510
FZUS63 KMQT 190758
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
358 AM EDT Thu Sep 19 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...A 30.0 inch high pressure ridge will hold from Quebec
into the Great Lakes region today. Meanwhile, a 29.3 inch low
pressure over southeast Saskatchewan will track toward Lake
Winnipeg today with its associated 29.6 inch trough sweeping east
into Minnesota. As the low continues to track northeast to Hudson
Bay on Friday, the associated trough will fill to 29.8 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.

LSZ162-191600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
358 AM EDT Thu Sep 19 2024 /258 AM CDT Thu Sep 19 2024/

.EARLY THIS MORNING...Southeast winds 10 to 20 knots. A slight
chance of showers and thunderstorms. Waves calm to 2 feet.
.TODAY...East winds 10 to 20 knots veering southeast late. A
chance of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest late. A
chance of showers and thunderstorms. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.MONDAY...North winds 10 to 20 knots. Waves subsiding to calm to
2 feet.

$$

LSZ263-191600-
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-
358 AM EDT Thu Sep 19 2024

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

$$

LSZ264-191600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
358 AM EDT Thu Sep 19 2024

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon. Waves subsiding to calm to 2 feet,
then building to 2 to 4 feet.
.TONIGHT...Southeast winds 15 to 25 knots veering south after
midnight, then diminishing to 10 to 20 knots late. A chance of
showers and thunderstorms. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...South winds 5 to 15 knots veering southwest in the
afternoon. A slight chance of showers and thunderstorms. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming west
10 to 20 knots after midnight. A chance of showers. Waves calm to
2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.MONDAY...Northwest winds 15 to 25 knots becoming east 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ265-191600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
358 AM EDT Thu Sep 19 2024

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Southeast winds 5 to 15 knots increasing to 15 to
25 knots. Waves building to 2 to 4 feet.
.TONIGHT...Southeast winds 15 to 25 knots veering south after
midnight, then diminishing to 10 to 20 knots late. A chance of
showers and thunderstorms. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots becoming west 5 to 15 knots
late. A chance of showers and thunderstorms. Waves subsiding to
calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots. A slight chance of
showers through midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots backing southeast by
mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots veering east. A chance of
showers. Waves calm to 2 feet.

$$

LSZ266-191600-
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-
358 AM EDT Thu Sep 19 2024

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves 1 to
3 feet.
.TODAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon. Waves building to 2 to 4 feet.
.TONIGHT...South winds 15 to 25 knots. A slight chance of showers
through midnight. A chance of thunderstorms. Showers likely after
midnight. Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...South winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of showers and a slight chance of
thunderstorms. Waves subsiding to calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.MONDAY...North winds 10 to 20 knots veering east. A chance of
showers. Waves subsiding to calm to 2 feet.

$$

LSZ267-191600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
358 AM EDT Thu Sep 19 2024

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then veering south late. Waves calm to
2 feet.
.TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then becoming south 10 to 20 knots late.
A chance of showers and a slight chance of thunderstorms after
midnight. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.FRIDAY...Southeast winds 10 to 20 knots. Showers likely through
early afternoon. A chance of thunderstorms. A chance of showers
by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots. Showers likely through
midnight. A slight chance of thunderstorms. A chance of showers
after midnight. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet.
.MONDAY...North winds 10 to 20 knots veering east. A chance of
showers. Waves subsiding to calm to 2 feet.

$$

LSZ261-191600-
MAFOR 1909/
Superior West 11410 14310 13420. A chance of showers and
thunderstorms tonight. Waves 1 to 3 feet.

Superior North Central 12410 12320 12330 11430 11436. A chance of
thunderstorms tonight. Waves 1 to 4 feet today and 3 to 6 feet
tonight.

Superior South Central 12410 11320 13330 11420 11426. A chance of
thunderstorms overnight. Waves 1 to 3 feet today and 2 to 5 feet
tonight.

Superior East 11410 14310 11420 11320 11420. A chance of showers
overnight. Waves 1 to 4 feet.


$$

Rolfson

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

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