287
FZUS63 KMQT 220800
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Wed May 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 29.2 inch low pressure currently western Lake
Superior will track into Ontario early this morning. The low
continues north towards James Bay during the day and into
tonight as it weakens to 29.4 inches. 29.9 inch ridging builds in
Thursday across Lake Superior as the low slowly arrives at James
Bay. This ridging shifts east as a 29.6 inch low lifts northeast
through the Northern Plains Thursday night into Friday. Weak
troughing of 29.8 inches moves over Lake Superior by Saturday. By
Sunday, the troughing will move northeast over northern Ontario as
another low of 29.4 inches lifts from the Southern Plains towards
the Upper Great Lakes.

LSZ162-221600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Wed May 22 2024 /300 AM CDT Wed May 22 2024/

...GALE WARNING IN EFFECT THROUGH THIS EVENING...

.EARLY THIS MORNING...Southwest gales to 35 knots. A chance of
rain showers and a slight chance of thunderstorms. Waves 4 to
8 feet occasionally to 10 feet.
.TODAY...Southwest gales to 40 knots veering west in the
afternoon. A slight chance of thunderstorms through early
afternoon. A slight chance of showers. Waves building to 9 to
12 feet occasionally to 15 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.TONIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A slight chance of showers and
thunderstorms. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.FRIDAY...East winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. A chance of rain showers through early
afternoon, then rain showers likely by mid afternoon. Waves
building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...Northeast winds 20 to 30 knots becoming west
15 to 25 knots after midnight. Rain showers likely through
midnight, then a chance of rain showers after midnight. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. A chance of rain showers. Waves subsiding to calm to
2 feet.
.SUNDAY...Northeast winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ263-221600-
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-
400 AM EDT Wed May 22 2024

...GALE WARNING IN EFFECT THROUGH THIS EVENING...

.EARLY THIS MORNING...Southwest gales to 35 knots. A chance of
rain showers and a slight chance of thunderstorms. Waves 6 to
9 feet occasionally to 11 feet.
.TODAY...Southwest gales to 45 knots veering west late. A slight
chance of thunderstorms through early afternoon. A slight chance
of showers. Waves building to 11 to 15 feet occasionally to
19 feet, then subsiding to 9 to 12 feet occasionally to 15 feet.
.TONIGHT...West gales to 35 knots diminishing to 20 to 30 knots
after midnight. A slight chance of rain showers through midnight.
Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.THURSDAY...West winds 15 to 25 knots backing southwest in the
afternoon, then diminishing to 10 to 20 knots late. Waves
subsiding to 2 to 4 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots increasing to 15 to
25 knots after midnight. A slight chance of rain showers through
midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 15 to 25 knots. A chance of rain showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots veering southwest after
midnight. Rain showers likely through midnight. A chance of rain
showers after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...Southwest winds 15 to 25 knots diminishing to 5 to
15 knots. A chance of rain showers. Waves subsiding to calm to
2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-221600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Wed May 22 2024

...GALE WARNING IN EFFECT THROUGH THIS EVENING...

.EARLY THIS MORNING...South gales to 35 knots. A chance of
showers and thunderstorms. Waves 7 to 10 feet occasionally to
13 feet.
.TODAY...Southwest gales to 45 knots. A slight chance of
thunderstorms through early afternoon. A slight chance of rain
showers. Waves building to 11 to 15 feet occasionally to 19 feet,
then subsiding to 10 to 14 feet occasionally to 18 feet.
.TONIGHT...West gales to 35 knots diminishing to 20 to 30 knots
after midnight. A slight chance of rain showers through midnight.
Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. A chance of rain showers by mid afternoon.
Waves building to 1 to 3 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots veering southeast after
midnight. Rain showers likely. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming west 5 to
15 knots. A chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.

$$

LSZ265-221600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Wed May 22 2024

...GALE WARNING IN EFFECT UNTIL 11 AM EDT THIS MORNING...

.EARLY THIS MORNING...South gales to 35 knots. A slight chance of
showers. Waves 4 to 7 feet occasionally to 9 feet.
.TODAY...Southwest winds 20 to 30 knots increasing to gales to
35 knots in the afternoon, then veering west late. A slight
chance of showers by mid afternoon. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.TONIGHT...West winds 20 to 30 knots becoming southwest 15 to
25 knots after midnight, then veering west late. A slight chance
of showers through midnight. Waves subsiding to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. A chance of rain showers by mid afternoon.
Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots veering south after
midnight. Showers likely. Waves building to 1 to 3 feet.
.SATURDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots backing northeast. Waves calm
to 2 feet.

$$

LSZ266-221600-
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-
400 AM EDT Wed May 22 2024

...GALE WARNING IN EFFECT UNTIL 11 AM EDT THIS MORNING...

.EARLY THIS MORNING...South gales to 35 knots. A slight chance of
showers and thunderstorms. Waves 6 to 9 feet occasionally to
11 feet building to 7 to 10 feet occasionally to 13 feet.
.TODAY...South winds 20 to 30 knots with a few gale force gusts
to 35 knots in the afternoon, veering west late. A slight chance
of thunderstorms through early afternoon. A slight chance of
showers. Waves subsiding to 5 to 8 feet occasionally to 10 feet,
then building to 10 to 14 feet occasionally to 18 feet.
.TONIGHT...West winds 20 to 30 knots backing southwest after
midnight, then veering west late. A slight chance of rain showers
through midnight. Waves subsiding to 5 to 8 feet occasionally to
10 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. A chance of rain showers by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. Showers. Waves building to 2 to
4 feet.
.SATURDAY...West winds 10 to 20 knots backing southwest. A chance
of rain showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 1 to 3 feet.
.SUNDAY...Northeast winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.

$$

LSZ267-221600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Wed May 22 2024

...GALE WARNING IN EFFECT UNTIL 11 AM EDT THIS MORNING...

.EARLY THIS MORNING...Southeast gales to 35 knots. A slight
chance of showers and thunderstorms. Waves 5 to 8 feet
occasionally to 10 feet.
.TODAY...South winds 20 to 30 knots diminishing to 15 to 25 knots
in the afternoon, then veering west late. A slight chance of
showers by mid afternoon. Waves subsiding to 1 to 3 feet.
.TONIGHT...West winds 15 to 25 knots backing southwest after
midnight. A slight chance of showers through midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. A chance of showers through
midnight, then showers likely after midnight. Waves building to
2 to 4 feet.
.SATURDAY...West winds 10 to 20 knots backing south. A chance of
showers. Waves subsiding to calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ261-221600-
MAFOR 2209/
Superior West...GALE WARNING IN EFFECT...13550 12650 13640. A
chance of showers this morning. Waves 5 to 8 feet building to 8
to 12 feet today. Waves 6 to 9 feet subsiding to 4 to 7 feet
tonight.

Superior North Central...GALE WARNING IN EFFECT...12450 13550
12650 11640. A chance of showers this morning. Waves 7 to 10 feet
building to 10 to 15 feet today. Waves 10 to 14 feet subsiding to
6 to 9 feet tonight.

Superior South Central...GALE WARNING IN EFFECT...12440 19450
11530 11540 12640 12530. Waves 4 to 7 feet subsiding to 3 to 6
feet today. Waves 2 to 5 feet tonight.

Superior East...GALE WARNING IN EFFECT...11350 11440 11430 11530
12630 12530. Waves 5 to 8 feet subsiding to 3 to 6 feet today and
tonight.

$$

GS

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

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