Great Lakes Forecast
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FZUS63 KMQT 191331
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
931 AM EDT Thu Apr 19 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 30.0 inches over Lake Superior will build
to 30.4 inches through Monday morning before shifting slowly into
the lower Great Lakes.

LSZ162-192145-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
931 AM EDT Thu Apr 19 2018 /831 AM CDT Thu Apr 19 2018/

.REST OF TODAY...West winds less than 10 knots becoming southwest
5 to 15 knots in the afternoon. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west late. Waves
calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots diminishing to less than
10 knots in the afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds less than 10 knots veering southwest
after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds less than 10 knots backing south by
mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds less than 10 knots veering
southwest after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots veering southwest. Waves
building to 1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-192145-
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-
931 AM EDT Thu Apr 19 2018

.REST OF TODAY...Northwest winds 5 to 15 knots becoming west less
than 10 knots in the afternoon, then becoming southwest 5 to
15 knots late. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots diminishing to less than
10 knots late. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds less than 10 knots. Waves calm to
2 feet.
.SATURDAY...Southwest winds less than 10 knots backing south by
mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds less than 10 knots. Waves calm to
2 feet.
.SUNDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves building to 2 to 4 feet.
.MONDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-192145-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
931 AM EDT Thu Apr 19 2018

.REST OF TODAY...North winds 10 to 20 knots becoming northwest
5 to 15 knots in the afternoon, then backing west late. Waves
2 to 4 feet subsiding to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.SATURDAY AND SATURDAY NIGHT...South winds 5 to 15 knots. Waves
calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves building to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-192145-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
931 AM EDT Thu Apr 19 2018

.REST OF TODAY...Northwest winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots becoming east less than
10 knots late. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds less than 10 knots. Waves calm to
2 feet.
.SATURDAY...South winds less than 10 knots becoming east 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves building to 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-192145-
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-
931 AM EDT Thu Apr 19 2018

.REST OF TODAY...North winds 15 to 25 knots becoming northwest
10 to 20 knots in the afternoon, then increasing to 15 to
25 knots late. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then backing west late. Waves subsiding
to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds less than 10 knots backing south
after midnight. Waves calm to 2 feet.
.SATURDAY...South winds less than 10 knots becoming east 5 to
15 knots by mid 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 increasing to 10 to 20 knots.
Waves building to 2 to 4 feet.
.MONDAY...South winds 10 to 20 knots veering southwest. Waves
subsiding to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-192145-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
931 AM EDT Thu Apr 19 2018

.REST OF TODAY...North winds 15 to 25 knots backing northwest in
the afternoon. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering west in the
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds less than 10 knots backing south after
midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds less than 10 knots becoming northeast
5 to 15 knots by mid 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 increasing to 10 to 20 knots.
Waves building to 2 to 4 feet.
.MONDAY...South winds 10 to 20 knots. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-192145-
MAFOR 1915/
Superior West 11600 11500 11510 12500 12600 11500. Waves 2 feet
or less.

Superior North Central 12710 14610 12600. Waves 1 to 3 feet.

Superior South Central 13720 12610 13600. Waves 3 to 5 feet
subsiding to 2 to 4 feet this afternoon. Waves 1 to 3 feet
tonight. Waves 1 foot or less Friday morning.

Superior East 11820 13720 12710 11600 11500. Waves 3 to 5 feet
this afternoon subsiding to 2 to 3 feet tonight. Waves 1 to 2
feet Friday morning.

$$

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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