520
FZUS63 KMQT 200743
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
343 AM EDT Fri Sep 20 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...As a 29.3 inch low continues to track northeast to
Hudson Bay today, the associated trough will fill to 29.7 inches
as it moves over western Lake Superior. This trough will then
dissipate, allowing weak 29.9 inch ridging to anchor over the
Upper Great Lakes on Saturday morning. A new low pressure of 29.6
inches over southern Manitoba Saturday morning will then track
across far northern Ontario Saturday afternoon and night. Its
associated 29.9 inch trough will sweep across Lake Superior during
Saturday night and Sunday morning. In its wake, 30.1 inch high
pressure will build from the Northern Plains into northern Ontario
during Sunday and Monday. Also on Monday, a 29.7 inch low
pressure will track northeast to southern Wisconsin. 30.0 inch
high pressure builds over the Lower MS Valley Tuesday.

LSZ162-201545-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
343 AM EDT Fri Sep 20 2024 /243 AM CDT Fri Sep 20 2024/

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. Waves building to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest late. Waves
subsiding to calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing northeast late. A
slight chance of showers. A slight chance of thunderstorms by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots becoming northwest
15 to 25 knots after midnight. A chance of showers and
thunderstorms through midnight. Waves building to 1 to 3 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves calm to 2 feet.
.MONDAY...East winds 10 to 20 knots diminishing to 5 to 15 knots.
Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.

$$

LSZ263-201545-
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 Sep 20 2024

.EARLY THIS MORNING...South winds 10 to 20 knots. A chance of
showers and a slight chance of thunderstorms. Waves 2 to 4 feet
subsiding to 1 to 3 feet.
.TODAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots late. Waves building to 2 to 4 feet.
.TONIGHT...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.SATURDAY...South winds less than 10 knots becoming southeast
5 to 15 knots in the afternoon, then backing east late. A slight
chance of showers and thunderstorms by mid afternoon. Waves calm
to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots veering northwest
after midnight. A chance of showers and thunderstorms. Waves
building to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...North winds 10 to 20 knots becoming east 5 to 15 knots.
Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.

$$

LSZ264-201545-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
343 AM EDT Fri Sep 20 2024

.EARLY THIS MORNING...South winds 10 to 20 knots. Showers likely
and a chance of thunderstorms. Waves 3 to 6 feet occasionally to
8 feet.
.TODAY...South winds 10 to 20 knots veering southwest in the
afternoon. A slight chance of showers and thunderstorms through
early afternoon. Waves subsiding to 1 to 3 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering northwest late.
Waves subsiding to calm to 2 feet.
.SATURDAY...West winds less than 10 knots becoming south 5 to
15 knots in the afternoon, then backing southeast late. A slight
chance of showers by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering northwest
after midnight. A chance of showers and a slight chance of
thunderstorms. Waves building to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...North winds 10 to 20 knots becoming east 5 to 15 knots.
Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering southwest. Waves calm
to 2 feet.

$$

LSZ265-201545-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
343 AM EDT Fri Sep 20 2024

.EARLY THIS MORNING...South winds 15 to 25 knots. A chance of
showers and thunderstorms. Waves 2 to 4 feet subsiding to 1 to
3 feet.
.TODAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
late. A slight chance of showers and thunderstorms. Waves
subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering west after
midnight. A chance of showers and a slight chance of
thunderstorms. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots veering northeast. Waves
calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots backing west. Waves
calm to 2 feet.

$$

LSZ266-201545-
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 Sep 20 2024

.EARLY THIS MORNING...South winds 15 to 25 knots. Showers likely
and a chance of thunderstorms. Waves 3 to 6 feet occasionally to
8 feet.
.TODAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
late. A chance of showers and thunderstorms. Waves subsiding to
1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots veering west late. A slight
chance of showers and thunderstorms through midnight. Patchy fog
after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southeast late.
Patchy dense fog through early afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering west after
midnight. A chance of showers and thunderstorms. Waves building
to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...North winds 10 to 20 knots veering northeast. Waves
subsiding to calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots backing west. Waves
calm to 2 feet.

$$

LSZ267-201545-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
343 AM EDT Fri Sep 20 2024

.EARLY THIS MORNING...South winds 10 to 20 knots. A chance of
showers and a slight chance of thunderstorms. Waves 1 to 3 feet.
.TODAY...Southeast winds 10 to 20 knots veering south late.
Showers likely through early afternoon. A chance of
thunderstorms. A chance of showers by mid afternoon. Waves
subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots. A chance of showers and a
slight chance of thunderstorms. Patchy fog after midnight. Waves
calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing east late. Patchy
fog through early afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots. A chance of
showers. A slight chance of thunderstorms after midnight. Waves
calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Showers likely through
early afternoon. A chance of thunderstorms. A chance of showers
by mid afternoon. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. A chance of showers. Waves subsiding to 1 to
3 feet.
.MONDAY...North winds 10 to 20 knots veering northeast. A chance
of showers. Waves subsiding to calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots backing northwest. A
chance of showers. Waves calm to 2 feet.

$$

LSZ261-201545-
MAFOR 2009/
Superior West 13520 12530 11610 11510 11610. Waves 1 to 3 feet.

Superior North Central 11436 12420 12520 12510 11610. A chance of
thunderstorms this morning. Waves 3 to 5 feet subsiding to 1 to 3
feet today through tonight.

Superior South Central 12420 11410 12300 13600. A chance of
showers and thunderstorms this morning. Waves 1 to 3 feet today.
Waves 1 foot or less tonight.

Superior East 13326 11310 12410 11400 11500. A chance of
thunderstorms today. Waves 1 to 3 feet.

$$

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