fzus63 kmqt 311958
glfls 
expires:202604010800;;607886

open lake forecast for lake superior
national weather service marquette mi
358 pm edt tue mar 31 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...

this afternoon, lake superior is between a 29.7 inch low over 
southern ontario and a 30.3 inch high over the north 
dakota/saskatchewan/manitoba triple point. by wednesday afternoon, 
the low pressure will depart to the east while the high phases with 
another high and builds to 30.6 inches over james bay. wednesday 
night, the high builds to 30.7 inches over quebec while a 29.4 inch 
colorado low moves into western kansas. throughout the day thursday, 
this low moves northeast, reaching wisconsin at 29.5 inches thursday 
night. the low shifts to the ontario/quebec line at 29.7 inches 
friday while another colorado low moves into kansas at 29.7 inches. 
this low moves into eastern iowa by friday night as sprawling 30.7 
inch high pressure resides over far northern ontario and hudson bay. 
the low moves through the upper great lakes at 29.6 inches saturday. 
by sunday, lake superior will be between the low at 29.4 inches over 
western quebec and a 30.3 inch high over the great plains.



lsz162-010800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
358 pm edt tue mar 31 2026 /258 pm cdt tue mar 31 2026/

...gale watch in effect from thursday morning through late
thursday night...

.late this afternoon...northeast winds 5 to 15 knots. a slight
chance of snow showers. waves 3 to 5 feet occasionally to 7 feet.
.tonight...northwest winds 5 to 15 knots becoming northeast 10 to
20 knots after midnight, then increasing to 15 to 25 knots late.
a slight chance of snow showers through midnight. waves subsiding
to 1 to 3 feet, then building to 2 to 4 feet. 
.wednesday...east winds 15 to 25 knots increasing to 20 to
30 knots late. a slight chance of snow by mid afternoon. waves
building to 4 to 7 feet occasionally to 9 feet. 
.wednesday night...east winds 20 to 30 knots increasing to
30 knots with a few gale force gusts to 35 knots possible late. a
chance of snow. waves building to 7 to 10 feet occasionally to
13 feet. 
.thursday...east gales to 40 knots becoming northeast gales to
45 knots by mid afternoon. snow, possibly mixed with sleet. a
slight chance of rain by mid afternoon. waves building to 12 to
17 feet occasionally to 21 feet. 
.thursday night...northeast gales to 45 knots becoming north
gales to 35 knots after midnight. snow through midnight, then a
chance of snow after midnight. waves subsiding to 5 to 8 feet
occasionally to 10 feet. 
.friday...north winds 15 to 25 knots veering northeast by mid
afternoon. waves subsiding to 2 to 4 feet, then building to 3 to
6 feet occasionally to 8 feet. 
.friday night...east winds 20 to 30 knots becoming northeast
gales to 35 knots after midnight. a chance of snow showers
through midnight, then snow showers, possibly mixed with rain
after midnight. waves building to 9 to 12 feet occasionally to
15 feet. 
.saturday...northeast winds 20 to 30 knots backing north. snow
showers, then a chance of snow showers. waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet. 
.sunday...west winds 15 to 25 knots diminishing to 10 to
20 knots. waves subsiding to calm to 2 feet. 

$$

fzus63 kmqt 311958
glfls 
expires:202604010800;;607887

open lake forecast for lake superior
national weather service marquette mi
358 pm edt tue mar 31 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...

this afternoon, lake superior is between a 29.7 inch low over 
southern ontario and a 30.3 inch high over the north 
dakota/saskatchewan/manitoba triple point. by wednesday afternoon, 
the low pressure will depart to the east while the high phases with 
another high and builds to 30.6 inches over james bay. wednesday 
night, the high builds to 30.7 inches over quebec while a 29.4 inch 
colorado low moves into western kansas. throughout the day thursday, 
this low moves northeast, reaching wisconsin at 29.5 inches thursday 
night. the low shifts to the ontario/quebec line at 29.7 inches 
friday while another colorado low moves into kansas at 29.7 inches. 
this low moves into eastern iowa by friday night as sprawling 30.7 
inch high pressure resides over far northern ontario and hudson bay. 
the low moves through the upper great lakes at 29.6 inches saturday. 
by sunday, lake superior will be between the low at 29.4 inches over 
western quebec and a 30.3 inch high over the great plains.



lsz263-010800-
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-
358 pm edt tue mar 31 2026

...gale watch in effect from thursday morning through late
thursday night...

.late this afternoon...northeast winds 5 to 15 knots. a slight
chance of snow showers. waves 3 to 6 feet occasionally to 8 feet.
.tonight...northeast winds 5 to 15 knots. a slight chance of snow
showers through midnight. waves subsiding to 2 to 4 feet. 
.wednesday...east winds 10 to 20 knots increasing to 15 to
25 knots late. waves building to 3 to 6 feet occasionally to
8 feet. 
.wednesday night...east winds 15 to 25 knots. a chance of snow.
waves building to 4 to 7 feet occasionally to 9 feet. 
.thursday...east gales to 45 knots. snow likely through early
afternoon. a slight chance of sleet. snow, possibly mixed with
rain and freezing rain by mid afternoon. waves building to 11 to
15 feet occasionally to 19 feet. 
.thursday night...northeast gales to 45 knots becoming north
gales to 35 knots after midnight. snow, possibly mixed with rain
through midnight. a chance of freezing rain. a chance of snow
after midnight. waves subsiding to 6 to 9 feet occasionally to
11 feet. 
.friday...north winds 15 to 25 knots veering northeast by mid
afternoon. waves subsiding to 3 to 6 feet occasionally to 8 feet.
.friday night...northeast winds 20 to 30 knots veering east after
midnight. a chance of snow showers, possibly mixed with freezing
rain through midnight, then snow showers, possibly mixed with
rain after midnight. waves building to 9 to 12 feet occasionally
to 15 feet. 
.saturday...northeast winds 20 to 30 knots backing north. snow
showers, possibly mixed with rain, then a chance of snow showers.
waves building to 10 to 14 feet occasionally to 18 feet, then
subsiding to 7 to 10 feet occasionally to 13 feet. 
.sunday...northwest winds 20 to 30 knots becoming southwest 10 to
20 knots. waves subsiding to 1 to 3 feet. 

$$