fzus63 kmqt 182002
glfls 
expires:202507190800;;671772

open lake forecast for lake superior
national weather service marquette mi
401 pm edt fri jul 18 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...

30.1 inch high pressure is centered over the lower great lakes this 
afternoon, and is expected to weaken into the evening. late tonight 
into saturday, a weak 29.9 inch trough sweeps across lake superior 
before being replaced with a 30.0 inch high by sunday. as the high 
shifts towards the lower great lakes through tuesday morning, it 
builds to 30.1 inches. low pressure will push out of the rockies on 
tuesday with a 29.8 inch extending from the central plains to the 
hudson bay by wednesday.



lsz162-190800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 pm edt fri jul 18 2025 /301 pm cdt fri jul 18 2025/

.late this afternoon...north winds 5 to 15 knots. showers likely.
waves calm to 2 feet. 
.tonight...east winds 5 to 15 knots backing northeast late. a
chance of showers and a slight chance of thunderstorms. patchy
fog after midnight. waves calm to 2 feet. 
.saturday...north winds 5 to 15 knots backing southwest in the
afternoon. waves calm to 2 feet. 
.saturday night...west winds 5 to 15 knots veering north late.
areas of smoke. waves calm to 2 feet. 
.sunday...east winds 5 to 15 knots. areas of smoke through early
afternoon. waves calm to 2 feet. 
.sunday night...east winds 5 to 15 knots. waves calm to 2 feet. 
.monday...east winds 10 to 20 knots. waves calm to 2 feet. 
.monday night...east winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. a chance of showers and thunderstorms.
waves calm to 2 feet. 
.tuesday...east winds 5 to 15 knots backing northeast. a chance
of showers and thunderstorms. waves calm to 2 feet. 
.wednesday...northwest winds 10 to 20 knots becoming north 5 to
15 knots. a chance of showers and thunderstorms. waves calm to
2 feet. 

$$

fzus63 kmqt 182002
glfls 
expires:202507190800;;671773

open lake forecast for lake superior
national weather service marquette mi
401 pm edt fri jul 18 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...

30.1 inch high pressure is centered over the lower great lakes this 
afternoon, and is expected to weaken into the evening. late tonight 
into saturday, a weak 29.9 inch trough sweeps across lake superior 
before being replaced with a 30.0 inch high by sunday. as the high 
shifts towards the lower great lakes through tuesday morning, it 
builds to 30.1 inches. low pressure will push out of the rockies on 
tuesday with a 29.8 inch extending from the central plains to the 
hudson bay by wednesday.



lsz263-190800-
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-
401 pm edt fri jul 18 2025

.late this afternoon...west winds 5 to 15 knots. a chance of
showers. waves calm to 2 feet. 
.tonight...south winds 5 to 15 knots backing east after midnight,
then backing northeast late. a chance of showers. a slight chance
of thunderstorms after midnight. patchy fog after midnight. waves
calm to 2 feet. 
.saturday...north winds 5 to 15 knots backing southwest in the
afternoon. a slight chance of showers through early afternoon.
waves calm to 2 feet. 
.saturday night...west winds 5 to 15 knots diminishing to less
than 10 knots late. areas of smoke after midnight. waves calm to
2 feet. 
.sunday...north winds 5 to 15 knots veering east by mid
afternoon. waves calm to 2 feet. 
.sunday night...east winds 5 to 15 knots veering southeast after
midnight. waves calm to 2 feet. 
.monday...east winds 5 to 15 knots. waves calm to 2 feet. 
.monday night...east winds 5 to 15 knots veering south after
midnight. a chance of showers and thunderstorms. waves calm to
2 feet. 
.tuesday...south winds 5 to 15 knots. a chance of showers and
thunderstorms. waves calm to 2 feet. 
.wednesday...west winds 5 to 15 knots veering north. a chance of
showers. waves calm to 2 feet. 

$$