825
FZUS63 KMQT 211948
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
348 PM EDT Sat Sep 21 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... Low pressure of 29.6 inches is currently overtop northern
Ontario this afternoon. Its associated 29.9 inch trough will
sweep across Lake Superior during tonight and Sunday morning. In
its wake, 30.1 inch high pressure will build from the Northern
Plains into northern Ontario during Sunday and Monday. Also on
Monday, a 29.7 inch low pressure will track northeast to southern
Wisconsin. 30.0 inch high pressure builds over the Lower MS Valley
Tuesday, building to 30.1 inches Wednesday. High pressure
continues over the Great Lakes Thursday.

LSZ162-220400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
348 PM EDT Sat Sep 21 2024 /248 PM CDT Sat Sep 21 2024/

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. A chance
of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A slight chance of showers and
thunderstorms through midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then becoming west 5 to 15 knots late.
Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots veering northeast late.
Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots. Waves 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.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-220400-
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-
348 PM EDT Sat Sep 21 2024

.LATE THIS AFTERNOON...East winds 5 to 15 knots. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots becoming northwest 15 to
25 knots after midnight. A chance of showers and thunderstorms.
Waves building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then becoming west 5 to 15 knots late.
Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots veering northeast
late. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots. Waves 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.
.THURSDAY...Southwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.

$$

LSZ264-220400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
348 PM EDT Sat Sep 21 2024

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming west 10 to
20 knots after midnight, then becoming northwest 15 to 25 knots
late. A chance of showers and thunderstorms. Waves building to
3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves 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.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ265-220400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
348 PM EDT Sat Sep 21 2024

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. A slight
chance of showers. Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots veering west after
midnight, then veering northwest late. A chance of showers and
thunderstorms. Waves building to 2 to 4 feet, then subsiding to
calm to 2 feet.
.SUNDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A slight chance of showers and
thunderstorms through early afternoon. Waves building to 3 to
6 feet occasionally to 8 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.MONDAY...North winds 10 to 20 knots veering east by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots backing east 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 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ266-220400-
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-
348 PM EDT Sat Sep 21 2024

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. A slight
chance of showers. Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots becoming west 15 to
25 knots late. A chance of showers and thunderstorms. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then veering north late. A chance of
showers and thunderstorms through early afternoon. Waves building
to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.
.SUNDAY NIGHT...North winds 15 to 25 knots becoming northeast
10 to 20 knots late. Waves subsiding to 2 to 4 feet.
.MONDAY...North winds 10 to 20 knots becoming northeast 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...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.

$$

LSZ267-220400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
348 PM EDT Sat Sep 21 2024

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots. A slight chance of showers
through midnight. A chance of thunderstorms. Showers likely after
midnight. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Showers likely through early
afternoon. A chance of thunderstorms. A slight chance of showers
by mid afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.SUNDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight, then veering northeast late. Waves
subsiding to 2 to 4 feet.
.MONDAY...Northeast winds 10 to 20 knots backing north by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots backing northwest
after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ261-220400-
MAFOR 2121/
Superior West 12110 14730 11720 11710. A chance of showers early,
then a chance of showers and thunderstorms this evening. Waves 2
feet or less building to 3 to 5 feet tonight, then subsiding to 1
to 3 feet Sunday.

Superior North Central 11320 11420 11520 11630 11730 11740 12730.
A chance of showers and thunderstorms this evening. A chance of
showers overnight. Waves 1 to 3 feet building to 2 to 5 feet
tonight.

Superior South Central 11320 12420 11510 11720 13730. A chance of
showers and thunderstorms tonight. A chance of showers Sunday
morning. Waves 1 to 4 feet building to 3 to 6 feet Sunday.

Superior East 12310 11420 11410 11526 11736 12730. A chance of
thunderstorms overnight and Sunday morning. Waves 1 to 3 feet
tonight building to 4 to 7 feet Sunday.

$$

BW

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

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