Great Lakes Forecast
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000
FZUS63 KMQT 201442
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
942 AM EST Sat Jan 20 2018



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 29.1 inch low pressure in central Quebec will
continue to track east today. A trailing 29.9 inch low pressure
trough will then linger across the Upper Great Lakes through
tonight before dropping south on Sunday. As 30.5 inch high
pressure builds into northern Ontario on Sunday, low pressure of
29.5 inches will begin to organize near the Oklahoma Panhandle.
This low will then lift northeast, tracking across northern Lower
Michigan Tuesday morning. As the low reaches the Canadian
Maritimes on Wednesday, high pressure of 30.3 inches will shift
across the Upper Great Lakes.

LSZ162-202245-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
942 AM EST Sat Jan 20 2018 /842 AM CST Sat Jan 20 2018/

.REST OF TODAY...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots. Waves calm to 2 feet building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots diminishing to less than
10 knots by midnight. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots becoming northeast 10 to
20 knots by late morning, then increasing to 15 to 25 knots by
mid afternoon. Waves building to 3 to 5 feet occasionally to
7 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. A slight chance of freezing rain.
A slight chance of snow after midnight. Freezing spray after
midnight. Waves building to 5 to 8 feet occasionally to 10 feet.
.MONDAY...Northeast gales to 40 knots. Freezing spray. A chance
of snow, possibly mixed with freezing rain. Waves building to
8 to 11 feet occasionally to 14 feet.
.MONDAY NIGHT...Northeast gales to 40 knots becoming north gales
to 35 knots after midnight. Freezing spray. A chance of snow.
Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-202245-
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-
942 AM EST Sat Jan 20 2018

.REST OF TODAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves 2 to 4 feet subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots becoming southwest less than
10 knots by midnight. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots becoming northeast 10 to
20 knots by late morning, then increasing to 15 to 25 knots by
mid afternoon. A slight chance of freezing rain. Waves building
to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Freezing spray after midnight. A
slight chance of freezing rain and snow after midnight. Waves
building to 5 to 8 feet occasionally to 10 feet.
.MONDAY...Northeast gales to 40 knots. Freezing spray. A chance
of snow. Waves building to 8 to 11 feet occasionally to 14 feet.
.MONDAY NIGHT...Northeast gales to 40 knots. Freezing spray. Snow
likely. Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray. A chance of snow. Waves subsiding to
1 to 3 feet.
.WEDNESDAY...North winds 5 to 15 knots backing southwest. Waves
subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-202245-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
942 AM EST Sat Jan 20 2018

.REST OF TODAY...Northwest winds 10 to 20 knots becoming north
5 to 15 knots by late morning, then backing west by mid
afternoon. Waves 3 to 5 feet occasionally to 7 feet subsiding to
calm to 2 feet.
.TONIGHT...Southwest winds less than 10 knots. Waves calm to
2 feet.
.SUNDAY...North winds 5 to 15 knots becoming northeast 10 to
20 knots by late morning, then increasing to 15 to 25 knots by
mid afternoon. A slight chance of freezing rain. Waves building
to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots. Freezing spray. A
slight chance of snow, possibly mixed with freezing rain after
midnight. Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...East winds 15 to 25 knots becoming northeast 20 to
30 knots in the afternoon. Freezing spray. A chance of snow.
Waves building to 6 to 9 feet occasionally to 11 feet.
.MONDAY NIGHT...Northeast gales to 35 knots. Freezing spray. Snow
likely. Waves building to 6 to 10 feet occasionally to 13 feet.
.TUESDAY...North winds 20 to 30 knots becoming northeast 15 to
25 knots. Heavy freezing spray. A chance of snow. Waves subsiding
to 2 to 4 feet.
.WEDNESDAY...East winds 5 to 15 knots veering southwest. A chance
of snow. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-202245-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
942 AM EST Sat Jan 20 2018

.REST OF TODAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves 2 to 4 feet subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing south by midnight,
then veering west late. Waves calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots veering north by late
morning, then becoming northeast 10 to 20 knots by mid afternoon.
A slight chance of rain and freezing rain in the afternoon. Waves
building to 2 to 4 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots veering east after
midnight. A chance of freezing rain. A chance of snow after
midnight. Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...East winds 20 to 30 knots backing northeast in the
afternoon. Freezing spray. A chance of snow in the morning. Snow
likely in the afternoon. Waves building to 7 to 10 feet
occasionally to 13 feet.
.MONDAY NIGHT...Northeast gales to 35 knots. Freezing spray.
Snow. Waves building to 8 to 11 feet occasionally to 14 feet,
then subsiding to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. Heavy freezing spray. Snow likely, then a chance of
snow. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 10 to 20 knots backing southwest. A
chance of snow. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-202245-
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-
942 AM EST Sat Jan 20 2018

.REST OF TODAY...West winds 10 to 20 knots veering northwest by
late morning, then becoming west 5 to 15 knots by mid afternoon.
Waves 5 to 8 feet occasionally to 10 feet subsiding to 1 to
3 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest late.
Waves subsiding to calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots becoming northeast 15 to
25 knots by mid afternoon. A slight chance of freezing rain.
Waves building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots veering east after
midnight. A slight chance of freezing rain and snow after
midnight. Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...East winds 20 to 30 knots. Freezing spray. A chance of
snow in the morning. Snow likely in the afternoon. Waves building
to 7 to 10 feet occasionally to 13 feet.
.MONDAY NIGHT...Northeast gales to 35 knots. Freezing spray.
Snow. Waves building to 8 to 11 feet occasionally to 14 feet,
then subsiding to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...North gales to 35 knots diminishing to 15 to 25 knots.
Freezing spray. Snow likely. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots veering southwest. A
chance of snow. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-202245-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
942 AM EST Sat Jan 20 2018

.REST OF TODAY...West winds 10 to 20 knots veering northwest by
late morning, then diminishing to 5 to 15 knots by mid afternoon.
Waves 5 to 8 feet occasionally to 10 feet subsiding to 1 to
3 feet.
.TONIGHT...South winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.SUNDAY...South winds 5 to 15 knots backing northeast by late
morning, then increasing to 10 to 20 knots by mid afternoon.
Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots becoming east
15 to 25 knots after midnight. A slight chance of freezing rain
and snow after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.MONDAY...East winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon. Freezing spray in the afternoon. Snow likely in
the afternoon. Waves building to 5 to 8 feet occasionally to
10 feet.
.MONDAY NIGHT...East gales to 35 knots becoming northeast 20 to
30 knots after midnight. Freezing spray. Snow. Waves 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...Northeast winds 20 to 30 knots becoming north 15 to
25 knots. Freezing spray. Snow likely. Waves subsiding to 2 to
4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots veering southwest. A
chance of snow. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-202245-
MAFOR 2016/
Superior West 13510 13600 11700 11810. Waves 3 feet or less.

Superior North Central 11810 11100 11400 13500 11600 11810. Waves
1 to 4 feet.

Superior South Central 11610 11600 11500 12400 11500 11600 11700.
Waves 1 to 4 feet.

Superior East 11730 11710 12500 12400 11500 11800. Waves 4 to 7
feet subsiding to 3 to 5 feet this afternoon. Waves 3 feet or less
tonight through Sunday morning.

$$

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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