Great Lakes Forecast
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000
FZUS63 KMQT 201954
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
354 PM EDT Fri Oct 20 2017

For waters beyond five 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 29.1 inch low pressure over the Canadian Prairies
will track toward Western Hudson Bay this weekend, passing a 29.7
inch trough across Lake Superior Saturday night. Weak ridging of
30.0 inches will track eastward across Lake Superior late Sunday
ahead of a 29.7 inch trough that will cross Lake Superior Monday
night. Ridging will build to 30.1 Tuesday into Wednesday.

LSZ162-210400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
354 PM EDT Fri Oct 20 2017 /254 PM CDT Fri Oct 20 2017/

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...South winds 15 to 25 knots. A slight chance of showers
after midnight. Waves building to 1 to 3 feet.
.SATURDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots late. A chance of showers. A chance of thunderstorms by
mid afternoon. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots becoming west 15 to
25 knots late. Showers and a chance of thunderstorms. Waves
building to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots by mid afternoon. A slight chance of showers through
early afternoon. Waves 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.MONDAY...Southwest winds 15 to 25 knots veering west by mid
afternoon. A chance of showers. Waves subsiding to 2 to 4 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots veering north
after midnight. A chance of showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.TUESDAY...North winds 20 to 30 knots backing northwest. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
1 to 3 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.

$$

LSZ263-210400-
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-
354 PM EDT Fri Oct 20 2017

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...South winds 15 to 25 knots. Waves building to 1 to
3 feet.
.SATURDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots late. A chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering southwest
late. A chance of showers through midnight. A chance of
thunderstorms. Showers after midnight. Waves building to 2 to
4 feet.
.SUNDAY...West winds 15 to 25 knots backing southwest by mid
afternoon. A chance of showers through early afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots. Waves subsiding
to 2 to 4 feet, then building to 3 to 5 feet occasionally to
7 feet.
.MONDAY...Southwest winds 10 to 20 knots veering west by mid
afternoon. A chance of showers. Waves 3 to 5 feet occasionally to
7 feet.
.MONDAY NIGHT...Northwest winds 10 to 20 knots becoming north
20 to 30 knots after midnight. A chance of rain showers. Waves
subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...North winds 20 to 30 knots. A chance of rain showers.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 2 to 4 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots. Waves subsiding to
1 to 3 feet, then building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ264-210400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
354 PM EDT Fri Oct 20 2017

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves 1 to
3 feet.
.TONIGHT...South winds 10 to 20 knots. Waves building to 2 to
4 feet.
.SATURDAY...South winds 15 to 25 knots. A chance of showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots. A chance of showers
and thunderstorms. Waves 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Southwest winds 15 to 25 knots. Showers through early
afternoon, then a slight chance of showers by mid afternoon.
Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots. Waves subsiding
to 2 to 4 feet, then building to 3 to 5 feet occasionally to
7 feet.
.MONDAY...Southwest winds 10 to 20 knots veering west by mid
afternoon. A chance of showers. Waves 3 to 5 feet occasionally to
7 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots becoming north
20 to 30 knots after midnight. A chance of showers. Waves
subsiding to 2 to 4 feet, then building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...North gales to 35 knots. A chance of rain showers.
Waves building to 8 to 11 feet occasionally to 14 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots. Waves subsiding to
1 to 3 feet, then building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ265-210400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
354 PM EDT Fri Oct 20 2017

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...South winds 15 to 25 knots. Waves building to 2 to
4 feet.
.SATURDAY...South winds 15 to 25 knots. A slight chance of
showers by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots. A chance of showers
and a slight chance of thunderstorms. Waves subsiding to 2 to
4 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots
by mid afternoon. Showers through early afternoon, then a slight
chance of showers by mid afternoon. Waves subsiding to 1 to
3 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.MONDAY...Southwest winds 15 to 25 knots veering west by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Northwest winds 15 to 25 knots becoming north
20 to 30 knots after midnight. A chance of showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North gales to 35 knots. A chance of rain showers.
Waves building to 9 to 12 feet occasionally to 15 feet, then
subsiding to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.

$$

LSZ266-210400-
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-
354 PM EDT Fri Oct 20 2017

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves 2 to
4 feet.
.TONIGHT...South winds 20 to 30 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.SATURDAY...South winds 20 to 30 knots. A slight chance of
showers by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots. A chance of showers
and a slight chance of thunderstorms. Waves 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...South winds 15 to 25 knots becoming west 10 to 20 knots
by mid afternoon. Showers through early afternoon, then a chance
of showers by mid afternoon. Waves 3 to 6 feet occasionally to
8 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...South winds 15 to 25 knots veering southwest by mid
afternoon. Waves 2 to 4 feet.
.MONDAY NIGHT...West winds 10 to 20 knots becoming north 15 to
25 knots after midnight. A chance of showers. Waves building to
3 to 6 feet occasionally to 8 feet.
.TUESDAY...North gales to 40 knots. A chance of rain showers.
Waves building to 10 to 14 feet occasionally to 18 feet, then
subsiding to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming south 15 to
25 knots. Waves subsiding to 1 to 3 feet, then building to 3 to
6 feet occasionally to 8 feet.

$$

LSZ267-210400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
354 PM EDT Fri Oct 20 2017

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...South winds 15 to 25 knots. Waves building to 2 to
4 feet.
.SATURDAY...South winds 20 to 30 knots. A slight chance of
showers by mid afternoon. Waves 2 to 4 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots. A slight chance of
showers. A slight chance of thunderstorms after midnight. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.SUNDAY...South winds 20 to 30 knots becoming west 10 to 20 knots
by mid afternoon. Showers. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots. A chance of
showers through midnight. Waves 1 to 3 feet.
.MONDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.MONDAY NIGHT...West winds 10 to 20 knots becoming north 15 to
25 knots after midnight. A chance of showers. Waves building to
2 to 4 feet.
.TUESDAY...North gales to 40 knots. Rain showers, then a chance
of rain showers. Waves building to 9 to 12 feet occasionally to
15 feet, then subsiding to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots backing south. Waves
subsiding to 1 to 3 feet, then building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ261-210400-
MAFOR 2021/
Superior West 11310 15430 11420. Chance of showers from late
morning on Saturday. Waves 1 to 4 feet through Saturday.

Superior North Central 14420 14430. Waves 1 to 4 feet building to
3 to 6 feet Saturday.

Superior South Central 11420 15430 11430. Waves 1 to 4 feet
through Saturday.

Superior East 11420 15430 11430. Waves 2 to 4 feet building to 3
to 5 feet tonight through Saturday.

$$

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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