Great Lakes Forecast
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FZUS63 KMQT 230132
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
932 PM EDT Sun Apr 22 2018

For waters beyond 5 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 ridge of 30.4 inches over the Great Lakes this
evening will shift slowly off the Eastern Seaboard on Monday. A
30.1 inch trough will follow across Lake Superior Monday night
into Tuesday. Another high pressure ridge of 30.2 inches will
follow on Wednesday. As the second ridge exits on Wednesday
evening, a trough of 29.8 inches moves into northern Ontario
through Wednesday night and then sweeps across Lake Superior
through Thursday. A 30.1 inch ridge shifts over the upper Great
Lakes on Friday as a 29.7 inch low over northwestern Ontario
tracks southward into the upper Great Lakes on early Saturday
morning.

LSZ162-230945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
932 PM EDT Sun Apr 22 2018 /832 PM CDT Sun Apr 22 2018/

.REST OF TONIGHT...South winds less than 10 knots becoming
southwest 5 to 15 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight, then veering north late. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...South winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves building to 1 to 3 feet.
.THURSDAY...Northwest winds 10 to 20 knots becoming north 15 to
25 knots. Scattered rain showers, possibly mixed with snow. Waves
subsiding to calm to 2 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...East winds 5 to 15 knots backing northwest. Waves
subsiding to calm to 2 feet.

$$

LSZ263-230945-
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-
932 PM EDT Sun Apr 22 2018

.REST OF TONIGHT...South winds 5 to 15 knots veering southwest
late. Waves calm to 2 feet building to 1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots veering north late.
Waves subsiding to calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...North winds less than 10 knots becoming southwest
5 to 15 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves building to 1 to 3 feet.
.THURSDAY...Southwest winds 10 to 20 knots becoming northeast
15 to 25 knots. Scattered rain showers, possibly mixed with snow.
Waves subsiding to calm to 2 feet, then building to 6 to 9 feet
occasionally to 11 feet.
.FRIDAY...Northeast winds 10 to 20 knots becoming south 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-230945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
932 PM EDT Sun Apr 22 2018

.REST OF TONIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then veering southwest late. Waves calm
to 2 feet building to 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots veering north
late. Waves subsiding to calm to 2 feet.
.TUESDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...North winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots. Waves building to
1 to 3 feet.
.THURSDAY...Southwest winds 10 to 20 knots becoming north 20 to
30 knots. Scattered rain showers. Waves subsiding to calm to
2 feet, then building to 7 to 10 feet occasionally to 13 feet.
.FRIDAY...North winds 10 to 20 knots backing southwest. Waves
subsiding to calm to 2 feet.

$$

LSZ265-230945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
932 PM EDT Sun Apr 22 2018

.REST OF TONIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then veering southwest late. Waves calm
to 2 feet building to 1 to 3 feet, then subsiding to calm to
2 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming south 5 to
15 knots in the afternoon, then backing southeast late. Waves
calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering west late.
Waves calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...North winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots becoming north 15 to
25 knots. Scattered rain and snow showers. Waves building to 7 to
10 feet occasionally to 13 feet.
.FRIDAY...North winds 10 to 20 knots backing west. Waves
subsiding to calm to 2 feet.

$$

LSZ266-230945-
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-
932 PM EDT Sun Apr 22 2018

.REST OF TONIGHT...South winds 10 to 20 knots. Waves calm to
2 feet building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.MONDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves 1 to 3 feet.
.MONDAY NIGHT...South winds 10 to 20 knots becoming southwest
5 to 15 knots late. Waves subsiding to calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots. Waves building to
3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 1 to 3 feet.
.THURSDAY...South winds 10 to 20 knots becoming north 20 to
30 knots. Scattered rain showers. Scattered snow showers. Waves
building to 7 to 10 feet occasionally to 13 feet.
.FRIDAY...North winds 15 to 25 knots becoming west 10 to
20 knots. Waves subsiding to 1 to 3 feet.

$$

LSZ267-230945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
932 PM EDT Sun Apr 22 2018

.REST OF TONIGHT...South winds 10 to 20 knots. Waves calm to
2 feet.
.MONDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots becoming northwest 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots backing north. Scattered
rain showers. Scattered snow showers. Waves building to 2 to
4 feet.
.FRIDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 1 to 3 feet.

$$
LSZ261-230945-
MAFOR 2303/
Superior West 11400 15510 11510. Waves 3 feet or less.

Superior North Central 11410 11510 15520. Waves 1 to 4 feet.

Superior South Central 12410 12510 11410 11400 11300 11410. Waves
3 feet or less.

Superior East 16410. Waves 3 feet or less.

$$

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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