363
FZUS63 KMQT 291358
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
958 AM EDT Mon Apr 29 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 30.6 inch high pressure over James Bay will shift
northeast into Quebec today. Meanwhile, a 29.7 inch low pressure
over southern Minnesota will track northeast, crossing western
Lake Superior tonight and exiting into Ontario Tuesday morning as
it weakens to 29.8 inches. During Tuesday afternoon and evening,
a weak high pressure ridge of 29.9 inches will shift east across
Lake Superior while a low pressure trough of 29.6 inches moves
from the western Plains to Minnesota and Iowa. This trough will
weaken to 29.7 inches as it sails across Lake Superior on
Wednesday. As a 30.0 inch ridge then shifts east across the
western Great Lakes during Wednesday night, a 29.3 inch Colorado
Low will lift out over the Plains while weakening to 29.5 inches.
This low will then track to the Upper Mississippi Valley on
Thursday and into northern Ontario on Friday.

LSZ162-292200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
958 AM EDT Mon Apr 29 2024 /858 AM CDT Mon Apr 29 2024/

...GALE WARNING IN EFFECT UNTIL 5 PM EDT /4 PM CDT/ THIS
AFTERNOON...

.REST OF TODAY...Northeast gales to 40 knots diminishing to gales
to 35 knots this afternoon, then to 20 to 30 knots late.
Scattered rain showers through late morning, then numerous rain
showers by mid afternoon. Waves 10 to 14 feet occasionally to 18
feet subsiding to 7 to 10 feet occasionally to 13 feet.
.TONIGHT...Northeast winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight, then backing west late. A chance
of rain showers. Waves subsiding to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots in the afternoon, then backing south late. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of rain showers through
midnight, then rain showers after midnight. Waves building to
2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots. A chance of rain
showers in the morning. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet occasionally
to 7 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing east after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 15 to 25 knots. A chance of rain
showers. Waves building to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots veering west. A chance
of rain showers. Waves subsiding to 1 to 3 feet.

$$

LSZ263-292200-
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-
958 AM EDT Mon Apr 29 2024

...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

.REST OF TODAY...East gales to 35 knots diminishing to 20 to
30 knots late. Scattered rain showers. Waves 9 to 12 feet
occasionally to 15 feet subsiding to 7 to 10 feet occasionally to
13 feet.
.TONIGHT...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming west 5 to 15 knots late. A
chance of rain showers. Waves subsiding to 2 to 4 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest late. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A slight chance of rain showers through
midnight, then rain showers likely after midnight. Waves building
to 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of rain showers. Waves
building to 4 to 8 feet occasionally to 10 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots backing south
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 2 to
4 feet.
.FRIDAY...Southwest winds 10 to 20 knots veering west. A chance
of rain showers. Waves 2 to 4 feet.

$$

LSZ264-292200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
958 AM EDT Mon Apr 29 2024

...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

.REST OF TODAY...East gales to 35 knots diminishing to 20 to
30 knots late. Scattered rain showers. Waves 8 to 11 feet
occasionally to 14 feet subsiding to 7 to 10 feet occasionally to
13 feet.
.TONIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming west 5 to 15 knots late.
Rain showers likely through midnight, then a chance of rain
showers after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...Northwest winds 5 to 15 knots backing west in the
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A chance of rain showers after
midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...South winds 15 to 25 knots becoming west 20 to
30 knots by mid afternoon. A chance of rain showers. Waves
building to 4 to 8 feet occasionally to 10 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots. A chance of rain showers.
Waves building to 2 to 4 feet.
.FRIDAY...East winds 10 to 20 knots veering southwest. A chance
of rain showers. Waves 2 to 4 feet.

$$

LSZ265-292200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
958 AM EDT Mon Apr 29 2024

...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

.REST OF TODAY...East winds to 30 knots with a few gale force
gusts to 35 knots diminishing to 15 to 25 knots late. Scattered
rain showers. Waves 7 to 10 feet occasionally to 13 feet subsiding
to 5 to 8 feet occasionally to 10 feet.
.TONIGHT...East winds 10 to 20 knots veering south after
midnight, then veering west late. A chance of rain showers. Waves
subsiding to 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A chance of rain showers after
midnight. Waves building to 1 to 3 feet.
.WEDNESDAY...South winds 10 to 20 knots veering west by mid
afternoon. A chance of showers through early afternoon. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 1 to
3 feet.
.FRIDAY...Southeast winds 15 to 25 knots veering southwest. A
chance of showers. Waves building to 2 to 4 feet, then subsiding
to calm to 2 feet.

$$

LSZ266-292200-
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-
958 AM EDT Mon Apr 29 2024

...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

.REST OF TODAY...East gales to 35 knots diminishing to 20 to
30 knots late. Numerous rain showers through late morning, then
scattered rain showers by mid afternoon. Waves 6 to 10 feet
occasionally to 13 feet.
.TONIGHT...East winds 15 to 25 knots becoming southeast 10 to
20 knots after midnight, then veering southwest late. A chance of
rain showers. Waves subsiding to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots late. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A slight chance of rain showers
after midnight. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.WEDNESDAY...South winds 10 to 20 knots becoming west 15 to
25 knots by mid afternoon. A chance of rain showers. Waves
building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 1 to
3 feet.
.FRIDAY...Southeast winds 15 to 25 knots veering southwest. A
chance of rain showers. Waves building to 2 to 4 feet.

$$

LSZ267-292200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
958 AM EDT Mon Apr 29 2024

.REST OF TODAY...East winds to 30 knots with a few gale force
gusts to 35 knots possible diminishing to 15 to 25 knots. Rain
showers through late morning, then isolated rain showers by mid
afternoon. Waves 4 to 7 feet occasionally to 9 feet subsiding to 3
to 5 feet occasionally to 7 feet.
.TONIGHT...Southeast winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then veering south late. A chance of
rain showers. Waves subsiding to calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots backing southeast
after midnight. A slight chance of rain showers after midnight.
Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering west by mid
afternoon. A chance of rain showers. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 1 to
3 feet.
.FRIDAY...Southeast winds 15 to 25 knots veering southwest. A
chance of rain showers. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.

$$
LSZ261-292200-
MAFOR 2915/
Superior West...GALE WARNING IN EFFECT...12150 19156 11146 11130
11820 11710 12610. Waves 9 to 13 feet this afternoon subsiding to
4 to 6 feet tonight. Waves 2 to 4 feet Tuesday morning.

Superior North Central...GALE WARNING IN EFFECT...12250 19256
11240 19246 11236 11220 11320 11710 11720. Waves 8 to 11 feet
this afternoon subsiding to 4 to 7 feet tonight. Waves 3 to 5
feet Tuesday morning.

Superior South Central...GALE WARNING IN EFFECT...11256 11240
19246 11230 19236 11320 11310 11510 12620. Waves 6 to 9 feet this
afternoon subsiding to 2 to 4 feet tonight and Tuesday morning.

Superior East...GALE WARNING IN EFFECT...12256 11240 11230 11320
11420 11510 11610. Waves 5 to 8 feet this afternoon subsiding to
1 to 4 feet tonight and Tuesday morning.

$$

Jablonski

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

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