Great Lakes Forecast
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FZUS63 KMQT 152001
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 PM EDT Sun Oct 15 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 low pressure system of 29.4 inches over southern
Quebec tonight will exit northeast as a high pressure of 30.4
inches will build into the Plains and extend a 30.1 inch ridge
into the Upper Great Lakes on Monday. A weak trough of 29.9 inches
will move through the Upper Great Lakes Monday night through
Tuesday night. A deeper trough of low pressure at 29.7 inches will
sweep through the Upper Great Lakes on Wednesday before being
replaced with a 30.1 inch ridge of high pressure on Thursday. A
29.9 inch trough moves into the Upper Great Lakes on Friday.

LSZ162-160415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 PM EDT Sun Oct 15 2017 /301 PM CDT Sun Oct 15 2017/

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

$$

LSZ263-160415-
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-
401 PM EDT Sun Oct 15 2017

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots. A slight chance of rain
showers after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon, then backing southwest late. Waves building to
4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots becoming west
15 to 25 knots late. Waves building to 6 to 9 feet occasionally
to 11 feet, then subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. 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 veering west by mid
afternoon. 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 10 to 20 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 10 to 20 knots backing southwest. Waves
subsiding to calm to 2 feet, then building 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.

$$

LSZ264-160415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 PM EDT Sun Oct 15 2017

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...West winds 5 to 15 knots. Waves subsiding to 1 to
3 feet.
.MONDAY...West winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon, then backing southwest late. Waves building to
4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots veering west late.
Waves building to 5 to 9 feet occasionally to 11 feet.
.TUESDAY...West winds 15 to 25 knots becoming southwest 5 to
15 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots veering west by mid
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.FRIDAY...South winds 5 to 15 knots. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.

$$

LSZ265-160415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 PM EDT Sun Oct 15 2017

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.MONDAY...West winds 15 to 25 knots. Waves building to 2 to
4 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots increasing to
gales to 35 knots after midnight, then becoming west 20 to
30 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 by mid afternoon. 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...Southwest winds 15 to 25 knots. 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.
.THURSDAY...West winds 15 to 25 knots becoming southwest 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.

$$

LSZ266-160415-
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-
401 PM EDT Sun Oct 15 2017

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots. Waves 4 to
8 feet occasionally to 10 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming west 5 to
15 knots after midnight. A slight chance of showers after
midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. A slight chance of showers through early
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots increasing to
gales to 35 knots after midnight, then becoming west 20 to
30 knots late. Waves building to 5 to 9 feet occasionally to
11 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 5 to 15 knots
by mid afternoon. 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 20 to 30 knots veering southwest by mid
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.
.THURSDAY...West winds 15 to 25 knots backing southwest. Waves
subsiding to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.

$$

LSZ267-160415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 PM EDT Sun Oct 15 2017

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

$$

LSZ261-160415-
MAFOR 1521/
Superior West 15620 11630 11530. Waves 1 to 5 feet.

Superior North Central 11720 13610 12620 12630. Waves 1 to 5 feet.

Superior South Central 11730 11720 14620 12630. Waves 4 to 7 feet
subsiding to 2 to 4 feet tonight and Monday.

Superior East 11740 11730 11720 11700 11500 11520 12630. Waves 4
to 7 feet subsiding to 2 to 5 feet tonight and Monday.

$$

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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