136
FZUS63 KMQT 232001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 PM EDT Mon Mar 23 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...

Ridging builds to 30.4 inches over the western Great Lakes basin
throughout today. A Clipper low around 29.9 inches tracks across
northern Ontario and briefly extends a 30.1 inch trough over Lake
Superior Tuesday morning. 30.3 inch ridging quickly builds back over
the lake by Tuesday evening associated with high pressure of 30.4
inches over northern Ontario. Another Clipper low around 29.7 inches
phases with a shortwave low lifting off of the Northern Rockies
Tuesday and Tuesday night, bringing troughing of at least 29.8
inches back across Lake Superior by Wednesday. A secondary 29.6 inch
low moves over the Upper Great Lakes Wednesday night into Thursday.
By Friday, expansive ridging of 30.7 inches builds over the Great
Plains, shifting over the Mississippi River Valley by Saturday
morning and south of the Great Lakes by that evening.


LSZ162-240800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 PM EDT Mon Mar 23 2026 /300 PM CDT Mon Mar 23 2026/

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 15 to
25 knots after midnight, then veering west late. A slight chance
of rain showers through midnight. A slight chance of snow
showers. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.TUESDAY...North winds 5 to 15 knots veering east in the
afternoon, then increasing to 10 to 20 knots late. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then backing northeast late. A slight
chance of freezing rain and snow showers after midnight. Waves
building to 1 to 3 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. A slight chance of
freezing rain through early afternoon. A slight chance of snow
showers. Waves building to 2 to 4 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. A chance of snow showers. A chance
of rain showers after midnight. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of rain showers through early
afternoon. A chance of snow showers. Waves building to 2 to
4 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...West winds 10 to 20 knots increasing to 15 to 25 knots.
Waves subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ263-240800-
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 23 2026

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 10 to 20 knots becoming southwest 20 to
30 knots after midnight, then veering west late. A chance of snow
showers. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming northeast 5 to
15 knots in the afternoon, then veering east late. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southeast late.
A slight chance of freezing rain and snow showers after midnight.
Waves building to 2 to 4 feet.
.WEDNESDAY...East winds 10 to 20 knots becoming northeast 5 to
15 knots by mid afternoon. A slight chance of rain showers
through early afternoon. A slight chance of snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A chance of snow showers. A chance
of rain showers after midnight. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.THURSDAY...North winds 10 to 20 knots. A chance of rain showers
through early afternoon. A chance of snow showers. Waves building
to 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots. Freezing spray
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...West winds 10 to 20 knots increasing to 15 to 25 knots.
Freezing spray. Waves subsiding to 2 to 4 feet, then building to
5 to 8 feet occasionally to 10 feet.
.SATURDAY...West winds 15 to 25 knots. Waves subsiding to 3 to
6 feet occasionally to 8 feet.

$$

LSZ264-240800-
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 23 2026

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves calm
to 2 feet building to 1 to 3 feet.
.TONIGHT...South winds 15 to 25 knots becoming southwest 20 to
30 knots after midnight, then becoming west to 30 knots with a
few gale force gusts to 35 knots possible late. A chance of snow
showers. A slight chance of rain showers after midnight. Waves
building to 5 to 9 feet occasionally to 11 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots in the afternoon, then becoming northeast 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. A slight chance of snow showers
after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...East winds 10 to 20 knots becoming northeast 5 to
15 knots by mid afternoon. A slight chance of rain showers
through early afternoon. A chance of snow showers. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of snow showers. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.THURSDAY...North winds 15 to 25 knots. A chance of snow showers
through early afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots. Heavy freezing
spray. Waves building to 4 to 8 feet occasionally to 10 feet.
.FRIDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots. Freezing spray. Waves subsiding to 3 to 5 feet
occasionally to 7 feet, then building to 5 to 8 feet occasionally
to 10 feet.
.SATURDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 4 to 7 feet occasionally
to 9 feet.

$$

LSZ265-240800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 PM EDT Mon Mar 23 2026

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then becoming southwest 20 to 30 knots
late. A chance of snow showers. Waves building to 2 to 4 feet.
.TUESDAY...Northwest winds 10 to 20 knots veering northeast late.
A slight chance of snow showers through early afternoon. Waves
subsiding to 1 to 3 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots veering southeast
after midnight. A slight chance of snow showers after midnight.
Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots becoming east 10 to
20 knots by mid afternoon. A slight chance of rain and snow
showers through early afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots. A chance of snow
showers. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of rain showers through early
afternoon. A chance of snow showers. Freezing spray by mid
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet.
.THURSDAY NIGHT...North winds 20 to 30 knots. Freezing spray.
Waves building to 6 to 10 feet occasionally to 13 feet.
.FRIDAY...Northwest winds 20 to 30 knots backing west. Heavy
freezing spray. Waves subsiding to 2 to 4 feet, then building to
3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 20 to 30 knots. Freezing spray. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ266-240800-
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 23 2026

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight, then becoming southwest to 30 knots with
a few gale force gusts to 35 knots possible late. A chance of
snow showers. A slight chance of rain showers after midnight.
Waves building to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...Northwest winds 20 to 30 knots becoming north 10 to
20 knots in the afternoon. A chance of snow showers through early
afternoon. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots veering southeast
after midnight, then becoming south 15 to 25 knots late. A slight
chance of snow showers after midnight. Waves subsiding to calm to
2 feet, then building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots backing east by mid
afternoon. A chance of snow showers, possibly mixed with rain.
Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots. A chance of snow
showers. A chance of rain showers after midnight. Waves subsiding
to 1 to 3 feet.
.THURSDAY...North winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. A chance of rain showers through early
afternoon. A chance of snow showers. Freezing spray by mid
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet.
.THURSDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. Freezing spray. Waves building to 8 to
11 feet occasionally to 14 feet.
.FRIDAY...Northwest winds 20 to 30 knots backing west. Freezing
spray. Waves subsiding to 5 to 8 feet occasionally to 10 feet,
then building to 7 to 10 feet occasionally to 13 feet.
.SATURDAY...Northwest winds 20 to 30 knots backing west. Freezing
spray. Waves building to 8 to 11 feet occasionally to 14 feet,
then subsiding to 5 to 8 feet occasionally to 10 feet.

$$

LSZ267-240800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 PM EDT Mon Mar 23 2026

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 20 to
30 knots after midnight, then veering southwest late. A chance of
snow showers. Waves building to 6 to 9 feet occasionally to
11 feet.
.TUESDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. A slight chance of snow showers through early afternoon.
Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight, then increasing to 15 to 25 knots
late. A slight chance of snow showers after midnight. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A slight chance of rain showers
through early afternoon. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots veering southeast
after midnight. A chance of snow showers. A chance of rain
showers after midnight. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.THURSDAY...North winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of rain showers through early
afternoon. A chance of snow showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Heavy freezing spray. Waves building to
6 to 9 feet occasionally to 11 feet.
.FRIDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots. Freezing spray. Waves subsiding to 5 to 8 feet
occasionally to 10 feet, then building to 8 to 11 feet
occasionally to 14 feet.
.SATURDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray. Waves building to 9 to 12 feet
occasionally to 15 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.

$$

LSZ261-240200-
MAFOR 2321/
Superior West 11410 11420 11530 11540 11630 11710 11110 11200.
Waves 1 to 3 feet building to 3 to 5 feet tonight. Waves 3 to 5
feet subsiding to 1 foot or less Tuesday.

Superior North Central 11520 11530 11440 11550 11650 11730 11830
11820. A chance of snow showers overnight. Waves 1 to 3 feet
building to 5 to 8 feet tonight. Waves 6 to 9 feet subsiding to 2
to 4 feet Tuesday.

Superior South Central 11610 11420 11430 12540 11630 11720 11820.
A chance of snow showers overnight and Tuesday morning. Waves 1
to 3 feet building to 3 to 5 feet tonight. Waves 3 to 5 feet
subsiding to 2 to 4 feet Tuesday.

Superior East 11610 11520 12540 11547 11640 12730. Waves 1 to 3
feet building to 6 to 9 feet tonight. Waves 5 to 9 feet subsiding
to 4 to 6 feet Tuesday.

$$

WFO MQT

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