516
FZUS63 KMQT 030801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM EDT Sun May 3 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 29.6 inch trough moves over Lake Superior this morning as a low
over central Minnesota lifts into northern Ontario. A deepening 29.3
inch low digs over the Canadian Prairies tonight and then deepens to
29.0 inches over northern Ontario on Monday; bringing 29.2 inch
troughing over northern Lake Superior Monday morning. The low lifts
into James Bay by Monday evening as 30.1 inch ridging builds just to
the east of the Canadian Rockies. As the high pressure ridging
shifts to the Canadian Prairies Tuesday and Wednesday, the now 29.2
inch low continues lifting into far northern Quebec. We can thus
expect ridging to slowly build back over Lake Superior to around
29.9 to 30.0 inches by the middle of next week as the ridging
spreads into the rest of the central CONUS. The ridging over Lake
Superior does look to weaken to around 29.8 to 29.9 inches by
Thursday night and Friday as the Upper Great Lakes become sandwiched
between a low just off of the New England coast and troughing on the
lee of the Rockies.


LSZ162-032000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Sun May 3 2026 /301 AM CDT Sun May 3 2026/

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 10 to 20 knots backing southwest late. Waves
calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots increasing to 20 to
30 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...West winds 20 to 30 knots diminishing to 15 to 25 knots
late. A chance of rain showers. Waves subsiding to 2 to 4 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots veering northwest.
Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots veering west. Waves
calm to 2 feet.

$$

LSZ263-032000-
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 AM EDT Sun May 3 2026

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...West winds 5 to 15 knots increasing to 10 to 20 knots in
the afternoon. Waves building to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots increasing to 20 to
30 knots. A chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...Southwest winds 20 to 30 knots veering west in the
afternoon, then diminishing to 15 to 25 knots late. A chance of
rain showers. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-032000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Sun May 3 2026

.EARLY THIS MORNING...South winds 5 to 15 knots. A slight chance
of rain showers. Waves calm to 2 feet.
.TODAY...West winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves building to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming south 15 to
25 knots after midnight, then becoming southwest 20 to 30 knots
late. A chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...Southwest winds 20 to 30 knots veering west in the
afternoon. A chance of rain showers through early afternoon.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...West winds 15 to 25 knots veering northwest after
midnight. Waves subsiding to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-032000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Sun May 3 2026

.EARLY THIS MORNING...South winds 10 to 20 knots. A chance of
rain showers. Waves calm to 2 feet.
.TODAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots in the afternoon. A slight chance of rain showers
through early afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming south 15 to
25 knots after midnight, then becoming southwest 20 to 30 knots
late. A slight chance of rain showers after midnight. Waves
building to 2 to 4 feet.
.MONDAY...Southwest winds to 30 knots with a few gale force gusts
to 35 knots possible veering west in the afternoon. A chance of
rain showers. Waves building to 3 to 5 feet occasionally to
7 feet.
.MONDAY NIGHT...West winds 20 to 30 knots. Waves subsiding to
1 to 3 feet.
.TUESDAY...West winds 15 to 25 knots. Waves subsiding to calm to
2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing west. Waves
calm to 2 feet.

$$

LSZ266-032000-
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 AM EDT Sun May 3 2026

.EARLY THIS MORNING...South winds 10 to 20 knots. A slight chance
of rain showers. Waves calm to 2 feet.
.TODAY...South winds 10 to 20 knots veering west in the
afternoon. A slight chance of rain showers. Waves calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots backing south after
midnight, then increasing to 20 to 30 knots late. A slight chance
of rain showers after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...Southwest winds to 30 knots with a few gale force gusts
to 35 knots possible becoming west 20 to 30 knots in the
afternoon. A chance of rain showers. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...West winds 20 to 30 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots backing west. Waves
calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-032000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Sun May 3 2026

.EARLY THIS MORNING...South winds 10 to 20 knots. A slight chance
of rain showers. Waves calm to 2 feet.
.TODAY...South winds 10 to 20 knots veering west late. A chance
of rain showers. Waves calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots becoming south 5 to 15 knots
after midnight, then increasing to 15 to 25 knots late. A slight
chance of rain showers after midnight. Waves building to 3 to
5 feet occasionally to 7 feet.
.MONDAY...South winds 20 to 30 knots veering southwest in the
afternoon, then becoming west 15 to 25 knots late. Rain showers
likely. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...West winds 15 to 25 knots. A slight chance of
rain showers through midnight. Waves 3 to 6 feet occasionally to
8 feet.
.TUESDAY...West winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ261-031400-
MAFOR 0309/
Superior West 11500 12610 11620 12520 11530 11540. Waves 2 feet
or less today. Waves 1 to 3 feet building to 2 to 4 feet tonight.

Superior North Central 11410 11500 11610 12620 12520 11430. A
chance of rain showers overnight. Waves 1 to 2 feet today. Waves
1 to 3 feet building to 2 to 4 feet tonight.

Superior South Central 12410 14620 11520 11430. A chance of rain
showers early this morning. Waves 2 feet or less today. Waves 1
to 3 feet tonight.

Superior East 13410 11510 12610 11510 11430. A chance of rain
showers today. 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