Great Lakes Forecast
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FZUS63 KMQT 212050
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
350 PM EST Wed Feb 21 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 30.7 inch high pressure system over the Great Lakes
tonight will shift into southern Quebec on Thursday night. A weak
30.1 inch trough will then pass across the western Great Lakes on
Friday followed by weak a ridge of 30.3 inches on Saturday. A low
averaging 29.0 inches will track across the Great Lakes region
Saturday night through Sunday. A 30.3 inch ridge will then build
into the Upper Great Lakes on Monday as a 29.6 inch low moves
across southern Saskatchewan.

LSZ162-220500-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
350 PM EST Wed Feb 21 2018 /250 PM CST Wed Feb 21 2018/

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots.
.TONIGHT...Southwest winds 15 to 25 knots diminishing to 5 to
15 knots by midnight.
.THURSDAY...Southwest winds 5 to 15 knots backing south by late
morning, then backing east by mid afternoon.
.THURSDAY NIGHT...East winds 5 to 15 knots. A chance of snow in
the evening, then snow after midnight.
.FRIDAY...Southeast winds 5 to 15 knots veering west in the
afternoon. Snow likely in the morning.
.FRIDAY NIGHT...West winds 5 to 15 knots.
.SATURDAY...Southeast winds less than 10 knots becoming east
10 to 20 knots in the afternoon.
.SATURDAY NIGHT...East winds 10 to 20 knots backing northeast
after midnight. Snow.
.SUNDAY...West winds 15 to 25 knots. A chance of snow.
.MONDAY...Southwest winds 5 to 15 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-220500-
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-
350 PM EST Wed Feb 21 2018

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots.
.TONIGHT...Southwest winds 15 to 25 knots diminishing to 5 to
15 knots by midnight.
.THURSDAY...Southwest winds 5 to 15 knots backing south by late
morning, then backing east by mid afternoon.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots backing east
late. A chance of snow in the evening, then snow after midnight.
.FRIDAY...Southeast winds 5 to 15 knots veering west in the
afternoon. Snow likely in the morning, then a slight chance of
snow in the afternoon.
.FRIDAY NIGHT...West winds 5 to 15 knots.
.SATURDAY...South winds less than 10 knots becoming east 5 to
15 knots in the afternoon.
.SATURDAY NIGHT...East winds 15 to 25 knots. Snow.
.SUNDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of snow.
.MONDAY...Southwest winds 5 to 15 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-220500-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
350 PM EST Wed Feb 21 2018

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Patchy
blowing snow.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots late.
.THURSDAY...Southwest winds 5 to 15 knots backing south.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots diminishing to
5 to 15 knots by midnight. A slight chance of snow in the
evening, then snow after midnight.
.FRIDAY...South winds 5 to 15 knots veering west in the
afternoon. Snow in the morning, then a slight chance of snow in
the afternoon.
.FRIDAY NIGHT...West winds 5 to 15 knots.
.SATURDAY...South winds less than 10 knots becoming southeast
5 to 15 knots in the afternoon.
.SATURDAY NIGHT...East winds 15 to 25 knots. A chance of snow in
the evening, then snow after midnight.
.SUNDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots. Snow likely, then a chance of snow.
.MONDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-220500-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
350 PM EST Wed Feb 21 2018

.LATE THIS AFTERNOON...West winds 5 to 15 knots.
.TONIGHT...Southwest winds 5 to 15 knots.
.THURSDAY...Southwest winds 5 to 15 knots backing southeast by
late morning, then increasing to 10 to 20 knots by mid afternoon.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots. A slight chance
of snow in the evening, then snow after midnight.
.FRIDAY...Southeast winds 5 to 15 knots becoming west 10 to
20 knots in the afternoon. Snow in the morning. A chance of
freezing drizzle. A slight chance of snow in the afternoon.
.FRIDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight.
.SATURDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon.
.SATURDAY NIGHT...East winds 15 to 25 knots. A chance of snow in
the evening, then snow after midnight.
.SUNDAY...West winds 20 to 30 knots. A chance of snow.
.MONDAY...West winds 10 to 20 knots backing southwest. A chance
of snow.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-220500-
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-
350 PM EST Wed Feb 21 2018

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 1 to
3 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots by midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing southeast by
mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots. Snow after
midnight. Waves building to 2 to 4 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering west in the
afternoon. Snow, possibly mixed with freezing rain in the
morning. A chance of freezing drizzle. A slight chance of snow in
the afternoon. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 20 to 30 knots veering southeast
after midnight. A chance of snow in the evening, then snow after
midnight. Waves building to 4 to 7 feet occasionally to 9 feet.
.SUNDAY...West winds 20 to 30 knots. Snow likely, possibly mixed
with rain, then a chance of snow. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 5 to 8 feet occasionally
to 10 feet.
.MONDAY...West 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.

$$

LSZ267-220500-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
350 PM EST Wed Feb 21 2018

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots backing south by midnight,
then veering southwest late. Waves subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing south by late
morning, then backing southeast by mid afternoon. Waves calm to
2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots increasing to
15 to 25 knots by midnight. Snow likely after midnight. Waves
building to 2 to 4 feet.
.FRIDAY...Southeast winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon. Snow, possibly mixed with freezing
rain in the morning, then a chance of freezing drizzle in the
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.FRIDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves building to 2 to 4 feet, then
subsiding to calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 20 to 30 knots veering southeast
after midnight. Snow after midnight. Waves building to 3 to
6 feet occasionally to 8 feet.
.SUNDAY...West winds 20 to 30 knots. Snow. Waves building to 6 to
9 feet occasionally to 11 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...West 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.

$$

LSZ261-220500-
MAFOR 2122/
Superior West 11540 11520 12510 12500 11400 11300. Waves omitted
for mostly ice covered areas.

Superior North Central 11540 11530 11520 12510 11500 12400. Waves
omitted for mostly ice covered areas.

Superior South Central 11610 11500 11400 13500 11400 11300. Waves
omitted for mostly ice covered areas.

Superior East 12620 11520 11510 11610 11600 11500 11400. Waves 1
to 3 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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