fzus63 kmqt 120800
glfls 
expires:202603122000;;063649

open lake forecast for lake superior
national weather service marquette mi
400 am edt thu mar 12 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...

transient high pressure of 30.1 inches will cross the lake this 
morning into the afternoon as 29.3 inch low pressure exits eastward 
over the gulf of saint lawrence and another 29.3 inch low moves over 
north dakota. the dakotas low deepens to 29.1 inches in the vicinity 
of northern lake michigan friday morning, then moves over new 
england at 29.5 inches by saturday morning. a 30.2 inch ridge will 
extend over lake superior from central canada on saturday afternoon. 
a 29.3 inch low developing over the central plains saturday night 
will track to near lake huron at 28.9 inches by monday morning. high 
pressure of 30.4 inches will overspread the northern plains on 
monday and move to lake superior by tuesday as the low departs into 
northern quebec.



lsz162-122000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 am edt thu mar 12 2026 /300 am cdt thu mar 12 2026/

...gale warning in effect from this evening through friday
morning...

.early this morning...northwest winds 5 to 15 knots. waves calm
to 2 feet. 
.today...northwest winds 5 to 15 knots backing southeast in the
afternoon, then becoming east 15 to 25 knots late. a chance of
snow by mid afternoon. waves building to 2 to 4 feet. 
.tonight...east gales to 40 knots backing northeast late. snow
through midnight, then snow likely after midnight. freezing spray
after midnight. waves building to 11 to 15 feet occasionally to
19 feet. 
.friday...north gales to 35 knots diminishing to 20 to 30 knots
in the afternoon, then becoming northwest 15 to 25 knots late.
freezing spray through early afternoon. a chance of snow showers
through early afternoon. waves subsiding to 4 to 7 feet
occasionally to 9 feet. 
.friday night...northwest winds 5 to 15 knots veering north after
midnight. waves subsiding to calm to 2 feet. 
.saturday...southwest winds 5 to 15 knots. waves calm to 2 feet. 
.saturday night...east winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. waves building to 2 to 4 feet. 
.sunday...northeast gales to 35 knots becoming north gales to
40 knots. heavy freezing spray. a chance of snow showers. waves
building to 11 to 15 feet occasionally to 19 feet. 
.monday...north gales to 40 knots becoming northwest 20 to
30 knots. heavy freezing spray. waves subsiding to 1 to 3 feet. 

$$

fzus63 kmqt 120800
glfls 
expires:202603122000;;063650

open lake forecast for lake superior
national weather service marquette mi
400 am edt thu mar 12 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...

transient high pressure of 30.1 inches will cross the lake this 
morning into the afternoon as 29.3 inch low pressure exits eastward 
over the gulf of saint lawrence and another 29.3 inch low moves over 
north dakota. the dakotas low deepens to 29.1 inches in the vicinity 
of northern lake michigan friday morning, then moves over new 
england at 29.5 inches by saturday morning. a 30.2 inch ridge will 
extend over lake superior from central canada on saturday afternoon. 
a 29.3 inch low developing over the central plains saturday night 
will track to near lake huron at 28.9 inches by monday morning. high 
pressure of 30.4 inches will overspread the northern plains on 
monday and move to lake superior by tuesday as the low departs into 
northern quebec.



lsz263-122000-
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 am edt thu mar 12 2026

...gale warning in effect from this evening through friday
afternoon...

.early this morning...northwest winds 10 to 20 knots. waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet. 
.today...northwest winds 5 to 15 knots becoming south less than
10 knots in the afternoon, then becoming southeast 10 to 20 knots
late. a slight chance of snow by mid afternoon. waves subsiding
to calm to 2 feet, then building to 1 to 3 feet. 
.tonight...southeast gales to 35 knots becoming east gales to
40 knots after midnight. freezing spray. snow. waves building to
12 to 17 feet occasionally to 21 feet. 
.friday...northeast gales to 40 knots becoming north gales to
35 knots in the afternoon, then diminishing to 15 to 25 knots
late. freezing spray. a chance of snow showers. waves subsiding
to 5 to 8 feet occasionally to 10 feet. 
.friday night...north winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. freezing spray through midnight. waves
subsiding to calm to 2 feet. 
.saturday...west winds 5 to 15 knots backing southwest by mid
afternoon. waves calm to 2 feet. 
.saturday night...southeast winds 5 to 15 knots becoming
northeast 10 to 20 knots after midnight. waves building to 2 to
4 feet. 
.sunday...northeast gales to 40 knots becoming north gales to
45 knots. heavy freezing spray. a chance of snow showers. waves
building to 17 to 22 feet occasionally to 28 feet. 
.monday...north gales to 45 knots. heavy freezing spray. waves
subsiding to 5 to 8 feet occasionally to 10 feet. 

$$