670
FZUS63 KMQT 070201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Wed May 6 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...

Expect weak high pressure ridging of 29.9 inches over Lake Superior
tonight with 30.1 inch ridging upstream over the Canadian Prairies
and Southern Plains. By Thursday afternoon, Lake Superior is
projected to be between a 29.4 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 work to pass a 29.7 inch trough over Lake
Superior Friday, strengthening to 29.6 inches by Friday night into
Saturday before the lows consolidate over western Quebec by late
Saturday. High pressure ridging builds back up to 30.1 inches over
Lake Superior by Sunday as the parent high strengthens over the
Canadian Prairies and Northern Plains.


LSZ162-070800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Wed May 6 2026 /901 PM CDT Wed May 6 2026/

.REST OF TONIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest in the
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. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. A slight chance of rain
showers after midnight. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots veering north. Waves calm to
2 feet.
.MONDAY...South winds 5 to 15 knots backing east. Waves calm to
2 feet.

$$

LSZ263-070800-
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-
1001 PM EDT Wed May 6 2026

.REST OF TONIGHT...West winds 5 to 15 knots. Waves 1 to 3 feet
subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest late.
Waves building to 1 to 3 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots. Waves building to 1 to
3 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots veering north. Waves calm to
2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast. Waves calm
to 2 feet.

$$

LSZ264-070800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Wed May 6 2026

.REST OF TONIGHT...West winds 5 to 15 knots. Waves 1 to 3 feet
subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest late.
Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots backing southeast. Waves
calm to 2 feet.

$$

LSZ265-070800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Wed May 6 2026

.REST OF TONIGHT...West winds 10 to 20 knots. Waves calm to
2 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots backing south by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Waves calm to 2 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots backing southeast. Waves
calm to 2 feet.

$$

LSZ266-070800-
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-
1001 PM EDT Wed May 6 2026

.REST OF TONIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves 1 to 3 feet subsiding to calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight, then increasing to 10 to 20 knots late. Waves
calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots becoming south 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. Waves building to
1 to 3 feet.
.SATURDAY...West winds 10 to 20 knots. Waves 1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.MONDAY...Northwest winds 5 to 15 knots backing south. Waves
subsiding to calm to 2 feet.

$$

LSZ267-070800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Wed May 6 2026

.REST OF TONIGHT...West winds 10 to 20 knots. Waves 1 to 3 feet
subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. 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 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A slight chance of rain showers after
midnight. Waves building to 1 to 3 feet.
.SATURDAY...Southwest winds 10 to 20 knots veering west by mid
afternoon. Waves 1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.MONDAY...Northwest winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.

$$

LSZ261-070800-
MAFOR 0703/
Superior West 11610 13600 11610 13510. Waves 2 feet or less.

Superior North Central 11610 13600 11610 11510 11520 11510. Waves
1 to 3 feet.

Superior South Central 15610 11610 11500. Waves 1 to 2 feet.

Superior East 13610 14600 11600. Waves 1 to 3 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