Great Lakes Forecast
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244
FZUS63 KMQT 172054
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
354 PM EST Sat Feb 17 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 30.2 inch ridge over the Upper Peninsula will push
off to the southeast overnight. The center of the high will reach
New England 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 on Monday. A high pressure system of 30.6
inches will then cross into the northern Plains late Tuesday,
reaching the Great Lakes Wednesday evening.

LSZ162-180500-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
354 PM EST Sat Feb 17 2018 /254 PM CST Sat Feb 17 2018/

.LATE THIS AFTERNOON...West winds 10 to 20 knots.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
late.
.SUNDAY...South winds 5 to 15 knots becoming east 15 to 25 knots.
Patchy blowing snow. Snow.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots backing north by
midnight, then becoming northeast 10 to 20 knots late. Patchy
blowing snow in the evening. Snow.
.MONDAY...Northeast winds 15 to 25 knots. Areas of blowing snow.
A chance of snow.
.MONDAY NIGHT...Northeast winds 15 to 25 knots. Areas of blowing
snow. Snow likely.
.TUESDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Patchy blowing snow in the morning.
Snow likely in the morning, then a chance of snow in the
afternoon.
.TUESDAY NIGHT...North winds 5 to 15 knots backing northwest
after midnight. A chance of snow.
.WEDNESDAY...West winds 5 to 15 knots backing southwest. A chance
of snow.
.THURSDAY...Southwest winds 5 to 15 knots.

Note, waves omitted for ice covered areas.

$$

LSZ263-180500-
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-
354 PM EST Sat Feb 17 2018

.LATE THIS AFTERNOON...West winds 10 to 20 knots.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots late.
.SUNDAY...South winds 5 to 15 knots becoming east 10 to 20 knots.
Snow. Patchy blowing snow in the afternoon.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots backing north by
midnight. Areas of blowing snow. Snow likely in the evening.
.MONDAY...Northeast winds 15 to 25 knots. Areas of blowing snow.
A chance of snow in the morning. Snow likely in the afternoon.
.MONDAY NIGHT...Northeast winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Areas of blowing snow. Snow
likely.
.TUESDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Patchy blowing snow in the morning.
Snow in the morning, then a chance of snow in the afternoon.
.TUESDAY NIGHT...North winds 5 to 15 knots backing northwest
after midnight. A chance of snow.
.WEDNESDAY...West winds 5 to 15 knots backing southwest. A chance
of snow.
.THURSDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots.

Note, waves omitted for ice covered areas.

$$

LSZ264-180500-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
354 PM EST Sat Feb 17 2018

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Patchy blowing
snow.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Patchy blowing snow in the evening.
.SUNDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by late morning, then increasing to 15 to 25 knots by
mid afternoon. Snow likely in the morning, then snow in the
afternoon. Patchy blowing snow in the afternoon.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots backing north by
midnight. Patchy blowing snow. Snow likely in the evening.
.MONDAY...North winds 15 to 25 knots veering northeast in the
afternoon. Areas of blowing snow. A chance of snow.
.MONDAY NIGHT...Northeast winds 15 to 25 knots. Areas of blowing
snow. Snow likely.
.TUESDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Patchy blowing snow. Snow likely.
.TUESDAY NIGHT...North winds 5 to 15 knots. A chance of snow.
.WEDNESDAY...West winds 5 to 15 knots backing southwest. A chance
of snow.
.THURSDAY...Southwest winds 10 to 20 knots.

Note, waves omitted for ice covered areas.

$$

LSZ265-180500-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
354 PM EST Sat Feb 17 2018

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

Note, waves omitted for ice covered areas.

$$

LSZ266-180500-
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-
354 PM EST Sat Feb 17 2018

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 2 to
4 feet.
.TONIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...West winds 5 to 15 knots becoming south 10 to 20 knots
by late morning, then becoming southeast 20 to 30 knots by mid
afternoon. A chance of snow in the morning, then snow in the
afternoon. Patchy blowing snow in the afternoon. Waves subsiding
to calm to 2 feet, then building to 3 to 6 feet occasionally to
8 feet.
.SUNDAY NIGHT...South winds 20 to 30 knots becoming southwest
15 to 25 knots by midnight, then veering north late. Snow in the
evening, then a slight chance of snow after midnight. Patchy
blowing snow after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 1 to 3 feet.
.MONDAY...North winds 15 to 25 knots veering northeast in the
afternoon. Areas of blowing snow. Freezing spray in the
afternoon. A chance of snow in the morning. Snow, possibly mixed
with freezing rain in the afternoon. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.MONDAY NIGHT...Northeast winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Heavy freezing spray and areas of
blowing snow. Snow likely in the evening, with a chance of snow
after midnight. Waves building to 5 to 8 feet occasionally to 10
feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northeast winds 10 to 20 knots. Patchy blowing snow in
the morning. Snow likely. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. A chance of snow. Waves building to 2 to 4 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing west. A
chance of snow. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots backing south. Waves
building to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-180500-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
354 PM EST Sat Feb 17 2018

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 2 to
4 feet.
.TONIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots late. A slight chance of snow in the evening. 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.
.SUNDAY...West winds 10 to 20 knots backing south by late
morning, then becoming southeast 20 to 30 knots by mid afternoon.
A chance of snow in the morning, then snow likely in the
afternoon. Waves subsiding to calm to 2 feet, then building to
3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...South winds 20 to 30 knots with a few gale force
gusts to 35 knots becoming west 10 to 20 knots late. Patchy
blowing snow in the evening. Snow in the evening, then a chance of
snow, possibly mixed with freezing rain and freezing drizzle,
after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...North winds 10 to 20 knots becoming northeast 15 to
25 knots in the afternoon. A chance of snow in the morning, then
snow, possibly mixed with freezing rain in the afternoon. Heavy
freezing spray in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.MONDAY NIGHT...Northeast winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Heavy freezing spray. Freezing
rain likely in the evening. A chance of snow. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.TUESDAY...Northeast winds 10 to 20 knots. Snow likely, possibly
mixed with freezing rain. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. A chance of snow. Waves building to 2 to 4 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. A chance of snow. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots backing south. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-180500-
MAFOR 1722/
Superior West 13630 11620 11500 11310 12237. Waves omitted for
ice covered areas.

Superior North Central 11630 11620 11630 11620 11610 11400 11327
11347. Chance of snow late Sunday morning. Waves omitted for
ice covered areas.

Superior South Central 13620 11610 11600 11500 11327 11347.
Chance of snow late Sunday morning. Waves omitted for ice covered
areas.

Superior East 11630 11640 11741 11740 11730 11610 11410 11347.
Freezing spray overnight. Waves 2 to 4 feet building to 4 to 7
feet tonight, then subsiding to 2 to 4 feet Sunday.

$$

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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