246
FZUS63 KMQT 181414
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1014 AM EDT Sat May 18 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 over southern Manitoba tracks
northeast over far northwestern Ontario while deepening to 29.4
inches tonight before weakening to 29.6 inches over Hudson Bay on
Sunday. An associated 29.6 inch trough sweeps across western Lake
Superior today before weakening to 29.9 inches while sailing
across far eastern Lake Superior late tonight. By Sunday morning,
a 30.0 inch high pressure ridge settles over Wisconsin and
gradually shifts east over Southern Ontario by Monday morning.
Ridging is displaced by a broad 29.8 inch trough tracking
northeast across the Upper Great Lakes from the Central Plains
Monday evening. On Tuesday, a 29.5 inch low pressure tracks
northeast to the Upper Mississippi Valley while deepening to 29.1
inches. This low tracks across western Lake Superior Wednesday or
Wednesday night before weakening to 29.4 inches over Ontario on
Thursday.

LSZ162-182215-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1014 AM EDT Sat May 18 2024 /914 AM CDT Sat May 18 2024/

.REST OF TODAY...East winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then veering west late. A chance of
showers and thunderstorms. Waves 1 to 3 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then backing southwest late. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots backing east after
midnight. A chance of showers. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 10 to 20 knots backing northeast by mid
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots. Waves calm to
2 feet.
.TUESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. A chance of thunderstorms. Showers
likely. Waves building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. A chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to calm to 2 feet.

$$

LSZ263-182215-
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-
1014 AM EDT Sat May 18 2024

.REST OF TODAY...Southeast winds 5 to 15 knots increasing to
10 to 20 knots in the afternoon, then veering southwest late. A
slight chance of showers by late morning. A chance of
thunderstorms. Showers likely by mid afternoon. Waves 1 to
3 feet.
.TONIGHT...West winds 10 to 20 knots becoming southwest 5 to
15 knots late. A chance of showers and thunderstorms through
midnight. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots becoming south
5 to 15 knots after midnight. A chance of rain showers. Waves
subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots becoming east 15 to
25 knots. A chance of showers. A chance of thunderstorms. Showers
likely. Waves building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. A chance of rain showers. Waves subsiding to 1 to
3 feet.

$$

LSZ264-182215-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1014 AM EDT Sat May 18 2024

.REST OF TODAY...Southeast winds 5 to 15 knots increasing to
10 to 20 knots in the afternoon. A chance of showers and
thunderstorms by mid afternoon. Waves 2 to 4 feet building to
3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight, then becoming southwest 5 to 15 knots late. Rain
showers likely and a chance of thunderstorms through midnight.
Waves subsiding to 2 to 4 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots backing south after
midnight. A slight chance of showers after midnight. Waves
subsiding to calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots. A chance of showers.
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 becoming east 15 to
25 knots. Showers likely and a chance of thunderstorms. Waves
building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. A chance of thunderstorms. A chance of rain showers.
Waves subsiding to 2 to 4 feet.

$$

LSZ265-182215-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1014 AM EDT Sat May 18 2024

.REST OF TODAY...Southeast winds 10 to 20 knots increasing to
15 to 25 knots in the afternoon. A chance of showers and
thunderstorms by mid afternoon. Waves 1 to 3 feet building to
2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight. Showers likely and a chance of thunderstorms through
midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. A chance of showers
after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots. Showers likely through
early afternoon, then a chance of showers and a slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots backing northwest after
midnight. A chance of rain showers. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots increasing to 15 to 25 knots.
A chance of showers, then showers likely and a chance of
thunderstorms. Waves building to 1 to 3 feet.
.WEDNESDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of rain showers. Waves subsiding to calm to
2 feet.

$$

LSZ266-182215-
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-
1014 AM EDT Sat May 18 2024

.REST OF TODAY...South winds 10 to 20 knots becoming southeast
15 to 25 knots in the afternoon, then veering south late. A
slight chance of showers and thunderstorms by mid afternoon.
Waves 2 to 4 feet building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...South winds 15 to 25 knots becoming west 10 to
20 knots after midnight. Rain showers likely and a chance of
thunderstorms through midnight. Waves subsiding to 2 to 4 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves 2 to 4 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. A slight chance of
showers after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots. Showers likely. A
slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. A chance of rain showers. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots becoming east 15 to
25 knots. A chance of rain showers, then rain showers likely and
a chance of thunderstorms. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of rain showers. Waves subsiding to 2 to
4 feet.

$$

LSZ267-182215-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1014 AM EDT Sat May 18 2024

.REST OF TODAY...Southeast winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots veering west late. Rain
showers likely and a chance of thunderstorms. Waves building to
2 to 4 feet, then subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots. A chance of showers
through early afternoon, then showers likely and a slight chance
of thunderstorms by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering southeast. A chance
of showers, then showers likely and a chance of thunderstorms.
Waves building to 2 to 4 feet.
.WEDNESDAY...South winds 15 to 25 knots veering west. A chance of
rain showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.

$$

LSZ261-182215-
MAFOR 1815/
Superior West 11310 19319 11420 11526 12620 11520 12510. Waves 2
to 3 feet.

Superior North Central 11320 11330 11430 11526 11520 11620 12520.
A chance of thunderstorms this evening. Waves 2 to 4 feet
building to 3 to 5 feet this afternoon before subsiding to 2 to 4
feet tonight. Waves 2 to 4 feet Sunday morning.

Superior South Central 11320 12330 11426 11516 13610. A chance of
thunderstorms this evening. Waves 1 to 3 feet building to 2 to 4
feet this afternoon before subsiding to 1 to 3 feet tonight.
Waves 1 to 2 feet Sunday morning.

Superior East 11310 12320 11420 11426 11510 12610. A chance of
thunderstorms tonight. Waves 2 to 4 feet this afternoon and
tonight. Waves 1 to 2 feet Sunday morning.

$$

EK

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

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