Great Lakes Forecast
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FZUS63 KMQT 171344
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
944 AM 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
will settle over Ontario today and 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.

LSZ162-172145-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
944 AM EDT Thu May 17 2018 /844 AM CDT Thu May 17 2018/

.REST OF TODAY...Northeast winds 15 to 25 knots. A slight chance
of rain showers this afternoon. Waves 3 to 5 feet occasionally to
7 feet building to 4 to 7 feet occasionally to 9 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. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...East 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...Southwest winds 5 to 15 knots becoming northeast
10 to 20 knots by mid afternoon. A chance of rain showers. Waves
building to 1 to 3 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots backing north. Waves calm to
2 feet.

$$

LSZ263-172145-
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-
944 AM EDT Thu May 17 2018

.REST OF TODAY...Northeast winds 10 to 20 knots becoming 15 to 25
knots late. Waves 2 to 4 feet building to 4 to 7 feet
occasionally to 9 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 building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A slight chance of rain showers after
midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...South winds 5 to 15 knots becoming north 15 to
25 knots by mid afternoon. A chance of rain showers. 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 subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ264-172145-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
944 AM EDT Thu May 17 2018

.REST OF TODAY...East winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then backing northeast late. Waves
1 to 3 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 subsiding to 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 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots veering south
after midnight. Waves 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. 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 subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots increasing to 10 to 20 knots.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves calm to 2 feet.

$$

LSZ265-172145-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
944 AM EDT Thu May 17 2018

.REST OF TODAY...East winds 10 to 20 knots becoming northeast
5 to 15 knots late. Waves 2 to 4 feet subsiding to 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 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves building to 1 to 3 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west. Waves
subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ266-172145-
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-
944 AM EDT Thu May 17 2018

.REST OF TODAY...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots in the afternoon. Waves 2 to 4 feet subsiding to
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 becoming south
10 to 20 knots after midnight. 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. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots. Waves building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.MONDAY...North winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ267-172145-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
944 AM EDT Thu May 17 2018

.REST OF TODAY...Northeast winds 5 to 15 knots backing north in
the afternoon, then increasing to 10 to 20 knots late. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering southeast after
midnight, then increasing to 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 after midnight. 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...North winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots backing southeast. Waves
calm to 2 feet.

$$
LSZ261-172145-
MAFOR 1715/
Superior West 11120 13130 11230 12220 11210. Waves 3 to 6 feet
this afternoon subsiding to 2 to 4 feet Friday morning.

Superior North Central 12210 11100 11110 13210 11320. Waves 1 to
3 feet.

Superior South Central 11210 11110 12100 11200 13310. Waves 1 to
3 feet.

Superior East 11110 12800 11810 11110 12310 11320. Waves 1 to 3
feet.

$$

Borchardt

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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