794
FZUS63 KMQT 051401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Tue May 5 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 29.2 inch low over James Bay today weakens to 29.3 inches and
lifts into northern Quebec this evening and tonight as 30.2 inch
ridging builds east of the Canadian Rockies. Wednesday, the 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 is projected to
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 work to pass a 29.8 inch trough over Lake Superior
Thursday night into Friday, with the lows consolidating over Quebec
by Saturday, leaving remnant 29.7 inch troughing over Lake Superior.
High pressure toi 30.1 inches builds back over the Plains by Sunday.


LSZ162-052000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Tue May 5 2026 /901 AM CDT Tue May 5 2026/

.REST OF TODAY...West winds 15 to 25 knots. Waves 3 to 5 feet
occasionally to 7 feet subsiding to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots veering northwest after
midnight. A slight chance of rain and snow showers through
midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots late. 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 northwest
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.
.SATURDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ263-052000-
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 AM EDT Tue May 5 2026

.REST OF TODAY...West winds 15 to 25 knots. Waves 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots veering northwest after
midnight, then diminishing to 5 to 15 knots late. A slight chance
of rain and snow showers through midnight. Waves subsiding to
1 to 3 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing west in the
afternoon. Waves subsiding to calm to 2 feet, then 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 diminishing to
less than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.
.SATURDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ264-052000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Tue May 5 2026

.REST OF TODAY...West winds 15 to 25 knots. Waves 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then becoming northwest 10 to 20 knots late.
Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing west in the
afternoon. Waves subsiding to calm to 2 feet, then 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 diminishing to
less than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ265-052000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Tue May 5 2026

.REST OF TODAY...West winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Waves 1 to 3 feet building to 2 to
4 feet.
.TONIGHT...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...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots veering south. Waves calm to
2 feet.
.SATURDAY...West winds 10 to 20 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ266-052000-
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 AM EDT Tue May 5 2026

.REST OF TODAY...West winds 20 to 30 knots. Waves 4 to 7 feet
occasionally to 9 feet subsiding to 3 to 6 feet occasionally to
8 feet.
.TONIGHT...West winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 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 backing south
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ267-052000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Tue May 5 2026

.REST OF TODAY...West winds 20 to 30 knots. Waves 4 to 7 feet
occasionally to 9 feet subsiding to 3 to 6 feet occasionally to
8 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...West winds 10 to 20 knots veering northwest late.
Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves subsiding to 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...Southwest winds 5 to 15 knots backing south
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots becoming northwest 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ261-052000-
MAFOR 0515/
Superior West 12630 12620 12720 12710. Waves 3 to 5 feet
subsiding to 2 to 4 feet this afternoon. Waves 2 to 4 feet
subsiding to 1 to 3 feet tonight. Waves 2 feet or less Wednesday
morning.

Superior North Central 14630 11620 12720 11710. Waves 3 to 6 feet
this afternoon and tonight. Waves 2 to 3 feet Wednesday morning.

Superior South Central 12640 11630 13620 11610 11710. Waves 3 to
5 feet this afternoon. Waves 3 to 5 feet subsiding to 2 to 4 feet
tonight. Waves 1 to 3 feet Wednesday morning.

Superior East 14630 12620 12710. Waves 4 to 7 feet this
afternoon. Waves 3 to 6 feet subsiding to 2 to 4 feet tonight.
Waves 2 to 4 feet Wednesday morning.

$$

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