Great Lakes Forecast
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FZUS63 KMQT 152046
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
346 PM EST Mon Jan 15 2018

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 30.2 inch low over southern Lake Michigan this
afternoon will dissipate while drifting across the eastern Great
Lakes through Tuesday. Tuesday night through Wednesday night, Lake
Superior will be between 29.6 inch low pressure over far southern
Hudson Bay and 30.7 inch high pressure over the Middle Mississippi
Valley. A 29.8 inch trough will then drift from northern Ontario to
the Upper Great Lakes Thursday into Friday. A 29.3 inch low
pressure will then develop across southern Manitoba Friday
afternoon and track eastward to central Quebec by Saturday
evening.

LSZ162-160500-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
346 PM EST Mon Jan 15 2018 /246 PM CST Mon Jan 15 2018/

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY
EVENING...

.LATE THIS AFTERNOON...Northeast winds 20 to 30 knots. Freezing
spray. Snow showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northeast winds 20 to 30 knots with a few gale force
gusts before midnight. Freezing spray. Scattered snow showers.
Waves building to 6 to 9 feet occasionally to 11 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 10 to 20 knots backing west by mid
afternoon. Isolated snow showers. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots increasing to 20 to
30 knots by midnight. Heavy freezing spray after midnight. Waves
building to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...Southwest gales to 35 knots. Heavy freezing spray
and patchy blowing snow. Waves building to 8 to 11 feet
occasionally to 14 feet.
.WEDNESDAY NIGHT...Southwest gales to 35 knots becoming west
15 to 25 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Southwest winds 10 to 20 knots veering west in the
afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-160500-
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-
346 PM EST Mon Jan 15 2018

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH LATE
WEDNESDAY NIGHT...

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. Snow
showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northeast winds 20 to 30 knots with a few gale force
gusts to 35 knots before midnight. Freezing spray. Snow showers.
Waves building to 5 to 9 feet occasionally to 11 feet.
.TUESDAY...North winds 15 to 25 knots backing west by mid
afternoon. Freezing spray in the morning. Scattered snow showers.
Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY NIGHT...West winds 20 to 30 knots increasing to gales to
35 knots late. Isolated snow showers in the evening. Heavy
freezing spray. Waves building to 9 to 12 feet occasionally to
15 feet.
.WEDNESDAY...West gales to 40 knots becoming southwest gales to
35 knots in the afternoon. Heavy freezing spray. Waves building
to 10 to 14 feet occasionally to 18 feet.
.WEDNESDAY NIGHT...West gales to 35 knots diminishing to 20 to
30 knots after midnight. Waves subsiding to 7 to 10 feet
occasionally to 13 feet.
.THURSDAY...West winds 10 to 20 knots. Waves 7 to 10 feet
occasionally to 13 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.FRIDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots. Waves 6 to 9 feet occasionally to 11 feet.
.SATURDAY...West winds 10 to 20 knots. Waves subsiding to 5 to
8 feet occasionally to 10 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-160500-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
346 PM EST Mon Jan 15 2018

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH LATE
WEDNESDAY NIGHT...

.LATE THIS AFTERNOON...East winds 15 to 25 knots. Snow showers.
Waves 4 to 7 feet occasionally to 9 feet.
.TONIGHT...Northeast winds 20 to 30 knots backing north late.
Freezing spray. Snow showers. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then backing west by mid afternoon.
Freezing spray in the morning. Scattered snow showers. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots increasing to gales to
40 knots by midnight. Isolated snow showers in the evening.
Heavy freezing spray. Waves building to 9 to 12 feet occasionally
to 15 feet.
.WEDNESDAY...West gales to 40 knots. Heavy freezing spray. Waves
building to 12 to 17 feet occasionally to 21 feet, then subsiding
to 10 to 14 feet occasionally to 18 feet.
.WEDNESDAY NIGHT...West gales to 35 knots diminishing to 20 to
30 knots after midnight. Waves subsiding to 7 to 10 feet
occasionally to 13 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves 7 to 10 feet occasionally to
13 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves subsiding to 6 to 9 feet occasionally to
11 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots. A chance of snow, possibly mixed with rain. Waves 6 to
9 feet occasionally to 11 feet.
.SATURDAY...West winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to 5 to 8 feet occasionally to 10 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-160500-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
346 PM EST Mon Jan 15 2018

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY
EVENING...

.LATE THIS AFTERNOON...East winds 15 to 25 knots. Freezing spray.
Snow showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...East winds 15 to 25 knots backing northeast by
midnight. Freezing spray. Snow showers. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then backing northwest by mid
afternoon. Freezing spray in the morning. Snow showers. Waves 3
to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots increasing to gales to
35 knots. Scattered snow showers in the evening. Waves building
to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...West gales to 35 knots. Heavy freezing spray. Waves
building to 10 to 14 feet occasionally to 18 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. Waves subsiding to
9 to 12 feet occasionally to 15 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to 8 to 11 feet
occasionally to 14 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves subsiding to 7 to 10 feet occasionally to
13 feet.
.FRIDAY...South winds 10 to 20 knots becoming southwest 15 to
25 knots. Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 5 to 8 feet occasionally to 10 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-160500-
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-
346 PM EST Mon Jan 15 2018

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY
EVENING...

.LATE THIS AFTERNOON...East winds 20 to 30 knots. Snow showers.
Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...East winds 20 to 30 knots diminishing to 15 to
25 knots by midnight, then backing northeast late. Snow showers.
Freezing spray after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally
to 8 feet.
.TUESDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots by late morning, then backing northwest by mid
afternoon. Freezing spray in the morning. Scattered snow showers.
Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots increasing to gales to
40 knots. Scattered snow showers. Heavy freezing spray after
midnight. Waves building to 9 to 12 feet occasionally to 15 feet.
.WEDNESDAY...West gales to 40 knots. Heavy freezing spray in the
morning. Waves building to 12 to 17 feet occasionally to 21 feet,
then subsiding to 10 to 14 feet occasionally to 18 feet.
.WEDNESDAY NIGHT...West gales to 35 knots diminishing to 20 to
30 knots after midnight. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...South winds 15 to 25 knots veering southwest. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 15 to 25 knots. Waves subsiding to 1 to
3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-160500-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
346 PM EST Mon Jan 15 2018

...GALE WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY
EVENING...

.LATE THIS AFTERNOON...East winds 20 to 30 knots. Numerous snow
showers. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...East winds 15 to 25 knots backing northeast late.
Scattered snow showers. Waves subsiding to 2 to 4 feet.
.TUESDAY...Northeast winds 10 to 20 knots backing north by mid
afternoon. Scattered snow showers. Waves subsiding to calm to
2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots increasing to 20 to
30 knots. Scattered snow showers. Freezing spray after midnight.
Waves building to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...Southwest gales to 35 knots veering west in the
afternoon. Isolated snow showers in the morning. Heavy freezing
spray. Waves building to 8 to 12 feet occasionally to 15 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
4 to 7 feet occasionally to 9 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.FRIDAY...South winds 15 to 25 knots becoming southwest 20 to
30 knots. Waves building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves subsiding to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-160500-
MAFOR 1522/
Superior West 13147 19157 12840 11830 11810 11720. Freezing
spray. Snow showers. Waves 3 to 6 feet building to 5 to 9 feet
tonight, then subsiding to 1 to 2 feet Tuesday.

Superior North Central 11237 13147 11840 11830 11820 11710.
Freezing spray. Scattered snow showers. Waves 5 to 8 feet
tonight subsiding to 2 to 3 feet Tuesday.

Superior South Central 13237 12137 11837 11827 11720. Freezing
spray. Scattered snow showers. Waves 2 to 6 feet.

Superior East 11237 12230 13130 11120 11810. Freezing
spray. Scattered snow showers. Waves 3 to 5 feet tonight subsiding
to 1 to 3 feet Tuesday.

$$

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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