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000
FZUS63 KMQT 221352
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
952 AM 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...29.5 inch low pressure sliding into Manitoba this
morning will move east and be north of Thunder Bay Ontario by
this evening while deepening to 29.4 inches. This low develops
into a trough of 29.5 inches over eastern Lake Superior Tuesday
morning while 30.3 inch high pressure moves into northern Manitoba
and into northern Ontario by Tuesday evening. This high
strengthens to 30.4 inches and quickly shifts south across Lake
Superior Tuesday night and Wednesday. Ridging shifts east of the
area Thursday ahead of a low pressure that deepens to 29.2 inches
over the North-Central Plains on Friday.



LSZ162-222200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
952 AM EDT Mon Apr 22 2024 /852 AM CDT Mon Apr 22 2024/

.REST OF TODAY...Southwest winds 10 to 20 knots backing south
late. Waves 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west late. A
chance of rain showers and a slight chance of thunderstorms
through midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots late. A slight chance of rain showers through early
afternoon. A chance of snow showers. Waves building to 5 to
8 feet occasionally to 10 feet.
.TUESDAY NIGHT...Northeast winds 10 to 20 knots. Waves subsiding
to 2 to 4 feet.
.WEDNESDAY...East winds 10 to 20 knots. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots becoming southeast 15 to
25 knots. Waves building to 2 to 4 feet.
.FRIDAY...East winds 15 to 25 knots increasing to 20 to 30 knots.
A chance of rain showers, then rain showers. Waves subsiding to
1 to 3 feet, then building to 2 to 4 feet.

$$

LSZ263-222200-
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-
952 AM EDT Mon Apr 22 2024

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

.REST OF TODAY...Southwest winds 15 to 25 knots diminishing to
10 to 20 knots late. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west late. A
chance of rain showers and a slight chance of thunderstorms.
Waves 1 to 3 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 10 feet occasionally to 13 feet, then
subsiding to 5 to 8 feet occasionally to 10 feet.
.TUESDAY NIGHT...Northeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...East winds 5 to 15 knots increasing to 10 to
20 knots 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 increasing to 10 to
20 knots. Waves building to 2 to 4 feet.
.FRIDAY...Southeast winds 15 to 25 knots. Rain showers. Waves
building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ264-222200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
952 AM EDT Mon Apr 22 2024

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

.REST OF TODAY...Southwest winds 15 to 25 knots diminishing to
10 to 20 knots in the afternoon. Waves 2 to 4 feet subsiding to
1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west late. Rain
showers likely through midnight. A slight chance of
thunderstorms. A chance of rain showers after midnight. Waves
1 to 3 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 8 to 11 feet occasionally to 14 feet, then
subsiding to 6 to 9 feet occasionally to 11 feet.
.TUESDAY NIGHT...Northeast winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...East winds 5 to 15 knots veering south 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 10 to 20 knots increasing to 15 to
25 knots. Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...Southeast winds 20 to 30 knots. A chance of rain
showers. Waves building to 4 to 7 feet occasionally to 9 feet.

$$

LSZ265-222200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
952 AM EDT Mon Apr 22 2024

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

.REST OF TODAY...Southwest winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots veering west late. Rain
showers likely through midnight. A slight chance of
thunderstorms. 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 slight chance of rain showers
through early afternoon. A chance of snow showers. Waves building
to 7 to 10 feet occasionally to 13 feet.
.TUESDAY NIGHT...Northeast winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots veering east by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots becoming south 20 to
30 knots. Waves building to 2 to 4 feet.
.FRIDAY...Southeast winds 20 to 30 knots. Rain showers. Waves
building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ266-222200-
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-
952 AM EDT Mon Apr 22 2024

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

.REST OF TODAY...Southwest winds 10 to 20 knots backing south
late. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TONIGHT...South winds 15 to 25 knots becoming southwest 10 to
20 knots late. Rain showers likely through midnight. A slight
chance of thunderstorms. A chance of rain showers after midnight.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 1 to 3 feet.
.TUESDAY...West gales to 35 knots veering north in the afternoon.
A chance of snow showers, possibly mixed with rain. Waves
building to 7 to 11 feet occasionally to 14 feet.
.TUESDAY NIGHT...Northeast winds 20 to 30 knots. Waves 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...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 increasing to 15 to
25 knots. 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. Waves building to 4 to 7 feet
occasionally to 9 feet.

$$

LSZ267-222200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
952 AM EDT Mon Apr 22 2024

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

.REST OF TODAY...Southwest winds 15 to 25 knots backing south
late. Waves 2 to 4 feet building to 3 to 5 feet occasionally to
7 feet, then subsiding to 1 to 3 feet.
.TONIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots late. A chance of rain showers through midnight. A
slight chance of thunderstorms. Rain showers likely after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming north 20 to
30 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 calm to
2 feet, then building to 6 to 9 feet occasionally to 11 feet.
.TUESDAY NIGHT...Northeast gales to 35 knots diminishing to 20 to
30 knots after midnight. Waves building to 7 to 10 feet
occasionally to 13 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots becoming north 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots. Waves building to 2 to 4 feet.
.FRIDAY...Southeast winds 20 to 30 knots increasing to gales to
35 knots. Rain showers likely. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$
LSZ261-222200-
MAFOR 2215/
Superior West...GALE WARNING IN EFFECT...11520 12420 12520 11510
11610 11730. A chance of rain showers tonight and Tuesday
morning. Waves 1 to 3 feet.

Superior North Central...GALE WARNING IN EFFECT...12530 12420
11526 11520 11630 11850. A chance of snow showers Tuesday
morning. Waves 2 to 4 feet this afternoon. Waves 1 to 3 feet
tonight. Waves 3 to 5 feet building to 5 to 8 feet Tuesday
morning.

Superior South Central...GALE WARNING IN EFFECT...11510 12410
11420 11426 11520 11510 11620. Waves 1 to 3 feet.

Superior East...GALE WARNING IN EFFECT...12520 11420 12430 11436
11420 11520. Waves 3 to 5 feet subsiding to 2 to 3 feet this
afternoon. Waves 2 to 4 feet building to 3 to 5 feet tonight.
Waves 2 to 4 feet Tuesday morning.

$$

LC

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

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