531
FZUS63 KMQT 221959
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
359 PM EDT Sun Sep 22 2024

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 29.9 inch trough is departing eastern Lake
Superior this afternoon. In its wake, 30.0 inch high pressure
will build from the Northern Plains into northern Ontario through
Monday. On Tuesday, a 29.8 inch low pressure will track northeast
to lower Michigan while a weakening 29.8 inch trough lifts from
northern Minnesota into Ontario. 30.0 inch high pressure builds
over the Lower MS Valley Wednesday, building to 30.1 inches
Thursday. High pressure continues over the Great Lakes Friday.

LSZ162-230400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
359 PM EDT Sun Sep 22 2024 /259 PM CDT Sun Sep 22 2024/

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering northeast late.
Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering south in the
afternoon, then becoming east 10 to 20 knots late. Waves calm to
2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots becoming southeast 5 to
15 knots after midnight, then veering south late. Waves building
to 1 to 3 feet.
.TUESDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots veering west after
midnight. Waves 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...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing east. Waves
calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots becoming east 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ263-230400-
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-
359 PM EDT Sun Sep 22 2024

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.MONDAY...East winds less than 10 knots becoming southeast 5 to
15 knots in the afternoon, then backing east late. Waves calm to
2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots becoming south
5 to 15 knots late. Waves building to 2 to 4 feet, then subsiding
to 1 to 3 feet.
.TUESDAY...South winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing southeast. Waves
calm to 2 feet.

$$

LSZ264-230400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
359 PM EDT Sun Sep 22 2024

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves 2 to
4 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Northeast winds less than 10 knots becoming southeast
5 to 15 knots in the afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south late.
Waves building to 1 to 3 feet.
.TUESDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-230400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
359 PM EDT Sun Sep 22 2024

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north after
midnight, then diminishing to 5 to 15 knots late. Waves subsiding
to calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots becoming south
5 to 15 knots late. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...West winds 5 to 15 knots backing south. Waves calm to
2 feet.
.FRIDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ266-230400-
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-
359 PM EDT Sun Sep 22 2024

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Waves 4 to
7 feet occasionally to 9 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north after
midnight, then diminishing to 10 to 20 knots late. Waves
subsiding to 1 to 3 feet.
.MONDAY...Northeast winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering south late.
Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast. Waves calm
to 2 feet.

$$

LSZ267-230400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
359 PM EDT Sun Sep 22 2024

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. A slight
chance of showers. Waves 4 to 7 feet occasionally to 9 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north after
midnight, then diminishing to 10 to 20 knots late. Waves
subsiding to 1 to 3 feet.
.MONDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing north late. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots veering southeast
late. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots becoming east 5 to
15 knots by mid afternoon. A slight chance of showers by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots becoming northwest
10 to 20 knots after midnight. A chance of showers. Waves calm to
2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing southeast.
Waves calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ261-230400-
MAFOR 2221/
Superior West 12720 12810 11100 11200 12400. Waves 2 feet or
less.

Superior North Central 12720 12810 11800 11100 11200 11300. Waves
2 to 4 feet subsiding to 1 to 2 feet tonight.

Superior South Central 11730 11720 13810 11110 11100 11200. Waves
3 to 6 feet subsiding to 1 to 3 feet tonight. Waves 1 to 2 feet
Monday.

Superior East 12730 12820 13110 11100. Waves 4 to 7 feet
subsiding to 2 to 4 feet tonight. Waves 1 to 3 feet Monday.

$$

BW

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes