Great Lakes Forecast
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FZUS63 KMQT 202040
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
340 PM 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 weak 29.9 inch trough will shift across the
Upper Great Lakes through tonight before dissipating on Sunday. As
30.5 inch high pressure builds into northern Ontario midday Sunday,
low pressure of 29.5 inches will 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, building to 30.4 inches
overnight. Late Thursday, low pressure will begin to organize near
southern Alberta.

LSZ162-210445-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
340 PM EST Sat Jan 20 2018 /240 PM CST Sat Jan 20 2018/

...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH EARLY TUESDAY
MORNING...

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots becoming northeast 10 to
20 knots. A slight chance of freezing drizzle. A slight chance of
drizzle in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...Northeast winds 20 to 30 knots. A slight chance
of freezing drizzle. A slight chance of snow after midnight.
Freezing spray after midnight. Waves building to 6 to 9 feet
occasionally to 11 feet.
.MONDAY...Northeast gales to 35 knots. Freezing spray. A chance
of snow and a slight chance of freezing drizzle. Waves building
to 8 to 11 feet occasionally to 14 feet.
.MONDAY NIGHT...Northeast gales to 35 knots becoming north 20 to
30 knots late. 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 10 to
20 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast. Waves
calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-210445-
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-
340 PM EST Sat Jan 20 2018

...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH EARLY TUESDAY
MORNING...

.LATE THIS AFTERNOON...West winds 10 to 15 knots. Waves 1 to 3
feet subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest by
midnight. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots becoming northeast 10 to
20 knots. A slight chance of freezing drizzle. Waves building to
4 to 7 feet occasionally to 9 feet.
.SUNDAY NIGHT...Northeast winds 20 to 30 knots. A slight chance
of freezing drizzle and snow. Freezing spray after midnight.
Waves building to 6 to 9 feet occasionally to 11 feet.
.MONDAY...Northeast gales to 35 knots. Freezing spray. A chance
of snow and a slight chance of freezing drizzle. Waves building
to 8 to 11 feet occasionally to 14 feet.
.MONDAY NIGHT...Northeast gales to 35 knots backing north after
midnight. Freezing spray. Snow likely in the evening. A chance of
snow after midnight. Waves 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. A chance of snow.
Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots becoming northeast
5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering southwest. A
chance of snow showers. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing southeast.
Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-210445-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
340 PM EST Sat Jan 20 2018

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
AFTERNOON...

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots veering
southeast. Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots becoming northeast 15 to
25 knots. A slight chance of freezing drizzle. Waves building to
4 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots. Freezing spray. A
slight chance of freezing drizzle. A slight chance of snow after
midnight. Waves building to 5 to 8 feet occasionally to 10 feet.
.MONDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Freezing spray. A chance of snow and
freezing drizzle. Waves building to 6 to 9 feet occasionally to
11 feet.
.MONDAY NIGHT...Northeast gales to 35 knots. Heavy freezing
spray. Snow likely. 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. Heavy freezing spray. A chance of snow. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots becoming northeast
10 to 20 knots after midnight. Freezing spray in the evening.
Waves subsiding to 2 to 4 feet.
.WEDNESDAY...East winds 5 to 15 knots veering south. A chance of
snow showers. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves building to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-210445-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
340 PM EST Sat Jan 20 2018

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
AFTERNOON...

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest by
midnight, then veering west late. Waves calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots veering north by late
morning, then increasing to 10 to 20 knots by mid afternoon. A
slight chance of freezing drizzle in the afternoon. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots increasing to
20 to 30 knots late. A slight chance of drizzle in the evening. A
chance of freezing drizzle. Freezing spray after midnight. Waves
building to 5 to 8 feet occasionally to 10 feet.
.MONDAY...Northeast winds 20 to 30 knots. Freezing spray. A
chance of freezing drizzle and snow in the morning. Snow 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 7 to 11 feet occasionally to 14 feet.
.TUESDAY...North gales to 35 knots diminishing to 20 to 30 knots
in the afternoon. Heavy freezing spray. Snow in the morning. A
chance of snow in the afternoon. Waves building to 8 to 11 feet
occasionally to 14 feet, then subsiding to 6 to 9 feet
occasionally to 11 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 2 to 4 feet.
.WEDNESDAY...East winds 5 to 15 knots veering south. A chance of
snow showers. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots backing south. Waves
building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-210445-
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-
340 PM EST Sat Jan 20 2018

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
AFTERNOON...

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west late. Waves
subsiding to calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots becoming north 15 to
25 knots by late morning, then veering northeast by mid
afternoon. A slight chance of freezing drizzle. A slight chance
of drizzle in the afternoon. Waves building to 4 to 8 feet
occasionally to 10 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots becoming east
20 to 30 knots late. A slight chance of drizzle in the evening. A
slight chance of freezing drizzle. Waves building to 5 to 8 feet
occasionally to 10 feet.
.MONDAY...East winds 20 to 30 knots backing northeast in the
afternoon. Freezing spray. A slight chance of snow in the
morning. A slight chance of freezing drizzle. Snow 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 7 to 11 feet occasionally to 14 feet.
.TUESDAY...North gales to 35 knots. Freezing spray. Snow likely
in the morning. A chance of snow in the afternoon. Waves building
to 8 to 11 feet occasionally to 14 feet, then subsiding to 6 to
9 feet occasionally to 11 feet.
.TUESDAY NIGHT...North winds 20 to 30 knots becoming northeast
15 to 25 knots after midnight. Freezing spray in the evening. A
chance of snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...East winds 10 to 20 knots becoming south 5 to
15 knots. A chance of snow showers. Waves subsiding to calm to
2 feet.
.THURSDAY...Southwest winds 10 to 20 knots becoming south 15 to
25 knots. A chance of snow showers. Waves building to 2 to
4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-210445-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
340 PM EST Sat Jan 20 2018

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
AFTERNOON...

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves 2 to
4 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest late. A
slight chance of drizzle in the evening. Waves subsiding to calm
to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots backing northeast by late
morning, then increasing to 10 to 20 knots by mid afternoon. A
slight chance of freezing drizzle. A slight chance of drizzle in
the afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots veering east by
midnight. A slight chance of freezing drizzle after midnight.
Waves building to 4 to 7 feet occasionally to 9 feet.
.MONDAY...East winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon. A slight chance of freezing drizzle and snow in
the morning, then snow in the afternoon. Freezing spray in the
afternoon. Waves subsiding to 3 to 6 feet occasionally to 8 feet,
then building to 5 to 8 feet occasionally to 10 feet.
.MONDAY NIGHT...Northeast gales to 35 knots. Freezing spray.
Snow. Waves building to 5 to 9 feet occasionally to 11 feet.
.TUESDAY...North gales to 35 knots. Freezing spray. Snow likely
in the morning. A chance of snow in the afternoon. Waves subsiding
to 4 to 7 feet occasionally to 9 feet.
.TUESDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Freezing spray in the evening. A chance
of snow showers. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots veering south. A
chance of snow showers. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of snow showers. Waves building to 2 to
4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-210445-
MAFOR 2022/
Superior West 11510 14610 11810 11120 11130. Waves 1 to 4 feet.

Superior North Central 11400 12500 11510 11610 11820 12130. Waves
1 to 2 feet tonight building to 5 to 8 feet Sunday.

Superior South Central 11500 11600 12500 11600 11700 12810. Waves
1 to 3 feet.

Superior East 12500 11400 11500 11600 11800 11100 11110. Waves 1
to 4 feet.

$$

Kluber

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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