413
FZUS63 KMQT 200201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 PM EDT Sun Jul 19 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...

30.0 high pressure moves east as a 29.5 inch low moves into Manitoba
tonight, bringing troughing of 29.7 inches to the upper Midwest. The
low will track into Ontario and deepen to 29.4 inches Monday night
with a 29.5 inch trough over Lake Superior. The low will then push
east into Quebec and retrograde to northern Quebec for midweek.
Meanwhile a 30.1 inch ridge descends southeast over the Midwest
Tuesday through Wednesday night, moving into the Ohio River Valley
on Thursday with weak ridging of 29.9 inches extending back
northwest over Lake Superior. Another high pressure of 30.1 inches
will move south through Ontario on Friday building to 30.2 inches
over eastern Ontario by Saturday morning, extending a 30.1 inch
ridge over Lake Superior.



LSZ162-200800-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 PM EDT Sun Jul 19 2026 /900 PM CDT Sun Jul 19 2026/

.REST OF TONIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight, then veering southwest late.
Patchy smoke. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet building to 1 to 3 feet.
.MONDAY...Southwest winds 20 to 30 knots. A slight chance of
thunderstorms through early afternoon. A chance of showers. A
chance of thunderstorms by mid afternoon. Some thunderstorms may
be severe by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.MONDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A slight chance of showers and
thunderstorms through midnight. Waves subsiding to 1 to 3 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 20 to
30 knots by mid afternoon. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.FRIDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.

$$

LSZ263-200800-
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-
1000 PM EDT Sun Jul 19 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 AM EDT MONDAY...

.REST OF TONIGHT...South winds 5 to 15 knots increasing to 15 to
25 knots. Patchy smoke. A slight chance of showers by midnight. A
slight chance of thunderstorms. Showers likely after midnight.
Waves calm to 2 feet building to 2 to 4 feet.
.MONDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots late. Showers likely and a slight chance of
thunderstorms through early afternoon, then a chance of showers
and thunderstorms by mid afternoon. Some thunderstorms may be
severe by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...West winds 15 to 25 knots. A slight chance of
thunderstorms through midnight. A chance of showers. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northwest winds 20 to 30 knots veering north by mid
afternoon. A slight chance of showers through early afternoon.
Waves 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots. Waves
subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.

$$

LSZ264-200800-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 PM EDT Sun Jul 19 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 AM EDT MONDAY...

.REST OF TONIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Areas of smoke. A chance of showers by
midnight. A chance of thunderstorms. Showers likely after
midnight. Waves calm to 2 feet building to 1 to 3 feet.
.MONDAY...South winds 15 to 25 knots becoming southwest 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. Patchy smoke through early afternoon. Showers likely and a
chance of thunderstorms through early afternoon, then a chance of
showers and a slight chance of thunderstorms by mid afternoon.
Some thunderstorms may be severe by mid afternoon. Waves building
to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...West winds 15 to 25 knots. A slight chance of
thunderstorms through midnight. A chance of showers. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northwest winds 20 to 30 knots. A slight chance of
showers through early afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ265-200800-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 PM EDT Sun Jul 19 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 AM EDT MONDAY...

.REST OF TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Areas of smoke. A chance of showers and
thunderstorms. Waves calm to 2 feet building to 1 to 3 feet.
.MONDAY...South winds 20 to 30 knots veering southwest in the
afternoon, then becoming south 15 to 25 knots late. Patchy smoke.
A slight chance of thunderstorms through early afternoon. Showers
likely. A chance of thunderstorms by mid afternoon. Some
thunderstorms may be severe by mid afternoon. Waves 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight, then increasing to 30 knots with a
few gale force gusts to 35 knots possible late. A slight chance
of thunderstorms through midnight. A chance of showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northwest gales to 40 knots. A slight chance of
showers. Waves building to 8 to 11 feet occasionally to 14 feet.
.TUESDAY NIGHT...Northwest gales to 40 knots. Waves subsiding to
4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ266-200800-
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-
1000 PM EDT Sun Jul 19 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 AM EDT MONDAY...

.REST OF TONIGHT...South winds 15 to 25 knots. Areas of smoke. A
chance of showers and thunderstorms. Waves calm to 2 feet
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.MONDAY...South winds 15 to 25 knots. Patchy smoke. Showers
likely and a chance of thunderstorms. Some thunderstorms may be
severe by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...South winds 15 to 25 knots veering west after
midnight, then increasing to 20 to 30 knots late. A chance of
thunderstorms through midnight. A chance of showers. Waves
subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...Northwest gales to 40 knots. A slight chance of
showers. Waves building to 8 to 12 feet occasionally to 15 feet.
.TUESDAY NIGHT...Northwest gales to 40 knots. Waves subsiding to
5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.FRIDAY...North winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ267-200800-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 PM EDT Sun Jul 19 2026

...DENSE SMOKE ADVISORY IN EFFECT UNTIL 8 AM EDT MONDAY...

.REST OF TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots late. Areas of smoke. A chance of showers and
thunderstorms after midnight. Waves calm to 2 feet building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.MONDAY...South winds 15 to 25 knots increasing to 20 to 30 knots
late. Patchy smoke. A slight chance of thunderstorms through
early afternoon. A chance of showers. A chance of thunderstorms
by mid afternoon. Some thunderstorms may be severe by mid
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...South winds 15 to 25 knots veering west late.
Patchy smoke through midnight. Showers likely through midnight. A
chance of thunderstorms. A chance of showers after midnight.
Waves subsiding to 2 to 4 feet.
.TUESDAY...Northwest winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. A slight chance of showers. Waves
building to 7 to 10 feet occasionally to 13 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots. A slight chance of
showers through midnight. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.WEDNESDAY...Northwest gales to 35 knots becoming west 20 to
30 knots by mid afternoon. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ261-200800-
MAFOR 2003/
Superior West 11320 11530 11536 11546 12540 12630. A chance of
thunderstorms Monday afternoon. Waves 1 to 3 feet overnight.
Waves 1 to 3 feet building to 3 to 5 feet Monday. Waves 3 to 5
feet subsiding to 2 to 4 feet Monday evening.

Superior North Central 11410 11416 11426 11436 11536 12530 11520.
A chance of thunderstorms overnight and Monday morning. Waves 1
to 2 feet overnight. Waves 1 to 3 feet building to 3 to 5 feet
Monday. Waves 3 to 5 feet subsiding to 2 to 4 feet Monday
evening.

Superior South Central 11420 11520 11426 11436 11536 11436 11426
11536. A chance of thunderstorms. Waves 1 to 3 feet overnight.
Waves 2 to 4 feet Monday and Monday evening.

Superior East 12420 12426 11420 12426 11436. A chance of
thunderstorms. Waves 1 to 3 feet building to 2 to 4 feet
overnight. Waves 3 to 5 feet Monday and Monday evening.

$$

WFO MQT

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