Great Lakes Forecast
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FZUS63 KMQT 260803
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
403 AM EDT Tue Mar 26 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 over northeast Iowa this evening will
lift northeast into western Upper Michigan this afternoon and
then into central Lake Superior tonight. The low continues north
through Ontario toward Hudson Bay Wednesday and Wednesday night,
weakening to 29.4 inches. Meanwhile, a 30.2 inch high pressure
builds south into the Plains and Mid Mississippi Valley. These
features remain relatively persistent through Thursday before the
high shifts east Thursday night and Friday over the Upper Great
Lakes while weakening to 30.1 inches. A weak trough of 30.0 inches
from the west will then move across Lake Superior on Saturday.

LSZ162-261615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
403 AM EDT Tue Mar 26 2024 /303 AM CDT Tue Mar 26 2024/

...GALE WARNING IN EFFECT THROUGH THIS AFTERNOON...

.EARLY THIS MORNING...Northeast gales to 45 knots. Rain showers,
possibly mixed with snow. Waves 10 to 14 feet occasionally to
18 feet.
.TODAY...Northeast gales to 40 knots backing north in the
afternoon. Rain showers through early afternoon. Snow showers. A
slight chance of rain showers by mid afternoon. Waves building to
11 to 15 feet occasionally to 19 feet, then subsiding to 5 to
8 feet occasionally to 10 feet.
.TONIGHT...Northwest gales to 35 knots backing west late.
Freezing spray. A chance of snow showers. Waves subsiding to 4 to
8 feet occasionally to 10 feet.
.WEDNESDAY...West winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. Freezing spray. A chance of snow
showers. Waves building to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY NIGHT...West gales to 35 knots diminishing to 20 to
30 knots after midnight. A chance of snow showers. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.THURSDAY...West winds 20 to 30 knots. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots veering northwest
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots backing northeast. A chance
of snow. A chance of rain. Waves building to 1 to 3 feet.
.SATURDAY...Northeast winds 10 to 20 knots. A chance of snow,
possibly mixed with rain. Waves subsiding to calm to 2 feet.

$$

LSZ263-261615-
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-
403 AM EDT Tue Mar 26 2024

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

.EARLY THIS MORNING...Northeast gales to 40 knots. Patchy fog.
Rain showers. Waves 10 to 14 feet occasionally to 18 feet.
.TODAY...Northeast gales to 40 knots becoming north gales to
35 knots late. Rain showers, possibly mixed with snow through
early afternoon, then a chance of rain and snow showers by mid
afternoon. Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.TONIGHT...West gales to 35 knots. Freezing spray. A slight
chance of freezing rain through midnight. A chance of snow
showers. Waves building to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY...West gales to 35 knots. Freezing spray. A chance of
snow showers through early afternoon. Snow showers likely by mid
afternoon. Waves building to 9 to 12 feet occasionally to
15 feet.
.WEDNESDAY NIGHT...West gales to 35 knots diminishing to 20 to
30 knots after midnight. Snow showers likely through midnight,
then a chance of snow showers after midnight. Waves subsiding to
6 to 9 feet occasionally to 11 feet.
.THURSDAY...West winds 20 to 30 knots. A chance of snow showers.
Waves subsiding to 4 to 8 feet occasionally to 10 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...Northwest winds 5 to 15 knots veering northeast. A
chance of snow, possibly mixed with rain. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.SATURDAY...Northeast winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.

$$

LSZ264-261615-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
403 AM EDT Tue Mar 26 2024

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

.EARLY THIS MORNING...Northeast gales to 35 knots. Patchy fog.
Rain showers. Waves 9 to 12 feet occasionally to 15 feet.
.TODAY...East gales to 35 knots becoming southeast 20 to 30 knots
in the afternoon, then veering south late. Patchy fog through
early afternoon. Rain showers through early afternoon, then a
chance of rain showers, possibly mixed with snow by mid
afternoon. Waves subsiding to 8 to 11 feet occasionally to
14 feet, then building to 9 to 12 feet occasionally to 15 feet.
.TONIGHT...Southwest winds 20 to 30 knots becoming west gales to
35 knots after midnight. A chance of rain showers through
midnight. A chance of snow showers. Freezing spray after
midnight. Waves subsiding to 4 to 7 feet occasionally to 9 feet,
then building to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY...West gales to 35 knots. Freezing spray. A chance of
snow showers through early afternoon. Snow showers by mid
afternoon. Waves building to 9 to 12 feet occasionally to
15 feet.
.WEDNESDAY NIGHT...West gales to 35 knots diminishing to 20 to
30 knots after midnight. Freezing spray. Snow showers likely
through midnight. A chance of snow showers after midnight. Waves
subsiding to 6 to 9 feet occasionally to 11 feet.
.THURSDAY...West winds 20 to 30 knots. Freezing spray through
early afternoon. A chance of snow showers. Waves subsiding to
4 to 8 feet occasionally to 10 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 5 to 15 knots veering northeast. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.SATURDAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ265-261615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
403 AM EDT Tue Mar 26 2024

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

.EARLY THIS MORNING...East winds 15 to 25 knots. Patchy fog. Rain
showers. Waves 4 to 7 feet occasionally to 9 feet.
.TODAY...Southeast winds 20 to 30 knots becoming south 15 to
25 knots late. Patchy fog through early afternoon. Rain showers
likely through early afternoon, then a chance of rain showers by
mid afternoon. Waves building to 6 to 9 feet occasionally to
11 feet, then subsiding to 4 to 7 feet occasionally to 9 feet.
.TONIGHT...Southwest winds 20 to 30 knots becoming west gales to
35 knots after midnight. A chance of rain showers through
midnight. A chance of snow showers. Freezing spray after
midnight. Waves subsiding to 3 to 6 feet occasionally to 8 feet,
then building to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY...West gales to 35 knots diminishing to 20 to 30 knots
late. Freezing spray through early afternoon. A chance of snow
showers. Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. Snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Snow showers through early afternoon,
then a chance of snow showers by mid afternoon. Waves subsiding
to 2 to 4 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 10 to 20 knots veering northeast. Waves
calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.

$$

LSZ266-261615-
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-
403 AM EDT Tue Mar 26 2024

...GALE WARNING IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...
...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH WEDNESDAY
EVENING...

.EARLY THIS MORNING...Southeast winds 20 to 30 knots. Patchy fog.
Rain showers. Waves 6 to 10 feet occasionally to 13 feet.
.TODAY...Southeast gales to 35 knots becoming south 20 to
30 knots late. Patchy fog through early afternoon. A chance of
rain showers. Waves building to 9 to 12 feet occasionally to
15 feet, then subsiding to 6 to 9 feet occasionally to 11 feet.
.TONIGHT...South winds 20 to 30 knots becoming southwest gales to
35 knots after midnight, then veering west late. A chance of rain
showers through midnight. A chance of snow showers. Freezing
spray after midnight. Waves subsiding to 5 to 8 feet occasionally
to 10 feet, then building to 9 to 12 feet occasionally to
15 feet.
.WEDNESDAY...West gales to 35 knots. Freezing spray. A chance of
snow showers. Waves 9 to 12 feet occasionally to 15 feet.
.WEDNESDAY NIGHT...West gales to 35 knots diminishing to 20 to
30 knots after midnight. Snow showers. Waves subsiding to 7 to
10 feet occasionally to 13 feet.
.THURSDAY...West winds 15 to 25 knots. A chance of snow showers.
Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 10 to 20 knots veering northeast. Waves
subsiding to 1 to 3 feet.
.SATURDAY...North winds 10 to 20 knots. Waves 1 to 3 feet.

$$

LSZ267-261615-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
403 AM EDT Tue Mar 26 2024

...GALE WARNING IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.EARLY THIS MORNING...Southeast winds 20 to 30 knots. Rain
showers. Waves 5 to 8 feet occasionally to 10 feet.
.TODAY...Southeast gales to 35 knots diminishing to 20 to
30 knots late. Patchy fog through early afternoon. Rain showers
through early afternoon, then a chance of rain showers by mid
afternoon. Waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 5 to 8 feet occasionally to 10 feet.
.TONIGHT...Southeast winds 20 to 30 knots veering southwest after
midnight. A chance of rain and snow showers. Waves subsiding to 3
to 6 feet occasionally to 8 feet, then building to 8 to 11 feet
occasionally to 14 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots veering west in the
afternoon, then backing southwest late. A chance of snow showers.
Waves subsiding to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY NIGHT...Southwest winds 20 to 30 knots veering west
after midnight. A chance of snow showers. Waves subsiding to 6 to
9 feet occasionally to 11 feet, then building to 7 to 10 feet
occasionally to 13 feet.
.THURSDAY...West winds 20 to 30 knots. Snow showers likely
through early afternoon, then a chance of snow showers by mid
afternoon. Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots veering northwest
after midnight. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.FRIDAY...Northwest winds 15 to 25 knots becoming northeast 10 to
20 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...Northeast winds 10 to 20 knots backing north. Waves
building to 1 to 3 feet.

$$

LSZ261-261615-
MAFOR 2609/
Superior West...GALE WARNING IN EFFECT...11166 11167 11157 12857
11741 11740 11650. Waves 11 to 15 feet subsiding to 6 to 9 feet
today. Waves 5 to 8 feet tonight.

Superior North Central...GALE WARNING IN EFFECT...12246 11346
11340 11440 11530 11540 11651. A chance of snow showers tonight.
Waves 8 to 12 feet today. Waves 5 to 9 feet tonight.

Superior South Central...GALE WARNING IN EFFECT...13346 11440
11430 11547 11550 11651. Waves 5 to 8 feet today. Waves 4 to 7
feet building to 6 to 10 feet tonight.

Superior East...GALE WARNING IN EFFECT...11346 12356 11350 11340
11356 11440 11550. A chance of snow showers overnight. Waves 6 to
10 feet today. Waves 5 to 8 feet building to 7 to 10 feet
tonight.

$$

Voss

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

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


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