Great Lakes Forecast
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FZUS63 KMQT 171944
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
344 PM EDT Thu May 17 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 strengthening high pressure system of 30.2 inches
over Ontario will reach Southern Quebec on Friday at 30.4 inches.
A low pressure trough averaging 29.9 inches will track across
Lake Superior Saturday, followed by a high pressure system of 30.2
inches Sunday that will weaken to 30.1 inches Monday and Tuesday.

LSZ162-180345-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
344 PM EDT Thu May 17 2018 /244 PM CDT Thu May 17 2018/

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. A slight
chance of rain showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northeast winds 15 to 25 knots becoming east 10 to
20 knots after midnight. Waves subsiding to 2 to 4 feet.
.FRIDAY...East winds 5 to 15 knots backing northeast in the
afternoon, then increasing to 10 to 20 knots late. Waves
subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots veering south after
midnight. A slight chance of rain showers after midnight. Waves
subsiding to calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of rain showers. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. Waves calm to 2 feet.
.SUNDAY...North winds less than 10 knots becoming southwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds less than 10 knots veering west
after midnight. Waves calm to 2 feet.
.MONDAY...East winds less than 10 knots veering west. Waves calm
to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.

$$

LSZ263-180345-
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-
344 PM EDT Thu May 17 2018

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...East winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to 1 to 3 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves subsiding to calm to 2 feet, then building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight, then diminishing to 5 to 15 knots late. Waves
subsiding to 1 to 3 feet.
.SATURDAY...North winds 10 to 20 knots. A chance of rain showers.
Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots diminishing to less than
10 knots after midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds less than 10 knots becoming southwest
5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-180345-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
344 PM EDT Thu May 17 2018

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots becoming east 10 to
20 knots after midnight. A slight chance of rain showers through
midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots veering south
after midnight, then diminishing to 10 to 20 knots late. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet.
.SATURDAY...South winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. A chance of rain showers. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots veering southwest. Waves calm
to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.

$$

LSZ265-180345-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
344 PM EDT Thu May 17 2018

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots diminishing to
5 to 15 knots. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 1 to 3 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. A slight chance of rain showers by mid
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering southwest. Waves calm
to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ266-180345-
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-
344 PM EDT Thu May 17 2018

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots veering south
late. Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. A slight chance of rain showers by mid
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SATURDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.
.TUESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-180345-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
344 PM EDT Thu May 17 2018

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering east after
midnight, then becoming southeast 10 to 20 knots late. Waves calm
to 2 feet.
.FRIDAY...Southeast winds 15 to 25 knots. Waves building to 2 to
4 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots diminishing to
10 to 20 knots late. Waves subsiding to 1 to 3 feet.
.SATURDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves building to 1 to 3 feet.
.SUNDAY...North winds 5 to 15 knots becoming northwest 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots veering northwest. Waves calm
to 2 feet.

$$

LSZ261-180345-
MAFOR 1721/
Superior West 12130 11230 12220 12210 11120. Waves 2 to 6 feet.

Superior North Central 12100 13210 12320 11330. Waves calm to 4
feet.

Superior South Central 11100 11200 11210 11300 12310 12320. Waves
1 to 4 feet.

Superior East 11800 11810 11110 11210 11310 13320. Waves 1 to 4
feet.

$$

KEC

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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