849
FZUS63 KMQT 220138
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
938 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...A 29.8 inch trough will sweep across Lake Superior
tonight and Sunday morning. In its wake, 30.0 inch high pressure
will build from the Northern Plains into northern Ontario late
Sunday and Monday. On Tuesday, a 29.7 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.

LSZ162-220945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
938 PM EDT Sat Sep 21 2024 /838 PM CDT Sat Sep 21 2024/

.REST OF TONIGHT...Northwest winds 15 to 25 knots. Waves calm to
2 feet 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.

$$

LSZ263-220945-
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-
938 PM EDT Sat Sep 21 2024

.REST OF TONIGHT...West winds 5 to 15 knots becoming northwest
15 to 25 knots after midnight. A slight chance of showers and
thunderstorms by late evening. Waves calm to 2 feet 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.

$$

LSZ264-220945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
938 PM EDT Sat Sep 21 2024

.REST OF TONIGHT...South winds 5 to 15 knots becoming west 10 to
20 knots after midnight, then becoming northwest 15 to 25 knots
late. A slight chance of showers and thunderstorms after
midnight. Waves 2 to 4 feet 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.

$$

LSZ265-220945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
938 PM EDT Sat Sep 21 2024

.REST OF TONIGHT...South winds 10 to 20 knots veering northwest
late. A slight chance of showers and thunderstorms. Waves 2 to
4 feet subsiding to calm to 2 feet, then building to 2 to 4 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.

$$

LSZ266-220945-
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-
938 PM EDT Sat Sep 21 2024

.REST OF TONIGHT...South winds 10 to 20 knots becoming west 15 to
25 knots late. A chance of showers and thunderstorms. Waves 2 to
4 feet 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.

$$

LSZ267-220945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
938 PM EDT Sat Sep 21 2024

.REST OF TONIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A slight chance of showers by late evening. A
chance of thunderstorms. Showers likely after midnight. Waves
calm to 2 feet 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.

$$
LSZ261-220945-
MAFOR 2203/
Superior West 11730 11740 12730 11720 11710 11610 11710. Waves 1
to 2 feet building to 3 to 5 feet overnight. Waves 2 to 4 feet
subsiding to 1 to 3 feet Sunday. Waves 1 to 2 feet Sunday
evening.

Superior North Central 11520 11630 11730 11740 12730 12720. Waves
2 to 4 feet building to 3 to 5 feet overnight. Waves 3 to 6 feet
subsiding to 2 to 4 feet Sunday. Waves 2 to 4 feet subsiding to 1
to 3 feet Sunday evening.

Superior South Central 11420 11510 11720 14730 11820. A chance of
thunderstorms overnight. A chance of showers Sunday morning.
Waves 1 to 3 feet overnight. Waves 2 to 4 feet building to 3 to 6
feet Sunday. Waves 3 to 6 feet Sunday evening.

Superior East 12420 11526 11736 13730 11830. A chance of
thunderstorms overnight and Sunday morning. Waves 2 to 4 feet
overnight. Waves 1 to 3 feet building to 4 to 7 feet Sunday.
Waves 4 to 6 feet Sunday evening.

$$

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