393
FZUS63 KMQT 042001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Mon May 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 29.1 inch low over far-northeast Ontario will lift to James Bay at
29.2 inches by Tuesday morning as 30.2 inch ridging builds east of
the Canadian Rockies. The low continues lifting into far northern
Quebec through Wednesday as high pressure over the Canadian Prairie
splits and moves to the Canadian Four Corners and the Southern
Plains at 30.0 inches and 30.2 inches respectively. By Thursday
afternoon, Lake Superior will be between a 29.5 inch low over Hudson
Bay, a 29.4 inch low over the mouth of the St Lawrence River, a low
of 29.7 inches over the Black Hills, a high of 30.1 inches over
Oklahoma, and a weak 29.9 inch high over the Saskatchewan/Manitoba
line. The Hudson Bay and Black Hills lows will work to pass a 29.8
inch trough over Lake Superior Thursday night into Friday, with the
lows consolidating over Quebec and the Canadian Maritimes by
Saturday morning, leaving remnant 29.8 inch troughing over Lake
Superior.


LSZ162-050800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Mon May 4 2026 /301 PM CDT Mon May 4 2026/

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TONIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots veering northwest. Waves calm
to 2 feet.
.SATURDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ263-050800-
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-
401 PM EDT Mon May 4 2026

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 5 to
8 feet occasionally to 10 feet.
.TONIGHT...West winds 20 to 30 knots becoming northwest 15 to
25 knots after midnight, then becoming west 10 to 20 knots late.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ264-050800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Mon May 4 2026

...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...West gales to 35 knots. Waves 6 to 9 feet
occasionally to 11 feet.
.TONIGHT...West winds 20 to 30 knots becoming northwest 15 to
25 knots after midnight, then backing west late. Waves subsiding
to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots veering northwest. Waves calm
to 2 feet.
.SATURDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ265-050800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Mon May 4 2026

.LATE THIS AFTERNOON...West winds to 30 knots with a few gale
force gusts to 35 knots possible. Waves 3 to 6 feet occasionally
to 8 feet.
.TONIGHT...West winds 20 to 30 knots veering northwest after
midnight, then backing west late. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.TUESDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves 2 to 4 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing west. Waves
calm to 2 feet.

$$

LSZ266-050800-
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-
401 PM EDT Mon May 4 2026

...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 6 to
9 feet occasionally to 11 feet.
.TONIGHT...West winds 20 to 30 knots. Waves subsiding to 4 to
7 feet occasionally to 9 feet.
.TUESDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots becoming northwest
10 to 20 knots late. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots veering northwest. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ267-050800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Mon May 4 2026

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet building to 4 to 7 feet
occasionally to 9 feet.
.TONIGHT...West winds 20 to 30 knots. Waves building to 4 to
8 feet occasionally to 10 feet.
.TUESDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet.

$$

LSZ261-050200-
MAFOR 0421/
Superior West 12630 12730 14620. Waves 3 to 6 feet subsiding to 2
to 4 feet tonight. Waves 2 to 4 feet Tuesday.

Superior North Central...GALE WARNING IN EFFECT...11650 11640
11740 11730 14630. Waves 5 to 9 feet subsiding to 3 to 6 feet
tonight. Waves 3 to 6 feet Tuesday.

Superior South Central...GALE WARNING IN EFFECT...12640 11740
14630 11630. Waves 3 to 6 feet.

Superior East...GALE WARNING IN EFFECT...13640 14630 11630. Waves
5 to 8 feet.

$$

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