197
FZUS63 KMQT 310201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Thu Jul 30 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...

29.7 inch low pressure is moving over Hudson Bay tonight, dragging a
29.9 inch trough over the lake. Troughing lingers over the lake
through late Friday as the parent low moves into Quebec. A 30.0 inch
high will build over James Bay on Saturday, extending a weak 29.9
inch ridge over the lake. Ridging over the lake will build to 30.0
inches on Sunday and linger into Monday. A weak trough of 29.9
inches will move through the area on Tuesday.



LSZ162-310800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Thu Jul 30 2026 /901 PM CDT Thu Jul 30 2026/

.REST OF TONIGHT...Southwest winds 5 to 15 knots veering west
late. Patchy smoke. A slight chance of showers and thunderstorms
after midnight. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing southwest in the
afternoon, then veering west late. A chance of showers and a
slight chance of thunderstorms. Patchy smoke by mid afternoon.
Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering north late.
Patchy smoke through midnight. A slight chance of showers through
midnight. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...East winds 5 to 15 knots veering southwest. Waves calm
to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ263-310800-
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 Thu Jul 30 2026

.REST OF TONIGHT...Southwest winds 5 to 15 knots veering west
late. Patchy smoke. A slight chance of showers and thunderstorms.
Waves 1 to 3 feet subsiding to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots. Patchy smoke. A slight chance
of showers and thunderstorms. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering north late.
Patchy smoke. A slight chance of showers. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves building to 1 to 3 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-310800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Thu Jul 30 2026

.REST OF TONIGHT...Southwest winds 5 to 15 knots veering west
late. Patchy smoke. A slight chance of showers and thunderstorms.
Waves 1 to 3 feet subsiding to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots. Patchy smoke. A slight chance
of thunderstorms through early afternoon. A slight chance of
showers. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering north late. A
slight chance of showers through midnight. Patchy smoke. Waves
calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots backing north by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds less than 10 knots increasing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves building to 1 to 3 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-310800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Thu Jul 30 2026

.REST OF TONIGHT...South winds 10 to 20 knots veering west late.
Patchy smoke. A slight chance of showers. A slight chance of
thunderstorms after midnight. Waves calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots becoming south 5 to 15 knots
late. Patchy smoke. A chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering north late.
Patchy smoke. A slight chance of showers and thunderstorms. Waves
calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots. A slight chance of
showers. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming south 15 to
25 knots. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering west. A chance of
showers. Waves calm to 2 feet.

$$

LSZ266-310800-
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 Thu Jul 30 2026

.REST OF TONIGHT...South winds 10 to 20 knots veering southwest
after midnight, then diminishing to 5 to 15 knots late. Patchy
smoke. A slight chance of showers and thunderstorms after
midnight. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots. Patchy smoke. A slight chance
of showers and thunderstorms. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering north late.
Patchy smoke. A slight chance of thunderstorms through midnight.
A chance of showers. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A slight chance of showers. Waves calm
to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Northeast winds 5 to 15 knots backing north by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots veering south. Waves
building to 1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots veering west. A chance of
showers. Waves subsiding to calm to 2 feet.

$$

LSZ267-310800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Thu Jul 30 2026

.REST OF TONIGHT...South winds 5 to 15 knots veering southwest
late. Patchy smoke. A slight chance of showers and thunderstorms
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering west in the
afternoon. Patchy smoke. A slight chance of showers. A slight
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering northwest late.
A chance of showers and a slight chance of thunderstorms. Patchy
smoke after midnight. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A slight chance of showers. Waves calm
to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. A slight chance of showers through midnight.
Waves building to 1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering west. A chance of
showers. Waves calm to 2 feet.

$$

LSZ261-310800-
MAFOR 3103/
Superior West 12510 13600 11500 12600. A chance of showers Friday
morning. Waves 2 feet or less.

Superior North Central 12510 13610 13600. Waves 1 to 3 feet.

Superior South Central 12510 13610 11810 11400 11500. A chance of
showers Friday morning and Friday evening. Waves 1 foot or less.

Superior East 11400 13500 14600. A chance of showers Friday
evening. 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