Great Lakes Forecast
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FZUS63 KMQT 062104
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
404 PM EST Wed Dec 6 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 high of 30.7 inches will slide south across the interface
between the Plains and Rockies Wednesday night and Thursday,
before a weak low of 29.7 inches slides through the Upper Great
Lakes out of Canada Thursday night. A separate low of 29.6 inches
will swing southeast through western Lake Superior towards
southern Lake Michigan Friday night and into Saturday. Brief
ridging on Sunday of 30.1 inches will give way to yet another low
of 29.6 inches expected to push through the Great Lakes on Monday.
Such a pattern will prevail through next week.

LSZ162-070515-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
404 PM EST Wed Dec 6 2017 /304 PM CST Wed Dec 6 2017/

...GALE WARNING IN EFFECT UNTIL 6 PM EST /5 PM CST/ THIS
EVENING...

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots with a few
gale force gusts to 35 knots. A chance of snow showers. Waves 4
to 7 feet occasionally to 9 feet.
.TONIGHT...Northwest winds 20 to 30 knots. A slight chance of
snow showers in the evening. Freezing spray. Waves building to
5 to 8 feet occasionally to 10 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.
.THURSDAY...Northwest winds 15 to 25 knots backing west. A chance
of snow showers. Waves subsiding to 2 to 4 feet, then building to
3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots veering northwest by
midnight. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.FRIDAY...Northwest winds 10 to 20 knots. A slight chance of snow
showers. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots becoming north
15 to 25 knots after midnight. Snow showers likely in the
evening. Waves building to 2 to 4 feet.
.SATURDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon. A chance of snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.SUNDAY...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 2 to 4 feet.
.MONDAY...North winds 15 to 25 knots backing northwest. A chance
of snow showers. Waves building to 3 to 5 feet occasionally to
7 feet.

$$

LSZ263-070515-
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-
404 PM EST Wed Dec 6 2017

...GALE WARNING IN EFFECT UNTIL 2 AM EST THURSDAY...

.LATE THIS AFTERNOON...Northwest gales to 35 knots. A chance of
snow showers. Waves 5 to 9 feet occasionally to 11 feet.
.TONIGHT...North gales to 35 knots becoming northwest 20 to
30 knots late. Freezing spray. A chance of snow showers. Waves
building to 6 to 9 feet occasionally to 11 feet, then subsiding
to 4 to 7 feet occasionally to 9 feet.
.THURSDAY...Northwest winds 15 to 25 knots backing west. A chance
of snow showers. Waves subsiding to 3 to 5 feet occasionally to
7 feet, then building to 4 to 7 feet occasionally to 9 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots late. Freezing spray in the evening. A chance of
snow showers. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.FRIDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Snow showers likely in the evening, then a chance
of snow showers after midnight. Waves building to 2 to 4 feet.
.SATURDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon. A chance of snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. A chance of snow showers. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.SUNDAY...Southwest winds 20 to 30 knots veering northwest. A
chance of snow showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...North winds 20 to 30 knots. A chance of snow showers.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.

$$

LSZ264-070515-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
404 PM EST Wed Dec 6 2017

...GALE WARNING IN EFFECT THROUGH 5AM THURSDAY...

.LATE THIS AFTERNOON...Northwest gales to 35 knots. A chance of
snow showers. Waves 7 to 10 feet occasionally to 13 feet.
.TONIGHT...North gales to 40 knots becoming northwest winds 20 to
30 knots late. Freezing spray. A chance of snow showers. Waves
building to 8 to 11 feet occasionally to 14 feet, then subsiding
to 6 to 9 feet occasionally to 11 feet.
.THURSDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then becoming west 15 to 25 knots by
mid afternoon. Freezing spray in the morning. A chance of snow
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots by midnight, then increasing to 15 to 25 knots
late. Freezing spray in the evening. A chance of snow showers.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Northwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight. A chance of snow showers. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.SATURDAY...North winds 15 to 25 knots. A chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.SUNDAY...West winds 20 to 30 knots veering north. A chance of
snow showers. Waves building to 4 to 8 feet occasionally to
10 feet.
.MONDAY...North winds 20 to 30 knots. Freezing spray. A chance of
snow showers. Waves subsiding to 3 to 6 feet occasionally to
8 feet.

$$

LSZ265-070515-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
404 PM EST Wed Dec 6 2017

...GALE WARNING IN EFFECT THROUGH 5AM THURSDAY...

.LATE THIS AFTERNOON...Northwest gales to 35 knots. Snow showers
likely. Waves 7 to 10 feet occasionally to 13 feet.
.TONIGHT...Northwest gales to 35 knots diminishing to 20 to
30 knots late. Snow showers likely in the evening, then a chance
of snow showers after midnight. Freezing spray after midnight.
Waves building to 7 to 11 feet occasionally to 14 feet.
.THURSDAY...Northwest winds 20 to 30 knots backing west by mid
afternoon. Freezing spray in the morning. A chance of snow
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...West winds 20 to 30 knots veering northwest by
midnight. Snow showers likely. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Snow showers likely. Waves subsiding
to 2 to 4 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Snow showers likely. Waves
subsiding to 1 to 3 feet.
.SATURDAY...North winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Freezing spray. Snow showers likely.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots backing west
after midnight. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.SUNDAY...Southwest winds 15 to 25 knots becoming northwest gales
to 35 knots. A chance of snow showers, then snow showers likely.
Waves building to 5 to 8 feet occasionally to 10 feet.
.MONDAY...North gales to 35 knots backing northwest. Freezing
spray. Snow showers likely. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ266-070515-
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-
404 PM EST Wed Dec 6 2017

...GALE WARNING IN EFFECT THROUGH 5AM THURSDAY...

.LATE THIS AFTERNOON...Northwest gales to 40 knots. Snow showers.
Waves 10 to 14 feet occasionally to 18 feet subsiding to 9 to
12 feet occasionally to 15 feet.
.TONIGHT...Northwest gales to 40 knots veering north by midnight.
Snow showers likely in the evening, then a chance of snow showers
after midnight. Freezing spray after midnight. Waves 9 to 12 feet
occasionally to 15 feet.
.THURSDAY...Northwest winds 20 to 30 knots backing west by mid
afternoon. Freezing spray. A chance of snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...West winds 20 to 30 knots veering northwest by
midnight. Snow showers likely. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...Northwest winds 20 to 30 knots. Snow showers likely.
Waves 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Snow showers likely. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.SATURDAY...North winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Freezing spray. Snow showers likely in
the morning. A chance of snow showers in the afternoon. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...North winds 15 to 25 knots backing northwest
after midnight. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.SUNDAY...Southwest winds 20 to 30 knots veering northwest. A
chance of snow showers, then snow showers likely. Waves building
to 4 to 8 feet occasionally to 10 feet.
.MONDAY...North gales to 35 knots. Freezing spray. Snow showers
likely. Waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to 4 to 7 feet occasionally to 9 feet.

$$

LSZ267-070515-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
404 PM EST Wed Dec 6 2017

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...

.LATE THIS AFTERNOON...Northwest gales to 40 knots. Snow showers.
Waves 10 to 14 feet occasionally to 18 feet subsiding to 9 to
12 feet occasionally to 15 feet.
.TONIGHT...Northwest gales to 35 knots veering north by midnight.
Snow showers likely in the evening, then a chance of snow showers
after midnight. Freezing spray after midnight. Waves subsiding to
8 to 11 feet occasionally to 14 feet.
.THURSDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots. Freezing spray in the morning. A chance of snow showers
in the morning, then snow showers likely in the afternoon. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...West winds 20 to 30 knots. Snow showers. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...Northwest winds 15 to 25 knots. Snow showers likely.
Waves 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Snow showers likely. Waves subsiding to 1 to
3 feet.
.SATURDAY...North winds 15 to 25 knots. A chance of snow showers.
Waves building to 2 to 4 feet.
.SATURDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.SUNDAY...Southwest winds 20 to 30 knots veering northwest. Snow
showers likely. Waves building to 4 to 8 feet occasionally to
10 feet.
.MONDAY...North gales to 35 knots diminishing to 20 to 30 knots.
A chance of snow showers, then snow showers likely. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.

$$

LSZ261-070515-
MAFOR 0622/
Superior West...Gale Warning in effect...11740 11850 11750 11740
12730 11630 11640. Freezing spray from late evening on. Chance of
snow showers this evening and Thursday afternoon. Waves 4 to 7
feet tonight, subsiding to 3 to 5 feet Thursday.

Superior North Central...Gale Warning in effect...11751 11750
12850 11740 12730 11630. Freezing spray this evening through mid
morning. Chance of snow showers this evening and Thursday
afternoon. Waves 6 to 11 feet tonight. Waves 5 to 8 feet
subsiding to 3 to 5 feet Thursday.

Superior South Central...Gale Warning in effect...14757 12740
11730 11630. Freezing spray late. Chance of snow showers late
tonight through Thursday. Waves 7 to 12 feet tonight through
Thursday morning, subsiding to 3 to 6 feet Thursday afternoon.

Superior East...Gale Warning in effect...11757 11747 11847 12840
11830 12730. Freezing spray late tonight through Thursday morning.
Chance of snow showers late tonight through Thursday. Waves 8 to
13 feet. Waves 6 to 10 feet subsiding to 4 to 7 feet Thursday.

$$

KCW

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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