Great Lakes Forecast
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942
FZUS63 KMQT 140804
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
404 AM EDT Sat Oct 14 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 30.2 inch ridge will briefly move over Lake
Superior today while low pressure of 29.7 inches organizes over
the Central Plains. Expect this low to deepen to 29.4 inches as
it tracks to the Upper Great Lakes tonight. This low will
strengthen to 29.3 inches as it reaches southern Quebec on Sunday
afternoon. In the wake of this low, high pressure of 30.4 inches
will track across the Southern Plains on Sunday and extend a
ridge of 30.1 inches over the Great Lakes on Monday. A weak
trough of 29.9 inches will quickly sweep over the Upper Great
Lakes area Monday into Tuesday, followed by a 30.1 inch ridge. On
Wednesday a 29.9 inch trough will then pass across the Upper
Great Lakes.

LSZ162-141615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
404 AM EDT Sat Oct 14 2017 /304 AM CDT Sat Oct 14 2017/

.EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...East winds 10 to 20 knots increasing to 15 to 25 knots
late. A chance of showers by mid afternoon. Waves building to
3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northeast winds 15 to 25 knots becoming north 20 to
30 knots late. Showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon, then becoming west 15 to 25 knots
late. A slight chance of showers through early afternoon. Waves
subsiding to 1 to 3 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 10 to 20 knots backing southwest. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots veering west. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
calm to 2 feet.

$$

LSZ263-141615-
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-
404 AM EDT Sat Oct 14 2017

.EARLY THIS MORNING...North winds 5 to 15 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.TODAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. A slight chance of rain showers by mid afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northeast winds 15 to 25 knots increasing to 20 to
30 knots after midnight, then backing north late. A few gale force
gusts to 35 knots. A chance of showers through midnight, then
showers after midnight. Waves building to 4 to 7 feet occasionally
to 9 feet.
.SUNDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon, then becoming west 10 to 20 knots
late. A chance of showers through early afternoon. Waves building
to 5 to 8 feet occasionally to 10 feet, then subsiding to 2 to
4 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 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 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 10 to 20 knots backing southwest. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots veering west. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.

$$

LSZ264-141615-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
404 AM EDT Sat Oct 14 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
MORNING...

.EARLY THIS MORNING...North winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TODAY...North winds 5 to 15 knots veering east in the afternoon.
A slight chance of showers by mid afternoon. Waves subsiding to
calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots increasing to 20 to
30 knots after midnight, then becoming north gales to 35 knots
late. Showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.SUNDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots late. A chance of showers through early afternoon. Waves
building to 6 to 9 feet occasionally to 11 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...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.
.WEDNESDAY...Southwest winds 10 to 20 knots veering west. Waves
building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ265-141615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
404 AM EDT Sat Oct 14 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
AFTERNOON...

.EARLY THIS MORNING...North winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. A chance of showers by mid afternoon. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.TONIGHT...East winds 15 to 25 knots becoming northeast 20 to
30 knots after midnight, then increasing to gales to 40 knots
late. Showers. Waves building to 8 to 11 feet occasionally to
14 feet.
.SUNDAY...North gales to 35 knots diminishing to 20 to 30 knots
in the afternoon, then becoming northwest 15 to 25 knots late.
Showers likely through early afternoon. Waves building to 9 to
12 feet occasionally to 15 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots backing west after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. Waves building 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 becoming southwest 10 to
20 knots. Waves subsiding to calm to 2 feet, then 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.

$$

LSZ266-141615-
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-
404 AM EDT Sat Oct 14 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
AFTERNOON...

.EARLY THIS MORNING...North winds 10 to 20 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...North winds 10 to 20 knots becoming northeast 5 to
15 knots in the afternoon, then becoming east 10 to 20 knots
late. A chance of showers by mid afternoon. Waves subsiding to
1 to 3 feet.
.TONIGHT...Northeast winds 10 to 20 knots increasing to gales to
40 knots. Showers. Waves building to 9 to 12 feet occasionally to
15 feet.
.SUNDAY...North gales to 40 knots becoming northwest 20 to
30 knots late. Showers through early afternoon, then a slight
chance of showers by mid afternoon. Waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. A slight chance of showers. Waves
subsiding to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by mid 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 becoming west
20 to 30 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...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.
.WEDNESDAY...South winds 15 to 25 knots veering west. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 5 feet occasionally to 7 feet.

$$

LSZ267-141615-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
404 AM EDT Sat Oct 14 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY
AFTERNOON...

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...North winds 10 to 20 knots becoming east 5 to 15 knots
in the afternoon, then becoming northeast 10 to 20 knots late. A
chance of showers by mid afternoon. Waves subsiding to 1 to
3 feet.
.TONIGHT...Northeast winds 15 to 25 knots increasing to gales to
40 knots. Showers. Waves building to 8 to 11 feet occasionally to
14 feet.
.SUNDAY...North gales to 40 knots. Showers through early
afternoon, then a chance of showers by mid afternoon. Waves
building to 10 to 14 feet occasionally to 18 feet, then subsiding
to 5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A slight chance of showers after
midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves subsiding to calm to 2 feet,
then building to 2 to 4 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 1 to 3 feet.
.WEDNESDAY...South winds 15 to 25 knots becoming west 20 to
30 knots. Waves building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ261-141615-
MAFOR 1409/

Superior West 12110 12220 11230 12136 11146 19156. Chance of
showers through early evening tonight. Waves 1 to 6 feet.

Superior North Central 11720 11810 11100 12210 11110 11136 11156.
Chance of showers this evening. Waves 1 to 6 feet.

Superior South Central 11810 11110 11100 11210 11220 11226 11136
11156. Chance of showers through early evening tonight. Waves 1
to 4 feet today. Waves building to 5 to 8 feet tonight.

Superior East 11720 11810 11100 11210 11110 11126 11136 11156.
Chance of showers through early evening tonight. Waves 2 to 6
feet today. Waves building to 4 to 7 feet tonight.

$$

Ritzman

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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