View the latest observations near Atlantic Tropical Storm Philippe and East Pacific Tropical Storm Lidia.
National Weather Service Marine Forecast FZUS63 KMQT
FZUS63 KMQT 040155
GLFLS
Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
955 PM EDT Tue Oct 3 2023
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
Tonight, a surface high pressure of 30.1 inches is
centered over the northern Appalachians with a 29.4 inch low over
southern Manitoba deepening to 29.2 inches while lifting to
Hudson Bay on Wednesday. An associated 29.7 inch trough will sweep
east, crossing Lake Superior Wednesday morning through Wednesday
evening. On Thursday, 29.6 inch low pressure will develop
southeast across far southern Manitoba into adjacent Ontario. As
this low tracks across far northern Lake Superior on Thursday
night, an associated trough will sweep across Lake Superior. Over
the weekend, a 30.3 inch ridge over the Central Plains will drift
east over the Plains states while weakening to 30.1 inches.
Meanwhile a low will strengthen to 29.4 inches over southeastern
Ontario.
LSZ162-041000
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM
955 PM EDT Tue Oct 3 2023 /855 PM CDT Tue Oct 3 2023/
REST OF TONIGHT
South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers and a slight chance
of thunderstorms. Waves 1 to 3 feet building to 2 to 4 feet.
WEDNESDAY
Southwest winds 20 to 30 knots veering west late. A
slight chance of thunderstorms through early afternoon. A chance
of showers. Waves building to 3 to 6 feet occasionally to 8 feet.
WEDNESDAY NIGHT
West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then backing southwest late. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
THURSDAY
Southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon with a few gale force gusts to 35 knots
possible late. Showers likely. Waves building to 4 to 7 feet
occasionally to 9 feet.
THURSDAY NIGHT
West winds 20 to 30 knots and a few gale force
gusts to 35 knots possible before diminishing to 15 to 25 knots
late. A chance of showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
FRIDAY
Northwest winds 15 to 25 knots. Showers likely. Waves
3 to 6 feet occasionally to 8 feet.
FRIDAY NIGHT
North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of showers. Waves subsiding to
2 to 4 feet.
SATURDAY
Northwest winds 10 to 20 knots becoming north 5 to
15 knots. Waves subsiding to calm to 2 feet.
SUNDAY
North winds 5 to 15 knots increasing to 10 to 20 knots.
Waves calm to 2 feet.
LSZ263-041000
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
955 PM EDT Tue Oct 3 2023
REST OF TONIGHT
South winds 15 to 25 knots increasing to 20 to
30 knots late. A chance of showers. Waves 1 to 3 feet building to
3 to 5 feet occasionally to 7 feet.
WEDNESDAY
South winds 20 to 30 knots veering west late. A
chance of showers. Waves building to 3 to 6 feet occasionally to
8 feet.
WEDNESDAY NIGHT
West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then backing southwest late. Waves
subsiding to 2 to 4 feet.
THURSDAY
Southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon with a few gale force gusts to 35 knots
possible late. A chance of showers through early afternoon, then
showers likely by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
THURSDAY NIGHT
West winds 20 to 30 knots with a few gale force
gusts to 35 knots possible. A chance of showers. Waves building
to 5 to 8 feet occasionally to 10 feet.
FRIDAY
Northwest winds 15 to 25 knots becoming north 20 to
30 knots by mid afternoon with a few gale force gusts to 35 knots
possible. Rain showers likely. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
FRIDAY NIGHT
North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of rain showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
SATURDAY
North winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of rain showers. Waves subsiding to calm to
2 feet.
SUNDAY
North winds 10 to 20 knots. Waves building to 2 to
4 feet.
LSZ264-041000
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border
955 PM EDT Tue Oct 3 2023
REST OF TONIGHT
South winds 15 to 25 knots increasing to 20 to
30 knots late. A slight chance of showers after midnight. Waves
2 to 4 feet building to 3 to 6 feet occasionally to 8 feet.
WEDNESDAY
South winds 20 to 30 knots veering southwest in the
afternoon, then diminishing to 15 to 25 knots late. A chance of
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
WEDNESDAY NIGHT
West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A slight chance of showers through
midnight. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.
THURSDAY
Southwest winds 15 to 25 knots. A chance of showers
through early afternoon, then showers likely by mid afternoon.
Waves building to 4 to 7 feet occasionally to 9 feet.
THURSDAY NIGHT
West winds 15 to 25 knots. A chance of showers.
Waves 4 to 7 feet occasionally to 9 feet.
FRIDAY
Northwest winds 20 to 30 knots veering north by mid
afternoon. Rain showers likely. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 5 to 8 feet occasionally
to 10 feet.
FRIDAY NIGHT
North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of rain showers. Waves building
to 5 to 9 feet occasionally to 11 feet.
SATURDAY
North winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to 1 to
3 feet.
SUNDAY
North winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
LSZ265-041000
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore
955 PM EDT Tue Oct 3 2023
REST OF TONIGHT
South winds 10 to 20 knots increasing to 15 to
25 knots late. A slight chance of showers after midnight. Waves
1 to 3 feet building to 2 to 4 feet, then subsiding to 1 to
3 feet.
WEDNESDAY
South winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then veering southwest late. A chance
of showers. A slight chance of thunderstorms by mid afternoon.
Waves subsiding to 1 to 3 feet.
WEDNESDAY NIGHT
West winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
A chance of showers and a slight chance of thunderstorms through
midnight. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
THURSDAY
Southwest winds 5 to 15 knots. A slight chance of
showers through early afternoon, then showers likely by mid
afternoon. Waves calm to 2 feet.
THURSDAY NIGHT
West winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet.
FRIDAY
West winds 10 to 20 knots becoming northwest 20 to
30 knots by mid afternoon. Showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
FRIDAY NIGHT
North winds 20 to 30 knots. Showers. Waves
building to 6 to 10 feet occasionally to 13 feet.
SATURDAY
North winds 15 to 25 knots diminishing to 10 to
20 knots. Showers likely, then a chance of showers. Waves
subsiding to 2 to 4 feet.
SUNDAY
North winds 15 to 25 knots. A chance of showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
LSZ266-041000
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
955 PM EDT Tue Oct 3 2023
REST OF TONIGHT
South winds 15 to 25 knots increasing to 20 to
30 knots late. Waves 3 to 6 feet occasionally to 8 feet.
WEDNESDAY
South winds 20 to 30 knots diminishing to 15 to
25 knots late. A chance of showers through early afternoon. A
slight chance of thunderstorms. Showers likely by mid afternoon.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
WEDNESDAY NIGHT
West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of showers and thunderstorms.
Waves building to 3 to 6 feet occasionally to 8 feet.
THURSDAY
Southwest winds 10 to 20 knots backing south by mid
afternoon. A slight chance of showers through early afternoon,
then showers likely by mid afternoon. Waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet.
THURSDAY NIGHT
Southwest winds 15 to 25 knots veering west
after midnight. A chance of showers. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
FRIDAY
West winds 15 to 25 knots becoming northwest 20 to
30 knots by mid afternoon. Showers. Waves building to 5 to 8 feet
occasionally to 10 feet.
FRIDAY NIGHT
North winds 20 to 30 knots. Showers. Waves
building to 8 to 11 feet occasionally to 14 feet.
SATURDAY
North winds 15 to 25 knots. Rain showers likely, then
a chance of rain showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
SUNDAY
North winds 15 to 25 knots increasing to 20 to
30 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
LSZ267-041000
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border
955 PM EDT Tue Oct 3 2023
REST OF TONIGHT
South winds 10 to 20 knots. Waves 1 to 3 feet
building to 2 to 4 feet.
WEDNESDAY
South winds 15 to 25 knots. A chance of showers and
a slight chance of thunderstorms. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
WEDNESDAY NIGHT
South winds 15 to 25 knots becoming west 5 to
15 knots after midnight. Showers likely through midnight. A
chance of thunderstorms. A chance of showers after midnight.
Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.
THURSDAY
Southwest winds 5 to 15 knots backing south by mid
afternoon. A chance of showers through early afternoon, then
showers likely by mid afternoon. Waves subsiding to calm to
2 feet.
THURSDAY NIGHT
Southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. Showers likely through midnight,
then a chance of showers after midnight. Waves building to 3 to
5 feet occasionally to 7 feet.
FRIDAY
West winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. Showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
FRIDAY NIGHT
North winds 20 to 30 knots. Showers. Waves
building to 6 to 10 feet occasionally to 13 feet.
SATURDAY
North winds 15 to 25 knots. Rain showers likely.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
SUNDAY
North winds 15 to 25 knots increasing to 20 to
30 knots. A chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
LSZ261-041000
MAFOR 0403/ Superior West 13430 13540 12630. A chance of showers overnight and Wednesday morning. Waves 2 to 4 feet overnight. Waves 3 to 6 feet Wednesday and Wednesday evening.
Superior North Central 11430 14440 11540 12530. A chance of showers Wednesday. Waves 2 to 4 feet building to 3 to 6 feet Wednesday and Wednesday evening.
Superior South Central 15430 11520 11610. A chance of showers Wednesday and Wednesday evening. Waves 2 to 4 feet overnight and Wednesday subsiding to 1 to 3 feet Wednesday evening.
Superior East 13430 12440 12436 11536. A chance of thunderstorms Wednesday evening. Waves 2 to 4 feet building to 3 to 6 feet Wednesday and Wednesday evening.
GS
Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable
Graphical marine forecasts are available online at: weather.gov/greatlakes