275
FZUS63 KMQT 191940
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
340 PM EDT Sat Oct 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... High pressure of 30.5 inches over much of the
eastern U.S. will continue expanding westward through today. This
has brought ridging of 30.3 inches over eastern Lake Superior this
morning, with the ridging continuing until this evening. Weak
29.9 inch troughing skirts Lake Superior Sunday while a 29.6 inch
low organizes over Alberta before beginning its eastward push
Sunday night. This low moves through the Canadian Prairies Monday
before dragging troughing of around 29.7 inches over Lake Superior
Tuesday. A 30.3 inch high pressure approaches from the High
Plains Wednesday into Thursday, bringing ridging of at least 30.1
inches back over Lake Superior for the same time period.

LSZ162-200345-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
340 PM EDT Sat Oct 19 2024 /240 PM CDT Sat Oct 19 2024/

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. A slight
chance of showers. Waves calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight, then backing southwest late. Waves building to 1 to
3 feet.
.SUNDAY...Southwest winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. Waves building to 1 to 3 feet.
.TUESDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of showers by mid afternoon.
Waves building to 2 to 4 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots becoming northwest
20 to 30 knots after midnight. Showers likely through midnight,
then a chance of showers after midnight. Waves building to 3 to
5 feet occasionally to 7 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to calm to
2 feet.
.THURSDAY...Southwest winds 10 to 20 knots. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ263-200345-
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-
340 PM EDT Sat Oct 19 2024

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight, then backing southwest late. Waves building to 2 to
4 feet.
.SUNDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...Southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight, then diminishing to 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves building to 1 to 3 feet.
.TUESDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of showers by mid afternoon.
Waves building to 2 to 4 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots veering northwest
after midnight. Rain showers likely through midnight, then a
chance of rain showers after midnight. Waves building to 3 to
6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to 1 to
3 feet.
.THURSDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-200345-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
340 PM EDT Sat Oct 19 2024

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight. Waves building to 2 to 4 feet.
.SUNDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...West winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to 1 to 3 feet.
.MONDAY...East winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves building to 1 to 3 feet.
.TUESDAY...Southwest winds 15 to 25 knots. A chance of showers by
mid afternoon. Waves building to 3 to 5 feet occasionally to
7 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots becoming northwest
20 to 30 knots after midnight. Rain showers through midnight,
then a chance of rain showers after midnight. Waves building to
4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to 1 to
3 feet.
.THURSDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-200345-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
340 PM EDT Sat Oct 19 2024

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots becoming west 10 to 20 knots
after midnight. A slight chance of showers through midnight.
Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight, then diminishing to 5 to 15 knots late. Waves building
to 1 to 3 feet, then subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots becoming northwest
20 to 30 knots after midnight. Showers through midnight, then a
chance of showers after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Rain showers, then a chance of rain showers. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
1 to 3 feet.
.THURSDAY...West winds 10 to 20 knots backing southwest. Waves
subsiding to calm to 2 feet.

$$

LSZ266-200345-
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-
340 PM EDT Sat Oct 19 2024

.LATE THIS AFTERNOON...South winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering west late. A slight
chance of showers through midnight. Waves building to 2 to
4 feet.
.SUNDAY...Southwest winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.SUNDAY NIGHT...Southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight, then diminishing to 5 to 15 knots
late. Waves subsiding to 1 to 3 feet.
.MONDAY...East winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots. Waves building to
1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY NIGHT...Southwest winds 15 to 25 knots becoming
northwest 20 to 30 knots after midnight. Showers. Waves building
to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Rain showers, then a chance of rain showers. Waves
subsiding to 2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots backing southwest. Waves
subsiding to calm to 2 feet.

$$

LSZ267-200345-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
340 PM EDT Sat Oct 19 2024

.LATE THIS AFTERNOON...South winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.TONIGHT...South winds 15 to 25 knots veering southwest after
midnight, then diminishing to 10 to 20 knots late. A chance of
showers through midnight. Waves building to 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. Waves building to 1 to 3 feet.
.MONDAY...East winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots. Waves building to
1 to 3 feet.
.TUESDAY...South winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots veering northwest
after midnight. A chance of showers through midnight, then
showers after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots knots becoming north
15 to 25 knots. Rain showers, then a chance of rain showers. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots backing southwest. Waves
subsiding to calm to 2 feet.

$$

LSZ261-200345-
MAFOR 1921/
Superior West 11510 12520 11530 11520 13530. A chance of showers
early this evening. Waves 1 to 3 feet tonight building to 3 to 5
feet Sunday.

Superior North Central 11510 12520 12630 11530 12540. A chance of
showers this evening. Waves 1 to 3 feet building to 2 to 4 feet
tonight, then building to 4 to 7 feet Sunday.

Superior South Central 11310 11410 11510 12620 13520. A chance of
showers early this evening. Waves 1 to 3 feet.

Superior East 11410 11420 13520 13510. A chance of showers this
evening. Waves 1 to 3 feet.

$$

BW

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

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