsz162-140800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt fri mar 13 2026 /300 pm cdt fri mar 13 2026/

...gale watch in effect from sunday morning through late monday
night...

.late this afternoon...north winds 15 to 25 knots. a slight
chance of snow showers. waves 5 to 8 feet occasionally to 10 feet
subsiding to 3 to 6 feet occasionally to 8 feet. 
.tonight...north winds 10 to 20 knots becoming northwest 5 to
15 knots late. waves subsiding to calm to 2 feet. 
.saturday...west winds 5 to 15 knots backing south late. waves
calm to 2 feet. 
.saturday night...east winds 10 to 20 knots increasing to
30 knots with a few gale force gusts to 35 knots possible late. a
chance of snow. waves building to 4 to 7 feet occasionally to
9 feet. 
.sunday...northeast gales to 45 knots. snow likely. freezing
spray by mid afternoon. waves building to 12 to 17 feet
occasionally to 21 feet. 
.sunday night...north gales to 45 knots. heavy freezing spray. a
chance of snow. waves 12 to 17 feet occasionally to 21 feet. 
.monday...north gales to 45 knots. heavy freezing spray. waves
subsiding to 8 to 11 feet occasionally to 14 feet. 
.monday night...north gales to 40 knots diminishing to 20 to
30 knots after midnight. heavy freezing spray through midnight.
waves subsiding to 3 to 5 feet occasionally to 7 feet. 
.tuesday...southwest winds 15 to 25 knots becoming south 10 to
20 knots. a chance of snow showers. waves subsiding to calm to
2 feet, then building to 3 to 5 feet occasionally to 7 feet. 
.wednesday...southwest winds 10 to 20 knots veering west. waves
subsiding to calm to 2 feet. 

$$

fzus63 kmqt 132001
glfls 
expires:202603140800;;618744

open lake forecast for lake superior
national weather service marquette mi
400 pm edt fri mar 13 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 weakening 29.3 inch low moving over lake huron this evening 
continues into southern ontario tonight at 29.4 inches before moving 
over new england at 29.6 inches by saturday morning. a 30.2 inch 
ridge then extends over lake superior from central canada saturday. 
following the ridge, a 29.2 inch low developing over the central 
plains saturday night tracks through lower michigan at 29.0 inches 
sunday night and monday morning before lifting into canada monday 
evening. high pressure of around 30.4 inches then overspreads the 
northern plains on monday and moves into lake superior at 30.1 
inches by tuesday. a weakening clipper low around 29.8 inches then 
moves over northern ontario late wednesday.



lsz263-140800-
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 fri mar 13 2026

...gale watch in effect from sunday morning through sunday
evening...
...storm watch in effect from sunday evening through monday
evening...

.late this afternoon...north winds 15 to 25 knots. a chance of
snow showers. waves 5 to 9 feet occasionally to 11 feet. 
.tonight...north winds 15 to 25 knots diminishing to 5 to
15 knots. waves subsiding to 1 to 3 feet. 
.saturday...west winds 5 to 15 knots backing southwest in the
afternoon. waves subsiding to calm to 2 feet. 
.saturday night...southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight, then becoming east 20 to 30 knots
late. a chance of snow. waves building to 3 to 5 feet
occasionally to 7 feet. 
.sunday...northeast gales to 45 knots. freezing spray. snow
likely. waves building to 12 to 17 feet occasionally to 21 feet. 
.sunday night...north gales to 45 knots increasing to storm force
winds to 55 knots after midnight. heavy freezing spray. snow
likely through midnight. a chance of snow after midnight. waves
building to 15 to 20 feet occasionally to 25 feet. 
.monday...north storm force winds to 60 knots. heavy freezing
spray. a chance of snow. waves building to 17 to 22 feet
occasionally to 28 feet, then subsiding to 15 to 20 feet
occasionally to 25 feet. 
.monday night...north gales to 45 knots. heavy freezing spray.
waves subsiding to 7 to 10 feet occasionally to 13 feet. 
.tuesday...northwest winds 20 to 30 knots becoming south 15 to
25 knots. a chance of snow showers. waves subsiding to calm to
2 feet, then building to 3 to 6 feet occasionally to 8 feet. 
.wednesday...southwest winds 15 to 25 knots becoming west 10 to
20 knots. waves subsiding to 1 to 3 feet, then building to 3 to
5 feet occasionally to 7 feet. 

$$