fzus63 kmqt 212001
glfls 
expires:202604220800;;761933

open lake forecast for lake superior
national weather service marquette mi
400 pm edt tue apr 21 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...

30.0 inch high pressure ridging builds over the lake this evening, 
remaining in place through wednesday. a 29.2 inch low then develops 
over the northern rockies on wednesday and tracks into manitoba by 
no later than thursday evening. this sends 29.6 to 29.7 inch 
troughing over lake superior thursday night into friday. 30.1 inch 
ridging slowly returns to lake superior on saturday.



lsz162-220800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
400 pm edt tue apr 21 2026 /300 pm cdt tue apr 21 2026/

.late this afternoon...south winds 5 to 15 knots. waves calm to
2 feet. 
.tonight...east winds less than 10 knots increasing to 5 to
15 knots late. waves calm to 2 feet. 
.wednesday...east winds 5 to 15 knots becoming northeast 10 to
20 knots late. waves calm to 2 feet. 
.wednesday night...northeast winds 10 to 20 knots veering east
late. a chance of rain showers and a slight chance of
thunderstorms. waves building to 2 to 4 feet. 
.thursday...east winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. a slight chance of showers and
thunderstorms by mid afternoon. waves building to 3 to 6 feet
occasionally to 8 feet. 
.thursday night...northeast winds 15 to 25 knots becoming east
10 to 20 knots after midnight. rain showers and a chance of
thunderstorms. waves building to 4 to 7 feet occasionally to
9 feet. 
.friday...northeast winds 15 to 25 knots becoming north 10 to
20 knots by mid afternoon. rain showers likely through early
afternoon, then a chance of rain showers by mid afternoon. waves
subsiding to 3 to 6 feet occasionally to 8 feet. 
.friday night...north winds 10 to 20 knots backing northwest
after midnight. waves subsiding to 2 to 4 feet. 
.saturday...southwest winds 10 to 20 knots becoming northeast
5 to 15 knots. waves subsiding to calm to 2 feet. 
.sunday...east winds 5 to 15 knots becoming northeast 10 to
20 knots. waves building to 1 to 3 feet. 

$$

fzus63 kmqt 212001
glfls 
expires:202604220800;;761934

open lake forecast for lake superior
national weather service marquette mi
400 pm edt tue apr 21 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...

30.0 inch high pressure ridging builds over the lake this evening, 
remaining in place through wednesday. a 29.2 inch low then develops 
over the northern rockies on wednesday and tracks into manitoba by 
no later than thursday evening. this sends 29.6 to 29.7 inch 
troughing over lake superior thursday night into friday. 30.1 inch 
ridging slowly returns to lake superior on saturday.



lsz263-220800-
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 tue apr 21 2026

.late this afternoon...south winds less than 10 knots. waves calm
to 2 feet. 
.tonight...southwest winds less than 10 knots backing east after
midnight, then veering southeast late. waves calm to 2 feet. 
.wednesday...southeast winds less than 10 knots increasing to
5 to 15 knots in the afternoon, then backing east late. waves
calm to 2 feet. 
.wednesday night...east winds 10 to 20 knots. a chance of rain
showers and a slight chance of thunderstorms after midnight.
waves building to 3 to 5 feet occasionally to 7 feet. 
.thursday...east winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. waves building to 6 to 9 feet
occasionally to 11 feet. 
.thursday night...east winds 20 to 30 knots. a chance of rain
showers through midnight. a chance of thunderstorms. rain showers
likely after midnight. waves building to 8 to 11 feet
occasionally to 14 feet. 
.friday...east winds 20 to 30 knots diminishing to 15 to 25 knots
by mid afternoon. rain showers likely through early afternoon. a
chance of rain showers by mid afternoon. waves subsiding to 5 to
8 feet occasionally to 10 feet. 
.friday night...north winds 10 to 20 knots. a chance of rain
showers. waves subsiding to 3 to 6 feet occasionally to 8 feet. 
.saturday...west winds 10 to 20 knots becoming east 5 to
15 knots. waves subsiding to calm to 2 feet. 
.sunday...northeast winds 5 to 15 knots becoming east 10 to
20 knots. waves building to 1 to 3 feet. 

$$