National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 230751
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
351 AM EDT Wed Jun 23 2021

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
29.9 inch ridging will remain over Lake Superior
through this evening. A 29.2 inch low will then track across
Manitoba and reach James Bay tonight. This low will pull a 29.7
inch trough into the lake tonight and linger into Thursday.
Friday, a 29.7 inch low will organize over the Central Plains and
then lift toward the Upper Great Lakes. This low will track
through the region Friday night into Saturday.

LSZ162-231600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
351 AM EDT Wed Jun 23 2021 /251 AM CDT Wed Jun 23 2021/

EARLY THIS MORNING
Southwest winds 5 to 15 knots. Waves calm
to 2 feet.

TODAY
Southwest winds 5 to 15 knots backing south in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.

TONIGHT
South winds 10 to 20 knots veering southwest after
midnight, then diminishing to 5 to 15 knots late. A chance of
showers and thunderstorms. Patchy fog after midnight. Waves
building to 2 to 4 feet, then subsiding to calm to 2 feet.

THURSDAY
Northwest winds 5 to 15 knots backing south in the
afternoon. A slight chance of showers and thunderstorms through
early afternoon. Waves calm to 2 feet.

THURSDAY NIGHT
Northeast winds 5 to 15 knots. Waves calm to
2 feet.

FRIDAY
Northeast winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.

FRIDAY NIGHT
North winds 5 to 15 knots backing northwest after
midnight. Waves calm to 2 feet.

SATURDAY
East winds 5 to 15 knots backing northeast. Waves
calm to 2 feet.

SUNDAY
Northeast winds 5 to 15 knots backing north. A chance
of showers. Waves calm to 2 feet.

LSZ263-231600-
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-
351 AM EDT Wed Jun 23 2021

EARLY THIS MORNING
Southwest winds 10 to 20 knots. Waves calm
to 2 feet.

TODAY
Southwest winds 10 to 20 knots backing south in the
afternoon. Waves calm to 2 feet.

TONIGHT
South winds 15 to 25 knots becoming southwest 10 to
20 knots after midnight. A chance of showers through midnight. A
chance of thunderstorms. Showers likely after midnight. Patchy
fog after midnight. Waves building to 2 to 4 feet, then subsiding
to 1 to 3 feet.

THURSDAY
Southwest winds 5 to 15 knots veering north in the
afternoon, then veering south late. A slight chance of showers
and thunderstorms. Waves subsiding to calm to 2 feet.

THURSDAY NIGHT
North winds 5 to 15 knots veering northeast
after midnight. A slight chance of showers and thunderstorms
through midnight. Waves calm to 2 feet.

FRIDAY
Northeast winds 5 to 15 knots. Waves calm to 2 feet.

FRIDAY NIGHT
North winds 5 to 15 knots backing northwest after
midnight. Waves calm to 2 feet.

SATURDAY
North winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.

SUNDAY
South winds 5 to 15 knots backing north. A chance of
showers. Waves calm to 2 feet.

LSZ264-231600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
351 AM EDT Wed Jun 23 2021

EARLY THIS MORNING
South winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.

TODAY
Southwest winds 5 to 15 knots backing south in the
afternoon, then increasing to 15 to 25 knots late. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.

TONIGHT
South winds 15 to 25 knots becoming southwest 10 to
20 knots after midnight. A chance of showers through midnight. A
chance of thunderstorms. Showers likely after midnight. Patchy
fog after midnight. Waves building to 3 to 6 feet occasionally to
8 feet, then subsiding to 2 to 4 feet.

THURSDAY
Southwest winds 5 to 15 knots veering north in the
afternoon, then becoming south less than 10 knots late. A chance
of showers and thunderstorms. Waves subsiding to calm to 2 feet.

THURSDAY NIGHT
Northeast winds less than 10 knots. Waves calm
to 2 feet.

FRIDAY
Northeast winds less than 10 knots becoming north 5 to
15 knots by mid afternoon. Waves calm to 2 feet.

FRIDAY NIGHT
North winds less than 10 knots. Waves calm to
2 feet.

SATURDAY
Northwest winds less than 10 knots backing southwest.
Waves calm to 2 feet.

SUNDAY
Southwest winds less than 10 knots veering north. A
chance of showers. Waves calm to 2 feet.

LSZ265-231600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
351 AM EDT Wed Jun 23 2021

EARLY THIS MORNING
South winds 10 to 20 knots. Waves calm to
2 feet.

TODAY
South winds 10 to 20 knots. Waves building to 2 to
4 feet.

TONIGHT
South winds 15 to 25 knots becoming southwest 10 to
20 knots late. A chance of showers. A chance of thunderstorms
after midnight. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 1 to 3 feet.

THURSDAY
South winds 10 to 20 knots backing southeast in the
afternoon, then becoming east 5 to 15 knots late. A chance of
showers and thunderstorms. Waves subsiding to calm to 2 feet.

THURSDAY NIGHT
East winds 5 to 15 knots. A chance of showers
and thunderstorms. Waves calm to 2 feet.

FRIDAY
Northeast winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. Waves calm to 2 feet.

FRIDAY NIGHT
North winds 5 to 15 knots backing northwest after
midnight. Waves calm to 2 feet.

SATURDAY
North winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.

SUNDAY
Northeast winds 5 to 15 knots backing north. A chance
of showers. Waves calm to 2 feet.

LSZ266-231600-
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-
351 AM EDT Wed Jun 23 2021

EARLY THIS MORNING
South winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.

TODAY
South winds 10 to 20 knots increasing to 20 to 30 knots.
A slight chance of showers through early afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet.

TONIGHT
South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of showers. A chance of
thunderstorms after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.

THURSDAY
South winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. A chance of showers and thunderstorms.
Waves subsiding to calm to 2 feet.

THURSDAY NIGHT
South winds 5 to 15 knots backing northeast
after midnight. A chance of showers and thunderstorms. Waves calm
to 2 feet.

FRIDAY
Northeast winds 10 to 20 knots backing north by mid
afternoon. A chance of rain showers. Waves calm to 2 feet.

FRIDAY NIGHT
North winds 10 to 20 knots. Waves calm to 2 feet.

SATURDAY
North winds 5 to 15 knots backing northwest. Waves
calm to 2 feet.

SUNDAY
North winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

LSZ267-231600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
351 AM EDT Wed Jun 23 2021

EARLY THIS MORNING
South winds 10 to 20 knots. Isolated
showers. Waves calm to 2 feet.

TODAY
South winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. A slight chance of showers through early
afternoon. Waves building to 2 to 4 feet.

TONIGHT
South winds 20 to 30 knots diminishing to 15 to
25 knots late. A chance of showers and a slight chance of
thunderstorms after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

THURSDAY
South winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Showers likely through early
afternoon. A chance of thunderstorms. A chance of showers by mid
afternoon. Waves subsiding to calm to 2 feet.

THURSDAY NIGHT
South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Showers likely and a chance of
thunderstorms. Waves calm to 2 feet.

FRIDAY
East winds 5 to 15 knots becoming north 10 to 20 knots
by mid afternoon. A chance of showers. Waves calm to 2 feet.

FRIDAY NIGHT
North winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

SATURDAY
North winds 10 to 20 knots. Waves calm to 2 feet.

SUNDAY
North winds 10 to 20 knots veering northeast. A chance
of showers. Waves calm to 2 feet.

LSZ261-231600-
MAFOR 2309/
Superior West 11510 11500 11400 12410 11420 11520 11516. A chance
of thunderstorms overnight. Waves 2 feet or less today. Waves 1
to 3 feet tonight.

Superior North Central 11420 11520 11410 11420 13430 11526. A
chance of thunderstorms overnight. Waves 1 to 3 feet today
building to 3 to 5 feet tonight.

Superior South Central 14420 13430 11420. A chance of showers and
thunderstorms overnight. Waves 1 to 3 feet today. Waves 3 to 5
feet subsiding to 2 to 4 feet tonight.

Superior East 13420 12430 13440. A chance of showers overnight.
Waves 1 to 3 feet today. Waves 3 to 6 feet tonight.

JP

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

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