345
FZUS63 KMQT 161950
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
350 PM EDT Mon Sep 16 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 at 30.3 inches remains anchored offshore
of New England, extending 30.0 inch ridging across the Great
Lakes through Wednesday. Meanwhile, a 29.8 inch low drifts
northeast across northern Ontario on Tuesday, reaching northern
Quebec by Wednesday morning. At the same time, a 29.4 inch trough
emerges from the western Plains on Tuesday. Low pressure of 29.3
inches developing along this trough Tuesday night and Wednesday
will lift into Saskatchewan Wednesday night. As the low drifts
northeast to Manitoba on Thursday, an associated 29.7 inch trough
will progress across the Dakotas. As the low continues to track
northeast to Hudson Bay on Friday, the associated trough will
reach western Lake Superior and then dissipate. Meanwhile, weak
29.9 to 30.0 inch ridging extends from northern Quebec into the
Great Lakes region on Thursday and Friday. High pressure ridging
looks to rise to 30.1 inches over the Great Lakes on Saturday.

LSZ162-170400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
350 PM EDT Mon Sep 16 2024 /250 PM CDT Mon Sep 16 2024/

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Isolated showers
and thunderstorms. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight.
Patchy fog through midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing east late. Waves
calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots. A slight chance of
showers. A slight chance of thunderstorms after midnight. Waves
calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Showers likely. Waves calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming northeast 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ263-170400-
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-
350 PM EDT Mon Sep 16 2024

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight. A slight chance of showers and thunderstorms through
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots. A slight chance of
showers and thunderstorms. Waves calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots veering southwest. A chance
of showers. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots backing southeast. A
chance of showers. Waves calm to 2 feet.

$$

LSZ264-170400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
350 PM EDT Mon Sep 16 2024

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight. A slight chance of showers and thunderstorms. Waves
calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering southwest
late. A slight chance of showers. A slight chance of
thunderstorms after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. Waves building to 1 to 3 feet.
.FRIDAY...South winds 5 to 15 knots. A chance of showers. Waves
subsiding to calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots backing southeast. A chance
of showers. Waves calm to 2 feet.

$$

LSZ265-170400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
350 PM EDT Mon Sep 16 2024

.LATE THIS AFTERNOON...East winds 5 to 15 knots. A chance of
showers and isolated thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight. A slight chance of showers and thunderstorms through
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots becoming southwest
5 to 15 knots late. Waves building to 1 to 3 feet, then subsiding
to calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots becoming south 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ266-170400-
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-
350 PM EDT Mon Sep 16 2024

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Scattered
showers and isolated thunderstorms. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots. A slight chance of showers
and thunderstorms. Waves building to 1 to 3 feet.
.TUESDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves subsiding to calm to 2 feet, then building to 1 to 3
feet.
.TUESDAY NIGHT...South winds 10 to 20 knots. A slight chance of
showers after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.WEDNESDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots. A chance of showers. Waves calm to 2 feet.

$$

LSZ267-170400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
350 PM EDT Mon Sep 16 2024

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to 15
knots. Waves building to 1 to 3 feet, then subsiding to calm to 2
feet.
.WEDNESDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ261-170400-
MAFOR 1621/
Superior West 12300 14410 11410 11400. Waves 2 feet or less.

Superior North Central 11410 11300 15410. Waves 2 feet or less.

Superior South Central 11300 11310 15410. A chance of showers
this evening. Waves 2 feet or less.

Superior East 11300 11310 15410. Waves 1 to 3 feet.

$$

Jablonski

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

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