Great Lakes Forecast
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FZUS63 KMQT 211920
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
320 PM EDT Sat Apr 21 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 will prevail
through the weekend before shifting slowly off the Eastern Seaboard
on Monday. A weak 30.1 inch trough will follow across Lake Superior
Monday night into Tuesday as the ridge exits the upper Great Lakes
region. Another high pressure ridge of 30.2 inches will follow on
Wednesday. As the second ridge exits Wednesday evening, another
trough at 29.8 inches will move into northern Ontario on Wednesday
night and across Lake Superior through Thursday.

LSZ162-220330-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
320 PM EDT Sat Apr 21 2018 /220 PM CDT Sat Apr 21 2018/

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds less than 10 knots veering south after
midnight, then backing north late. Waves calm to 2 feet.
.SUNDAY...South winds less than 10 knots veering southwest in the
afternoon, then backing south late. 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 northwest
after midnight. 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 5 to 15 knots veering southwest. Waves
calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering north.
Scattered rain showers, possibly mixed with snow. Waves building
to 1 to 3 feet.

$$

LSZ263-220330-
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-
320 PM EDT Sat Apr 21 2018

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds less than 10 knots. Waves calm to 2 feet.
.SUNDAY...South winds less than 10 knots veering southwest in the
afternoon, then becoming south 5 to 15 knots late. Waves calm to
2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest late.
Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves building to 1 to
3 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves subsiding to calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.
.THURSDAY...Northwest winds 15 to 25 knots becoming north 20 to
30 knots. Scattered rain showers, possibly mixed with snow. Waves
building to 2 to 4 feet.

$$

LSZ264-220330-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
320 PM EDT Sat Apr 21 2018

.TONIGHT...South winds 5 to 15 knots. 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 increasing to 10 to
20 knots after midnight, then veering southwest late. 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...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.
.THURSDAY...Northwest winds 20 to 30 knots becoming north gales
to 35 knots. Scattered rain and snow showers. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ265-220330-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
320 PM EDT Sat Apr 21 2018

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...South winds less than 10 knots becoming southeast 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots late. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves building to 1 to 3 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south. Waves
subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 15 to 25 knots becoming north 20 to
30 knots. Scattered rain showers, possibly mixed with snow. Waves
building to 2 to 4 feet.

$$

LSZ266-220330-
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-
320 PM EDT Sat Apr 21 2018

.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast late. 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 1 to 3 feet.
.MONDAY NIGHT...South winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. 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 20 to 30 knots diminishing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...Southwest winds 15 to 25 knots becoming north 20 to
30 knots. Scattered rain and snow showers. Waves building to 3 to
5 feet occasionally to 7 feet.

$$

LSZ267-220330-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
320 PM EDT Sat Apr 21 2018

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming southeast less than
10 knots after midnight, then becoming south 5 to 15 knots late.
Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast in the
afternoon. 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 building to 1 to
3 feet, then subsiding to calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots becoming northwest 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming south 5 to
15 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots becoming north 15 to
25 knots. Scattered rain showers and snow showers. Waves building
to 2 to 4 feet.

$$

LSZ261-220330-
MAFOR 2121/
Superior West 11400 12300 11400 11100 11400 12500. Waves 1 foot
or less.

Superior North Central 14400 11400 11300 12400. Waves 1 foot or
less.

Superior South Central 11200 13300 12400 12300. Waves 1 foot or
less.

Superior East 12200 13300 12400 11300. Waves 1 foot or less.

$$

07

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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