686
FZUS63 KMQT 121352
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
952 AM EDT Wed Jun 12 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 29.4 inch low pressure system over far northwestern
Ontario shifts east out over James Bay by this evening, dragging
a 29.6 inch trough over Lake Superior tonight through Thursday
morning. 30.1 inch ridging moves into the High Plains late
Thursday into Friday, becoming centered over Lake Superior on
Friday afternoon. This high pressure builds to 30.2 inches and
moves over the central Great Lakes Saturday, and will continue
shifting east toward New England on Sunday as troughing sets up
west of Lake Superior.

LSZ162-122200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
952 AM EDT Wed Jun 12 2024 /852 AM CDT Wed Jun 12 2024/

.REST OF TODAY...Southwest winds 5 to 15 knots becoming south
10 to 20 knots in the afternoon. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering west late. Showers
likely through midnight. A chance of thunderstorms. A slight
chance of showers after midnight. Waves building to 1 to 3 feet.
.THURSDAY...West winds 15 to 25 knots. A slight chance of showers
and thunderstorms. Waves building to 2 to 4 feet, then subsiding
to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...East winds 10 to 20 knots increasing to 15 to
25 knots. Showers likely. Waves building to 1 to 3 feet.
.SUNDAY...East winds 10 to 20 knots veering west. A chance of
showers. Waves subsiding to calm to 2 feet.

$$

LSZ263-122200-
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-
952 AM EDT Wed Jun 12 2024

.REST OF TODAY...Southwest winds 5 to 15 knots increasing to
10 to 20 knots in the afternoon, then backing south late. A
chance of showers. A chance of thunderstorms by mid afternoon.
Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves building
to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots. A slight chance of
thunderstorms through early afternoon. A slight chance of
showers. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots. Showers likely. Waves building to 1 to 3 feet.
.SUNDAY...South winds 10 to 20 knots becoming west 5 to 15 knots.
A chance of showers. Waves building to 2 to 4 feet, then
subsiding to calm to 2 feet.

$$

LSZ264-122200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
952 AM EDT Wed Jun 12 2024

.REST OF TODAY...Southwest winds 5 to 15 knots increasing to
10 to 20 knots in the afternoon, then backing south late. A
chance of showers. A chance of thunderstorms by mid afternoon.
Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest late.
Showers likely through midnight. A chance of thunderstorms. A
chance of showers after midnight. Waves building to 1 to 3 feet.
.THURSDAY...West winds 15 to 25 knots. A slight chance of
thunderstorms through early afternoon. A chance of showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots veering south by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves building to 2 to 4 feet.
.SUNDAY...South winds 10 to 20 knots becoming southwest 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ265-122200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
952 AM EDT Wed Jun 12 2024

.REST OF TODAY...Southwest winds 5 to 15 knots becoming south
10 to 20 knots in the afternoon. A chance of showers and
thunderstorms by mid afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming southwest 15 to 25 knots
late. Showers likely through midnight. A chance of thunderstorms.
A chance of showers after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then veering northwest late. A slight
chance of showers and thunderstorms. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.FRIDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.
.SUNDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ266-122200-
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-
952 AM EDT Wed Jun 12 2024

.REST OF TODAY...Southwest winds 5 to 15 knots backing south in
the afternoon, then becoming southeast 10 to 20 knots late. A
chance of showers and thunderstorms by mid afternoon. Waves calm
to 2 feet.
.TONIGHT...South winds 15 to 25 knots becoming southwest 10 to
20 knots late. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet.
.THURSDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon, then veering northwest late. A slight
chance of showers and thunderstorms. Waves building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots. A chance of showers. Waves building to 2 to 4 feet.
.SUNDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ267-122200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
952 AM EDT Wed Jun 12 2024

.REST OF TODAY...Southwest winds 5 to 15 knots backing south in
the afternoon, then becoming southeast 10 to 20 knots late. A
chance of showers and thunderstorms by mid afternoon. Waves calm
to 2 feet.
.TONIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Showers likely through midnight. A
chance of thunderstorms. A chance of showers after midnight.
Waves building to 1 to 3 feet.
.THURSDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots in the afternoon. A chance of showers and thunderstorms.
Waves building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A slight chance of showers through
midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...Northwest winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves building to 2 to 4 feet.
.SUNDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ261-122200-
MAFOR 1215/
Superior West 11500 12410 11429 11426 11520 11530 11630. Waves 1
to 3 feet this afternoon and tonight. Waves 2 to 4 feet Thursday
morning.

Superior North Central 12520 11420 12426 12520 11630. A chance of
thunderstorms. Waves 1 to 3 feet this afternoon and tonight.
Waves 2 to 4 feet Thursday morning.

Superior South Central 13410 12426 12520 11630. A chance of
thunderstorms. Waves 2 feet or less this afternoon and tonight.
Waves 1 to 3 feet Thursday morning.

Superior East 11410 12310 12426 11420 12520. A chance of
thunderstorms. Waves 1 to 2 feet this afternoon. Waves 1 to 3
feet building to 2 to 4 feet tonight. Waves 2 to 3 feet Thursday
morning.

$$

Thompson

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

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