013
FZUS63 KMQT 042028
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
428 PM EDT Thu Jun 4 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 29.7 inch low over northwest Ontario is extending 29.9 inch
troughing over the lake while 30.1 inch highs are over eastern
Hudson Bay and the southern Appalachian range. Throughout this
evening and Friday, the low will move slowly east along the northern
shores of Lake Superior while the highs weaken. By early Saturday
morning, the low will be south of James Bay along the Ontario/Quebec
line. As the low shifts to southern Quebec Saturday evening, weak
29.9 inch ridging will be over the lake as 29.3 inch low pressure
forms in the lee of the Rockies. Ridging builds to 30.0 inches
Sunday as the low weakens to 29.4 inches and moves into the western
Dakotas. By Monday afternoon, Lake Superior will be between 29.2
inch low pressure over Saskatchewan and 30.2 inch high pressure over
the St. Lawrence Seaway. The low moves to the western shores of
Hudson Bay while the high shifts to the Atlantic Seaboard on
Tuesday.



LSZ162-050430-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
428 PM EDT Thu Jun 4 2026 /328 PM CDT Thu Jun 4 2026/

.LATE THIS AFTERNOON...East winds 5 to 15 knots. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering southwest late.
A chance of showers and thunderstorms. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. A slight chance of
showers and thunderstorms. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. A slight chance of
showers and thunderstorms through midnight. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots backing northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots. Waves building to 1 to
3 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves building to 2 to 4 feet, then
subsiding to calm to 2 feet.
.MONDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-050430-
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-
428 PM EDT Thu Jun 4 2026

.LATE THIS AFTERNOON...East winds 5 to 15 knots. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots becoming southwest less than
10 knots after midnight, then increasing to 5 to 15 knots late. A
chance of showers and thunderstorms. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. A slight chance of
showers. A slight chance of thunderstorms by mid afternoon. Waves
calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. A slight chance of
showers and thunderstorms through midnight. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...East winds 10 to 20 knots veering southeast after
midnight. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.MONDAY...East winds 10 to 20 knots becoming southeast 5 to
15 knots. A chance of showers. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.TUESDAY...Northeast winds 5 to 15 knots veering east. Waves
subsiding to calm to 2 feet.

$$

LSZ264-050430-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
428 PM EDT Thu Jun 4 2026

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of thunderstorms through midnight. A chance of
rain showers. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots diminishing to less than
10 knots in the afternoon. A slight chance of showers. Waves calm
to 2 feet.
.FRIDAY NIGHT...Southwest winds less than 10 knots veering
northwest late. A slight chance of rain showers through midnight.
Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds less than 10 knots backing east
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.TUESDAY...Southeast winds 5 to 15 knots. A chance of showers.
Waves subsiding to calm to 2 feet.

$$

LSZ265-050430-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
428 PM EDT Thu Jun 4 2026

.LATE THIS AFTERNOON...East winds 5 to 15 knots. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest late. A
slight chance of thunderstorms through midnight. A chance of
showers. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing east in the
afternoon, then veering southeast late. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots veering west after
midnight, then veering northwest late. A slight chance of showers
and thunderstorms. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots veering north by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots veering east
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots. Waves building to
1 to 3 feet.
.MONDAY...Southeast winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.TUESDAY...Southeast winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ266-050430-
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-
428 PM EDT Thu Jun 4 2026

.LATE THIS AFTERNOON...South winds 5 to 15 knots. A slight chance
of showers. Waves 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots. A chance of showers and a
slight chance of thunderstorms. Waves building to 2 to 4 feet,
then subsiding to calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots veering west after
midnight, then veering northwest late. A slight chance of showers
and thunderstorms. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots veering east
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots. Waves building to
1 to 3 feet.
.MONDAY...Southeast winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.TUESDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet.

$$

LSZ267-050430-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
428 PM EDT Thu Jun 4 2026

.LATE THIS AFTERNOON...South winds 10 to 20 knots. A slight
chance of showers. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots. A chance of showers. A
slight chance of thunderstorms after midnight. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. A slight chance of showers. Waves calm to
2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots veering west late.
A slight chance of rain showers. A slight chance of thunderstorms
after midnight. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.TUESDAY...Southeast winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.

$$

LSZ261-050430-
MAFOR 0421/
Superior West 12300 11100 11400 14500. A chance of showers and
thunderstorms tonight. Waves 1 foot or less.

Superior North Central 12300 11400 11600 12500 11600 11500. A
chance of showers and thunderstorms this evening. A chance of
showers overnight. Waves 1 to 2 feet.

Superior South Central 14410 13400 11200. A chance of showers
tonight and Friday afternoon. Waves 1 to 3 feet tonight. Waves 2
feet or less Friday.

Superior East 15410 11410 11400. A chance of showers tonight and
Friday morning. Waves 1 to 3 feet.

$$

Thompson

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

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