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National Weather Service Marine Forecast FZUS63 KMQT
FZUS63 KMQT 271959
GLFLS
Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
359 PM EDT Thu Mar 27 2025
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
Height rises continue as 30.4 inch high pressure
moves farther into northern Manitoba. Expect the ridge to build to
30.2 inches by this evening. The lake then becomes sandwiched
between the now 30.4 inch high moving over northern Ontario and
two low pressure systems around 29.5 inches tracking off the
Plains Friday and Saturday. The second low lifts northeast over
the Great Lakes on Sunday and Sunday night with 30.2 inch high
pressure settling southeast over the region by late in the day
Monday.
LSZ162-280400
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM
359 PM EDT Thu Mar 27 2025 /259 PM CDT Thu Mar 27 2025/
GALE WARNING IN EFFECT FROM FRIDAY AFTERNOON THROUGH LATE SATURDAY NIGHT
LATE THIS AFTERNOON
East winds 10 to 20 knots. Waves calm to
2 feet.
TONIGHT
East winds 10 to 20 knots increasing to 15 to 25 knots
after midnight. A chance of snow showers. A chance of rain
showers after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
FRIDAY
East winds 20 to 30 knots increasing to gales to
35 knots late. A chance of rain, possibly mixed with snow through
early afternoon, then rain, possibly mixed with snow and sleet by
mid afternoon. Waves building to 8 to 11 feet occasionally to
14 feet.
FRIDAY NIGHT
Northeast gales to 40 knots. Sleet through
midnight. A chance of rain and snow. A slight chance of sleet
after midnight. Waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 9 to 12 feet occasionally to 15 feet.
SATURDAY
Northeast gales to 35 knots. A slight chance of snow
showers. Waves subsiding to 5 to 8 feet occasionally to 10 feet.
SATURDAY NIGHT
Northeast gales to 35 knots. A chance of snow
through midnight, then snow likely after midnight. Waves building
to 7 to 10 feet occasionally to 13 feet.
SUNDAY
Northeast winds 20 to 30 knots. A chance of snow. Waves
subsiding to 6 to 9 feet occasionally to 11 feet.
SUNDAY NIGHT
Northeast winds 15 to 25 knots backing north
after midnight. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
MONDAY
North winds 15 to 25 knots becoming east 10 to
20 knots. Waves subsiding to calm to 2 feet.
TUESDAY
Southeast winds 10 to 20 knots becoming east 15 to
25 knots. A chance of snow. Waves building to 3 to 5 feet
occasionally to 7 feet.
LSZ263-280400
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
359 PM EDT Thu Mar 27 2025
GALE WARNING IN EFFECT FROM FRIDAY AFTERNOON THROUGH LATE SATURDAY NIGHT
LATE THIS AFTERNOON
East winds 5 to 15 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
TONIGHT
East winds 10 to 20 knots increasing to 15 to 25 knots
late. A chance of snow showers. A slight chance of rain showers
after midnight. Waves building to 3 to 5 feet occasionally to
7 feet.
FRIDAY
East winds 15 to 25 knots increasing to gales to
35 knots. A chance of rain and snow through early afternoon, then
rain and snow, possibly mixed with sleet by mid afternoon. Waves
building to 8 to 11 feet occasionally to 14 feet.
FRIDAY NIGHT
East gales to 40 knots backing northeast after
midnight. Snow and sleet, possibly mixed with rain through
midnight, then a slight chance of rain, snow and sleet after
midnight. Waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 9 to 12 feet occasionally to 15 feet.
SATURDAY
Northeast gales to 35 knots diminishing to 15 to
25 knots by mid afternoon. A slight chance of snow showers. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
SATURDAY NIGHT
Northeast winds 20 to 30 knots. A chance of
snow through midnight, then snow likely after midnight. Waves
building to 7 to 10 feet occasionally to 13 feet.
SUNDAY
Northeast winds 20 to 30 knots. A chance of snow. Waves
subsiding to 6 to 9 feet occasionally to 11 feet.
SUNDAY NIGHT
North winds 20 to 30 knots. Waves subsiding to
5 to 8 feet occasionally to 10 feet.
MONDAY
North winds 20 to 30 knots becoming east 10 to
20 knots. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
TUESDAY
Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of snow. Waves subsiding to calm to 2 feet,
then building to 3 to 6 feet occasionally to 8 feet.
LSZ264-280400
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border
359 PM EDT Thu Mar 27 2025
GALE WARNING IN EFFECT FROM FRIDAY AFTERNOON THROUGH LATE SATURDAY NIGHT
LATE THIS AFTERNOON
North winds 5 to 15 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
TONIGHT
East winds 5 to 15 knots becoming southeast 10 to
20 knots late. A chance of snow showers. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.
FRIDAY
Southeast winds 15 to 25 knots becoming east 20 to
30 knots in the afternoon, then increasing to gales to 35 knots
late. A chance of snow through early afternoon, then snow,
possibly mixed with sleet by mid afternoon. Waves building to
7 to 10 feet occasionally to 13 feet.
FRIDAY NIGHT
East gales to 35 knots backing northeast late.
Snow through midnight. A slight chance of sleet. A slight chance
of snow after midnight. Waves building to 7 to 11 feet
occasionally to 14 feet.
SATURDAY
Northeast winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Freezing spray through early
afternoon. A slight chance of snow showers and sleet through
early afternoon. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
SATURDAY NIGHT
East winds 20 to 30 knots. A chance of snow.
Waves building to 5 to 8 feet occasionally to 10 feet.
SUNDAY
Northeast winds 20 to 30 knots. A chance of snow. Waves
building to 5 to 9 feet occasionally to 11 feet.
SUNDAY NIGHT
North winds 20 to 30 knots. Freezing spray after
midnight. Waves 5 to 8 feet occasionally to 10 feet.
MONDAY
North winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray. Waves subsiding to 1 to 3 feet.
TUESDAY
Southeast winds 10 to 20 knots increasing to 15 to
25 knots. Waves subsiding to calm to 2 feet, then building to
3 to 6 feet occasionally to 8 feet.
LSZ265-280400
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore
359 PM EDT Thu Mar 27 2025
LATE THIS AFTERNOON
North winds 10 to 20 knots. Waves 3 to
6 feet occasionally to 8 feet.
TONIGHT
East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight, then increasing to 15 to 25 knots late.
A chance of snow showers. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
FRIDAY
Southeast winds 15 to 25 knots becoming east 20 to
30 knots in the afternoon. A chance of snow, possibly mixed with
rain, freezing rain and sleet through early afternoon, then rain
and snow, possibly mixed with sleet by mid afternoon. Waves
building to 5 to 8 feet occasionally to 10 feet.
FRIDAY NIGHT
East winds to 30 knots with a few gale force
gusts to 35 knots possible. Sleet, possibly mixed with snow and
rain through midnight, then a chance of snow and sleet, possibly
mixed with rain after midnight. Waves building to 6 to 9 feet
occasionally to 11 feet.
SATURDAY
Northeast winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. A slight chance of freezing rain
through early afternoon. A slight chance of snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
SATURDAY NIGHT
East winds 20 to 30 knots. A chance of snow
through midnight, then snow likely after midnight. Waves
subsiding to 3 to 5 feet occasionally to 7 feet, then building to
4 to 7 feet occasionally to 9 feet.
SUNDAY
Northeast winds 20 to 30 knots. Snow likely through
early afternoon, then a chance of snow, possibly mixed with
freezing rain by mid afternoon. Waves 4 to 7 feet occasionally to
9 feet.
SUNDAY NIGHT
North winds 20 to 30 knots. A chance of freezing
rain through midnight. A chance of snow. Freezing spray after
midnight. Waves building to 5 to 8 feet occasionally to 10 feet.
MONDAY
North winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray. Waves subsiding to 2 to 4 feet.
TUESDAY
Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of snow. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
LSZ266-280400
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
359 PM EDT Thu Mar 27 2025
LATE THIS AFTERNOON
North winds 10 to 20 knots. Waves 6 to
9 feet occasionally to 11 feet subsiding to 4 to 7 feet
occasionally to 9 feet.
TONIGHT
North winds 5 to 15 knots veering east after midnight,
then becoming southeast 10 to 20 knots late. A chance of snow
showers. Waves subsiding to calm to 2 feet.
FRIDAY
Southeast winds 15 to 25 knots becoming east 20 to
30 knots in the afternoon. A chance of snow, possibly mixed with
freezing rain through early afternoon, then snow, possibly mixed
with rain and sleet by mid afternoon. Waves building to 6 to
9 feet occasionally to 11 feet.
FRIDAY NIGHT
East winds to 30 knots with a few gale force
gusts to 35 knots possible backing northeast late. Snow, sleet,
possibly mixed with rain and freezing rain through midnight, then
a chance of freezing rain, sleet and snow after midnight. Waves
building to 6 to 10 feet occasionally to 13 feet.
SATURDAY
Northeast gales to 35 knots diminishing to 15 to
25 knots by mid afternoon. A slight chance of freezing rain
through early afternoon. A slight chance of snow showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
SATURDAY NIGHT
East winds 20 to 30 knots. A chance of snow
through midnight, then snow likely after midnight. Waves building
to 4 to 7 feet occasionally to 9 feet.
SUNDAY
Northeast winds 20 to 30 knots. Snow likely through
early afternoon. A chance of freezing rain. A chance of snow by
mid afternoon. Waves 4 to 7 feet occasionally to 9 feet.
SUNDAY NIGHT
North winds 20 to 30 knots increasing to gales to
35 knots after midnight. A chance of snow, possibly mixed with
freezing rain. Freezing spray after midnight. Waves building to
6 to 9 feet occasionally to 11 feet.
MONDAY
North gales to 35 knots diminishing to 15 to 25 knots.
Freezing spray. Waves subsiding to 4 to 8 feet occasionally to
10 feet.
TUESDAY
Southeast winds 10 to 20 knots. Waves subsiding to
calm to 2 feet, then building to 3 to 5 feet occasionally to
7 feet.
LSZ267-280400
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border
359 PM EDT Thu Mar 27 2025
LATE THIS AFTERNOON
Northwest winds 15 to 25 knots. Waves 4 to
8 feet occasionally to 10 feet.
TONIGHT
North winds 10 to 20 knots veering east after
midnight, then veering southeast late. A chance of snow showers
after midnight. Waves subsiding to calm to 2 feet.
FRIDAY
Southeast winds 15 to 25 knots becoming east 20 to
30 knots in the afternoon. A chance of snow, possibly mixed with
freezing rain through early afternoon, then snow, possibly mixed
with freezing rain, rain likely and sleet by mid afternoon. Waves
building to 3 to 6 feet occasionally to 8 feet.
FRIDAY NIGHT
East winds 20 to 30 knots. Snow and sleet,
possibly mixed with freezing rain through midnight, then a chance
of snow and sleet, possibly mixed with freezing rain after
midnight. Waves 3 to 6 feet occasionally to 8 feet.
SATURDAY
Northeast winds 20 to 30 knots diminishing to 10 to
20 knots by mid afternoon. A slight chance of snow showers
through early afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.
SATURDAY NIGHT
East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. A chance of snow, possibly mixed with
rain through midnight, then snow likely after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
SUNDAY
East winds 15 to 25 knots backing northeast by mid
afternoon. Snow likely through early afternoon. A chance of
freezing rain, possibly mixed with rain. A chance of snow by mid
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet.
SUNDAY NIGHT
Northeast winds 20 to 30 knots backing north
after midnight. A chance of rain through midnight. A chance of
freezing rain and snow. Freezing spray after midnight. Waves
building to 5 to 8 feet occasionally to 10 feet.
MONDAY
North winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray. A chance of snow showers. Waves
subsiding to 4 to 8 feet occasionally to 10 feet.
TUESDAY
Southeast winds 10 to 20 knots. Waves subsiding to
calm to 2 feet, then building to 3 to 5 feet occasionally to
7 feet.
LSZ261-280400
MAFOR 2721/
Superior West...GALE WARNING IN EFFECT...11210 12220 12230 12240
11256. A chance of snow showers Friday morning. Waves 1 to 3 feet
building to 3 to 6 feet tonight. Waves 5 to 8 feet building to 7
to 10 feet Friday.
Superior North Central...GALE WARNING IN EFFECT...11810 11200 11210 11310 11320 11337 12247. A chance of snow showers overnight. Waves 3 to 5 feet subsiding to 1 to 2 feet tonight. Waves 2 to 4 feet building to 5 to 8 feet Friday.
Superior South Central 11810 11100 11210 11310 11320 11330 11230 11247. A chance of snow showers overnight. A chance of snow showers and light freezing rain Friday morning, then a chance of light freezing rain Friday afternoon. Waves 4 to 7 feet subsiding to 1 to 3 feet tonight. Waves 2 to 4 feet building to 4 to 7 feet Friday.
Superior East 11730 11820 11100 11210 11310 11327 11337 11247. A chance of snow showers overnight. Waves 5 to 8 feet subsiding to 1 to 3 feet tonight. Waves 2 to 4 feet building to 3 to 6 feet Friday.
WFO MQT
Experimental modernized open lake forecast is available online at weather.gov/mqt/glftable
Graphical marine forecasts are available online at: weather.gov/greatlakes
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