Expires:202505170800;;628481
FZUS63 KMQT 162001
GLFLS 

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Fri May 16 2025

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 low will move through Lake Superior tonight at 29.3 
inches, then move into Ontario Saturday. Behind the departing low, a 
30.4 inch high pressure moves over northern Manitoba, extending a 
30.1 inch ridge over the lake by Sunday morning. By early Monday, 
this high strengthens to 30.6 inches over far-northern Ontario and 
southern Hudson Bay, with the ridge over the lake building to 30.3 
inches by Monday and remaining over Lake Superior into Tuesday.



LSZ266-170800-
Lake Superior East of a line from Manitou Island to Marquette MI
and West of a line from Grand Marais MI to the US/Canadian Border
Beyond 5NM from shore-
401 PM EDT Fri May 16 2025

.LATE THIS AFTERNOON...South winds 20 to 30 knots. A chance of
showers and a slight chance of thunderstorms. Waves 3 to 5 feet
occasionally to 7 feet. 
.TONIGHT...South winds 15 to 25 knots becoming southeast 10 to
20 knots after midnight. A slight chance of thunderstorms through
midnight. A chance of rain showers. Patchy fog after midnight.
Waves subsiding to calm to 2 feet. 
.SATURDAY...Northwest winds 10 to 20 knots increasing to 20 to
30 knots. Patchy fog. Rain showers likely through early
afternoon. A slight chance of rain showers by mid afternoon.
Waves building to 7 to 10 feet occasionally to 13 feet. 
.SATURDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of rain showers. Waves building
to 8 to 11 feet occasionally to 14 feet, then subsiding to 3 to
6 feet occasionally to 8 feet. 
.SUNDAY...North winds 15 to 25 knots. Waves subsiding to 2 to
4 feet. 
.SUNDAY NIGHT...North winds 10 to 20 knots becoming northeast
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet. 
.MONDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet. 
.MONDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves subsiding to calm to 2 feet,
then building to 2 to 4 feet. 
.TUESDAY...Northeast winds 15 to 25 knots. Waves subsiding to
1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 15 to 25 knots. Waves subsiding to 2 to
4 feet. 

$$