000
FZUS63 KMQT 172008
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
408 PM EDT Wed Apr 17 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 29.6 inch low pressure is currently placed over
Upper Michigan this afternoon. This low will weaken to 29.8
inches as it lifts east across northern Lake Michigan tonight
before phasing with another 29.8 inch low pressure over northern
Ontario. This low moves into eastern James Bay Friday night into
Saturday, deepening to 29.3 inches. Meanwhile, a 30.4 inch high
pressure ridge builds southeast into the Northern Plains extending
weak 30.0 inch ridging across western Lake Superior. Ridging over
the lake builds to 30.1 inches on Saturday and weakens to 30.0
inches Sunday. Troughing near 29.8 inches begins to develop over
the Northern Plains and pushes into western Lake Superior on
Monday.

LSZ162-180415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
408 PM EDT Wed Apr 17 2024 /308 PM CDT Wed Apr 17 2024/

...GALE WARNING IN EFFECT UNTIL 5 PM EDT /4 PM CDT/ THIS
AFTERNOON...

.LATE THIS AFTERNOON...North winds 15 to 25 knots with a few gale
force gusts to 35 knots possible. Numerous rain showers. Waves 5
to 8 feet occasionally to 10 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots. A chance of rain showers
through midnight. Waves subsiding to 1 to 3 feet.
.THURSDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...West winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. A slight chance of snow showers
through early afternoon. A chance of rain showers. Waves building
to 4 to 8 feet occasionally to 10 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.SATURDAY...Northwest winds 15 to 25 knots backing west by mid
afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.SUNDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots backing east. A chance
of rain showers. Waves building to 1 to 3 feet.

$$

LSZ263-180415-
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-
408 PM EDT Wed Apr 17 2024

...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

.LATE THIS AFTERNOON...Northeast winds 20 to 30 knots with a few
gale force gusts to 35 knots possible. Numerous rain showers.
Waves 8 to 11 feet occasionally to 14 feet subsiding to 7 to 10
feet occasionally to 13 feet.
.TONIGHT...North winds 10 to 20 knots backing west after
midnight. A chance of rain showers. Waves subsiding to 2 to
4 feet.
.THURSDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon, then veering west late. Waves
subsiding to 1 to 3 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots late. Waves building to 3 to 6 feet occasionally to
8 feet.
.FRIDAY...West gales to 35 knots. A chance of rain showers,
possibly mixed with snow. Waves building to 7 to 11 feet
occasionally to 14 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.SATURDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots backing east. A chance of
rain showers. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ264-180415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
408 PM EDT Wed Apr 17 2024

...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...East winds 20 to 30 knots with a few gale
force gusts to 35 knots possible. Rain showers. Waves 8 to 11
feet occasionally to 14 feet subsiding to 7 to 10 feet
occasionally to 13 feet.
.TONIGHT...East winds 15 to 25 knots becoming northwest 10 to
20 knots after midnight, then backing west late. A chance of rain
showers. Waves subsiding to 2 to 4 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest in the
afternoon, then increasing to 10 to 20 knots late. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots late. Waves building to 3 to 6 feet occasionally to
8 feet.
.FRIDAY...West gales to 35 knots. A slight chance of rain
showers. Waves building to 8 to 11 feet occasionally to 14 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots veering northwest after
midnight. Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. Waves building to
3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet.
.SUNDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots becoming east 10 to
20 knots. A chance of rain showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.

$$

LSZ265-180415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
408 PM EDT Wed Apr 17 2024

...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...East winds 15 to 25 knots with a few gale
force gusts to 35 knots possible. Rain showers. Waves 4 to 8 feet
occasionally to 10 feet.
.TONIGHT...East winds 5 to 15 knots becoming west 15 to 25 knots
after midnight, then increasing to 20 to 30 knots late. Rain
showers likely through midnight, then a slight chance of rain
showers after midnight. Waves subsiding to 2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots. A slight chance of rain
showers 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, then increasing to 15 to 25 knots
late. A slight chance of rain showers through midnight. Waves
building to 1 to 3 feet.
.FRIDAY...West winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. A slight chance of snow showers through early
afternoon. A chance of rain showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.SATURDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 10 to 20 knots backing southeast. A chance
of rain showers. Waves calm to 2 feet.

$$

LSZ266-180415-
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-
408 PM EDT Wed Apr 17 2024

...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...Southeast gales to 35 knots. Rain showers.
Waves 8 to 11 feet occasionally to 14 feet subsiding to 7 to
10 feet occasionally to 13 feet.
.TONIGHT...East winds 20 to 30 knots becoming west 15 to 25 knots
after midnight. A chance of rain showers. Waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing southwest late. A slight
chance of rain showers by mid afternoon. Waves subsiding to 1 to
3 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. A chance of rain showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...West winds 20 to 30 knots. A slight chance of snow
showers through early afternoon. A slight chance of rain showers.
Waves building to 7 to 10 feet occasionally to 13 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots. Waves subsiding to
6 to 9 feet occasionally to 11 feet.
.SATURDAY...Northwest gales to 35 knots becoming west 15 to
25 knots by mid afternoon. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.SATURDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.SUNDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.
.MONDAY...Southwest winds 10 to 20 knots backing southeast. A
chance of rain showers. Waves building to 1 to 3 feet.

$$

LSZ267-180415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
408 PM EDT Wed Apr 17 2024

...GALE WARNING IN EFFECT UNTIL 8 PM EDT THIS EVENING...

.LATE THIS AFTERNOON...Southeast gales to 35 knots. Rain showers.
Waves 5 to 9 feet occasionally to 11 feet.
.TONIGHT...Southeast gales to 35 knots diminishing to 10 to
20 knots after midnight, then veering west late. Rain showers
through midnight, then a chance of rain showers after midnight.
Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then becoming southwest 5 to 15 knots
late. Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 1 to 3 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight, then veering west late. A chance
of rain showers. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.FRIDAY...West winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. A chance of rain showers. Waves building to
5 to 8 feet occasionally to 10 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots increasing to gales to
35 knots after midnight. A chance of rain showers, possibly mixed
with snow. Waves building to 7 to 10 feet occasionally to
13 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots by mid afternoon. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots backing southeast. A
chance of rain showers. Waves calm to 2 feet.

$$

LSZ261-180415-
MAFOR 1721/
Superior West 11846 11720 12620 11610 11510 11520 11530. Waves 5
to 8 feet subsiding to 3 to 5 feet tonight and Thursday.


Superior North Central...GALE WARNING IN EFFECT...11246 11236
11120 11720 12620 11610 11520. Waves 7 to 11 feet subsiding to 3
to 5 feet tonight and Thursday.

Superior South Central...GALE WARNING IN EFFECT...11236 11210
11730 12640 11620 11610 11600. Waves 5 to 8 feet subsiding to 3
to 6 feet tonight, then subsiding to 1 to 3 feet Thursday.

Superior East...GALE WARNING IN EFFECT...12356 11236 11610 13620
11610. Waves 7 to 10 feet subsiding to 2 to 3 feet tonight, then building
to 3 to 5 feet Thursday.

$$

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