Great Lakes Forecast
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653
FZUS63 KMQT 152030
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
330 PM EST Thu Feb 15 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...Tonight, a 30.2 inch ridge will move over Lake
Superior that will remain through Friday, associated with a 30.5
inch high over the central Plains. The aforementioned high will
shift to the northeastern U.S. by Saturday morning as a 29.7 inch
trough tracks across the Upper Great Lakes Saturday evening.
Brief ridging of 30.1 inches will then pass through the area on
Sunday followed by a trough of 29.7 inches moving in from the
southwest late on Monday that will pass to the south of Lake
Superior. High pressure of 30.6 inches will cross into the
northern Plains on Tuesday afternoon.

LSZ162-160430-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
330 PM EST Thu Feb 15 2018 /230 PM CST Thu Feb 15 2018/

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots.
.TONIGHT...Northwest winds 15 to 25 knots becoming west 10 to
20 knots late. Patchy blowing snow in the evening. A slight
chance of snow showers in the evening.
.FRIDAY...West winds 15 to 25 knots becoming southwest 20 to
30 knots. Patchy blowing snow.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots increasing to
20 to 30 knots late. Patchy blowing snow. A chance of snow after
midnight.
.SATURDAY...Southwest winds 15 to 25 knots veering west in the
afternoon. Patchy blowing snow. A chance of snow.
.SATURDAY NIGHT...West winds 10 to 20 knots.
.SUNDAY...Southwest winds 5 to 15 knots backing northeast in the
afternoon. Snow likely.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of snow. Patchy blowing
snow after midnight.
.MONDAY...Northeast winds 20 to 30 knots. Patchy blowing snow.
Snow likely.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. A chance of snow.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-160430-
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-
330 PM EST Thu Feb 15 2018

.LATE THIS AFTERNOON...North winds 5 to 15 knots. A slight chance
of snow showers.
.TONIGHT...Northwest winds 10 to 20 knots increasing to 15 to
25 knots by midnight, then backing west late. A slight chance of
snow showers.
.FRIDAY...West winds 15 to 25 knots increasing to 20 to 30 knots
by late morning, then backing southwest by mid afternoon. Patchy
blowing snow.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots increasing to
20 to 30 knots late. Patchy blowing snow. A chance of snow after
midnight.
.SATURDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots in the afternoon. Patchy blowing snow. A chance of snow.
.SATURDAY NIGHT...West winds 10 to 20 knots.
.SUNDAY...Southwest winds 5 to 15 knots backing east in the
afternoon. Snow likely.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Snow likely in the evening, then a
chance of snow after midnight. Patchy blowing snow after
midnight.
.MONDAY...Northeast winds 20 to 30 knots. Patchy blowing snow.
Snow.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Snow likely, then a chance of snow.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-160430-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
330 PM EST Thu Feb 15 2018

.LATE THIS AFTERNOON...North winds 10 to 20 knots. A slight
chance of snow showers.
.TONIGHT...North winds 5 to 15 knots becoming northwest 10 to
20 knots by midnight, then backing west late. A slight chance of
snow showers.
.FRIDAY...West winds 15 to 25 knots increasing to 20 to 30 knots
by late morning, then backing southwest by mid afternoon. Patchy
blowing snow.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots. Patchy blowing
snow after midnight. A slight chance of snow after midnight.
.SATURDAY...Southwest winds 20 to 30 knots veering west in the
afternoon. Patchy blowing snow. A chance of snow.
.SATURDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Patchy blowing snow in the evening. A
chance of snow.
.SUNDAY...West winds 5 to 15 knots backing south in the
afternoon. A chance of snow in the morning, then snow likely in
the afternoon.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of snow. Patchy blowing snow
after midnight.
.MONDAY...Northeast winds 20 to 30 knots. Patchy blowing snow. A
chance of snow. Snow likely.
.TUESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Patchy blowing snow. Snow likely, then a chance of
snow.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-160430-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
330 PM EST Thu Feb 15 2018

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Patchy
blowing snow. A slight chance of snow showers.
.TONIGHT...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by midnight, then increasing to 15 to 25 knots late. A
slight chance of snow showers. Patchy blowing snow after
midnight.
.FRIDAY...West winds 15 to 25 knots. Patchy blowing snow.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming south
20 to 30 knots late. A slight chance of snow after midnight.
.SATURDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots in the afternoon. Patchy blowing snow. A slight chance
of snow.
.SATURDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of snow.
.SUNDAY...West winds 10 to 20 knots backing south in the
afternoon. A chance of snow in the morning, then snow likely in
the afternoon.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Snow likely. Patchy blowing snow
after midnight.
.MONDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots. Patchy blowing snow. Snow.
.TUESDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots. Snow likely, then a chance of snow.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-160430-
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-
330 PM EST Thu Feb 15 2018

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Freezing
spray and patchy blowing snow. A chance of snow showers. Waves
4 to 7 feet occasionally to 9 feet.
.TONIGHT...Northwest winds 15 to 25 knots increasing to 20 to
30 knots late. A chance of snow showers. Patchy blowing snow
after midnight. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.FRIDAY...West winds 20 to 30 knots diminishing to 15 to 25 knots
by mid afternoon. A slight chance of snow showers in the morning.
Patchy blowing snow. Waves building to 4 to 7 feet occasionally
to 9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming south
20 to 30 knots late. Patchy blowing snow after midnight. A slight
chance of snow after midnight. Waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Patchy blowing snow. A chance of snow.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...West winds 15 to 25 knots. Patchy blowing snow
in the evening. A chance of snow. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots backing south in the
afternoon. A chance of snow in the morning, then snow likely in
the afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Snow likely in the evening, then a
chance of snow after midnight. Waves building to 2 to 4 feet.
.MONDAY...Northeast winds 20 to 30 knots. Patchy blowing snow.
Freezing spray. Snow. 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 15 to 25 knots backing northwest. Snow
likely, then a chance of snow. Waves subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-160430-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
330 PM EST Thu Feb 15 2018

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Freezing
spray and patchy blowing snow. A chance of snow showers. Waves
4 to 7 feet occasionally to 9 feet.
.TONIGHT...North winds 15 to 25 knots backing northwest late. A
chance of snow showers in the evening, then snow showers likely
after midnight. Freezing spray after midnight. Waves subsiding to
2 to 4 feet, then building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...Northwest winds 20 to 30 knots backing west by late
morning, then diminishing to 15 to 25 knots by mid afternoon.
Patchy blowing snow in the morning. Freezing spray. A chance of
snow showers. Waves building to 5 to 8 feet occasionally to 10
feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots becoming south
15 to 25 knots late. Waves subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...South winds 20 to 30 knots veering southwest in the
afternoon. Patchy blowing snow in the morning. A chance of snow
in the morning, then snow likely in the afternoon. Waves building
to 4 to 7 feet occasionally to 9 feet, then subsiding to 3 to
5 feet occasionally to 7 feet.
.SATURDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Snow likely in the evening, then a
chance of snow after midnight. Freezing spray after midnight.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...West winds 10 to 20 knots backing south in the
afternoon. A chance of snow in the morning, then snow likely in
the afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...East winds 10 to 20 knots backing northeast after
midnight. Snow likely in the evening, then a chance of snow after
midnight. Waves building to 1 to 3 feet.
.MONDAY...Northeast winds 20 to 30 knots. Snow. Freezing spray.
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 northwest
10 to 20 knots. Snow likely, then a chance of snow. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-160430-
MAFOR 1522/
Superior West 11720 13730 11630 12640 11540. Waves omitted for
mostly ice covered areas.

Superior North Central 11820 11710 12720 11620 11630 12640. Waves
omitted for mostly ice covered areas.

Superior South Central 11730 12720 11730 11740 11640 12630.
Chance of snow showers through tonight. Waves omitted for mostly
ice covered areas.

Superior East 11840 11830 11837 11737 12742 12642. Freezing spray
and a chance of snow showers. Waves 4 to 8 feet.

$$

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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