175
FZUS63 KMQT 220131
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
931 PM EDT Fri Jun 21 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... High pressure of 30.1 inches resides over Lake
Superior this evening. On Saturday, the high will transition to
ridging of 30.0 inches extending from northern Ontario across
southern Quebec. Meanwhile, a 29.7 low pressure developing over
eastern Colorado today will track northeast to Wisconsin by
Saturday evening. As the low passes near the Straits of Mackinac
Saturday night and reaches southern Quebec on Sunday, it will
deepen to 29.5 inches. In its wake, 29.9 inch high pressure
building into the Northern Plains on Sunday will settle over the
western Great Lakes region on Monday and then the Appalachians on
Tuesday. Back to the northwest, 29.3 inch low pressure over
Manitoba Monday night will track east toward James Bay on Tuesday,
pushing an associated 29.6 inch trough across Lake Superior
through Tuesday night. 29.9 inch high pressure extends into the
Upper Great Lakes Wednesday from the High Plains


LSZ162-220945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
931 PM EDT Fri Jun 21 2024 /831 PM CDT Fri Jun 21 2024/

.REST OF TONIGHT...Northeast winds 5 to 15 knots veering east
after midnight, then becoming northeast 10 to 20 knots late.
Scattered showers. Waves calm to 2 feet building to 1 to 3 feet.
.SATURDAY...Northeast winds 15 to 25 knots. A chance of showers.
A slight chance of thunderstorms by mid afternoon. Waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet.
.SATURDAY NIGHT...Northeast winds 10 to 20 knots becoming north
5 to 15 knots after midnight, then backing west late. A slight
chance of thunderstorms through midnight. A chance of showers.
Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming east 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots veering southwest after
midnight. A chance of showers through midnight. A chance of
thunderstorms. Showers likely after midnight. Waves calm to
2 feet.
.TUESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ263-220945-
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-
931 PM EDT Fri Jun 21 2024

.REST OF TONIGHT...East winds less than 10 knots increasing to
5 to 15 knots after midnight. Isolated showers after midnight.
Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A chance of showers. Waves building to
1 to 3 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing northwest
late. A chance of showers. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. A chance of showers and a
slight chance of thunderstorms. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. A chance of showers through
midnight, then showers likely and a chance of thunderstorms after
midnight. Waves building to 1 to 3 feet.
.TUESDAY...Southwest winds 15 to 25 knots veering west. A chance
of showers and thunderstorms. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-220945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
931 PM EDT Fri Jun 21 2024

.REST OF TONIGHT...South winds less than 10 knots becoming east
5 to 15 knots late. Isolated showers after midnight. Waves calm
to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing northeast late. A
slight chance of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. A chance of showers. Waves calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. A slight chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. A chance of showers. Waves
building to 1 to 3 feet.
.TUESDAY...Southwest winds 15 to 25 knots veering west. A chance
of showers. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.

$$

LSZ265-220945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
931 PM EDT Fri Jun 21 2024

.REST OF TONIGHT...Southeast winds 5 to 15 knots backing east
late. Scattered showers after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots backing northeast late. A
chance of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 10 to 20 knots backing
northwest late. Showers likely through midnight, then a chance of
showers after midnight. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.TUESDAY...West winds 15 to 25 knots. A chance of showers. Waves
calm to 2 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ266-220945-
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-
931 PM EDT Fri Jun 21 2024

.REST OF TONIGHT...South winds 5 to 15 knots backing east late.
Isolated showers after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots backing northeast in the
afternoon. A chance of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 10 to 20 knots becoming north
15 to 25 knots after midnight, then increasing to 20 to 30 knots
late. Patchy fog through midnight. A chance of showers. Waves
building to 1 to 3 feet.
.SUNDAY...Northwest winds 10 to 20 knots. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves 1 to
3 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers after midnight.
Waves building to 2 to 4 feet.
.TUESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-220945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
931 PM EDT Fri Jun 21 2024

.REST OF TONIGHT...Northwest winds 5 to 15 knots veering
northeast late. Patchy fog after midnight. Isolated showers after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing northeast in the
afternoon, then increasing to 10 to 20 knots late. A chance of
showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight, then backing north late. Patchy
fog through midnight. Showers likely. Waves building to 1 to
3 feet.
.SUNDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers after midnight. Waves
building to 1 to 3 feet.
.TUESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. A chance of showers and thunderstorms. Waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots veering north. Waves
subsiding to calm to 2 feet.

$$
LSZ261-220945-
MAFOR 2203/
Superior West 11100 11210 11110 19116 14120 11120. Waves 1 foot
or less overnight. Waves 1 to 3 feet Saturday and Saturday
evening.

Superior North Central 11400 11300 11200 12210 13110. A chance of
showers Saturday evening. Waves 1 foot or less.

Superior South Central 12300 11200 19206 12210 11110 11116 11126.
Waves 1 foot or less.

Superior East 11800 14100 12110 11120. A chance of showers
Saturday and Saturday evening. Waves 1 foot or less.

$$

BW

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

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