National Weather Service Weather Forecast Office

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

000
FZUS63 KMQT 152013
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
413 PM EDT Mon Apr 15 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...30.1 inch ridging across western Lake Superior this
afternoon builds to 30.3 inches over the eastern lake by Tuesday
morning. A 29.2 inch low pressure over Nebraska Tuesday morning
tracks northeast to 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. For Thursday night and
Friday, a 30.4 inch high pressure ridge builds southeast onto the
Northern Plains extending weak 30.0 inch ridging across the
western lake. High pressure continues to build to 30.2 inches
Saturday.

LSZ162-160415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
413 PM EDT Mon Apr 15 2024 /313 PM CDT Mon Apr 15 2024/

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

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves building to 2 to 4 feet.
.TUESDAY...East winds 15 to 25 knots increasing to gales to
40 knots in the afternoon. A slight chance of rain showers by mid
afternoon. Waves building to 10 to 14 feet occasionally to
18 feet.
.TUESDAY NIGHT...East gales to 40 knots. Rain showers. Waves
subsiding to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY...Northeast winds to 30 knots with gale force gusts to
35 knots through early afternoon. Rain showers. Waves building to
9 to 12 feet occasionally to 15 feet, then subsiding to 6 to 9
feet occasionally to 11 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots becoming west 15 to
25 knots after midnight. Rain showers likely through midnight.
Waves subsiding to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding 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 becoming northwest 15 to
25 knots. A chance of rain showers, possibly mixed with snow.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 1 to 3 feet.
.SATURDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ263-160415-
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-
413 PM EDT Mon Apr 15 2024

...GALE WATCH IN EFFECT FROM TUESDAY EVENING THROUGH WEDNESDAY
AFTERNOON...

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots increasing to 30 knots with
a few gale force gusts to 35 knots possible late. Waves building
to 9 to 12 feet occasionally to 15 feet.
.TUESDAY NIGHT...East gales to 35 knots. A chance of rain showers
through midnight, then rain showers after midnight. Waves
subsiding to 6 to 9 feet occasionally to 11 feet, then building
to 10 to 14 feet occasionally to 18 feet.
.WEDNESDAY...East gales to 40 knots. Rain showers. Waves building
to 11 to 15 feet occasionally to 19 feet, then subsiding to 9 to
12 feet occasionally to 15 feet.
.WEDNESDAY NIGHT...East winds 15 to 25 knots veering west 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.
.THURSDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...West winds 15 to 25 knots veering northwest. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
2 to 4 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ264-160415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
413 PM EDT Mon Apr 15 2024

...GALE WATCH IN EFFECT FROM TUESDAY EVENING THROUGH WEDNESDAY
EVENING...

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering north after midnight,
then veering northeast late. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.TUESDAY NIGHT...East winds 20 to 30 knots increasing to gales to
40 knots after midnight. 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 40 knots. Rain showers. Waves building
to 11 to 15 feet occasionally to 19 feet, then subsiding to 9 to
12 feet occasionally to 15 feet.
.WEDNESDAY NIGHT...East winds 20 to 30 knots becoming west 10 to
20 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 20 to 30 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...West winds 15 to 25 knots veering northwest. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing west. Waves
subsiding to 1 to 3 feet.

$$

LSZ265-160415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
413 PM EDT Mon Apr 15 2024

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY
EVENING...

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering north after midnight,
then veering northeast late. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots increasing to 20 to 30 knots.
Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...East winds 20 to 30 knots increasing to gales to
35 knots late. A slight chance of rain showers through midnight,
then rain showers after midnight. Waves building to 8 to 11 feet
occasionally to 14 feet.
.WEDNESDAY...East gales to 35 knots diminishing to 20 to 30 knots
late. 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...East winds 10 to 20 knots veering west after
midnight. Rain showers through midnight, then a chance of rain
showers after midnight. Waves subsiding to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots. Waves subsiding to calm to
2 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots. Waves building to
1 to 3 feet.
.FRIDAY...West winds 20 to 30 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SATURDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ266-160415-
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-
413 PM EDT Mon Apr 15 2024

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY
EVENING...

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering northeast late.
Waves subsiding to calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots increasing to 15 to 25 knots.
Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...East winds 20 to 30 knots increasing to gales to
35 knots after midnight. Rain showers after midnight. Waves
building to 10 to 14 feet occasionally to 18 feet.
.WEDNESDAY...East gales to 40 knots. Rain showers. Waves
subsiding to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY NIGHT...East gales to 35 knots becoming west 10 to
20 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. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.FRIDAY...West winds 20 to 30 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ267-160415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
413 PM EDT Mon Apr 15 2024

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY
EVENING...

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 2 to
4 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering northeast late. Waves
subsiding to calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots late. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots increasing to gales to
35 knots. A chance of rain showers after midnight. Waves building
to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY...East gales to 40 knots veering southeast by mid
afternoon. Rain showers. Waves building to 8 to 11 feet
occasionally to 14 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY NIGHT...Southeast gales to 35 knots diminishing to
15 to 25 knots after midnight. Rain showers. Waves subsiding to
2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots. A chance of rain showers.
Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of rain showers. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...West winds 15 to 25 knots increasing to 20 to 30 knots.
A chance of rain showers, possibly mixed with snow. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Waves subsiding to 2 to 4 feet.

$$

LSZ261-160415-
MAFOR 1521/
Superior West...GALE WARNING IN EFFECT...11400 11300 11200 11210
11220 11230 11240 11250. Waves 1 to 2 feet tonight building to 7
to 10 feet Tuesday.

Superior North Central 12610 11700 11810 11120 12220 11230. Waves
1 to 4 feet.

Superior South Central 11700 12600 11800 11100 11210 12220. Waves
Waves 1 to 4 feet.

Superior East 12720 11710 11810 12110 11210 11110. Waves 1 to 4
feet.

$$

WFO MQT

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

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