fzus63 kmqt 311401
glfls 
expires:202603312000;;592986

open lake forecast for lake superior
national weather service marquette mi
1000 am 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...

a 29.7 inch trough extending northeast from the central plains to 
lower michigan moves to southern ontario by this evening, weakening 
to 29.8 inches. meanwhile, 30.3 inch high pressure approaches from 
the northwest. 30.5 inch high pressure ridging moves over lake 
superior by wednesday morning, with the center of the high over 
james bay at 30.6 inches. by thursday morning, the high builds to 
30.8 inches over northern quebec while a 29.5 inch low lifts through 
the central plains. this low passes just south of or through lake 
superior at 29.5 inches thursday night before lifting into northern 
ontario friday morning. while this occurs, another low of 29.6 
inches develops over the central plains. this second low moves over 
lake michigan on saturday before moving through georgian bay 
saturday night.



lsz162-312000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1000 am edt tue mar 31 2026 /900 am cdt tue mar 31 2026/

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

.rest of today...northeast winds 15 to 25 knots diminishing to
10 to 20 knots late. patchy fog by late morning. a slight chance
of rain showers by late morning. a slight chance of snow showers.
waves 4 to 7 feet occasionally to 9 feet subsiding to 3 to 5 feet
occasionally to 7 feet. 
.tonight...northeast winds 10 to 20 knots increasing to 15 to
25 knots late. a slight chance of snow showers through midnight.
waves subsiding to 2 to 4 feet. 
.wednesday...east winds 15 to 25 knots. a slight chance of snow
showers by mid afternoon. waves building to 4 to 7 feet
occasionally to 9 feet. 
.wednesday night...east winds 20 to 30 knots. a slight chance of
snow. waves building to 4 to 8 feet occasionally to 10 feet. 
.thursday...east gales to 35 knots becoming northeast gales to
40 knots by mid afternoon. snow. waves building to 11 to 15 feet
occasionally to 19 feet. 
.thursday night...northeast gales to 40 knots becoming north
20 to 30 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...northeast winds 10 to 20 knots becoming east gales to
35 knots. a chance of snow. rain showers likely. waves subsiding
to 2 to 4 feet, then building to 8 to 11 feet occasionally to
14 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 9 to 12 feet occasionally to 15 feet, then
subsiding to 4 to 7 feet occasionally to 9 feet. 

$$

fzus63 kmqt 311401
glfls 
expires:202603312000;;592987

open lake forecast for lake superior
national weather service marquette mi
1000 am 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...

a 29.7 inch trough extending northeast from the central plains to 
lower michigan moves to southern ontario by this evening, weakening 
to 29.8 inches. meanwhile, 30.3 inch high pressure approaches from 
the northwest. 30.5 inch high pressure ridging moves over lake 
superior by wednesday morning, with the center of the high over 
james bay at 30.6 inches. by thursday morning, the high builds to 
30.8 inches over northern quebec while a 29.5 inch low lifts through 
the central plains. this low passes just south of or through lake 
superior at 29.5 inches thursday night before lifting into northern 
ontario friday morning. while this occurs, another low of 29.6 
inches develops over the central plains. this second low moves over 
lake michigan on saturday before moving through georgian bay 
saturday night.



lsz263-312000-
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-
1000 am edt tue mar 31 2026

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

.rest of today...northeast winds 15 to 25 knots diminishing to
10 to 20 knots late. patchy fog by late morning. a slight chance
of rain showers by late morning. a chance of snow showers. waves
4 to 7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet. 
.tonight...northeast winds 10 to 20 knots diminishing to 5 to
15 knots late. waves subsiding to 2 to 4 feet. 
.wednesday...northeast winds 10 to 20 knots veering east in the
afternoon, then increasing to 15 to 25 knots late. a slight
chance of snow showers by mid afternoon. waves building to 3 to
6 feet occasionally to 8 feet. 
.wednesday night...east winds 15 to 25 knots. a slight chance of
snow after midnight. waves building to 4 to 7 feet occasionally
to 9 feet. 
.thursday...east gales to 40 knots. snow likely through early
afternoon, then snow, possibly mixed with rain by mid afternoon.
waves building to 10 to 14 feet occasionally to 18 feet. 
.thursday night...northeast gales to 40 knots becoming north
20 to 30 knots after midnight. snow through midnight. a chance of
snow after midnight. waves subsiding to 6 to 9 feet occasionally
to 11 feet. 
.friday...northeast winds 15 to 25 knots becoming east gales to
35 knots. a chance of snow. a chance of rain showers. waves
subsiding to 3 to 5 feet occasionally to 7 feet, then building to
8 to 11 feet occasionally to 14 feet. 
.saturday...northeast winds 20 to 30 knots becoming north gales
to 35 knots. snow showers, possibly mixed with rain, then a
chance of snow showers. waves building to 9 to 12 feet
occasionally to 15 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet. 

$$