Great Lakes Forecast
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FZUS63 KMQT 122033
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
333 PM EST Tue Dec 12 2017

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 high pressure system averaging 30.2 inches will
slide from southern Manitoba into Ontario tonight. A secondary
low of 29.7 inches will then move into the lower Great Lakes on
Wednesday. Several weak low pressure systems will then form over
the western Great Lakes Thursday and Friday before a stronger low
of 29.5 inches approaches the area on Saturday.

LSZ162-130445-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
333 PM EST Tue Dec 12 2017 /233 PM CST Tue Dec 12 2017/

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots becoming southeast 10 to
20 knots late. Scattered snow showers in the evening, then
numerous snow showers after midnight. Waves building to 1 to
3 feet.
.WEDNESDAY...East winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. Snow showers. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots becoming north
10 to 20 knots by midnight, then diminishing to 5 to 15 knots
late. A chance of snow showers. Waves subsiding to 1 to 3 feet.
.THURSDAY...Northwest winds 5 to 15 knots. A slight chance of
snow showers. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A chance of snow showers. Waves
building to 1 to 3 feet.
.FRIDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. A chance of snow showers. Waves 1 to
3 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. A chance of snow showers. Waves subsiding to calm to
2 feet.
.SATURDAY...South winds 5 to 15 knots. A chance of snow showers.
Waves building to 1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.

$$

LSZ263-130445-
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-
333 PM EST Tue Dec 12 2017

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Isolated snow
showers. Waves 1 to 3 feet.
.TONIGHT...North winds 5 to 15 knots veering southeast by
midnight, then increasing to 10 to 20 knots late. Scattered snow
showers. Waves subsiding to calm to 2 feet, then building to 1 to
3 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots backing east by late
morning, then becoming northeast 15 to 25 knots by mid afternoon.
Snow showers likely in the morning, then a chance of snow showers
in the afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest in the
afternoon. A chance of snow showers. Waves subsiding to calm to
2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight. A chance of snow showers. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.FRIDAY...North winds 10 to 20 knots. A chance of snow showers.
Waves 1 to 3 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots becoming south 10 to
20 knots. A chance of snow showers. Waves building to 1 to
3 feet.
.SUNDAY...Southwest winds 10 to 20 knots. A chance of snow
showers. Waves subsiding to calm to 2 feet, then building to 2 to
4 feet.

$$

LSZ264-130445-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
333 PM EST Tue Dec 12 2017

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Scattered snow
showers. Waves 2 to 4 feet.
.TONIGHT...North winds 5 to 15 knots veering east by midnight,
then veering southeast late. Scattered snow showers. Waves
subsiding to calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. A chance of snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.THURSDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A slight chance of snow showers. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. A chance of snow showers. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots. A chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.SATURDAY...East winds 5 to 15 knots becoming southwest 10 to
20 knots. A chance of snow showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots. A chance of snow showers. Waves building to 2 to
4 feet.

$$

LSZ265-130445-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
333 PM EST Tue Dec 12 2017

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Freezing
spray. Scattered snow showers. Waves 3 to 6 feet occasionally to
8 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing west by
midnight, then backing southeast late. Scattered snow showers.
Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots becoming east 15 to
25 knots by late morning, then backing northeast by mid
afternoon. A chance of snow showers. Waves building to 2 to
4 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots diminishing to
15 to 25 knots by midnight. A chance of snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A chance of snow showers in the
evening, then snow showers likely after midnight. Waves subsiding
to calm to 2 feet, then building to 1 to 3 feet.
.FRIDAY...Northwest winds 15 to 25 knots veering north in the
afternoon. Snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. A chance of snow showers. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
2 to 4 feet.
.SATURDAY...North winds 10 to 20 knots veering south. A chance of
snow showers. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 15 to 25 knots. A chance of snow
showers. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.

$$

LSZ266-130445-
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-
333 PM EST Tue Dec 12 2017

.LATE THIS AFTERNOON...North winds 15 to 25 knots. Freezing
spray. Numerous snow showers. Waves 3 to 6 feet occasionally to
8 feet.
.TONIGHT...North winds 10 to 20 knots becoming east 5 to 15 knots
by midnight. Scattered snow showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY...East winds 10 to 20 knots increasing to 15 to
25 knots by late morning, then backing northeast by mid
afternoon. A chance of snow showers. Waves building to 2 to
4 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots diminishing to
15 to 25 knots by midnight. A chance of snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 15 to
25 knots in the afternoon. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A chance of snow showers in the
evening, then snow showers likely after midnight. Waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY...North winds 15 to 25 knots. Snow showers. Freezing
spray in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots. Freezing spray in the
evening. Snow showers likely in the evening, then a chance of
snow showers after midnight. Waves subsiding to 2 to 4 feet.
.SATURDAY...East winds 10 to 20 knots veering southwest. A chance
of snow showers. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.SUNDAY...South winds 15 to 25 knots veering southwest. A chance
of snow showers. Waves building to 2 to 4 feet.

$$

LSZ267-130445-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
333 PM EST Tue Dec 12 2017

.LATE THIS AFTERNOON...North winds 15 to 25 knots. Freezing
spray. Scattered snow showers. Waves 3 to 5 feet occasionally to
7 feet.
.TONIGHT...North winds 15 to 25 knots becoming northeast 5 to
15 knots by midnight, then becoming east 10 to 20 knots late.
Scattered snow showers. Waves subsiding to calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. A slight chance of snow showers. Waves
building to 1 to 3 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots backing north
by midnight. A chance of snow showers. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest in the
afternoon. A chance of snow showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Snow showers likely. Waves 1 to
3 feet.
.FRIDAY...North winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. Snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots. Snow showers likely
in the evening, then a chance of snow showers after midnight.
Waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet.
.SATURDAY...Northeast winds 10 to 20 knots veering south. A
chance of snow showers. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 15 to 25 knots veering southwest. A chance
of snow showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.

$$

LSZ261-130445-
MAFOR 1222/
Superior West 11600 11500 11417 12327 12237 11137. Scattered snow
showers late this evening. Waves 1 to 5 feet.

Superior North Central 11810 11100 11200 11300 12220 11230 11130.
Scattered snow showers this evening through late tonight. Chance
of snow showers Wednesday. Waves 1 to 5 feet.

Superior South Central 11827 11810 11800 11300 11310 11320 11220
11120. Freezing spray early this evening. Scattered snow showers.
Waves 1 to 5 feet.

Superior East 11820 11120 11110 12210 12220 11120. Scattered snow
showers tonight. Waves 1 to 5 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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