000
FZUS63 KMQT 122007
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
407 PM EDT Fri Apr 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...28.8 inch low currently centered over southern
Quebec, northeast of Georgian Bay this evening, will continue to
slowly lift northward tonight. Meanwhile, ridging at 30.0 inches
builds across western Lake Superior then shifts east across the
entire lake on Saturday. Ridging shifts east Saturday night as a
broad 29.7 inch low pressure spins across the Upper Midwest. This
low pressure clips the Great Lakes Sunday, centering over Lake
Michigan early Sunday morning before phasing with deeper low
pressure east of James Bay. A 30.0 inch ridge extending from
northwest Ontario follows in its wake Sunday afternoon into
Monday, building to 30.2 inches Tuesday morning. Tuesday, deep low
pressure of 29.2 inches will lift northeast through the central
Plains. The low spins across the Upper Great Lakes through
Wednesday.

LSZ162-130415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
407 PM EDT Fri Apr 12 2024 /307 PM CDT Fri Apr 12 2024/

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 1 to
3 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then backing west late. Waves subsiding
to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots backing south in the
afternoon, then becoming east 10 to 20 knots late. A slight
chance of rain showers by mid afternoon. Waves building to 1 to
3 feet.
.SATURDAY NIGHT...Northeast winds 10 to 20 knots. A chance of
rain showers. Waves building to 2 to 4 feet, then subsiding to
calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest by mid
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Northwest winds 10 to 20 knots becoming east 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet.
.MONDAY NIGHT...East winds 15 to 25 knots. A chance of rain
showers. Waves 2 to 4 feet.
.TUESDAY...East gales to 35 knots. Rain showers. Waves building
to 5 to 9 feet occasionally to 11 feet.
.WEDNESDAY...Northeast winds 20 to 30 knots backing west. Rain
showers, then a chance of rain showers. Waves subsiding to 2 to
4 feet.

$$

LSZ263-130415-
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-
407 PM EDT Fri Apr 12 2024

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 2 to
4 feet.
.TONIGHT...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest in the
afternoon, then backing east late. A chance of rain showers by
mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots backing northeast
late. A chance of rain showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots backing southwest by mid
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.MONDAY...West winds 5 to 15 knots backing east by mid afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots increasing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.TUESDAY...East gales to 35 knots. A chance of rain showers, then
rain showers. Waves building to 8 to 11 feet occasionally to
14 feet.
.WEDNESDAY...East gales to 35 knots becoming west 15 to 25 knots.
Rain showers, then a chance of rain showers. Waves subsiding to
3 to 5 feet occasionally to 7 feet.

$$

LSZ264-130415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
407 PM EDT Fri Apr 12 2024

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots with a few
gale force gusts to 35 knots. Waves 4 to 8 feet occasionally to
10 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon, then backing southwest late. A chance
of rain showers by mid afternoon. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots backing northeast
late. A chance of rain showers. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots backing west by mid
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.MONDAY...West winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming east 10 to
20 knots after midnight. Waves building to 1 to 3 feet.
.TUESDAY...East gales to 35 knots. A chance of rain showers, then
rain showers. Waves building to 7 to 11 feet occasionally to
14 feet.
.WEDNESDAY...East gales to 35 knots becoming west 15 to 25 knots.
Rain showers, then a chance of rain showers. Waves subsiding to
3 to 5 feet occasionally to 7 feet.

$$

LSZ265-130415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
407 PM EDT Fri Apr 12 2024

...GALE WARNING IN EFFECT UNTIL 7 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...Northwest gales to 35 knots. Waves 5 to
9 feet occasionally to 11 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.SATURDAY...Northwest winds 15 to 25 knots becoming west 5 to
15 knots in the afternoon, then backing east late. A chance of
rain showers by mid afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots diminishing to 5 to
15 knots late. Rain showers likely through midnight, then a
chance of rain showers after midnight. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots becoming northwest 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 20 to 30 knots increasing to gales to
35 knots. A chance of rain showers, then rain showers. Waves
building to 5 to 9 feet occasionally to 11 feet.
.WEDNESDAY...Southeast winds 20 to 30 knots veering west. Rain
showers, then a chance of rain showers. Waves subsiding to 1 to
3 feet.

$$

LSZ266-130415-
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-
407 PM EDT Fri Apr 12 2024

...GALE WARNING IN EFFECT UNTIL 2 AM EDT SATURDAY...

.LATE THIS AFTERNOON...Northwest gales to 40 knots. Waves 10 to
14 feet occasionally to 18 feet.
.TONIGHT...Northwest gales to 40 knots diminishing to 20 to
30 knots late. Waves subsiding to 6 to 9 feet occasionally to
11 feet.
.SATURDAY...Northwest winds 15 to 25 knots becoming west 5 to
15 knots late. A slight chance of rain showers by mid afternoon.
Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
A chance of rain showers. Waves subsiding to calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East gales to 40 knots. A chance of rain showers, then
rain showers. Waves building to 7 to 10 feet occasionally to
13 feet.
.WEDNESDAY...Southeast gales to 35 knots becoming west 20 to
30 knots. Rain showers, then a chance of rain showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.

$$

LSZ267-130415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
407 PM EDT Fri Apr 12 2024

...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING...

.LATE THIS AFTERNOON...Northwest gales to 45 knots. Waves 10 to
14 feet occasionally to 18 feet subsiding to 10 to 14 feet
occasionally to 18 feet.
.TONIGHT...Northwest gales to 45 knots. Waves subsiding to 7 to
10 feet occasionally to 13 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots in the afternoon, then becoming west 10 to 20 knots
late. A slight chance of rain and snow showers by mid afternoon.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight, then backing east late. Rain
showers likely, possibly mixed with snow showers through
midnight, then a chance of rain showers after midnight. Waves
subsiding to calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 20 to 30 knots becoming southeast gales to
35 knots. A chance of rain showers, then rain showers. Waves
building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Southeast gales to 35 knots becoming west 20 to
30 knots. Rain showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 2 to 4 feet.

$$

LSZ261-130415-
MAFOR 1221/
Superior West 13720 11710 11610 11600 11500 11300. Waves 1 to 3
feet tonight subsiding to 1 foot or less Saturday.

Superior North Central 14740 11740 11720 11620 11610. Waves 3 to
7 feet tonight subsiding to 1 to 3 feet Saturday.

Superior South Central...GALE WARNING IN EFFECT...12750 13740
12730 11810. Waves 7 to 11 feet subsiding to 5 to 9 feet tonight.
Waves 5 to 8 feet subsiding to 2 to 4 feet Saturday.

Superior East...GALE WARNING IN EFFECT...14750 12740 12730. Waves
9 to 13 feet subsiding to 7 to 11 feet tonight. Waves 6 to 10
feet subsiding to 5 to 8 feet Saturday.

$$

JSS

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

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