108
FZUS63 KMQT 211945
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
345 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.

LSZ162-220345-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
345 PM EDT Fri Jun 21 2024 /245 PM CDT Fri Jun 21 2024/

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Isolated
showers. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering east after
midnight, then becoming northeast 10 to 20 knots late. A chance
of showers. Waves 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.

$$

LSZ263-220345-
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-
345 PM EDT Fri Jun 21 2024

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...East winds less than 10 knots increasing to 5 to
15 knots after midnight. A chance of showers. 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.

$$

LSZ264-220345-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
345 PM EDT Fri Jun 21 2024

.LATE THIS AFTERNOON...South winds less than 10 knots. Waves calm
to 2 feet.
.TONIGHT...South winds less than 10 knots becoming east 5 to
15 knots late. A slight chance of 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.

$$

LSZ265-220345-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
345 PM EDT Fri Jun 21 2024

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Scattered
showers. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east late. A
chance of showers. 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.

$$

LSZ266-220345-
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-
345 PM EDT Fri Jun 21 2024

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Scattered
showers. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east late. A
chance of showers. 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.

$$

LSZ267-220345-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
345 PM EDT Fri Jun 21 2024

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Isolated
showers. Waves calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering northeast late.
A chance of showers. Patchy fog 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.

$$

LSZ261-220345-
MAFOR 2121/
Superior West 11200 12100 11210 11110 13120. A chance of showers
Saturday. Waves 1 foot or less tonight. Waves 1 to 3 feet
Saturday.

Superior North Central 13400 11300 11200 12210 11110. Waves 1
foot or less.

Superior South Central 11300 19306 13300 11200 12210 11110. Waves
1 foot or less.

Superior East 12700 11800 14100 11110. A chance of showers
Saturday afternoon. 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