fzus63 kmqt 060201
glfls 
expires:202608060800;;689277

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt wed aug 5 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...

lake superior is currently situated between a 30.2 inch bermuda high 
and a 29.5 inch low over northern manitoba. this low slowly gyrates 
along the west coast of hudson bay, weakening to 29.6 inches by 
thursday evening as the high remains roughly stationary. by midday 
friday, the low deepens back to 29.5 inches along the northern 
ontario hudson bay shoreline, passing a 29.9 inch trough over the 
lake through friday night. weak ridging around 29.9 to 30.0 inches 
then resides over the lake for saturday as 29.7 inch low pressure 
lingers over hudson bay. sunday into monday, a 29.6 inch low in the 
lee of the rockies will pass a weak 29.9 inch trough over the lake. 
a 30.0 inch high will move near the great lakes from the plains 
monday into tuesday in the wake of the trough.




lsz162-060800-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
1001 pm edt wed aug 5 2026 /901 pm cdt wed aug 5 2026/

.rest of tonight...south winds 5 to 15 knots veering southwest
late. waves calm to 2 feet. 
.thursday...southwest winds 15 to 25 knots backing south late.
waves building to 1 to 3 feet. 
.thursday night...southwest winds 15 to 25 knots. a chance of
showers and a slight chance of thunderstorms after midnight.
waves building to 2 to 4 feet, then subsiding to 1 to 3 feet. 
.friday...southwest winds 10 to 20 knots. a chance of showers and
a slight chance of thunderstorms. waves subsiding to calm to
2 feet. 
.friday night...northwest winds 10 to 20 knots backing west after
midnight. waves calm to 2 feet. 
.saturday...west winds 10 to 20 knots backing southwest by mid
afternoon. waves building to 1 to 3 feet, then subsiding to calm
to 2 feet. 
.saturday night...west winds 5 to 15 knots. waves calm to 2 feet.
.sunday...southwest winds 5 to 15 knots veering northwest. waves
calm to 2 feet. 
.monday...west winds 5 to 15 knots. waves calm to 2 feet. 

$$

fzus63 kmqt 060201
glfls 
expires:202608060800;;689278

open lake forecast for lake superior
national weather service marquette mi
1001 pm edt wed aug 5 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...

lake superior is currently situated between a 30.2 inch bermuda high 
and a 29.5 inch low over northern manitoba. this low slowly gyrates 
along the west coast of hudson bay, weakening to 29.6 inches by 
thursday evening as the high remains roughly stationary. by midday 
friday, the low deepens back to 29.5 inches along the northern 
ontario hudson bay shoreline, passing a 29.9 inch trough over the 
lake through friday night. weak ridging around 29.9 to 30.0 inches 
then resides over the lake for saturday as 29.7 inch low pressure 
lingers over hudson bay. sunday into monday, a 29.6 inch low in the 
lee of the rockies will pass a weak 29.9 inch trough over the lake. 
a 30.0 inch high will move near the great lakes from the plains 
monday into tuesday in the wake of the trough.




lsz263-060800-
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-
1001 pm edt wed aug 5 2026

.rest of tonight...south winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then veering southwest late. waves calm
to 2 feet building to 1 to 3 feet. 
.thursday...southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet. 
.thursday night...south winds 15 to 25 knots veering southwest
after midnight. a slight chance of showers and thunderstorms
after midnight. waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet. 
.friday...southwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. a chance of showers through early
afternoon. a slight chance of thunderstorms. showers likely by
mid afternoon. waves subsiding to calm to 2 feet. 
.friday night...west winds 5 to 15 knots. a slight chance of
showers and thunderstorms through midnight. waves calm to 2 feet.
.saturday...west winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet. 
.saturday night...west winds 5 to 15 knots. waves subsiding to
calm to 2 feet. 
.sunday...west winds 10 to 20 knots diminishing to 5 to 15 knots.
waves calm to 2 feet. 
.monday...west winds 5 to 15 knots. waves calm to 2 feet. 

$$