971
FZUS63 KMQT 081959
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
359 PM EDT Wed May 8 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 29.5 inch low pressure over Lake Ontario continues
to track east this afternoon, reaching New England this evening.
Meanwhile, as a 30.3 inch high pressure over Hudson Bay builds
into far northern Ontario tonight, a 29.5 inch low pressure over
Oklahoma will move to the Ohio Valley. During Thursday, the high
over far northern Ontario will weaken to a 30.0 inch ridge
extending from James Bay across western Lake Superior. This ridge
will remain nearly stationary on Thursday night. As the ridge
weakens to 29.8 inches while drifting east on Friday, a 29.7 inch
trough will drop southeast, crossing Lake Superior during Friday
night. In its wake, a 29.9 inch ridge will shift southeast,
crossing Lake Superior late Saturday afternoon and Saturday night.
On Sunday, a 29.5 inch low pressure will track east to southern
Hudson Bay. This low will push an associated 29.7 inch trough
across Lake Superior during Sunday afternoon and Sunday night. In
its wake, 30.1 inch high pressure will build into northern Ontario
on Monday.


LSZ162-090400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
359 PM EDT Wed May 8 2024 /259 PM CDT Wed May 8 2024/

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

$$

LSZ263-090400-
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-
359 PM EDT Wed May 8 2024

.LATE THIS AFTERNOON...East winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Northeast winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Northeast winds 10 to 20 knots backing north late.
Waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots. A chance of rain
showers by mid afternoon. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing southwest by
mid afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots becoming northwest 5 to
15 knots. A chance of rain showers. Waves subsiding to calm to
2 feet.
.MONDAY...Northwest winds 5 to 15 knots veering east. Waves calm
to 2 feet.

$$

LSZ264-090400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
359 PM EDT Wed May 8 2024

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

$$

LSZ265-090400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
359 PM EDT Wed May 8 2024

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...North winds 10 to 20 knots veering northeast after
midnight, then increasing to 15 to 25 knots late. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.THURSDAY...Northeast winds 10 to 20 knots backing north in the
afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight, then backing west late. Waves
subsiding to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots veering northwest
after midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 15 to 25 knots becoming west 10 to
20 knots. A chance of rain showers. Waves calm to 2 feet.
.MONDAY...Northwest winds 10 to 20 knots backing south. Waves
calm to 2 feet.

$$

LSZ266-090400-
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-
359 PM EDT Wed May 8 2024

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...North winds 15 to 25 knots veering northeast after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Northeast winds 10 to 20 knots backing north in the
afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots becoming south 10 to
20 knots after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 15 to 25 knots becoming northwest 10 to
20 knots. A chance of rain showers. Waves building to 1 to
3 feet.
.MONDAY...Northwest winds 10 to 20 knots backing southwest. Waves
subsiding to calm to 2 feet.

$$

LSZ267-090400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
359 PM EDT Wed May 8 2024

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...North winds 15 to 25 knots veering northeast after
midnight, then diminishing to 10 to 20 knots late. Waves building
to 2 to 4 feet.
.THURSDAY...Northeast winds 10 to 20 knots backing north in the
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.FRIDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots backing south after
midnight. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots veering southwest. A chance
of rain showers. Waves calm to 2 feet.
.MONDAY...Northwest winds 10 to 20 knots backing west. Waves calm
to 2 feet.

$$

LSZ261-090400-
MAFOR 0821/
Superior West 11230 11120 14130 12120. Waves 3 to 5 feet
tonight subsiding to 2 to 3 feet Thursday.

Superior North Central 11120 13130 13120 11820. Waves 2 to 4 feet
subsiding to 1 to 3 feet, then building to 3 to 5 feet tonight.
Waves 2 to 4 feet subsiding to 1 to 3 feet Thursday.

Superior South Central 11810 12820 13120 11110 11810. Waves 2 to
4 feet tonight. Waves 3 to 5 feet subsiding to 2 to 4 feet
Thursday.

Superior East 12820 11130 13120 12810. Waves 1 to 3 feet building
to 2 to 4 feet tonight then subsiding to 1 to 3 feet Thursday.

$$

BW

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

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