Great Lakes Forecast
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FZUS63 KMQT 260203
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1003 PM EDT Mon Mar 25 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 29.4 inch low over Iowa this evening will continue
lifting into Wisconsin tonight as it deepens to 29.3 inches. The
low crosses northeast over Upper Michigan on Tuesday and then Lake
Superior Tuesday night. The low continues north 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, weakening to 30.1
inches by Friday night.

LSZ162-261015-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1003 PM EDT Mon Mar 25 2024 /903 PM CDT Mon Mar 25 2024/

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

.REST OF TONIGHT...Northeast gales to 40 knots. Rain showers,
possibly mixed with snow and sleet. Waves 9 to 12 feet
occasionally to 15 feet building to 10 to 14 feet occasionally to
18 feet.
.TUESDAY...Northeast gales to 40 knots becoming northwest winds 20
to 30 knots late. A slight chance of sleet through early
afternoon. Rain showers, possibly mixed with snow. Waves subsiding
to 5 to 8 feet occasionally to 10 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots backing west
after midnight. Freezing spray. A chance of snow showers. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...West gales to 35 knots. Freezing spray through early
afternoon. A chance of snow showers. Waves building to 6 to
9 feet occasionally to 11 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. A chance of snow
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 15 to 25 knots. A chance of snow showers.
Waves subsiding to 2 to 4 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 becoming northeast 15 to
25 knots. A chance of snow showers. Waves building to 2 to
4 feet.
.SATURDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ263-261015-
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-
1003 PM EDT Mon Mar 25 2024

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

.REST OF TONIGHT...Northeast gales to 45 knots. A slight chance
of snow showers. Rain showers. Waves 8 to 11 feet occasionally to
14 feet building to 9 to 12 feet occasionally to 15 feet.
.TUESDAY...Northeast gales to 35 knots backing northwest late.
Snow showers, possibly mixed with sleet through early afternoon.
Rain showers. A chance of snow showers by mid afternoon. Waves
building to 10 to 14 feet occasionally to 18 feet, then subsiding
to 6 to 9 feet occasionally to 11 feet.
.TUESDAY NIGHT...West gales to 35 knots. Freezing spray. A chance
of rain showers and freezing rain through midnight. A chance of
snow showers. Waves subsiding to 5 to 8 feet occasionally to
10 feet, then building to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY...West gales to 40 knots. Freezing spray through early
afternoon. A chance of snow showers through early afternoon, then
snow showers likely by mid afternoon. Waves building to 8 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 5 to
8 feet occasionally to 10 feet.
.THURSDAY...West winds 20 to 30 knots. Snow showers likely
through early afternoon. 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 1 to 3 feet.
.FRIDAY...Northwest winds 5 to 15 knots becoming east 10 to
20 knots. A chance of snow showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.SATURDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.

$$

LSZ264-261015-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1003 PM EDT Mon Mar 25 2024

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

.REST OF TONIGHT...East gales to 40 knots. Patchy dense fog. A
slight chance of snow showers. Rain showers. Waves 8 to 11 feet
occasionally to 14 feet building to 10 to 14 feet occasionally to
18 feet.
.TUESDAY...East winds 20 to 30 knots veering southeast in the
afternoon. Rain showers through early afternoon. A slight chance
of snow showers. A chance of rain showers by mid afternoon. Waves
subsiding to 8 to 11 feet occasionally to 14 feet.
.TUESDAY NIGHT...West gales to 35 knots. A chance of rain showers
through midnight. A chance of snow showers. Freezing spray after
midnight. Waves subsiding to 6 to 9 feet occasionally to 11 feet,
then building to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY...West gales to 40 knots. Freezing spray. Snow showers
likely. 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. Freezing spray after
midnight. Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.THURSDAY...West winds 20 to 30 knots. Freezing spray through
early afternoon. 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 becoming northwest
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 backing north. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.

$$

LSZ265-261015-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1003 PM EDT Mon Mar 25 2024

.REST OF TONIGHT...East winds 15 to 25 knots veering southeast
after midnight, then increasing to 20 to 30 knots late. Rain
showers. Waves 5 to 9 feet occasionally to 11 feet, then building
to 7 to 10 feet occasionally to 13 feet.
.TUESDAY...Southeast winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Rain showers through early afternoon,
then a chance of rain showers by mid afternoon. Waves subsiding
to 4 to 7 feet occasionally to 9 feet.
.TUESDAY NIGHT...West winds 20 to 30 knots increasing to 30 knots
with a few gale force gusts to 35 knots possible 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 5 to 8 feet
occasionally to 10 feet.
.WEDNESDAY...West winds 20 to 30 knots. Snow showers likely
through early afternoon, then a chance of snow showers by mid
afternoon. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. Snow showers
likely. Waves 3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Snow showers likely 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 veering northwest
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 10 to 20 knots veering northeast. Waves
calm to 2 feet.
.SATURDAY...Northeast winds 10 to 20 knots backing north. Waves
building to 1 to 3 feet.

$$

LSZ266-261015-
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-
1003 PM EDT Mon Mar 25 2024

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

.REST OF TONIGHT...Southeast winds 20 to 30 knots increasing to
gales to 35 knots. Rain showers. Waves 7 to 10 feet occasionally
to 13 feet building to 9 to 12 feet occasionally to 15 feet.
.TUESDAY...Southeast gales to 35 knots diminishing to 20 to
30 knots late. A chance of rain showers. Waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 8 to 11 feet
occasionally to 14 feet.
.TUESDAY NIGHT...West winds 20 to 30 knots increasing to gales to
35 knots after midnight. A chance of rain showers through
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.
.WEDNESDAY...West winds 20 to 30 knots. Snow showers likely.
Waves subsiding to 6 to 9 feet occasionally to 11 feet, then
building to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. Snow showers. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. 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 2 to 4 feet.
.FRIDAY...Northwest winds 15 to 25 knots becoming northeast 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SATURDAY...Northeast winds 10 to 20 knots becoming north 15 to
25 knots. Waves 1 to 3 feet.

$$

LSZ267-261015-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1003 PM EDT Mon Mar 25 2024

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

.REST OF TONIGHT...Southeast winds 20 to 30 knots increasing to
gales to 35 knots. A chance of rain showers by late evening, then
rain showers after midnight. Waves 6 to 9 feet occasionally to 11
feet building to 7 to 10 feet occasionally to 13 feet.
.TUESDAY...Southeast gales to 35 knots diminishing to 20 to
30 knots late. Rain showers likely through early afternoon, then
a chance of rain showers by mid afternoon. Waves building to 9 to
12 feet occasionally to 15 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.
.TUESDAY NIGHT...South winds 20 to 30 knots veering west after
midnight, then increasing to gales to 35 knots late. A chance of
snow showers through midnight. A chance of rain showers. Snow
showers likely after midnight. Waves subsiding to 4 to 7 feet
occasionally to 9 feet, then building to 7 to 10 feet
occasionally to 13 feet.
.WEDNESDAY...West winds 20 to 30 knots. Snow showers likely.
Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Snow showers likely. Waves subsiding to
4 to 8 feet occasionally to 10 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 north 10 to
20 knots. Waves subsiding to 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.

$$
LSZ261-261015-
MAFOR 2603/
Superior West...GALE WARNING IN EFFECT...14156 11157 11857 11750
11740. Waves 9 to 13 feet overnight subsiding to 5 to 8 feet by
Tuesday evening.

Superior North Central...GALE WARNING IN EFFECT...13256 12346
11340 11430 11640. A chance of snow showers Tuesday evening.
Waves 8 to 12 feet overnight. Waves 10 to 14 feet Tuesday
subsiding to 6 to 9 feet Tuesday evening.

Superior South Central...GALE WARNING IN EFFECT...11336 14346
11330 11440 11640. A chance of snow showers Tuesday evening.
Waves 5 to 9 feet overnight and Tuesday subsiding to 3 to 6 feet
Tuesday evening.

Superior East...GALE WARNING IN EFFECT...14356 11356 12340 11346.
Waves 6 to 10 feet overnight. Waves 8 to 12 feet Tuesday. Waves 6
to 9 feet Tuesday evening.

$$

Jablonski

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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