729
FZUS63 KMQT 092001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 PM EDT Mon Mar 9 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 30.1 inch high will build to 30.3 inches over Manitoba and Ontario
tonight through Tuesday with a 30.1 inch ridge extending over Lake
Superior. The high slowly moves into Quebec Tuesday night as 29.6
low pressure moves into the lower Midwest. This low moves through
the Lower Great Lakes Wednesday at 29.5 inches. Thursday, Lake
Superior will be situated between a 29.3 inch low over southern
Quebec, a 29.4 inch low over North Dakota, a 30.3 inch high over the
Lower Mississippi River Valley, and a 30.1 inch ridge over Hudson
Bay. The Dakotas low arrives near the lake Friday morning, then
moves near the Lower Great Lakes Friday night. A 30.2 inch ridge
will then follow across the Upper Great Lakes Saturday, ahead of an
approaching 29.5 inch low.


LSZ162-100800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 PM EDT Mon Mar 9 2026 /300 PM CDT Mon Mar 9 2026/

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots becoming northeast 10 to
20 knots after midnight. A chance of snow. Waves building to 1 to
3 feet.
.TUESDAY...Northeast winds 15 to 25 knots veering east in the
afternoon. A chance of snow. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots becoming northeast
10 to 20 knots after midnight. A chance of snow. Waves subsiding
to 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. A chance of snow through early afternoon. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Snow showers likely. Waves building to
6 to 9 feet occasionally to 11 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 5 to
15 knots. A chance of snow showers. Waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to calm to
2 feet.
.SATURDAY...East winds 5 to 15 knots becoming northeast 20 to
30 knots. A chance of snow showers. Freezing spray. Waves
building to 5 to 8 feet occasionally to 10 feet.

$$

LSZ263-100800-
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-
400 PM EDT Mon Mar 9 2026

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves 2 to
4 feet.
.TONIGHT...North winds 5 to 15 knots veering northeast after
midnight. A chance of snow. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.TUESDAY...Northeast winds 10 to 20 knots veering east in the
afternoon. A slight chance of snow. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY NIGHT...East winds to 30 knots with a few gale force
gusts to 35 knots possible backing northeast after midnight. A
chance of snow through midnight, then snow likely after midnight.
Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.WEDNESDAY...North gales to 35 knots diminishing to 15 to
25 knots by mid afternoon. A chance of snow through early
afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds less than 10 knots becoming southeast
10 to 20 knots by mid afternoon. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...Southeast winds 20 to 30 knots becoming east
gales to 35 knots after midnight. A chance of snow showers
through midnight, then snow showers likely after midnight.
Freezing spray after midnight. Waves building to 11 to 15 feet
occasionally to 19 feet.
.FRIDAY...North gales to 35 knots becoming northwest 10 to
20 knots. Freezing spray. A chance of snow showers. Waves
building to 12 to 17 feet occasionally to 21 feet, then subsiding
to 2 to 4 feet.
.SATURDAY...East winds 5 to 15 knots increasing to 20 to
30 knots. A chance of snow showers. Freezing spray. Waves
subsiding to calm to 2 feet, then building to 7 to 10 feet
occasionally to 13 feet.

$$

LSZ264-100800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 PM EDT Mon Mar 9 2026

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Northeast winds 5 to 15 knots. A chance of snow. Waves
subsiding to 1 to 3 feet.
.TUESDAY...Northeast winds 5 to 15 knots veering east in the
afternoon. Waves 1 to 3 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots becoming northeast
5 to 15 knots late. A slight chance of snow through midnight,
then snow likely after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...North winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of snow through early
afternoon. Waves 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...Southeast gales to 35 knots. Freezing spray. A
chance of snow showers. Waves building to 12 to 17 feet
occasionally to 21 feet.
.FRIDAY...North gales to 35 knots becoming northwest 15 to
25 knots. A chance of snow showers. Freezing spray. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...North winds 10 to 20 knots becoming east gales to
35 knots. A chance of snow showers. Freezing spray. Waves
subsiding to calm to 2 feet, then building to 8 to 11 feet
occasionally to 14 feet.

$$

LSZ265-100800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 PM EDT Mon Mar 9 2026

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Waves 2 to
4 feet.
.TONIGHT...Northeast winds 10 to 20 knots. A chance of snow.
Waves subsiding to 1 to 3 feet.
.TUESDAY...Northeast winds 10 to 20 knots veering east late. A
slight chance of snow. Waves 1 to 3 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots backing northeast
late. A chance of snow through midnight, then snow likely after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Snow likely through early afternoon,
then a slight chance of snow by mid afternoon. Freezing spray by
mid afternoon. Waves building to 5 to 8 feet occasionally to
10 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. Freezing spray through midnight.
Waves subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots backing southeast by
mid afternoon. Waves subsiding to calm to 2 feet, then building
to 2 to 4 feet.
.THURSDAY NIGHT...Southeast gales to 40 knots. Freezing spray. A
chance of snow showers through midnight. Snow showers likely
after midnight. Waves building to 11 to 15 feet occasionally to
19 feet.
.FRIDAY...North gales to 40 knots becoming northwest 20 to
30 knots. A chance of snow showers. Freezing spray. Waves
building to 12 to 17 feet occasionally to 21 feet, then subsiding
to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...Northwest winds 15 to 25 knots becoming east gales to
35 knots. A chance of snow showers. Freezing spray. Waves
subsiding to 1 to 3 feet, then building to 8 to 11 feet
occasionally to 14 feet.

$$

LSZ266-100800-
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-
400 PM EDT Mon Mar 9 2026

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Waves 5 to
9 feet occasionally to 11 feet.
.TONIGHT...North winds 10 to 20 knots veering northeast late. A
chance of snow. Waves subsiding to 1 to 3 feet.
.TUESDAY...Northeast winds 10 to 20 knots veering east late. A
slight chance of snow. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots backing northeast
late. A chance of snow through midnight, then snow likely after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots becoming north 20 to
30 knots by mid afternoon. Snow likely through early afternoon,
then a slight chance of snow by mid afternoon. Freezing spray by
mid afternoon. Waves building to 5 to 8 feet occasionally to
10 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Freezing spray. Waves building to
6 to 9 feet occasionally to 11 feet, then subsiding to 3 to
5 feet occasionally to 7 feet.
.THURSDAY...Northwest winds 10 to 20 knots. Waves subsiding to
1 to 3 feet, then building to 2 to 4 feet.
.THURSDAY NIGHT...Southeast gales to 40 knots. Freezing spray. A
chance of snow showers through midnight. Snow showers likely
after midnight. Waves building to 12 to 17 feet occasionally to
21 feet.
.FRIDAY...North gales to 40 knots becoming northwest gales to
35 knots. A chance of snow showers. Freezing spray. Waves
building to 15 to 20 feet occasionally to 25 feet, then subsiding
to 9 to 12 feet occasionally to 15 feet.
.SATURDAY...Northwest winds 15 to 25 knots becoming east gales to
35 knots. A chance of snow showers. Freezing spray. Waves
subsiding to 2 to 4 feet, then building to 8 to 11 feet
occasionally to 14 feet.

$$

LSZ267-100800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 PM EDT Mon Mar 9 2026

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves 5 to
9 feet occasionally to 11 feet.
.TONIGHT...North winds 10 to 20 knots veering northeast late. A
chance of snow after midnight. Waves subsiding to 1 to 3 feet.
.TUESDAY...Northeast winds 10 to 20 knots. A slight chance of
snow. Waves 1 to 3 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots backing northeast
late. A chance of snow through midnight, then snow after
midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots becoming north 20 to
30 knots by mid afternoon. Snow likely through early afternoon,
then a chance of snow by mid afternoon. Freezing spray by mid
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Freezing spray. Waves subsiding to
2 to 4 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.THURSDAY NIGHT...Southeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. Heavy freezing spray. A chance
of snow showers through midnight. Snow showers likely after
midnight. Waves building to 9 to 12 feet occasionally to 15 feet.
.FRIDAY...East gales to 35 knots becoming northwest 20 to
30 knots. Freezing spray. A chance of snow showers. Waves
building to 10 to 14 feet occasionally to 18 feet, then subsiding
to 9 to 12 feet occasionally to 15 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming east 20 to
30 knots. A chance of snow showers. Freezing spray. Waves
subsiding to 2 to 4 feet, then building to 5 to 8 feet
occasionally to 10 feet.

$$

LSZ261-100200-
MAFOR 0921/
Superior West 11710 11800 11110 11117 12120 12220. Waves 1 to 3
feet tonight. Waves 2 to 4 feet building to 3 to 5 feet Tuesday.

Superior North Central 11820 11120 14110 11110 11210. A chance of
snow overnight. Waves 3 to 6 feet subsiding to 2 to 4 feet
tonight. Waves 2 to 3 feet Tuesday.

Superior South Central 11820 12110 11117 14110. Waves 3 to 6 feet
subsiding to 2 to 4 feet tonight. Waves 2 to 3 feet Tuesday.

Superior East 11830 12810 14110 11110. A chance of snow
overnight. Waves 6 to 9 feet subsiding to 2 to 3 feet tonight.
Waves 2 to 3 feet Tuesday.

$$

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