Great Lakes Forecast
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FZUS63 KMQT 181449
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
949 AM EST Thu Jan 18 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 29.7 inch trough will cross Lake Superior today
into early tonight. A 29.3 inch low pressure will then develop
across southern Manitoba Friday and track eastward to central
Quebec by midday Saturday. On Sunday morning, a 29.6 inch low over
the Colorado Rockies will eject into the central Plains and
deepen to 29.3 inches as it moves across the western Great Lakes
late Monday.

LSZ162-182300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
949 AM EST Thu Jan 18 2018 /849 AM CST Thu Jan 18 2018/

.REST OF TODAY...Southwest winds 20 to 30 knots becoming west
15 to 25 knots by late morning, then diminishing to 10 to
20 knots by mid afternoon. Isolated snow showers late in the
morning. Waves 3 to 5 feet occasionally to 7 feet subsiding to
1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots becoming southwest 10 to
20 knots late. Waves 1 to 3 feet.
.FRIDAY...Southwest winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing east
after midnight. Waves calm to 2 feet.
.SUNDAY...East winds 20 to 30 knots backing northeast. A chance
of snow showers, then snow showers likely. Freezing spray and
areas of blowing snow. Waves building to 8 to 11 feet
occasionally to 14 feet.
.MONDAY...Northeast gales to 40 knots. Freezing spray and areas
of blowing snow. Snow showers. Waves building to 10 to 14 feet
occasionally to 18 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-182300-
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-
949 AM EST Thu Jan 18 2018

.REST OF TODAY...Southwest winds 15 to 25 knots veering west by
late morning, then diminishing to 10 to 20 knots by mid
afternoon. Patchy blowing snow late in the morning. Scattered
snow showers late in the morning. Waves 3 to 6 feet occasionally
to 8 feet subsiding to 2 to 4 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
by midnight, then becoming southwest 10 to 20 knots late. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.FRIDAY...Southwest winds 15 to 25 knots. Isolated rain showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A slight chance of rain showers in the
evening. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing east after
midnight. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SUNDAY...East winds 20 to 30 knots. A chance of snow showers,
then snow showers likely. Freezing spray and patchy blowing snow.
Waves subsiding to calm to 2 feet, then building to 7 to 10 feet
occasionally to 13 feet.
.MONDAY...Northeast gales to 40 knots. Freezing spray and areas
of blowing snow. Snow showers. Waves building to 10 to 14 feet
occasionally to 18 feet, then subsiding to 8 to 11 feet
occasionally to 14 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-182300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
949 AM EST Thu Jan 18 2018

.REST OF TODAY...West winds 5 to 15 knots increasing to 10 to
20 knots by late morning, then becoming northwest 5 to 15 knots
by mid afternoon. Scattered snow showers late in the morning.
Areas of freezing drizzle. Waves 3 to 5 feet occasionally to
7 feet subsiding to 1 to 3 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing west by
midnight, then becoming southwest 10 to 20 knots late. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.FRIDAY...Southwest winds 15 to 25 knots. Isolated snow showers
in the morning. Scattered rain showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots. A chance of snow and
rain showers in the evening. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.SUNDAY...East winds 15 to 25 knots increasing to 20 to 30 knots.
A chance of snow showers, then snow showers likely. Freezing
spray. Waves building to 7 to 10 feet occasionally to 13 feet.
.MONDAY...Northeast gales to 40 knots. Heavy 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.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-182300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
949 AM EST Thu Jan 18 2018

.REST OF TODAY...Southwest winds 5 to 15 knots veering west by
late morning, then increasing to 10 to 20 knots by mid afternoon.
Isolated snow showers. Patchy freezing drizzle in the afternoon.
Waves calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots backing southwest late.
Waves calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming south 15 to
25 knots by late morning, then becoming southwest 10 to 20 knots
by mid afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
calm to 2 feet, then building to 2 to 4 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing east after
midnight. Waves calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 20 to 30 knots.
Snow showers likely. Waves building to 6 to 9 feet occasionally
to 11 feet.
.MONDAY...East winds 20 to 30 knots becoming northeast gales to
35 knots. Snow showers. Freezing spray. Waves building to 6 to
10 feet occasionally to 13 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-182300-
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-
949 AM EST Thu Jan 18 2018

.REST OF TODAY...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots by late morning, then becoming west 10 to 20 knots
by mid afternoon. Isolated snow showers. Patchy freezing drizzle
in the afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots backing southwest late.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming south 15 to
25 knots. Isolated snow showers in the morning. Scattered rain
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...Southwest winds 20 to 30 knots veering west after
midnight. A slight chance of rain and snow showers in the
evening. Waves building to 4 to 7 feet occasionally to 9 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots veering east
after midnight. A chance of freezing rain after midnight. Waves
subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 20 to 30 knots.
A chance of snow showers, then snow showers likely. Waves
building to 7 to 10 feet occasionally to 13 feet.
.MONDAY...East winds 20 to 30 knots becoming northeast gales to
35 knots. Snow showers. Freezing spray. Waves subsiding to 6 to
9 feet occasionally to 11 feet, then building to 8 to 11 feet
occasionally to 14 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-182300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
949 AM EST Thu Jan 18 2018

.REST OF TODAY...Southwest winds 10 to 20 knots backing south by
late morning, then becoming southwest 5 to 15 knots by mid
afternoon. Isolated snow showers. Patchy freezing drizzle in the
afternoon. Waves 3 to 5 feet occasionally to 7 feet subsiding to
calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots increasing to 10 to 20 knots
by midnight, then backing southwest late. Isolated snow showers
and patchy freezing drizzle in the evening. Waves building to
1 to 3 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming south 20 to
30 knots. Isolated snow showers in the morning. A chance of
sleet. Scattered rain showers, possibly mixed with freezing rain
in the afternoon. Waves building to 3 to 5 feet occasionally to
7 feet.
.FRIDAY NIGHT...Southwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. A slight chance of rain and snow
showers in the evening. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...West winds 15 to 25 knots. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots veering east
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 15 to 25 knots.
A chance of snow showers, then snow showers likely. Waves
building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...East winds 20 to 30 knots diminishing to 15 to
25 knots. Snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet, then building to 4 to 7 feet occasionally
to 9 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-182300-
MAFOR 1816/
Superior West 11630 13620 11610 11510 11520 11530. Waves 3 to 6
feet subsiding to 1 to 4 feet this afternoon through Friday
morning.

Superior North Central 11510 12710 11700 11600 11510 11520 11530.
Scattered snow showers late this morning, transitioning to patchy
light freezing drizzle through the mid afternoon. Waves 1 to 4
feet.

Superior South Central 11510 14620 12520 11420. Patchy light
freezing drizzle late this afternoon. Waves 3 feet or less.

Superior East 11510 11500 14610 12520. Patchy light freezing
drizzle through early evening tonight. Waves 1 to 4 feet.

$$

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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