000
FZUS63 KMQT 130819
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
419 AM EDT Sat Apr 13 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 29.1 inch low currently centered over Quebec
southeast of James Bay, will continue to slowly lift northward
through Quebec today on the east side of Hudson Bay. Meanwhile,
ridging at 30.0 inches builds across western Lake Superior this
morning then shifts east across the entire lake this afternoon.
Ridging shifts east tonight as a broad 29.6 inch low pressure
moves across the Upper Midwest. This low pressure will continue to
move east across the Central and Lower Great Lakes on Sunday. 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 will weaken to 29.3
inches as it reaches the Upper Great Lakes on Wednesday.

LSZ162-131630-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
419 AM EDT Sat Apr 13 2024 /319 AM CDT Sat Apr 13 2024/

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Southwest winds 5 to 15 knots backing east in the
afternoon, then becoming northeast 10 to 20 knots late. A chance
of rain showers. Waves building to 2 to 4 feet.
.TONIGHT...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A slight chance of rain showers. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.SUNDAY...West winds 5 to 15 knots backing south late. Waves calm
to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots becoming northwest 10 to
20 knots after midnight. Waves calm to 2 feet.
.MONDAY...Northwest winds 10 to 20 knots backing south by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots increasing to 20 to
30 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...Northeast gales to 35 knots. A chance of rain showers,
then rain showers. Waves building to 4 to 8 feet occasionally to
10 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots backing west. Rain
showers, then a chance of rain showers. Waves subsiding to 2 to
4 feet.

$$

LSZ263-131630-
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-
419 AM EDT Sat Apr 13 2024

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon, then backing east late. A chance of rain showers.
Waves building to 1 to 3 feet.
.TONIGHT...East winds 10 to 20 knots becoming northeast 5 to
15 knots after midnight. A slight chance of rain showers. Waves
building to 2 to 4 feet, then subsiding to calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots backing west in the
afternoon, then backing southwest late. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves building to 1 to
3 feet.
.MONDAY...West winds 5 to 15 knots backing south by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 1 to 3 feet.
.TUESDAY...East winds 20 to 30 knots. A chance of rain showers,
then rain showers. Waves building to 6 to 9 feet occasionally to
11 feet.
.WEDNESDAY...East winds 20 to 30 knots becoming west 15 to
25 knots. Rain showers, then a chance of rain showers. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ264-131630-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
419 AM EDT Sat Apr 13 2024

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TODAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon, then backing southwest late. A slight
chance of rain showers by mid afternoon. Waves subsiding to calm
to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east after
midnight. A slight chance of rain showers. Waves building to 1 to
3 feet.
.SUNDAY...Northeast winds 5 to 15 knots backing north in the
afternoon, then backing west late. Waves subsiding to calm to
2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves building to 1 to
3 feet.
.MONDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 1 to 3 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 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...East winds 20 to 30 knots becoming northwest 15 to
25 knots. Rain showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ265-131630-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
419 AM EDT Sat Apr 13 2024

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TODAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then backing east late. A slight chance of rain
showers by mid afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots backing east after
midnight, then diminishing to 5 to 15 knots late. A chance of
rain showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots veering north by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 15 to 25 knots increasing to 20 to
30 knots. A chance of rain showers, then rain showers. Waves
building to 4 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Southeast winds 20 to 30 knots veering west. Rain
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.

$$

LSZ266-131630-
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-
419 AM EDT Sat Apr 13 2024

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

$$

LSZ267-131630-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
419 AM EDT Sat Apr 13 2024

.EARLY THIS MORNING...Northwest winds to 30 knots with a few gale
force gusts to 35 knots possible near Whitefish Bay. Waves 5 to 9
feet occasionally to 11 feet.
.TODAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. A chance of rain showers by mid afternoon. Waves subsiding
to 2 to 4 feet.
.TONIGHT...South winds 5 to 15 knots backing southeast after
midnight, then increasing to 10 to 20 knots late. A chance of
rain showers. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SUNDAY...Northeast winds 5 to 15 knots becoming north 10 to
20 knots in the afternoon, then backing northwest late. Waves
subsiding to calm to 2 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots. Waves 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 10 to 20 knots becoming southeast gales to
35 knots. Rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...Southeast gales to 35 knots veering west. Rain
showers, then a chance of rain showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet.

$$

LSZ261-131630-
MAFOR 1309/
Superior West 11600 11500 11400 11210 11220 12120 11110. Waves 2
feet or less today. Waves 1 to 3 feet building to 2 to 4 feet
tonight.

Superior North Central 11730 11720 12610 11510 12310 11210. Waves
3 to 5 feet subsiding to 1 to 3 feet today. Waves 1 to 3 feet
tonight.

Superior South Central 11730 11720 11620 11600 11300 11310 11320
11310. A chance of rain showers tonight. Waves 4 to 7 feet
subsiding to 1 to 3 feet today. Waves 2 feet or less building to
2 to 3 feet tonight.

Superior East 11740 12730 11630 11610 11500 12310. A chance of
rain showers tonight. Waves 5 to 8 feet subsiding to 3 to 5 feet
today. Waves 2 to 4 feet tonight.

$$

Voss

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

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