Great Lakes Forecast
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FZUS63 KMQT 240248
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
948 PM EST Thu Nov 23 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 weakening high of 29.8 inches will move southeast
toward the Gulf Coast overnight before a 29.2 inch low moves
eastward just north of Lake Superior on Friday. The region will
then be dominated by a strengthening high of 30.1 inches passing
through the central United States Saturday through Monday morning.
A developing low pressure system of 29.2 inches will then push
through Manitoba and Ontario and impact the region Monday night
and into Tuesday.

LSZ162-241100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
948 PM EST Thu Nov 23 2017 /848 PM CST Thu Nov 23 2017/

.REST OF TONIGHT...Southwest winds 15 to 25 knots increasing to
20 to 30 knots by midnight. Waves 1 to 3 feet building to 4 to
7 feet occasionally to 9 feet.
.FRIDAY...Southwest winds 20 to 30 knots veering west by mid
afternoon. A chance of rain showers. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots with a few gale force
gusts to 35 knots before midnight. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally
to 8 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A slight chance of snow showers. Waves
subsiding to 1 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to calm to 2 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming west 15 to 25 knots.
Waves building to 2 to 4 feet.
.TUESDAY...West winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ263-241100-
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 PM EST Thu Nov 23 2017

...GALE WARNING IN EFFECT FROM 5 AM EST FRIDAY THROUGH LATE
FRIDAY NIGHT...

.REST OF TONIGHT...South winds 10 to 20 knots increasing to 20 to
30 knots by midnight with a few gale force gusts to 35 knots late.
Waves 1 to 3 feet building to 5 to 8 feet occasionally to 10 feet.
.FRIDAY...Southwest gales to 35 knots veering west by mid
afternoon. A chance of rain showers. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots veering northwest late.
A slight chance of rain showers. A slight chance of snow showers
after midnight. Waves building to 5 to 9 feet occasionally to
11 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A slight chance of snow showers. Waves
subsiding to 2 to 4 feet.
.SATURDAY NIGHT...West 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.
.SUNDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming southwest 15 to
25 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...West winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet.

$$

LSZ264-241100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
948 PM EST Thu Nov 23 2017

...GALE WARNING IN EFFECT FROM 5 AM EST FRIDAY THROUGH LATE
FRIDAY NIGHT...

.REST OF TONIGHT...South winds 10 to 20 knots increasing to 20 to
30 knots and veering southwest late. Isolated rain and snow
showers late in the evening. Waves calm to 2 feet building to 5 to
8 feet occasionally to 10 feet.
.FRIDAY...Southwest winds 20 to 30 knots with gale force gusts to
35 knots becoming west 20 to 30 knots by mid afternoon. Rain
showers likely especially in the afternoon. Waves building to 6 to
9 feet occasionally to 11 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY NIGHT...West gales to 35 knots veering northwest by
midnight. A slight chance of rain showers changing to snow after
midnight. Waves building to 8 to 12 feet occasionally to 15 feet.
.SATURDAY...Northwest winds 20 to 30 knots with a few gale force
gusts to 35 knots diminishing to 15 to 25 knots in the afternoon.
A chance of snow showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots becoming west
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northwest winds 15 to 25 knots. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain and snow showers. Waves building to 3
to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 15 to 25 knots veering northwest. A chance
of snow showers. Waves building to 3 to 6 feet occasionally to
8 feet.

$$

LSZ265-241100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
948 PM EST Thu Nov 23 2017

...GALE WARNING IN EFFECT FROM 7 AM EST FRIDAY THROUGH LATE
FRIDAY NIGHT...

.REST OF TONIGHT...South winds 15 to 25 knots becoming southwest
20 to 30 knots late. Waves calm to 2 feet building to 3 to 5 feet
occasionally to 7 feet.
.Friday...Southwest winds 20 to 30 knots veering west and
increasing to gales to 35 knots by mid afternoon. Rain showers
likely especially in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...West gales to 35 knots becoming northwest late. A
chance of rain showers changing to snow after midnight. Waves
building to 8 to 11 feet occasionally to 14 feet.
.SATURDAY...Northwest winds 20 to 30 knots with a few gale force
gusts to 35 knots early. A chance of snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots backing west
after midnight. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.
.SUNDAY...West winds 20 to 30 knots veering northwest in the
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming southwest 20 to
30 knots. A chance of rain showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.TUESDAY...West winds 20 to 30 knots veering northwest. A chance
of snow showers. Waves building to 3 to 6 feet occasionally to
8 feet.

$$

LSZ266-241100-
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 PM EST Thu Nov 23 2017

...GALE WARNING IN EFFECT FROM 7 AM EST FRIDAY THROUGH LATE
FRIDAY NIGHT...

.REST OF TONIGHT...Southwest winds 10 to 20 knots increasing to 20
to 30 knots with a few gale force gusts to 35 knots late.
Isolated rain and snow showers. Waves 2 to 4 feet building to 6 to
9 feet occasionally to 11 feet.
.FRIDAY...Southwest winds 20 to 30 knots with gale force gusts to
35 knots. Rain showers likely especially in the afternoon. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...West gales to 35 knots veering northwest by
midnight. A chance of rain showers changing to snow after
midnight. Waves building to 10 to 14 feet occasionally to 18
feet.
.SATURDAY...Northwest winds 20 to 30 knots with a few gales force
gusts to 35 knots early. A chance of rain and snow showers. Waves
subsiding to 6 to 9 feet occasionally to 11 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots backing west
after midnight. Waves subsiding to 2 to 4 feet, then building to
3 to 5 feet occasionally to 7 feet.
.SUNDAY...West winds 20 to 30 knots veering northwest in the
afternoon. Waves building to 5 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...South winds 15 to 25 knots increasing to 20 to
30 knots. A chance of rain showers. Waves subsiding to calm to
2 feet, then building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...West winds 20 to 30 knots veering northwest. A chance
of rain and snow showers. Waves building to 4 to 8 feet
occasionally to 10 feet.

$$

LSZ267-241100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
948 PM EST Thu Nov 23 2017

...GALE WARNING IN EFFECT FROM 7 AM EST FRIDAY THROUGH LATE
FRIDAY NIGHT...

.REST OF TONIGHT...Southwest winds 10 to 20 knots increasing to
20 to 30 knots with a few gale force gusts to 35 knots late.
Isolated rain and snow showers. Waves 2 to 4 feet increasing to 6
to 9 feet occasionally to 11 feet.
.FRIDAY...Southwest gales to 35 knots. Rain showers likely
especially in the afternoon. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...West gales to 35 knots veering northwest by
midnight. Rain showers possibly mixed with snow late. Waves
building to 10 to 14 feet occasionally to 18 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 20 to 30
knots early. A chance of rain and snow showers. Waves subsiding
to 6 to 9 feet occasionally to 11 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots backing west
after midnight. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.SUNDAY...West winds 15 to 25 knots becoming northwest 20 to
30 knots in the afternoon. A chance of snow showers, possibly
mixed with rain. Waves building to 5 to 8 feet occasionally to
10 feet.
.SUNDAY NIGHT...Northwest winds 20 to 30 knots becoming north
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...South winds 15 to 25 knots increasing to 20 to
30 knots. A chance of rain and snow showers. Waves subsiding to
calm to 2 feet, then building to 4 to 7 feet occasionally to 9
feet.
.TUESDAY...West winds 20 to 30 knots veering northwest. A chance
of rain showers. A chance of snow showers. Waves building to 4 to
8 feet occasionally to 10 feet.

$$
LSZ261-241100-
MAFOR 2404/
Superior West...Gale Warning in effect...11540 11550 13540 13640.
Chance of rain showers Friday. Waves 2 to 3 feet overnight
building to 4 to 7 feet Friday.

Superior North Central...Gale Warning in effect...12440 12540
11546 11646 11650 11750. Chance of rain showers Friday changing to
snow Friday night. Waves 4 to 7 feet overnight building to 6 to 10
feet Friday.

Superior South Central...Gale Warning in effect...11440 11450
12540 11540 11546 12650. Chance of showers. Waves 3 to 6 feet
overnight building to 5 to 7 feet Friday.

Superior East...Gale Warning in effect...11440 11450 11550 12540
12546 11656. Chance of rain showers. Waves 2 to 4 feet overnight
building to 6 to 10 feet Friday.

$$

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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