Great Lakes Forecast
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247
FZUS63 KMQT 182047
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
347 PM EST Sat Nov 18 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...A 29.3 inch trough over Indiana will move northeast
this evening and strengthen to 29.1 inches across the Lower Great
Lakes overnight. A 30.3 inch high over the Southern Plains Sunday
will extend a 29.9 inch ridge over Lake Superior into Monday.
Then, a 29.3 inch trough will move toward the Upper Great Lakes on
Monday evening and pass James Bay by Tuesday evening. A 30.4 inch
high will slide southeast through the Northern Plains into the
Mid-Mississippi Valley Wednesday, and a 29.9 inch trough will
cross the Upper Great Lakes early Thursday.

LSZ162-190500-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
347 PM EST Sat Nov 18 2017 /247 PM CST Sat Nov 18 2017/

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Isolated
snow showers. Waves 2 to 4 feet.
.TONIGHT...Northwest winds 15 to 25 knots. Isolated snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots. Isolated snow showers in the
afternoon. Waves 2 to 4 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots by midnight, then backing southwest late. A slight
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 calm to 2 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 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. A chance of snow showers.
Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves building to 2 to
4 feet.
.THURSDAY...West winds 10 to 20 knots veering north. A chance of
snow showers. Waves subsiding to calm to 2 feet.

$$

LSZ263-190500-
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-
347 PM EST Sat Nov 18 2017

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Isolated
snow showers. Waves 2 to 4 feet.
.TONIGHT...Northwest winds 15 to 25 knots. Scattered snow
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 15 to 25 knots backing west. Scattered
snow showers. Waves 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots veering northwest by
midnight, then diminishing to 5 to 15 knots late. A chance of
snow showers. 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...Southwest winds 20 to 30 knots becoming west
gales to 35 knots after midnight. Waves building to 6 to 9 feet
occasionally to 11 feet.
.TUESDAY...Northwest gales to 35 knots. A chance of snow showers.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 5 to 8 feet occasionally to 10 feet.
.TUESDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves subsiding to 1 to
3 feet, then building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. A chance of snow showers. Waves subsiding to calm to
2 feet.

$$

LSZ264-190500-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
347 PM EST Sat Nov 18 2017

.LATE THIS AFTERNOON...North winds 15 to 25 knots. Isolated snow
showers. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...North winds 20 to 30 knots backing northwest by
midnight, then diminishing to 15 to 25 knots late. Scattered snow
showers. Waves building to 4 to 8 feet occasionally to 10 feet.
.SUNDAY...Northwest winds 15 to 25 knots backing west by mid
afternoon. Scattered snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots late. A chance of snow showers. Waves subsiding to
1 to 3 feet.
.MONDAY...South winds 5 to 15 knots increasing to 15 to 25 knots
in the afternoon. Waves subsiding to calm to 2 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots becoming west
gales to 35 knots after midnight. A chance of rain showers. A
chance of snow showers after midnight. Waves building to 6 to
9 feet occasionally to 11 feet.
.TUESDAY...Northwest gales to 35 knots. A chance of snow showers.
Waves building to 7 to 11 feet occasionally to 14 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots diminishing to 15 to
25 knots after midnight. Snow showers likely in the evening, then
a chance of snow showers after midnight. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Northwest winds 15 to 25 knots. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to calm to
2 feet.

$$

LSZ265-190500-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
347 PM EST Sat Nov 18 2017

.LATE THIS AFTERNOON...North winds 20 to 30 knots. Scattered snow
showers and areas of drizzle. Waves 3 to 6 feet occasionally to
8 feet.
.TONIGHT...North winds 20 to 30 knots backing northwest by
midnight. Scattered snow showers. Waves building to 5 to 9 feet
occasionally to 11 feet.
.SUNDAY...Northwest winds 20 to 30 knots backing west by mid
afternoon. Scattered snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...West winds 20 to 30 knots becoming northwest
15 to 25 knots by midnight, then diminishing to 10 to 20 knots
late. Snow showers likely in the evening, then a chance of snow
showers 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 building to 2 to 4 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots becoming west
gales to 35 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...West gales to 40 knots veering northwest in the
afternoon. A chance of snow showers, possibly mixed with rain in
the morning, then snow showers likely in the afternoon. Waves
building to 7 to 10 feet occasionally to 13 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. Snow showers likely. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...West winds 15 to 25 knots. A chance of snow showers.
Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.THURSDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots. A chance of snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to calm to 2 feet.

$$

LSZ266-190500-
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-
347 PM EST Sat Nov 18 2017

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

$$

LSZ267-190500-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
347 PM EST Sat Nov 18 2017

.LATE THIS AFTERNOON...North winds 20 to 30 knots. Patchy
drizzle. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...North winds 20 to 30 knots. Scattered snow showers and
patchy drizzle in the evening, then snow showers after midnight.
Waves building to 5 to 8 feet occasionally to 10 feet.
.SUNDAY...North winds 20 to 30 knots backing northwest. Numerous
snow showers. Waves subsiding to 4 to 7 feet occasionally to
9 feet.
.SUNDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots by midnight. Snow showers likely in the evening,
then a chance of snow showers after midnight. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming south 15 to
25 knots in the afternoon. A slight chance of snow showers in the
morning. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.MONDAY NIGHT...South winds 20 to 30 knots becoming southwest
gales to 35 knots after midnight. A chance of rain showers after
midnight. Waves building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...West gales to 35 knots becoming northwest gales to
40 knots in the afternoon. Rain showers likely in the morning.
Snow showers likely. Waves building to 10 to 14 feet occasionally
to 18 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. Snow showers likely. Waves subsiding to
5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...West winds 15 to 25 knots. A chance of snow showers.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 20 to 30 knots becoming north 15 to
25 knots. A chance of snow showers. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 2 to 4 feet.

$$

LSZ261-190500-
MAFOR 1822/
Superior West 15730 12630. Waves 3 to 5 feet.

Superior North Central 12840 13740 13730. Scattered snow showers.
Waves 4 to 7 feet.

Superior South Central 11745 11840 15740. Scattered snow showers.
Waves 5 to 8 feet building to 6 to 9 feet tonight, then subsiding
to 3 to 6 feet Sunday.

Superior East 11830 12840 12847 13737. Scattered snow showers
tonight. Waves 3 to 6 feet building to 5 to 8 feet tonight.

$$

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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