Great Lakes Forecast
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FZUS63 KMQT 290743
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
343 AM EDT Fri Mar 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...Today, a 30.0 inch ridge builds over the lake
associated with a 30.2 inch high over the northern Canadian
Prairie provinces. Tonight, ridging weakens over the lake as a
29.7 inch low approaches the southern portions of the Great Lakes
basin. As the low moves through southern Lake Michigan early
Saturday, an inverted 29.8 inch trough will move through Lake
Superior. 30.0 inch ridge will return Saturday night, then build
to 30.1 inches Sunday night. This ridge will remain over Lake
Superior late weekend into early next week. A deepening low
pressure system moving into the Lower Midwest sometime Monday
night thorough Tuesday will lead to height falls over Lake
Superior, but exact timing and track of this system remains
uncertain.

LSZ162-291545-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
343 AM EDT Fri Mar 29 2024 /243 AM CDT Fri Mar 29 2024/

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...North winds 5 to 15 knots veering east in the afternoon,
then increasing to 10 to 20 knots late. A slight chance of snow
showers by mid afternoon. Waves building to 1 to 3 feet.
.TONIGHT...East winds 10 to 20 knots increasing to 15 to 25 knots
after midnight. A chance of snow through midnight, then snow
likely after midnight. Waves building to 3 to 6 feet occasionally
to 8 feet.
.SATURDAY...East winds 10 to 20 knots backing northeast in the
afternoon, then becoming south 5 to 15 knots late. A chance of
snow. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots. Waves building to
1 to 3 feet.
.MONDAY...Northeast winds 15 to 25 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.TUESDAY...Northeast winds 10 to 20 knots backing north. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ263-291545-
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-
343 AM EDT Fri Mar 29 2024

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...North winds 5 to 15 knots backing northwest in the
afternoon, then veering east late. Waves subsiding to calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. A chance of snow through midnight, then snow
likely after midnight. Waves building to 3 to 5 feet occasionally
to 7 feet.
.SATURDAY...East winds 5 to 15 knots backing north late. Snow
likely through early afternoon, then a slight chance of snow by
mid afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Northeast winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.TUESDAY...Northeast winds 10 to 20 knots becoming north 15 to
25 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.

$$

LSZ264-291545-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
343 AM EDT Fri Mar 29 2024

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves 2 to
4 feet.
.TODAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing west late. Waves
subsiding to calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots. A chance of snow. Waves calm
to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing north late. A chance
of snow. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots veering northeast after
midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 10 to 20 knots. Waves building to 2 to
4 feet.
.TUESDAY...Northeast winds 10 to 20 knots becoming north 15 to
25 knots. Waves building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ265-291545-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
343 AM EDT Fri Mar 29 2024

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Waves 1 to
3 feet.
.TODAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. A chance of snow. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing north late. A chance of
snow. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots backing northeast after
midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 1 to 3 feet.
.TUESDAY...North winds 15 to 25 knots. Waves building to 4 to
7 feet occasionally to 9 feet.

$$

LSZ266-291545-
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-
343 AM EDT Fri Mar 29 2024

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. A slight
chance of snow showers. Waves 3 to 5 feet occasionally to 7 feet.
.TODAY...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to 1 to 3 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering east after
midnight, then increasing to 10 to 20 knots late. A chance of
snow. Waves subsiding to calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then becoming north 10 to 20 knots
late. A chance of snow. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 2 to 4 feet.
.TUESDAY...North winds 15 to 25 knots increasing to 20 to
30 knots. Waves building to 4 to 7 feet occasionally to 9 feet.

$$

LSZ267-291545-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
343 AM EDT Fri Mar 29 2024

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. A slight
chance of snow showers. Waves 3 to 5 feet occasionally to 7 feet.
.TODAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering northeast after
midnight, then becoming east 10 to 20 knots late. A slight chance
of snow after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then becoming north 10 to 20 knots
late. A chance of snow. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 1 to 3 feet.
.TUESDAY...North winds 15 to 25 knots increasing to 20 to
30 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.

$$

LSZ261-291545-
MAFOR 2909/
Superior West 11710 11810 11100 11200 12210 11220 11237. Waves 2
feet or less today. Waves 1 to 3 feet building to 3 to 6 feet
tonight.

Superior North Central 12720 12710 11610 11500 11200 11210. A
chance of snow overnight. Waves 2 to 4 feet subsiding to 1 to 3
feet today. Waves 1 foot or less tonight.

Superior South Central 13720 11710 11800 11200 11310 11210. Waves
2 to 4 feet subsiding to 1 to 3 feet today. Waves 2 feet or less
tonight.

Superior East 14720 11720 11710 11800 11200. Waves 3 to 5 feet
today. Waves 2 to 4 feet subsiding to 1 to 2 feet tonight.

$$

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


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