National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 210801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Sun Jun 21 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

This morning, the Upper Great Lakes are under broad weak 29.9 inch ridging associated with 30.1 inch high pressure over northwest Canada. As a 29.8 inch low passes south of the Great Lakes through Monday morning, high pressure builds to 30.2 inches over northern Manitoba. The high then moves over Hudson Bay, northern Ontario, and Lake Superior for Tuesday, maintaining 30.2 inches. Tuesday afternoon, a weak 30.0 inch low forms over the Dakotas, deepening toi 29.9 inches over Wisconsin Wednesday as the high retreats to Hudson Bay. The low continues slowly pushing east through the Great Lakes Thursday before broad 30.0 inch high pressure fills in over the Upper Great Lakes for Friday.

LSZ162-212000
Lake Superior west of a line from Saxon Harbor WI to Grand Portage MN beyond 5NM
400 AM EDT Sun Jun 21 2026 /300 AM CDT Sun Jun 21 2026/

EARLY THIS MORNING
North winds 5 to 15 knots. Waves calm to 2 feet.

TODAY
Northeast winds 5 to 15 knots veering southeast in the afternoon, then backing east late. Waves calm to 2 feet.

TONIGHT
East winds 5 to 15 knots backing northeast after midnight. Waves calm to 2 feet.

MONDAY
North winds less than 10 knots becoming southwest 5 to 15 knots in the afternoon, then veering north late. Waves calm to 2 feet.

MONDAY NIGHT
North winds 5 to 15 knots diminishing to less than 10 knots after midnight. Waves calm to 2 feet.

TUESDAY
North winds 5 to 15 knots veering northeast by mid afternoon. A chance of rain showers by mid afternoon. Waves calm to 2 feet.

TUESDAY NIGHT
Northeast winds 5 to 15 knots. A chance of rain showers through midnight. Rain showers likely after midnight. Waves calm to 2 feet.

WEDNESDAY
Northeast winds 10 to 20 knots diminishing to 5 to 15 knots. A chance of rain showers. Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.

THURSDAY
North winds 5 to 15 knots diminishing to less than 10 knots. Waves calm to 2 feet.

---

LSZ263-212000
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
400 AM EDT Sun Jun 21 2026

EARLY THIS MORNING
North winds less than 10 knots. Waves calm to 2 feet.

TODAY
North winds less than 10 knots veering northeast in the afternoon. Waves calm to 2 feet.

TONIGHT
Northeast winds less than 10 knots becoming north 5 to 15 knots late. Waves calm to 2 feet.

MONDAY
North winds 5 to 15 knots backing west in the afternoon. Waves calm to 2 feet.

MONDAY NIGHT
West winds 5 to 15 knots diminishing to less than 10 knots after midnight. Waves calm to 2 feet.

TUESDAY
Southwest winds less than 10 knots becoming northeast 5 to 15 knots by mid afternoon. Waves calm to 2 feet.

TUESDAY NIGHT
East winds 5 to 15 knots. A chance of rain showers through midnight. Rain showers likely after midnight. Waves calm to 2 feet.

WEDNESDAY
Northeast winds 5 to 15 knots. A chance of rain showers. Waves calm to 2 feet.

THURSDAY
North winds less than 10 knots backing west. Waves calm to 2 feet.

---

LSZ264-212000
Lake Superior from Upper Entrance to Portage Canal to Manitou Island MI 5NM off shore to the US/Canadian Border
400 AM EDT Sun Jun 21 2026

EARLY THIS MORNING
Northwest winds less than 10 knots. Waves calm to 2 feet.

TODAY
North winds less than 10 knots veering northeast late. Waves calm to 2 feet.

TONIGHT
West winds less than 10 knots becoming northwest 5 to 15 knots after midnight. Waves calm to 2 feet.

MONDAY
Northwest winds 5 to 15 knots backing west late. Waves calm to 2 feet.

MONDAY NIGHT
West winds 5 to 15 knots. Waves calm to 2 feet.

TUESDAY
West winds less than 10 knots backing southwest by mid afternoon. Waves calm to 2 feet.

TUESDAY NIGHT
Southeast winds less than 10 knots becoming east 5 to 15 knots after midnight. Waves calm to 2 feet.

WEDNESDAY
East winds 5 to 15 knots backing northeast. A chance of rain showers. Waves calm to 2 feet.

THURSDAY
North winds less than 10 knots backing west. Waves calm to 2 feet.

---

LSZ265-212000
Lake Superior West of Line from Manitou Island to Marquette MI Beyond 5NM from shore
400 AM EDT Sun Jun 21 2026

EARLY THIS MORNING
West winds 5 to 15 knots. Waves calm to 2 feet.

TODAY
East winds 5 to 15 knots backing northeast in the afternoon, then veering east late. Waves calm to 2 feet.

TONIGHT
Northeast winds 5 to 15 knots backing northwest after midnight. Waves calm to 2 feet.

MONDAY
Northwest winds 5 to 15 knots. Waves calm to 2 feet.

MONDAY NIGHT
Northwest winds 5 to 15 knots. Waves calm to 2 feet.

TUESDAY
Northwest winds 5 to 15 knots veering east by mid afternoon. Waves calm to 2 feet.

TUESDAY NIGHT
Southeast winds 5 to 15 knots. A chance of showers after midnight. Waves calm to 2 feet.

WEDNESDAY
East winds 5 to 15 knots backing north. A chance of showers. Waves calm to 2 feet.

THURSDAY
North winds 5 to 15 knots backing west. Waves calm to 2 feet.

---

LSZ266-212000
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
400 AM EDT Sun Jun 21 2026

EARLY THIS MORNING
West winds 5 to 15 knots. Waves calm to 2 feet.

TODAY
Northwest winds 5 to 15 knots veering northeast late. Waves calm to 2 feet.

TONIGHT
North winds 5 to 15 knots backing northwest after midnight. Waves calm to 2 feet.

MONDAY
Northwest winds 10 to 20 knots. Waves calm to 2 feet.

MONDAY NIGHT
Northwest winds 5 to 15 knots. Waves calm to 2 feet.

TUESDAY
Northwest winds 5 to 15 knots. Waves calm to 2 feet.

TUESDAY NIGHT
East winds 5 to 15 knots veering southeast after midnight. Waves calm to 2 feet.

WEDNESDAY
East winds 5 to 15 knots. Waves calm to 2 feet.

THURSDAY
North winds 5 to 15 knots backing northwest. Waves calm to 2 feet.

---

LSZ267-212000
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off shore to the US/Canadian border
400 AM EDT Sun Jun 21 2026

EARLY THIS MORNING
West winds 5 to 15 knots. Waves calm to 2 feet.

TODAY
West winds 5 to 15 knots veering north in the afternoon. Waves calm to 2 feet.

TONIGHT
North winds 5 to 15 knots backing northwest after midnight. Waves calm to 2 feet.

MONDAY
Northwest winds 10 to 20 knots backing west late. Waves calm to 2 feet.

MONDAY NIGHT
Northwest winds 10 to 20 knots diminishing to 5 to 15 knots after midnight. Waves calm to 2 feet.

TUESDAY
Northwest winds 5 to 15 knots backing west by mid afternoon. Waves calm to 2 feet.

TUESDAY NIGHT
North winds 5 to 15 knots veering southeast after midnight. Waves calm to 2 feet.

WEDNESDAY
East winds 5 to 15 knots. Waves calm to 2 feet.

THURSDAY
Northwest winds 5 to 15 knots increasing to 10 to 20 knots. Waves calm to 2 feet.

---

LSZ261-211400
MAFOR 2109/ Superior West 11800 11100 14200 12100. Waves 1 foot or less.

Superior North Central 12700 11800 11500 14700. Waves 1 foot or less.

Superior South Central 11700 11600 12100 11200 11100 11800 11700. Waves 1 foot or less.

Superior East 12600 11700 12800 13700. Waves 1 foot or less.

---

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