730
FZUS63 KMQT 121405
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1005 AM EDT Sun May 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 over far northern Ontario
will weaken to 29.5 inches as it tracks to James Bay by mid-morning
on Monday. An associated 29.6 inch trough will move across Lake
Superior during this afternoon and tonight. In its wake, 30.3 inch
high pressure over Hudson Bay will extend a 29.9 inch ridge into the
Northern Plains and Upper Mississippi Valley on Monday. This ridge
will build to 30.0 inches as it drifts across Lake Superior during
Tuesday and Wednesday and then moves to Quebec and the Lower
Great Lakes on Thursday. Meanwhile, a 29.7 inch trough emerging
over the western Plains on Tuesday will weaken to 29.8 inches as
it shifts to the Upper Mississippi Valley during Wednesday night
and Thursday.

LSZ162-122215-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1005 AM EDT Sun May 12 2024 /905 AM CDT Sun May 12 2024/

.REST OF TODAY...Southwest winds 10 to 20 knots veering west
late. Isolated showers and thunderstorms through late morning.
Haze by mid afternoon. Waves 1 to 3 feet subsiding to calm to 2
feet, then building to 1 to 3 feet.
.TONIGHT...Northwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then veering north late. Haze. Waves
subsiding to calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering south in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots veering east by mid
afternoon. Waves building to 2 to 4 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots backing northeast. A
chance of rain showers. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots backing northeast. A chance
of rain showers. Waves calm to 2 feet.

$$

LSZ263-122215-
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-
1005 AM EDT Sun May 12 2024

.REST OF TODAY...Southwest winds 10 to 20 knots veering west in
the afternoon, then diminishing to 5 to 15 knots late. Isolated
showers and thunderstorms through late morning. Haze by mid
afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TONIGHT...Northwest winds 5 to 15 knots becoming north 10 to
20 knots late. Haze through midnight. Waves subsiding to calm to
2 feet.
.MONDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then veering south late. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots. A chance of rain showers.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots veering south. A chance
of rain showers. Waves calm to 2 feet.

$$

LSZ264-122215-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1005 AM EDT Sun May 12 2024

.REST OF TODAY...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots late. Isolated rain showers through early afternoon.
Waves 3 to 5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...West winds 5 to 15 knots veering north after midnight,
then increasing to 10 to 20 knots late. Haze through midnight.
Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.
.MONDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon, then backing west late. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering southeast. A chance
of rain showers. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots veering south. A chance
of rain showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.

$$

LSZ265-122215-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1005 AM EDT Sun May 12 2024

.REST OF TODAY...South winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then becoming west 5 to 15 knots late.
Scattered showers and isolated thunderstorms. Waves 2 to 4 feet
subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots becoming northwest 10 to
20 knots after midnight. Haze through midnight. Waves calm to
2 feet.
.MONDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
late. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. A chance of rain showers. Waves calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots veering south. A
chance of rain showers. Waves calm to 2 feet.

$$

LSZ266-122215-
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-
1005 AM EDT Sun May 12 2024

.REST OF TODAY...South winds 20 to 30 knots diminishing to 10 to
20 knots. Scattered showers and isolated thunderstorms. Waves
3 to 6 feet occasionally to 8 feet building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming north 10 to
20 knots after midnight, then backing northwest late. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.MONDAY...Northwest winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight. Waves 1 to 3 feet.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots becoming southeast
10 to 20 knots. Waves calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots veering south. A
chance of rain showers. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.

$$

LSZ267-122215-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1005 AM EDT Sun May 12 2024

.REST OF TODAY...South winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. Scattered showers. Isolated thunderstorms by mid afternoon.
Waves 1 to 3 feet building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.TONIGHT...South winds 10 to 20 knots veering west after
midnight, then veering northwest late. Waves subsiding to calm to
2 feet.
.MONDAY...Northwest winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves 1 to 3 feet.
.TUESDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots. A chance of rain
showers. Waves calm to 2 feet.

$$
LSZ261-122215-
MAFOR 1215/
Superior West 11520 12620 11710 11720 11710 12810. Waves 1 to 3
feet.

Superior North Central 13520 11610 11810 11720 12820. Waves 2 to
5 feet.

Superior South Central 11430 19440 11430 11410 11500 11620 12710
11810. Waves 1 to 5 feet.

Superior East 12430 19446 11420 19426 11410 11510 13710. Waves 3
to 6 feet this afternoon and 1 to 4 feet tonight and Monday
morning.

$$

Rolfson

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

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