National Weather Service National Headquarters

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

000
FZUS63 KMQT 161352
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
952 AM EDT Tue Apr 16 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...Sprawling high pressure centered over Northern
Ontario is building to 30.4 inches this morning, extending a 30.3
inch ridge over the lake. Meanwhile, expect a tightening pressure
gradient over hte lake beginning this afternoon as a 29.2 inch low
pressure over Nebraska this morning tracks northeast, reaching
Wisconsin on Wednesday while weakening to 29.5 inches. The low
weakens further to 29.7 inches as it tracks east across Lower
Michigan Wednesday night before merging with another 29.7 inch low
pressure over northern Ontario. This low moves into the eastern
James Bay Friday night into Saturday, deepening to 29.3 inches.
Meanwhile, a 30.4 inch high pressure ridge builds southeast into
the Northern Plains extending weak 30.0 inch ridging across the
western lake. Ridging over the lake builds to 30.1 inches
Saturday.


LSZ162-162200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
952 AM EDT Tue Apr 16 2024 /852 AM CDT Tue Apr 16 2024/

...GALE WARNING IN EFFECT FROM 2 PM EDT /1 PM CDT/ THIS AFTERNOON
THROUGH WEDNESDAY AFTERNOON...

.REST OF TODAY...Northeast winds 15 to 25 knots increasing to
gales to 45 knots in the afternoon. A chance of rain showers by
mid afternoon. Waves 3 to 5 feet occasionally to 7 feet building
to 10 to 14 feet occasionally to 18 feet.
.TONIGHT...East gales to 40 knots. Rain showers. Waves building
to 11 to 15 feet occasionally to 19 feet, then subsiding to 8 to
11 feet occasionally to 14 feet.
.WEDNESDAY...Northeast gales to 35 knots diminishing to 20 to
30 knots in the afternoon. Rain showers. Waves building to 9 to
12 feet occasionally to 15 feet, then subsiding to 7 to 10 feet
occasionally to 13 feet.
.WEDNESDAY NIGHT...Northwest winds 15 to 25 knots backing west
after midnight. Rain showers likely through midnight, then a
slight chance of rain showers after midnight. Waves subsiding to
2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots. Waves subsiding to 1 to
3 feet, then building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
2 to 4 feet.
.FRIDAY...West winds 20 to 30 knots. A chance of rain showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ263-162200-
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 Tue Apr 16 2024

...GALE WARNING IN EFFECT FROM THIS EVENING THROUGH WEDNESDAY
AFTERNOON...

.REST OF TODAY...East winds 10 to 20 knots increasing to gales to
40 knots. Waves 1 to 3 feet building to 9 to 12 feet occasionally
to 15 feet.
.TONIGHT...East gales to 40 knots. A chance of rain showers
through midnight, then rain showers after midnight. Waves
building to 9 to 12 feet occasionally to 15 feet, then subsiding
to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY...East gales to 40 knots. A chance of rain showers
through early afternoon, then rain showers by mid afternoon.
Waves building to 12 to 17 feet occasionally to 21 feet, then
subsiding to 10 to 14 feet occasionally to 18 feet.
.WEDNESDAY NIGHT...Northwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. Rain showers likely through
midnight, then a slight chance of rain showers after midnight.
Waves subsiding to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ264-162200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
952 AM EDT Tue Apr 16 2024

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

.REST OF TODAY...East winds 10 to 20 knots increasing to 20 to
30 knots. Waves 1 to 3 feet building to 3 to 6 feet occasionally
to 8 feet.
.TONIGHT...East winds 20 to 30 knots increasing to gales to
40 knots. A slight chance of rain showers through midnight, then
rain showers after midnight. Waves building to 10 to 14 feet
occasionally to 18 feet.
.WEDNESDAY...East gales to 45 knots. Rain showers. Waves building
to 12 to 17 feet occasionally to 21 feet, then subsiding to 10 to
14 feet occasionally to 18 feet.
.WEDNESDAY NIGHT...East winds 20 to 30 knots becoming west 15 to
25 knots after midnight. Rain showers through midnight, then a
chance of rain showers after midnight. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.THURSDAY...West winds 15 to 25 knots backing southwest by mid
afternoon. Waves 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ265-162200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
952 AM EDT Tue Apr 16 2024

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

.REST OF TODAY...East winds 10 to 20 knots increasing to gales to
35 knots. Waves calm to 2 feet building to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...East winds 20 to 30 knots increasing to gales to
35 knots. A slight chance of rain showers through midnight, then
rain showers after midnight. Waves building to 9 to 12 feet
occasionally to 15 feet.
.WEDNESDAY...East gales to 35 knots. Rain showers. Waves building
to 10 to 14 feet occasionally to 18 feet, then subsiding to 9 to
12 feet occasionally to 15 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots becoming west 15 to
25 knots after midnight. Rain showers likely through midnight,
then a slight chance of rain showers after midnight. Waves
subsiding to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 1 to 3 feet.
.FRIDAY...West winds 20 to 30 knots. Waves building to 3 to
6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet.
.SATURDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots. Waves subsiding to calm to 2 feet.

$$

LSZ266-162200-
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 Tue Apr 16 2024

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

.REST OF TODAY...East winds 5 to 15 knots increasing to 15 to
25 knots. Waves calm to 2 feet building to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...East winds 20 to 30 knots increasing to gales to
40 knots. Rain showers after midnight. Waves building to 10 to 14
feet occasionally to 18 feet.
.WEDNESDAY...East gales to 45 knots. Rain showers. Waves building
to 12 to 17 feet occasionally to 21 feet, then subsiding to 10 to
14 feet occasionally to 18 feet.
.WEDNESDAY NIGHT...Southeast gales to 35 knots becoming west
15 to 25 knots after midnight. Rain showers through midnight,
then a chance of rain showers after midnight. Waves subsiding to
2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots becoming west
15 to 25 knots after midnight. A chance of rain showers. Waves
2 to 4 feet.
.FRIDAY...West winds 15 to 25 knots increasing to gales to
35 knots. Waves building to 4 to 8 feet occasionally to 10 feet.
.SATURDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ267-162200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
952 AM EDT Tue Apr 16 2024

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH WEDNESDAY
EVENING...

.REST OF TODAY...East winds 5 to 15 knots backing northeast in
the afternoon, then increasing to 10 to 20 knots late. Waves calm
to 2 feet building to 1 to 3 feet.
.TONIGHT...East winds 15 to 25 knots increasing to 20 to 30 knots
after midnight, then becoming southeast gales to 40 knots late.
Rain showers after midnight. Waves building to 7 to 10 feet
occasionally to 13 feet.
.WEDNESDAY...Southeast gales to 40 knots. Rain showers. Waves
building to 10 to 14 feet occasionally to 18 feet, then subsiding
to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY NIGHT...Southeast gales to 40 knots becoming west
15 to 25 knots after midnight. Rain showers. Waves subsiding to
1 to 3 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of rain showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots veering west
after midnight. A chance of rain showers. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.FRIDAY...West winds 15 to 25 knots increasing to 20 to 30 knots.
A chance of rain showers. Waves building to 4 to 8 feet
occasionally to 10 feet.
.SATURDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots. Waves subsiding to 1 to 3 feet.

$$
LSZ261-162200-
MAFOR 1615/
Superior West...GALE WARNING IN EFFECT...11140 11150 11160 11250
12256 12246. Waves 3 to 5 feet building to 8 to 11 feet this
afternoon. Waves 10 to 14 feet tonight. Waves 8 to 12 feet
Wednesday morning.

Superior North Central...GALE WARNING IN EFFECT...11220 11230
12240 12250 12256. Waves 2 to 4 feet this afternoon. Waves 3 to 5
feet building to 10 to 13 feet tonight. Waves 11 to 15 feet
Wednesday morning.

Superior South Central...GALE WARNING IN EFFECT...11220 11230
13240 11246 12356. Waves 1 to 3 feet building to 2 to 4 feet this
afternoon. Waves 5 to 8 feet building to 7 to 10 feet tonight.
Waves 8 to 11 feet building to 10 to 13 feet Wednesday morning.

Superior East...GALE WARNING IN EFFECT...11210 12120 12240 11250
12356. Waves 1 to 2 feet this afternoon. Waves 1 to 3 feet
building to 7 to 10 feet tonight. Waves 9 to 13 feet Wednesday
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