000
FZUS63 KMQT 221959
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
359 PM EDT Mon Apr 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...29.4 inch low pressure skidding across northern Ontario
tonight will track southeast tonight and dive over eastern Lake
Superior at 29.5 inches by Tuesday morning. Meanwhile a 30.3 inch
high pressure shifts into northern Manitoba and into northern
Ontario Tuesday evening. This high strengthens to 30.4 inches and
quickly shifts south across Lake Superior Tuesday night and
Wednesday. Ridging spreads east of the area Thursday ahead of a low
pressure system that deepens to 29.2 inches over the North-Central
Plains Friday. Saturday morning the low fills to 29.4 as spins over
the Upper Great Lakes.

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

.LATE THIS AFTERNOON...South winds 10 to 20 knots. A chance of
rain showers. Waves 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west late. A
chance of rain showers through midnight. Waves subsiding to calm
to 2 feet.
.TUESDAY...West winds 20 to 30 knots veering northeast in the
afternoon, then diminishing to 15 to 25 knots late. A chance of
rain showers, possibly mixed with snow. Waves building to 5 to
9 feet occasionally to 11 feet.
.TUESDAY NIGHT...Northeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then veering east late. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...East winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...East winds 15 to 25 knots veering southeast
after midnight. Waves building to 2 to 4 feet.
.FRIDAY...East winds 15 to 25 knots backing northeast. A chance
of rain showers, then rain showers. Waves 2 to 4 feet.
.SATURDAY...North winds 20 to 30 knots veering northeast. Rain
showers likely, then a chance of rain showers. Waves building to
3 to 5 feet occasionally to 7 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 Mon Apr 22 2024

...GALE WARNING IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
AFTERNOON...

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. A chance
of showers. Waves 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west late. A
chance of rain showers. Waves building to 2 to 4 feet.
.TUESDAY...North gales to 35 knots veering northeast in the
afternoon, then diminishing to 20 to 30 knots late. A chance of
rain showers through early afternoon. A chance of snow showers.
Waves building to 7 to 11 feet occasionally to 14 feet.
.TUESDAY NIGHT...Northeast winds 15 to 25 knots diminishing to
5 to 15 knots late. Waves subsiding to 3 to 5 feet occasionally
to 7 feet.
.WEDNESDAY...East winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...Southeast winds 15 to 25 knots backing east. Rain
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...North winds 20 to 30 knots veering northeast. Rain
showers, then a chance of rain showers. Waves building to 3 to
6 feet occasionally to 8 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 Mon Apr 22 2024

...GALE WARNING IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
AFTERNOON...

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west late. Rain
showers likely through midnight. A chance of rain showers after
midnight. Waves building to 2 to 4 feet.
.TUESDAY...North gales to 35 knots. A chance of rain showers
through early afternoon. A chance of snow showers. Waves building
to 10 to 14 feet occasionally to 18 feet, then subsiding to 9 to
12 feet occasionally to 15 feet.
.TUESDAY NIGHT...Northeast winds 20 to 30 knots diminishing to
10 to 20 knots. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...East winds 5 to 15 knots veering southeast by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...Southeast winds 15 to 25 knots veering south
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.FRIDAY...Southeast winds 20 to 30 knots. A chance of rain
showers, then rain showers. Waves building to 4 to 8 feet
occasionally to 10 feet.
.SATURDAY...North winds 20 to 30 knots veering northeast. Rain
showers. A chance of rain showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.

$$

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

...GALE WARNING IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
AFTERNOON...

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 15 to 25 knots becoming west 10 to
20 knots late. Rain showers likely through midnight. A chance of
rain showers after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.TUESDAY...West winds 15 to 25 knots becoming north gales to
35 knots in the afternoon. A chance of snow showers, possibly
mixed with rain. Waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 9 to 12 feet occasionally to 15 feet.
.TUESDAY NIGHT...North gales to 35 knots becoming northeast 20 to
30 knots after midnight, then diminishing to 15 to 25 knots late.
A slight chance of snow showers through midnight. Waves subsiding
to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots veering east by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...Southeast winds 20 to 30 knots. A chance of rain
showers, then rain showers and a chance of thunderstorms. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...South winds 20 to 30 knots backing north. Rain
showers. A chance of rain showers. Waves subsiding to 2 to
4 feet, then building to 3 to 6 feet occasionally to 8 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 Mon Apr 22 2024

...GALE WARNING IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
AFTERNOON...

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...South winds 15 to 25 knots becoming southwest 10 to
20 knots late. Rain showers likely through midnight. A chance of
rain showers after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.TUESDAY...West winds 20 to 30 knots becoming north gales to
35 knots in the afternoon. A chance of snow showers, possibly
mixed with rain. Waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 9 to 12 feet occasionally to 15 feet.
.TUESDAY NIGHT...Northeast gales to 40 knots diminishing to 15 to
25 knots. A slight chance of snow showers through midnight. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...Southeast winds 20 to 30 knots increasing to gales to
35 knots. A chance of rain showers, then rain showers. Waves
building to 4 to 8 feet occasionally to 10 feet.
.SATURDAY...South winds 20 to 30 knots backing north. Rain
showers. A chance of rain showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet, then building to 4 to 7 feet occasionally
to 9 feet.

$$

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

...GALE WARNING IN EFFECT FROM TUESDAY AFTERNOON THROUGH LATE
TUESDAY NIGHT...

.LATE THIS AFTERNOON...South winds 15 to 25 knots. Waves 1 to
3 feet.
.TONIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots late. A slight chance of rain showers through midnight,
then rain showers after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming north 15 to
25 knots in the afternoon, then becoming northeast gales to
35 knots late. A slight chance of rain showers. A slight chance
of snow showers by mid afternoon. Waves subsiding to 1 to 3 feet,
then building to 8 to 11 feet occasionally to 14 feet.
.TUESDAY NIGHT...Northeast gales to 40 knots diminishing to 20 to
30 knots late. Freezing spray after midnight. Waves building to
9 to 12 feet occasionally to 15 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots backing southeast
after midnight. Waves building to 2 to 4 feet.
.FRIDAY...Southeast winds 20 to 30 knots increasing to gales to
35 knots. A chance of rain showers, then rain showers. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 6 feet occasionally to 8 feet.
.SATURDAY...South gales to 35 knots becoming north 20 to
30 knots. Rain showers. A chance of rain showers. Waves subsiding
to 2 to 4 feet, then building to 3 to 6 feet occasionally to
8 feet.

$$

LSZ261-230400-
MAFOR 2221/
Superior West...GALE WARNING IN EFFECT...11420 13520 11610 11730
11156 11150. A chance of snow showers Tuesday. Waves 1 to 3 feet
tonight building to 6 to 10 feet Tuesday.

Superior North Central...GALE WARNING IN EFFECT...12420 11526
11520 11630 11840 12150. A chance of snow showers Tuesday. Waves
1 to 4 feet tonight building to 9 to 13 feet Tuesday.

Superior South Central...GALE WARNING IN EFFECT...11410 11420
11426 11520 11510 11620 11840 11850. A chance of snow showers
Tuesday afternoon. Waves 1 to 4 feet tonight building to 9 to 12
feet Tuesday.

Superior East...GALE WARNING IN EFFECT...11420 11430 12436 11530
11520 11720 11150. A chance of snow showers Tuesday afternoon.
Waves 2 to 5 feet building to 5 to 8 feet Tuesday.

$$

JSS

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

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