Great Lakes Forecast
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FZUS63 KMQT 201947
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
347 PM EDT Fri Apr 20 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 Lake Superior will stick
around through Monday morning before shifting slowly over the
lower Great Lakes. A weak 30.1 inch trough is expected to follow
on Monday night into Tuesday. A 29.9 inch low pressure system on
Tuesday will move from the northern Plains into the upper Great
Lakes through Wednesday while deepening to 29.7 inches.

LSZ162-210400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
347 PM EDT Fri Apr 20 2018 /247 PM CDT Fri Apr 20 2018/

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds less than 10 knots veering southwest
after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds less than 10 knots. Waves calm to
2 feet.
.SATURDAY NIGHT...East winds less than 10 knots backing northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...South winds less than 10 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots. A chance of rain showers,
possibly mixed with snow. Waves building to 1 to 3 feet.
.WEDNESDAY...East winds 5 to 15 knots veering southwest. Waves
subsiding to calm to 2 feet.

$$

LSZ263-210400-
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-
347 PM EDT Fri Apr 20 2018

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds less than 10 knots veering southwest late.
Waves calm to 2 feet.
.SATURDAY...Southwest winds less than 10 knots. Waves calm to
2 feet.
.SATURDAY NIGHT...Southeast winds less than 10 knots veering
south late. Waves calm to 2 feet.
.SUNDAY...South winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...North winds 5 to 15 knots increasing to 10 to
20 knots. A chance of rain showers, possibly mixed with snow.
Waves building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots becoming southwest
5 to 15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-210400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
347 PM EDT Fri Apr 20 2018

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southeast winds less than 10 knots becoming south
5 to 15 knots in the afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves building to 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots. Waves 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...North winds 10 to 20 knots. A chance of rain and snow
showers. Waves building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-210400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
347 PM EDT Fri Apr 20 2018

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering southwest late.
Waves calm to 2 feet.
.SATURDAY...South winds less than 10 knots becoming southeast
5 to 15 knots in the afternoon, then backing east late. Waves
calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming south 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots becoming west 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...North winds 10 to 20 knots. A chance of rain showers.
A chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ266-210400-
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-
347 PM EDT Fri Apr 20 2018

.LATE THIS AFTERNOON...South winds less than 10 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds less than 10 knots becoming east 5 to
15 knots late. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots. Waves building to
1 to 3 feet.
.MONDAY...South winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots increasing to 10 to
20 knots. A chance of rain showers. A chance of snow showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...North winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.

$$

LSZ267-210400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
347 PM EDT Fri Apr 20 2018

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds less than 10 knots increasing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots backing east late.
Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering south late.
Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots becoming north 10 to
20 knots. A chance of rain showers, possibly mixed with snow.
Waves building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ261-210400-
MAFOR 2021/
Superior West 11400 11300 11400 14500 11500. Waves 1 foot or
less.

Superior North Central 11500 14400 11300 11400 11500. Waves 1
foot or less.

Superior South Central 13300 14400 11300. Waves 1 foot or less.

Superior East 11400 15300 11300. Waves 1 foot 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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