Great Lakes Forecast
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FZUS63 KMQT 220742
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
342 AM 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 will
persist today 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.

LSZ162-221545-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
342 AM EDT Sun Apr 22 2018 /242 AM CDT Sun Apr 22 2018/

.EARLY THIS MORNING...Southwest winds less than 10 knots. Waves
calm to 2 feet.
.TODAY...Southwest winds less than 10 knots backing south late.
Waves calm to 2 feet.
.TONIGHT...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
building to 1 to 3 feet.
.THURSDAY...North winds 15 to 25 knots. A chance of rain showers,
possibly mixed with snow. Waves 1 to 3 feet.

$$

LSZ263-221545-
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-
342 AM EDT Sun Apr 22 2018

.EARLY THIS MORNING...South winds less than 10 knots. Waves calm
to 2 feet.
.TODAY...South winds less than 10 knots veering southwest in the
afternoon, then becoming south 5 to 15 knots late. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest late.
Waves building to 1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. 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...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves building to 1 to 3 feet.
.THURSDAY...Northwest winds 15 to 25 knots becoming north 20 to
30 knots. A chance of rain and snow showers. Waves building to
3 to 6 feet occasionally to 8 feet.

$$

LSZ264-221545-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
342 AM EDT Sun Apr 22 2018

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...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 building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots becoming west 10 to
20 knots after midnight. 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 1 to 3 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...Southwest winds 15 to 25 knots becoming north gales
to 35 knots. A chance of rain and snow showers. Waves building to
5 to 8 feet occasionally to 10 feet.

$$

LSZ265-221545-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
342 AM EDT Sun Apr 22 2018

.EARLY THIS MORNING...South winds less than 10 knots. Waves calm
to 2 feet.
.TODAY...South winds 5 to 15 knots backing southeast in the
afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots becoming southwest 10 to
20 knots late. Waves 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 after
midnight. 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 veering south. Waves
subsiding to calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots becoming north 20 to
30 knots. A chance of rain showers, then snow showers, possibly
mixed with rain. Waves building to 6 to 9 feet occasionally to
11 feet.

$$

LSZ266-221545-
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-
342 AM EDT Sun Apr 22 2018

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...South winds 5 to 15 knots backing southeast late. Waves
calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots. Waves 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 subsiding to calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves 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 veering south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...South winds 15 to 25 knots becoming north 20 to
30 knots. A chance of rain showers. A chance of snow showers.
Waves building to 7 to 10 feet occasionally to 13 feet.

$$

LSZ267-221545-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
342 AM EDT Sun Apr 22 2018

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.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, then backing southeast late. Waves 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 building to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. A chance of rain showers through midnight. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 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 southeast 15 to
25 knots. A chance of rain showers. A chance of snow showers.
Waves building to 5 to 8 feet occasionally to 10 feet.

$$

LSZ261-221545-
MAFOR 2209/
Superior West 14500 12400 11410 11510. Waves 2 feet or less.

Superior North Central 15400 11410 11510. Waves 1 foot or less
today. Waves 1 to 3 feet tonight.

Superior South Central 13400 11300 12310 11420 11410. Waves 1
foot or less today. Waves 1 to 3 feet tonight.

Superior East 12300 11400 12300 11410 12420. Waves 1 foot or less
today. Waves 1 to 3 feet tonight.

$$

JLB

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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