Great Lakes Forecast
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FZUS63 KMQT 162012
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
412 PM EDT Mon Oct 16 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 30.1 inch ridge will exit the Upper Great Lakes
tonight as a 29.9 inch trough moves across Lake Superior through
Tuesday. A deeper trough of low pressure at 29.7 inches will sweep
through the Upper Great Lakes on Wednesday before being replaced
with a 30.0 inch ridge of high pressure on Thursday. A 29.9 inch
trough will approach the Upper Great Lakes on Friday and will
deepen to 29.7 inches on Saturday.

LSZ162-170415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
412 PM EDT Mon Oct 16 2017 /312 PM CDT Mon Oct 16 2017/

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TONIGHT...Southwest winds 15 to 25 knots becoming west 10 to
20 knots late. Waves building to 3 to 6 feet occasionally to
8 feet, then subsiding to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots backing southwest in the
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet, then building to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots. Waves subsiding to calm to
2 feet, then building to 2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots veering southwest. A
chance of showers. Showers likely. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.

$$

LSZ263-170415-
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-
412 PM EDT Mon Oct 16 2017

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west late.
Waves building to 4 to 8 feet occasionally to 10 feet.
.TUESDAY...West winds 10 to 20 knots backing southwest in the
afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight, then increasing to 15 to 25 knots late. Waves
subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots. Waves building to
4 to 7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.
.SATURDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet,
then building to 2 to 4 feet.

$$

LSZ264-170415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
412 PM EDT Mon Oct 16 2017

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west late.
Waves building to 4 to 8 feet occasionally to 10 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots late. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight, then increasing to 15 to 25 knots
late. Waves building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots. Waves 4 to 7 feet
occasionally to 9 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 4 to 7 feet occasionally
to 9 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots. A chance of showers.
Waves building to 2 to 4 feet.

$$

LSZ265-170415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
412 PM EDT Mon Oct 16 2017

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 1 to
3 feet.
.TONIGHT...Southwest winds 15 to 25 knots increasing to 20 to
30 knots after midnight, then becoming west 15 to 25 knots late.
Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then backing southwest late. Waves
subsiding to calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Waves building to 1 to 3 feet.
.WEDNESDAY...South winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.SATURDAY...South winds 15 to 25 knots. A chance of showers, then
showers likely. Waves building to 2 to 4 feet.

$$

LSZ266-170415-
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-
412 PM EDT Mon Oct 16 2017

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west late.
Waves building to 4 to 8 feet occasionally to 10 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then backing southwest late. Waves
subsiding to 2 to 4 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.WEDNESDAY...South winds 15 to 25 knots. Waves building to 4 to
7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 knots veering west
after midnight. Waves 4 to 7 feet occasionally to 9 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots. Waves building to 2 to
4 feet.
.SATURDAY...South winds 15 to 25 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ267-170415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
412 PM EDT Mon Oct 16 2017

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...Southwest winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...West winds 20 to 30 knots diminishing to 10 to
20 knots. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.WEDNESDAY...South winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY NIGHT...Southwest winds 20 to 30 knots veering west
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet.
.THURSDAY...West winds 20 to 30 knots. Waves building to 4 to
8 feet occasionally to 10 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots. Waves 1 to 3 feet.
.SATURDAY...South winds 15 to 25 knots. A chance of showers.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.

$$

LSZ261-170415-
MAFOR 1621/
Superior West 14530 12620 12510. Waves 3 to 7 feet subsiding
to 1 to 3 feet Tuesday.

Superior North Central 12530 12540 12630 11620 11520. Waves 3 to
6 feet building to 5 to 8 feet tonight. Waves 5 to 8 feet
subsiding to 3 to 5 feet Tuesday.

Superior South Central 12520 12530 12630 11620 11610. Waves 1 to
3 feet building to 3 to 5 feet tonight. Waves 3 to 6 feet
subsiding to 1 to 3 feet Tuesday.

Superior East 11630 11520 13530 11630 12620. Waves 3 to 7 feet.

$$

JSS

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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