040
FZUS63 KMQT 121442
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
942 AM EST Wed Feb 12 2025

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 30.5 inch high over Quebec is extending ridging up
to 30.3 inches over Lake Superior this morning. As this high
departs northeast through today, a second high pressure will form
to the west. This results in a 30.4 inch high over much of the
Great Plains as a 29.7 inch low ejects from the Southern Plains to
the Lower Great Lakes. As the low reaches the mouth of the St.
Lawrence Thursday evening, the high will build to 30.6 inches over
Illinois. The high further builds to 30.7 inches Friday as it
approaches the Lower Great Lakes. Friday night into Saturday, a
29.7 inch low over the Central Plains will extend 30.1 inch
troughing over Lake Superior, which will be followed by a building
30.8 inch high over southern Saskatchewan by late Saturday night.
The low moves to the New England Atlantic Coast by Sunday night
as the high pressure descends over the Plains.

LSZ162-122245-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
942 AM EST Wed Feb 12 2025 /842 AM CST Wed Feb 12 2025/

.REST OF TODAY...Southwest winds 5 to 15 knots veering west by
mid afternoon. A chance of snow showers. Waves calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots becoming north 10 to
20 knots by midnight, then increasing to 15 to 25 knots late. A
slight chance of snow showers. Waves building to 1 to 3 feet.
.THURSDAY...North winds 15 to 25 knots backing west by mid
afternoon. A slight chance of snow showers in the morning. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots backing southeast in the
afternoon. A chance of snow showers. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...East winds 10 to 20 knots backing northeast after
midnight. Snow showers likely in the evening. Waves building to
2 to 4 feet.
.SATURDAY...North winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.

$$

LSZ263-122245-
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-
942 AM EST Wed Feb 12 2025

.REST OF TODAY...Southwest winds 5 to 15 knots veering west by
mid afternoon. A chance of snow showers. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots becoming north 10 to 20 knots
by midnight. A chance of snow showers. Waves building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY...North winds 15 to 25 knots backing west by mid
afternoon. A chance of snow showers. Waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots. A chance of snow
showers. Waves subsiding to 2 to 4 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south in the
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots becoming north
15 to 25 knots after midnight. Snow showers likely in the
evening, then a chance of snow showers after midnight. Waves
building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...North winds 10 to 20 knots backing northwest. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ264-122245-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
942 AM EST Wed Feb 12 2025

...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM THURSDAY MORNING
THROUGH THURSDAY AFTERNOON...

.REST OF TODAY...Southwest winds 5 to 15 knots. A chance of snow
showers. Waves calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots increasing to 15 to
25 knots. A chance of snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...North winds 15 to 25 knots backing northwest. Heavy
freezing spray in the morning. A slight chance of snow showers.
Waves 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. A slight chance of snow showers.
Waves subsiding to 2 to 4 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south in the
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots backing north after
midnight. Snow showers likely in the evening, then a chance of
snow showers after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Freezing spray. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...North winds 10 to 20 knots. Heavy freezing spray. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.

$$

LSZ265-122245-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
942 AM EST Wed Feb 12 2025

...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM THURSDAY MORNING
THROUGH THURSDAY AFTERNOON...

.REST OF TODAY...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots. A chance of snow showers in the afternoon. Waves
calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots increasing to 15 to
25 knots. A chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northwest winds 20 to 30 knots. Heavy freezing spray.
A chance of snow showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing south in the
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots veering west after
midnight. Snow showers in the evening, then a chance of snow
showers after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots increasing to 20 to
30 knots. Heavy freezing spray. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Heavy freezing spray. A chance of snow showers. Waves
subsiding to 2 to 4 feet.

$$

LSZ266-122245-
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-
942 AM EST Wed Feb 12 2025

...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM THURSDAY MORNING
THROUGH LATE THURSDAY NIGHT...

.REST OF TODAY...South winds 5 to 15 knots veering southwest by
mid afternoon. A chance of snow showers. Waves calm to 2 feet
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming northwest 10 to
20 knots by midnight, then becoming north 15 to 25 knots late.
Snow showers likely. Waves building to 3 to 6 feet occasionally
to 8 feet.
.THURSDAY...North winds 20 to 30 knots becoming northwest to
30 knots with a few gale force gusts to 35 knots possible by late
morning, then diminishing to 20 to 30 knots by mid afternoon.
Heavy freezing spray. Snow showers likely in the morning. A
chance of snow showers in the afternoon. Waves building to 6 to
9 feet occasionally to 11 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. Heavy freezing spray. A chance of
snow showers. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing south in the
afternoon. Waves subsiding to 2 to 4 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. Snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.SATURDAY...North winds 15 to 25 knots increasing to 20 to
30 knots. Heavy freezing spray. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots. Heavy freezing spray. A chance of snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.

$$

LSZ267-122245-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
942 AM EST Wed Feb 12 2025

...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM THURSDAY AFTERNOON
THROUGH FRIDAY MORNING...

.REST OF TODAY...South winds 10 to 20 knots backing southeast.
Snow showers likely in the afternoon. Waves 1 to 3 feet subsiding
to calm to 2 feet.
.TONIGHT...Southeast winds 15 to 25 knots diminishing to 10 to
20 knots by midnight, then backing east late. Snow showers
likely. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 20 to
30 knots by late morning, then increasing to 30 knots with a few
gale force gusts to 35 knots possible by mid afternoon. A chance
of snow showers. Heavy freezing spray in the afternoon. Waves
building to 6 to 9 feet occasionally to 11 feet.
.THURSDAY NIGHT...Northwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. Heavy freezing spray. Snow showers
likely. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming south 15 to
25 knots in the afternoon. A chance of snow showers in the
morning. Waves subsiding to 2 to 4 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. Snow showers. Waves
subsiding to 1 to 3 feet.
.SATURDAY...North winds 10 to 20 knots increasing to 15 to
25 knots. A chance of snow showers. Waves subsiding to calm to
2 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...North winds 15 to 25 knots. A chance of snow showers.
Heavy freezing spray. Waves building to 3 to 6 feet occasionally
to 8 feet.

$$
LSZ261-122245-
MAFOR 1216/
Superior West 12510 11600 11710 14820. Waves around 1 foot this
afternoon. Waves 1 to 4 feet tonight and Thursday morning.

Superior North Central...HEAVY FREEZING SPRAY WARNING IN EFFECT...
12510 11600 11710 14830. A chance of snow showers late this
morning, tonight, and Thursday morning. Waves 1 to 2 feet this
afternoon building to 3 to 5 feet tonight. Waves 4 to 6 feet
Thursday morning.

Superior South Central...HEAVY FREEZING SPRAY WARNING IN EFFECT...
11510 11500 11700 11710 12720 11847 11747. Waves 2 feet or less
this afternoon. Waves 1 foot or less building to 2 to 4 feet
tonight. Waves 5 to 8 feet Thursday morning.

Superior East...HEAVY FREEZING SPRAY WARNING IN EFFECT...12420
13327 11317 11137 11837. Waves 1 to 3 feet this afternoon and
tonight. Waves 1 to 3 feet building to 3 to 5 feet Thursday
morning.

$$

GS

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weather.gov/greatlakes