National Weather Service Weather Forecast Office

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

000
FZUS63 KMQT 280810
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
410 AM EDT Sun Apr 28 2024

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...As 30.5 inch high pressure builds over northern
Ontario today, a 29.6 inch low pressure will lift northeast from
Kansas to Iowa. This low will continue to track northeast, crossing
western Lake Superior late Monday afternoon and evening. As the low
weakens to 29.7 inches while moving over northern Ontario late
Monday night, a weak 29.9 inch ridge will shift east across the
Mississippi Valley. On Tuesday, the ridge will move toward the
Appalachians as the next low pressure of 29.6 inches tracks from the
Dakotas to northern Minnesota. This low will pass just north of Lake
Superior on Wednesday. In its wake, a 29.9 inch ridge will shift
east to the western Great Lakes for Wednesday evening. Overnight
Wednesday through Thursday, a 29.4 inch Colorado Low will weaken to
29.6 inches as it lifts to the Upper Midwest.

LSZ162-281615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
410 AM EDT Sun Apr 28 2024 /310 AM CDT Sun Apr 28 2024/

...GALE WARNING IN EFFECT FROM 2 PM EDT /1 PM CDT/ THIS AFTERNOON
THROUGH MONDAY AFTERNOON...

.EARLY THIS MORNING...Northeast winds 15 to 25 knots. Waves 1 to
3 feet building to 3 to 5 feet occasionally to 7 feet.
.TODAY...Northeast winds 20 to 30 knots increasing to gales to
35 knots in the afternoon, then veering east late. A slight
chance of rain showers by late afternoon. Waves building to 8 to
11 feet occasionally to 14 feet.
.TONIGHT...East gales to 40 knots. A chance of rain showers
through midnight, then rain showers after midnight. Waves
building to 11 to 15 feet occasionally to 19 feet.
.MONDAY...Northeast gales to 40 knots diminishing to 20 to
30 knots late. Rain showers. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. A chance of rain
showers through midnight. Waves subsiding to 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. Rain showers. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 10 to 20 knots becoming north 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ263-281615-
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-
410 AM EDT Sun Apr 28 2024

...GALE WARNING IN EFFECT FROM THIS EVENING THROUGH MONDAY
AFTERNOON...

.EARLY THIS MORNING...Northeast winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Waves building to 7 to 10 feet
occasionally to 13 feet.
.TONIGHT...East gales to 40 knots. A chance of rain showers
through midnight, then rain showers after midnight. Waves
subsiding to 6 to 9 feet occasionally to 11 feet, then building
to 10 to 14 feet occasionally to 18 feet.
.MONDAY...East gales to 40 knots diminishing to 20 to 30 knots
late. Rain showers. Waves subsiding to 7 to 10 feet occasionally
to 13 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. A chance of rain
showers through midnight. Waves subsiding to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Rain showers. Waves building to
3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 10 to 20 knots backing north. A
chance of rain showers. Waves building to 1 to 3 feet.

$$

LSZ264-281615-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
410 AM EDT Sun Apr 28 2024

...GALE WARNING IN EFFECT FROM THIS EVENING THROUGH MONDAY
AFTERNOON...

.EARLY THIS MORNING...North winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...Northeast winds 15 to 25 knots. Waves 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Northeast gales to 35 knots becoming east gales to
40 knots after midnight. A chance of rain showers. Waves building
to 10 to 14 feet occasionally to 18 feet.
.MONDAY...East gales to 40 knots diminishing to 20 to 30 knots
late. Rain showers. Waves subsiding to 7 to 10 feet occasionally
to 13 feet.
.MONDAY NIGHT...East winds 15 to 25 knots becoming west 10 to
20 knots after midnight. A chance of rain showers through
midnight. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. A chance of rain showers through
midnight, then rain showers likely after midnight. Waves
subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 1 to 3 feet.
.THURSDAY...East winds 5 to 15 knots becoming north 10 to
20 knots. A chance of rain showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.

$$

LSZ265-281615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
410 AM EDT Sun Apr 28 2024

...GALE WARNING IN EFFECT FROM THIS EVENING THROUGH MONDAY
AFTERNOON...

.EARLY THIS MORNING...North winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...Northeast winds 15 to 25 knots. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.TONIGHT...East winds 20 to 30 knots increasing to gales to
35 knots. A chance of rain showers through midnight, then rain
showers after midnight. Waves building to 9 to 12 feet
occasionally to 15 feet.
.MONDAY...East gales to 35 knots diminishing to 15 to 25 knots.
Rain showers through early afternoon, then a chance of rain
showers by mid afternoon. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering west after
midnight. A chance of rain showers through midnight. Waves
subsiding to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots becoming east 5 to 15 knots
by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots veering south after
midnight. A chance of rain showers through midnight, then rain
showers likely after midnight. Waves building to 1 to 3 feet.
.WEDNESDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 10 to 20 knots backing north. A
chance of rain showers. Waves calm to 2 feet.

$$

LSZ266-281615-
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-
410 AM EDT Sun Apr 28 2024

...GALE WARNING IN EFFECT FROM THIS EVENING THROUGH MONDAY
AFTERNOON...

.EARLY THIS MORNING...North winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...Northeast winds 15 to 25 knots. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...East winds 20 to 30 knots increasing to gales to
35 knots. A chance of rain showers. Waves building to 9 to 12
feet occasionally to 15 feet.
.MONDAY...East gales to 40 knots diminishing to 20 to 30 knots
late. Rain showers through early afternoon, then a chance of rain
showers by mid afternoon. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.MONDAY NIGHT...Southeast winds 20 to 30 knots becoming west
10 to 20 knots after midnight. A chance of rain showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots. Rain showers
likely after midnight. Waves subsiding to calm to 2 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming south 10 to
20 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 1 to 3 feet.
.THURSDAY...Northeast winds 10 to 20 knots backing north. A
chance of rain showers. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.

$$

LSZ267-281615-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
410 AM EDT Sun Apr 28 2024

.EARLY THIS MORNING...North winds 10 to 20 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots late. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.TONIGHT...East winds 15 to 25 knots increasing to 30 knots with
a few gale force gusts to 35 knots possible. A chance of rain
showers through midnight, then rain showers likely after
midnight. Waves building to 4 to 7 feet occasionally to 9 feet.
.MONDAY...East winds to 30 knots with a few gale force gusts to
35 knots possible becoming southeast 20 to 30 knots late. Rain
showers. Waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...Southeast winds 15 to 25 knots becoming southwest
10 to 20 knots after midnight. A chance of rain showers. Waves
subsiding to 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves building to 2 to 4 feet, then subsiding
to calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots. A chance of rain
showers after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming south 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots backing northeast. A chance
of rain showers. Waves calm to 2 feet.

$$

LSZ261-281615-
MAFOR 2809/
Superior West...GALE WARNING IN EFFECT...12130 12140 11150 12250
11256. Waves 2 to 4 feet building to 5 to 9 feet today and to 10
to 14 feet tonight.

Superior North Central...GALE WARNING IN EFFECT...14130 11130
11140 12250. A chance of rain showers overnight. Waves 3 to 6
feet today building to 8 to 11 feet tonight.

Superior South Central...GALE WARNING IN EFFECT...11830 14130
11140 11250 11256. Waves 3 to 7 feet today building to 6 to 10
feet tonight.

Superior East 11820 13130 12140 12240. A chance of rain showers
overnight. Waves 3 to 6 feet today building to 5 to 8 feet
tonight.


$$

Rolfson

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

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