081
FZUS63 KMQT 211400
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM EDT Wed Oct 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...

A 30.4 inch high pressure over Quebec extending 30.1 inch ridging
westwards over Lake Superior weakens to 30.2 inches today over New
England and the Lower Great Lakes. Meanwhile, a weak 30.0 inch
trough moves over the lake. Another high pressure builds in from the
west in its wake, becoming centered over northern Ontario and the
Upper Great Lakes by Thursday morning. By Friday afternoon, the high
builds to 30.5 inches over the Ontario/Quebec line as a 29.4 inch
low moves into eastern Montana. Saturday afternoon, the high builds
further to 30.6 inches over New England as the 29.4 inch low moves
just north of Lake Winnipeg. The low then lifts northeast to Hudson
Bay on Sunday dragging a 30.2 inch trough across the lake.



LSZ162-212000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 AM EDT Wed Oct 21 2026 /900 AM CDT Wed Oct 21 2026/

.REST OF TODAY...Southwest winds 5 to 15 knots veering west in
the afternoon, then veering northeast late. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots backing northeast late.
Waves calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots veering east
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves building to 2 to 4 feet.
.SATURDAY...South winds 15 to 25 knots becoming west 10 to
20 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots veering north. Waves
subsiding to calm to 2 feet.

$$

LSZ263-212000-
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-
1000 AM EDT Wed Oct 21 2026

.REST OF TODAY...West winds 5 to 15 knots veering north late. A
chance of showers by late morning. Waves 1 to 3 feet subsiding to
calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...East winds less than 10 knots increasing to 5 to
15 knots late. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. Waves building to
2 to 4 feet.
.SATURDAY...South winds 15 to 25 knots veering west. A chance of
showers. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots becoming north 5 to 15 knots.
Waves subsiding to calm to 2 feet.

$$

LSZ264-212000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 AM EDT Wed Oct 21 2026

.REST OF TODAY...West winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then veering north late. A chance of
showers by late morning. Waves 1 to 3 feet subsiding to calm to
2 feet.
.TONIGHT...North winds 5 to 15 knots becoming northeast less than
10 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds less than 10 knots increasing to 5 to
15 knots late. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. Waves building to
2 to 4 feet.
.SATURDAY...South winds 20 to 30 knots becoming west 15 to
25 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...West winds 15 to 25 knots becoming north 5 to 15 knots.
Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ265-212000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 AM EDT Wed Oct 21 2026

.REST OF TODAY...Southwest winds 10 to 20 knots becoming west
5 to 15 knots in the afternoon, then veering north late. A chance
of showers by late morning. Waves calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots veering northeast after
midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots veering southeast in the
afternoon, then becoming east 10 to 20 knots late. Waves calm to
2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. Waves building to
2 to 4 feet.
.SATURDAY...South winds 20 to 30 knots veering west. A chance of
showers. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 1 to 3 feet.
.SUNDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.

$$

LSZ266-212000-
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-
1000 AM EDT Wed Oct 21 2026

.REST OF TODAY...Southwest winds 10 to 20 knots becoming west
5 to 15 knots in the afternoon, then veering northwest late. A
chance of showers. Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots veering northeast after
midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves building to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves 1 to 3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. Waves building to
3 to 5 feet occasionally to 7 feet.
.SATURDAY...South gales to 35 knots. A chance of showers. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...West winds 15 to 25 knots veering north. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ267-212000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 AM EDT Wed Oct 21 2026

.REST OF TODAY...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots in the afternoon, then veering west late. A chance
of showers. Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots veering northeast after
midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.SATURDAY...South winds 20 to 30 knots. A chance of showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.

$$

LSZ261-212000-
MAFOR 2115/
Superior West 11610 11600 14100 11100 11200. Waves 2 feet or
less.

Superior North Central 11620 11710 12800 13100 11200. A chance of
showers this afternoon. Waves 1 to 3 feet this afternoon and
tonight. Waves 1 foot or less Thursday morning.

Superior South Central 11520 11610 11810 12800 12100 11200. A
chance of showers this afternoon. Waves 2 feet or less.

Superior East 11520 11600 11700 11800 14100. A chance of showers
this afternoon. Waves 1 to 3 feet.

$$

WFO MQT

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes