014
FZUS63 KMQT 182001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Thu Jun 18 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...

29.2 inch low pressure currently over southern Quebec by this
afternoon slowly fills in on Friday over the St. Lawrence Seaway
while a 30.0 inch high builds over the Mid-Mississippi Valley,
persisting into Saturday. 30.0 inch high pressure ridging develops
over Lake Superior on Saturday and remains through Sunday as ridging
progressively increases from northern Canada. The ridging over Lake
Superior increases to 30.2 inches by Monday as the parent high in
northern Canada moves into western Hudson Bay. However, with a weak
30.0 inch Clipper low approaching Lake Superior on Tuesday, expect
the ridging over the lake to weaken to 30.1 inches by late in the
day. The Clipper low then arrives in Lower Michigan on Wednesday.



LSZ162-190800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Thu Jun 18 2026 /301 PM CDT Thu Jun 18 2026/

.LATE THIS AFTERNOON...West winds 10 to 20 knots. A slight chance
of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing southwest in the
afternoon. A chance of showers and a slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. A slight chance of showers. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots becoming northwest
less than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Northeast winds 5 to 15 knots becoming north less than
10 knots. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ263-190800-
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 Thu Jun 18 2026

.LATE THIS AFTERNOON...West winds 10 to 20 knots. A slight chance
of showers and thunderstorms. Waves 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight. A slight chance of showers through
midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots veering west late.
A slight chance of showers through midnight. Waves subsiding to
calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. A slight chance of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds less than 10 knots veering west
after midnight. Waves calm to 2 feet.
.SUNDAY...Northwest winds less than 10 knots becoming northeast
5 to 15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots backing northwest. Waves
calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots diminishing to less than
10 knots. A chance of rain showers. Waves calm to 2 feet.

$$

LSZ264-190800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Thu Jun 18 2026

.LATE THIS AFTERNOON...West winds 10 to 20 knots. A slight chance
of showers and thunderstorms. Waves 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots veering northwest after
midnight. A slight chance of showers through midnight. Waves
subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing southwest late.
Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots becoming west less
than 10 knots late. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots. A slight chance of showers
through early afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...West winds less than 10 knots veering northwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...North winds less than 10 knots increasing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots backing northwest. Waves calm
to 2 feet.
.TUESDAY...West winds less than 10 knots. Waves calm to 2 feet.

$$

LSZ265-190800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Thu Jun 18 2026

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...West winds 15 to 25 knots. Waves building to 1 to
3 feet.
.FRIDAY...West winds 15 to 25 knots diminishing to 5 to 15 knots.
Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. A slight chance of showers after midnight. Waves calm
to 2 feet.
.SATURDAY...West winds 5 to 15 knots veering northwest by mid
afternoon. A slight chance of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots veering northeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering west. Waves calm to
2 feet.

$$

LSZ266-190800-
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 Thu Jun 18 2026

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 2 to
4 feet.
.TONIGHT...West winds 15 to 25 knots veering northwest after
midnight. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.FRIDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots backing southwest late.
Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots veering northwest by mid
afternoon. A slight chance of showers through early afternoon.
Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots veering north by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-190800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Thu Jun 18 2026

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

$$

LSZ261-190200-
MAFOR 1821/
Superior West 12620 11720 12710 11610 12510. Waves 1 to 3 feet
tonight. Waves 1 foot or less Friday.

Superior North Central 12620 14710 12610. Waves 1 to 3 feet.

Superior South Central 15620 11620 11610. Waves 1 to 3 feet.

Superior East 11730 15720 11620. Waves 3 to 5 feet subsiding to 2
to 3 feet tonight. Waves 2 to 4 feet Friday.

$$

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