008
FZUS63 KMQT 221959
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
359 PM 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 29.3 inch low pressure currently just north of Lake
Superior continues north towards James Bay today 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 29.7 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. This low moves over lower Michigan Monday morning and
becomes centered over Lake Huron Monday evening.

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

...GALE WARNING IN EFFECT UNTIL 8 PM EDT /7 PM CDT/ THIS
EVENING...

.LATE THIS AFTERNOON...West winds 20 to 30 knots with a few gale
force gusts to 35 knots. Scattered showers. Waves 4 to 8 feet
occasionally to 10 feet.
.TONIGHT...West winds 15 to 25 knots. A slight chance of rain
showers through midnight. Waves subsiding to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots in the afternoon, then backing south late. Waves
subsiding to calm to 2 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots increasing to 15 to
25 knots late. A slight chance of rain showers. Waves building to
3 to 6 feet occasionally to 8 feet.
.FRIDAY...East winds 20 to 30 knots with a few gale force gusts
to 35 knots by mid afternoon. A slight chance of rain showers
through early afternoon, then rain showers likely and a slight
chance of thunderstorms by mid afternoon. Waves building to 8 to
11 feet occasionally to 14 feet.
.FRIDAY NIGHT...East winds 20 to 30 knots becoming southwest
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. A chance of showers.
Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots becoming north 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots backing northwest. A chance
of showers. Waves calm to 2 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 Wed May 22 2024

...GALE WARNING IN EFFECT UNTIL 11 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...West gales to 40 knots. Scattered showers.
Waves 9 to 12 feet occasionally to 15 feet subsiding to 7 to
10 feet occasionally to 13 feet.
.TONIGHT...West winds 20 to 30 knots. A slight chance of rain
showers through midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...West winds 15 to 25 knots backing southwest in the
afternoon, then diminishing to 10 to 20 knots late. Waves
subsiding to 1 to 3 feet.
.THURSDAY NIGHT...East winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight, then veering east late. A slight
chance of rain showers through midnight. Waves subsiding to calm
to 2 feet, then building to 2 to 4 feet.
.FRIDAY...East winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. A chance of rain showers. A slight chance of
thunderstorms by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots veering southwest 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. A chance of rain
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 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 Wed May 22 2024

...GALE WARNING IN EFFECT UNTIL 11 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...West gales to 40 knots. Isolated showers.
Waves 10 to 14 feet occasionally to 18 feet subsiding to 9 to
12 feet occasionally to 15 feet.
.TONIGHT...West winds 20 to 30 knots. A chance of rain showers
through midnight. Waves subsiding to 5 to 8 feet occasionally to
10 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots veering northeast
late. 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 and a slight chance of
thunderstorms by mid afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots veering south after
midnight. Rain showers likely. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...Southwest winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.
.MONDAY...North winds 5 to 15 knots. A chance of showers. Waves
building to 1 to 3 feet.

$$

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

.LATE THIS AFTERNOON...West winds to 30 knots with a few gale
force gusts to 35 knots possible. Isolated showers. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A slight chance of rain showers through
midnight. Waves subsiding to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots. Waves subsiding to calm to
2 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. 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 and a slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots veering south
after midnight. Showers and a chance of thunderstorms. Waves
building to 1 to 3 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of showers. Waves subsiding
to calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots. Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots backing northwest. A chance
of showers. Waves calm to 2 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 Wed May 22 2024

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Isolated
showers. Waves 9 to 12 feet occasionally to 15 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. 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...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A slight chance of rain showers by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots veering southeast after
midnight. Showers likely. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...West winds 10 to 20 knots backing southwest by mid
afternoon. A chance of showers. Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots. A chance of showers. Waves
building to 2 to 4 feet.

$$

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

.LATE THIS AFTERNOON...West winds 20 to 30 knots. Scattered rain
showers. Waves 2 to 4 feet building to 3 to 5 feet occasionally
to 7 feet.
.TONIGHT...West winds 15 to 25 knots backing southwest after
midnight. A slight chance of rain showers through midnight. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots veering north late.
Waves subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. A slight 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. A chance of showers through
midnight. Showers likely after midnight. Waves building to 2 to
4 feet.
.SATURDAY...South winds 10 to 20 knots veering west by mid
afternoon. A chance of showers. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Northeast winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots. A chance of showers. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.

$$

LSZ261-230400-
MAFOR 2221/
Superior West...GALE WARNING IN EFFECT...11650 19656 14630 11630
12520. Waves 5 to 9 feet subsiding to 3 to 6 feet tonight, then
subsiding to 1 to 3 feet Thursday.

Superior North Central...GALE WARNING IN EFFECT...12650 14640
12630. A chance of rain showers this evening. Waves 9 to 13 feet
subsiding to 5 to 8 feet tonight, then subsiding to 3 to 6 feet
Thursday.

Superior South Central 12640 14630 11630 11730. Waves 3 to 6 feet
subsiding to 2 to 4 feet tonight and Thursday.

Superior East 11630 19636 11640 12530 14630. Waves 3 to 6 feet
building to 5 to 8 feet tonight and Thursday.

$$

BW

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

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