fzus63 kmqt 060801
glfls 
expires:202608062000;;703022

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu aug 6 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.




lsz162-062000-
lake superior west of a line from saxon harbor wi to grand
portage mn beyond 5nm-
401 am edt thu aug 6 2026 /301 am cdt thu aug 6 2026/

.early this morning...southwest winds 5 to 15 knots. waves calm
to 2 feet. 
.today...southwest winds 15 to 25 knots backing south late. waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet. 
.tonight...south winds 15 to 25 knots veering southwest after
midnight, then diminishing to 10 to 20 knots late. a slight
chance of showers and thunderstorms after midnight. waves 1 to
3 feet. 
.friday...southwest winds 10 to 20 knots veering west late. a
chance of showers and a slight chance of thunderstorms. waves
subsiding to calm to 2 feet. 
.friday night...west winds 10 to 20 knots. 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 veering northwest
after midnight. waves calm to 2 feet. 
.sunday...southwest winds 5 to 15 knots veering north. waves calm
to 2 feet. 
.monday...north winds 5 to 15 knots backing northwest. waves calm
to 2 feet. 

$$

fzus63 kmqt 060801
glfls 
expires:202608062000;;703023

open lake forecast for lake superior
national weather service marquette mi
401 am edt thu aug 6 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.




lsz263-062000-
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 am edt thu aug 6 2026

.early this morning...southwest winds 10 to 20 knots. waves calm
to 2 feet building to 1 to 3 feet. 
.today...southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then becoming south 15 to 25 knots
late. waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet. 
.tonight...south winds 15 to 25 knots veering southwest late.
waves subsiding to 1 to 3 feet, then building to 2 to 4 feet. 
.friday...southwest winds 10 to 20 knots. a chance of showers and
thunderstorms. waves subsiding to calm to 2 feet. 
.friday night...west winds 5 to 15 knots. a slight chance of
showers through 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. 
.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...southwest winds 5 to 15 knots veering west. waves calm
to 2 feet. 

$$