Great Lakes Forecast
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FZUS63 KMQT 102104
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
404 PM EST Sun Dec 10 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 30.2 inches will move over Lake Superior
overnight before a deepening low pressure of 29.8 inches swings
through the Great Lakes on Monday. As the aforementioned low deepens
to 29.4 inches in the Northeast on Tuesday, a high of 30.3 inches
will build into the western Great Lakes. A low of 29.5 inches will
then move through the Great Lakes Wednesday and Thursday only to be
replaced by a weak high of 29.9 inches on Friday.

LSZ162-110515-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
404 PM EST Sun Dec 10 2017 /304 PM CST Sun Dec 10 2017/

...GALE WARNING IN EFFECT FROM MONDAY AFTERNOON THROUGH LATE
MONDAY NIGHT...

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing southwest by
midnight, then backing south late. Isolated snow showers in the
evening, then numerous snow showers after midnight. Waves calm to
2 feet.
.MONDAY...Southwest winds 5 to 15 knots becoming north 10 to
20 knots by late morning, then increasing to gales to 35 knots by
mid afternoon. Scattered snow showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.MONDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots by midnight, then backing northwest late. Freezing spray
in the evening. A slight chance of snow showers. Waves building
to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to
5 feet occasionally to 7 feet.
.TUESDAY...Northwest winds 10 to 20 knots veering north in the
afternoon. A slight chance of snow showers. Waves subsiding to
calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.WEDNESDAY...South winds 10 to 20 knots veering southwest in the
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots veering northwest
after midnight. A chance of snow showers. Waves building to 1 to
3 feet.
.THURSDAY...Northwest winds 15 to 25 knots. A chance of snow
showers. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.FRIDAY...West winds 10 to 20 knots backing east. A chance of
snow showers. Waves subsiding to calm to 2 feet.

$$

LSZ263-110515-
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 Sun Dec 10 2017

...GALE WARNING IN EFFECT FROM MONDAY AFTERNOON THROUGH LATE
MONDAY NIGHT...

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Isolated snow
showers. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TONIGHT...North winds 5 to 15 knots backing west by midnight,
then backing south late. Scattered snow showers. Waves subsiding
to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming northwest 10 to
20 knots by late morning, then becoming north gales to 35 knots
by mid afternoon. Scattered snow showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.MONDAY NIGHT...North gales to 35 knots diminishing to 15 to
25 knots. 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.
.TUESDAY...North 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.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots. A chance of snow showers.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. A chance of snow showers. Waves
building to 1 to 3 feet.
.THURSDAY...North winds 15 to 25 knots backing northwest. A
chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.
.FRIDAY...West winds 10 to 20 knots veering northeast. A chance
of snow showers. Waves building to 2 to 4 feet, then subsiding to
calm to 2 feet.

$$

LSZ264-110515-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
404 PM EST Sun Dec 10 2017

...GALE WARNING IN EFFECT FROM MONDAY AFTERNOON THROUGH TUESDAY
MORNING...

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Isolated snow
showers. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...North winds 10 to 20 knots becoming west 5 to 15 knots
by midnight, then backing southwest late. Isolated snow showers.
Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots becoming west 15 to
25 knots by late morning, then becoming north gales to 40 knots
by mid afternoon. Scattered snow showers. Freezing spray in the
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...North gales to 40 knots diminishing to 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 5 to 8 feet occasionally to 10 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Freezing spray in the morning. A
chance of snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...South winds 5 to 15 knots. A chance of snow showers.
Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. A chance of snow
showers. Waves calm to 2 feet.
.THURSDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots. A chance of snow showers. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.FRIDAY...West winds 10 to 20 knots backing east. Snow showers
likely, then a chance of snow showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.

$$

LSZ265-110515-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
404 PM EST Sun Dec 10 2017

...GALE WARNING IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
MORNING...

.LATE THIS AFTERNOON...North winds 15 to 25 knots. Freezing
spray. Scattered snow showers. Waves 3 to 6 feet occasionally to
8 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by midnight, then becoming southwest 10 to 20 knots
late. Scattered snow showers. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots veering west by late
morning, then becoming northwest gales to 35 knots by mid
afternoon. Scattered snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...North gales to 40 knots. Freezing spray. Snow
showers. Waves building to 9 to 12 feet occasionally to 15 feet,
then subsiding to 7 to 10 feet occasionally to 13 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Freezing spray. Snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Freezing spray in the evening. Snow
showers likely. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots. A chance of snow
showers. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots. A chance of
snow showers. Waves calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots becoming northwest
15 to 25 knots. Snow showers likely. Waves building to 2 to
4 feet.
.FRIDAY...West winds 15 to 25 knots veering north. Snow showers
likely, then a chance of snow showers. Waves subsiding to calm to
2 feet.

$$

LSZ266-110515-
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 Sun Dec 10 2017

...GALE WARNING IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
MORNING...

.LATE THIS AFTERNOON...North winds 15 to 25 knots. Freezing
spray. Scattered snow showers. Waves 3 to 6 feet occasionally to
8 feet.
.TONIGHT...North winds 15 to 25 knots becoming northwest 5 to
15 knots by midnight, then backing west late. Scattered snow
showers. Waves subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming northwest gales
to 40 knots by mid afternoon. Scattered snow showers. Waves
building to 4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...North gales to 40 knots. Freezing spray. Snow
showers. Waves building to 10 to 14 feet occasionally to 18 feet,
then subsiding to 8 to 11 feet occasionally to 14 feet.
.TUESDAY...North winds 20 to 30 knots. Freezing spray. Snow
showers. Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Freezing spray in the evening. A chance
of snow showers. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...East winds 10 to 20 knots veering south in the
afternoon. A chance of snow showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots. A chance of snow
showers. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots becoming north 15 to
25 knots. A chance of snow showers, then snow showers likely.
Waves building to 2 to 4 feet.
.FRIDAY...West winds 15 to 25 knots. Snow showers likely, then a
chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.

$$

LSZ267-110515-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
404 PM EST Sun Dec 10 2017

...GALE WARNING IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
MORNING...

.LATE THIS AFTERNOON...North winds 15 to 25 knots. Scattered snow
showers. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots by midnight, then backing southwest late. Scattered snow
showers. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots backing south by late
morning, then becoming west 15 to 25 knots by mid afternoon.
Scattered snow showers in the morning, then numerous snow showers
in the afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...North gales to 40 knots. Freezing spray. Snow
showers. Waves building to 7 to 11 feet occasionally to 14 feet.
.TUESDAY...North gales to 35 knots diminishing 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
subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Freezing spray in the evening. A chance
of snow showers. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots veering southeast in
the afternoon. A chance of snow showers. Waves subsiding to calm
to 2 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots veering southeast
after midnight. A chance of snow showers. Waves calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots veering northwest. A
chance of snow showers, then snow showers likely. Waves building
to 1 to 3 feet.
.FRIDAY...West winds 15 to 25 knots. Snow showers likely. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
1 to 3 feet.

$$

LSZ261-110515-
MAFOR 1022/
Superior West...Gale Warning in effect...11810 11700 11600 11510
11417 11600 11720 11850. Scattered snow showers late tonight and
Monday morning. Waves 1 to 4 feet.

Superior North Central...Gale Warning in effect...11820 11810
11700 11610 12510 11617 11757. Scattered snow showers Monday
morning. Waves 1 to 5 feet.

Superior South Central 11830 11720 11710 11610 13510 11620.
Freezing spray early this evening. Scattered snow showers this
evening and from late Monday morning through Monday. Waves 3 to 6
feet subsiding to 1 to 3 feet tonight and Monday.

Superior East 12820 11800 11600 11510 12520 11627. Scattered snow
showers tonight and Monday morning. Waves 1 to 4 feet.

$$

JSS

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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