Great Lakes Forecast
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FZUS63 KMQT 151348
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
948 AM 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 over Lake Huron will moves northeast
into Quebec this afternoon 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 stronger trough of low pressure of 29.7 inches will move through
the upper Great Lakes on Wednesday before being replaced with a
30.1 inch ridge of high pressure for Thursday.

LSZ162-152200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
948 AM EDT Sun Oct 15 2017 /848 AM CDT Sun Oct 15 2017/

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

$$

LSZ263-152200-
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-
948 AM EDT Sun Oct 15 2017

.REST OF TODAY...North winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then backing west late. Isolated
showers by late morning. Waves 4 to 7 feet occasionally to 9 feet
subsiding to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots. Isolated showers. Waves
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
3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots veering west after
midnight. Waves building to 4 to 8 feet occasionally to 10 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 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 1 to 3 feet.
.THURSDAY...Southwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ264-152200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
948 AM EDT Sun Oct 15 2017

...GALE WARNING IN EFFECT UNTIL 10 AM EDT THIS MORNING...

.REST OF TODAY...North winds 15 to 25 knots becoming northwest
10 to 20 knots late. Isolated showers by late morning. Waves 5 to
8 feet occasionally to 10 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
3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots veering west after
midnight. 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 1 to 3 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots veering west. Waves
building to 5 to 8 feet occasionally to 10 feet, then 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 2 to 4 feet.

$$

LSZ265-152200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
948 AM EDT Sun Oct 15 2017

...GALE WARNING IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...North gales to 40 knots diminishing to 20 to
30 knots in the afternoon, then becoming northwest 15 to 25 knots
late. Numerous showers by late morning, then isolated showers by
mid afternoon. Waves 8 to 11 feet occasionally to 14 feet
subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots. Isolated showers. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.MONDAY...West winds 15 to 25 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 5 to 15 knots
by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves building to 1 to 3 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots veering west. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.THURSDAY...West winds 10 to 20 knots backing southwest. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ266-152200-
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-
948 AM EDT Sun Oct 15 2017

...GALE WARNING IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...North gales to 40 knots diminishing to 20 to
30 knots in the afternoon, then becoming northwest 15 to 25 knots
late. Scattered showers. Waves 8 to 11 feet occasionally to
14 feet subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming west 5 to
15 knots after midnight. Isolated showers. Waves subsiding to
1 to 3 feet.
.MONDAY...West winds 15 to 25 knots. 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
20 to 30 knots after midnight. Waves building to 5 to 8 feet
occasionally to 10 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 1 to 3 feet, then
building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 10 to 20 knots becoming south 15 to
25 knots. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.

$$

LSZ267-152200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
948 AM EDT Sun Oct 15 2017

...GALE WARNING IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...North gales to 40 knots diminishing to 20 to
30 knots late. Showers by late morning, then scattered showers by
mid afternoon. Waves 8 to 11 feet occasionally to 14 feet
subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 5 to
15 knots after midnight, then backing west late. Isolated
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 1 to 3 feet.
.WEDNESDAY...South winds 20 to 30 knots veering west. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 10 to 20 knots backing south. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.

$$
LSZ261-152200-
MAFOR 1515/
Superior West 11720 11710 15620. Waves 3 to 5 feet subsiding to 1
to 3 feet tonight through Monday morning.

Superior North Central 11830 11820 11720 12710 12610 11620. Waves
4 to 7 feet subsiding to 1 to 3 feet tonight through Monday
morning.


Superior South Central...Gale Warning in effect...11850 11840
11730 11720 12610 12620. Scattered showers early this afternoon.
Waves 6 to 10 feet subsiding to 3 to 7 feet this evening. Waves
subsiding to 1 to 4 feet Monday morning.


Superior East...Gale Warning in effect...11856 11840 12730 11820
11800 11400 11510. Scattered showers early this afternoon. Waves
5 to 9 feet subsiding to 1 to 4 feet tonight through Monday
morning.


$$

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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