Great Lakes Forecast
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FZUS63 KMQT 172050
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
350 PM EST Fri Nov 17 2017

For waters beyond five 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 29.4 inch trough will move out of the
mountains of Colorado and will push across the Central Plains
tomorrow. The trough will strengthen to 29.0 inches across the
Lower Great Lakes Saturday night. A 30.3 inch high over the
Southern Plains Sunday will then build into the western Great
Lakes Sunday night. Then, a 29.3 inch trough will move toward the
Upper Great Lakes on Monday evening, reaching Southern Quebec by
late Tuesday night. A 30.5 inch high will then slide southeast
through the Northern Plains into the Mid- Mississippi Valley
Wednesday.

LSZ162-180500-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
350 PM EST Fri Nov 17 2017 /250 PM CST Fri Nov 17 2017/

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. A chance
of rain, possibly mixed with snow. Waves 3 to 5 feet occasionally
to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...West winds 10 to 20 knots veering north by midnight,
then increasing to 15 to 25 knots late. A slight chance of
drizzle in the evening. Waves subsiding to 1 to 3 feet.
.SATURDAY...North winds 15 to 25 knots backing northwest. A
chance of snow in the afternoon. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots. A chance of
snow showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots becoming southwest 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
gales to 35 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots. A chance of snow showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing west. Waves
subsiding to calm to 2 feet.

$$

LSZ263-180500-
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-
350 PM EST Fri Nov 17 2017

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Rain
likely. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 5 to 15 knots becoming north 10 to 20 knots
by midnight. A slight chance of drizzle in the evening. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.SATURDAY...North winds 15 to 25 knots backing northwest by mid
afternoon. A chance of snow in the afternoon. Waves building to
3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots. Snow showers
likely. Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west in the
afternoon. A chance of snow showers. Waves subsiding to 2 to
4 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...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
gales to 35 knots after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots. A chance of snow showers. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. A chance of snow showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.

$$

LSZ264-180500-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
350 PM EST Fri Nov 17 2017

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Rain,
possibly mixed with snow. Waves 5 to 9 feet occasionally to
11 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming north 10 to
20 knots by midnight, then increasing to 15 to 25 knots late. A
chance of drizzle in the evening. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...North winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of snow in the afternoon.
Waves building to 5 to 8 feet occasionally to 10 feet.
.SATURDAY NIGHT...North winds 20 to 30 knots with a few gale force
gusts to 35 knots backing northwest by midnight. Snow showers
likely. Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.SUNDAY...Northwest winds 15 to 25 knots backing west in the
afternoon. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. A chance of snow showers in the
evening. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...South winds 15 to 25 knots becoming west 20 to
30 knots after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...Northwest gales to 35 knots. A chance of snow showers.
Waves building to 8 to 11 feet occasionally to 14 feet, then
subsiding to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet.

$$

LSZ265-180500-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
350 PM EST Fri Nov 17 2017

.LATE THIS AFTERNOON...South winds 15 to 25 knots. Rain. Waves
4 to 7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering northwest by
midnight, then becoming north 15 to 25 knots late. Drizzle in the
evening, then a slight chance of drizzle after midnight. Waves
subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...North winds 20 to 30 knots backing northwest by mid
afternoon. A slight chance of drizzle. A chance of snow in the
afternoon. Waves building to 6 to 9 feet occasionally to 11 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots with a few gale
force gusts to 35 knots. Snow showers likely. Waves subsiding to
4 to 7 feet occasionally to 9 feet.
.SUNDAY...Northwest winds 20 to 30 knots backing west in the
afternoon. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.SUNDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of snow showers in the evening.
Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots backing south in the
afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
gales to 35 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...West gales to 35 knots veering northwest. A chance of
rain showers. Snow showers likely. Waves building to 7 to 10 feet
occasionally to 13 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots backing west. A
chance of snow showers. Waves subsiding to 1 to 3 feet.

$$

LSZ266-180500-
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-
350 PM EST Fri Nov 17 2017

.LATE THIS AFTERNOON...South winds 20 to 30 knots. Rain. Waves
8 to 11 feet occasionally to 14 feet subsiding to 7 to 10 feet
occasionally to 13 feet.
.TONIGHT...Southwest winds 15 to 25 knots becoming northwest.
Rain and drizzle likely in the evening, then a slight chance of
drizzle after midnight. Waves subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...North winds 20 to 30 knots with a few gale force gusts
to 35 knots. A slight chance of drizzle. A chance of snow in the
afternoon. Waves building to 7 to 10 feet occasionally to 13 feet.
.SATURDAY NIGHT...North winds 20 to 30 knots with a few gale force
gusts to 35 knots becoming northwest late. Snow showers. Waves
subsiding to 6 to 9 feet occasionally to 11 feet.
.SUNDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Snow showers likely in the morning,
then a chance of snow showers in the afternoon. Waves subsiding
to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...West winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming south 15 to
25 knots in the afternoon. Waves subsiding to calm to 2 feet,
then building to 2 to 4 feet.
.MONDAY NIGHT...South winds 20 to 30 knots veering southwest
after midnight. Waves building to 5 to 8 feet occasionally to
10 feet.
.TUESDAY...Northwest gales to 40 knots. Snow showers likely.
Waves building to 10 to 14 feet occasionally to 18 feet, then
subsiding to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. A chance of snow showers. Waves subsiding to 2 to
4 feet.

$$

LSZ267-180500-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
350 PM EST Fri Nov 17 2017

.LATE THIS AFTERNOON...South winds 20 to 30 knots. Rain, possibly
mixed with snow. Waves 5 to 9 feet occasionally to 11 feet.
.TONIGHT...South winds 20 to 30 knots becoming west 15 to
25 knots by midnight, then becoming north 10 to 20 knots late.
Rain in the evening, then a chance of drizzle after midnight.
Waves subsiding to 1 to 3 feet.
.SATURDAY...North winds 15 to 25 knots with a few gale force gusts
to 35 knots. A chance of drizzle. Waves building to 7 to 10 feet
occasionally to 13 feet.
.SATURDAY NIGHT...North winds 20 to 30 knots with a few gale force
gusts to 35 knots. A chance of drizzle in the evening. A chance
of snow showers. Waves subsiding to 5 to 8 feet occasionally to 10
feet.
.SUNDAY...North winds 20 to 30 knots backing northwest in the
afternoon. Snow showers likely. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...West winds 20 to 30 knots becoming northwest
10 to 20 knots after midnight. Snow showers likely in the
evening, then a chance of snow showers after midnight. Waves
subsiding to 2 to 4 feet.
.MONDAY...West winds 10 to 20 knots backing south in the
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.MONDAY NIGHT...South winds 20 to 30 knots becoming southwest
gales to 35 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...West gales to 40 knots becoming northwest gales to
35 knots. A chance of rain showers. Snow showers likely. Waves
building to 10 to 14 feet occasionally to 18 feet, then subsiding
to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots. A chance of snow showers. Waves subsiding to 2 to
4 feet.

$$

LSZ261-180500-
MAFOR 1722/
Superior West 11520 11610 11720 12820 11830 11720 11730. Chance
of rain this evening. Waves 2 to 4 feet.

Superior North Central 11526 11510 11730 11830 14840. Chance of
drizzle late this evening tonight. Waves 5 to 8 feet subsiding to
3 to 6 feet tonight through Saturday.

Superior South Central 11436 11516 11720 11730 11830 12840 11740.
Chance of drizzle after midnight tonight. Waves 4 to 7 feet
subsiding to 2 to 4 feet tonight. Waves building to 6 to 9 feet
Saturday.

Superior East 11446 11446 11620 11720 11820 12840 11840. Chance
of rain and drizzle after midnight tonight. Waves 6 to 10 feet
subsiding to 2 to 4 feet tonight. Waves building to 5 to 8 feet
Saturday.

$$

Borchardt

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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