Great Lakes Forecast
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FZUS63 KMQT 091508
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1008 AM EST Tue Jan 9 2018

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...High pressure of 30.9 inches over the Great Lakes
will slide east, reaching southern New England Wednesday morning.
Meanwhile, low pressure of 29.5 inches over southern Manitoba
will progress eastward into northern Ontario on Wednesday before
a weakening low of 29.3 inches moves through the Great Lakes on
Thursday. A high of 30.8 inches will then push into the central
United States Friday and Saturday.

LSZ162-092315-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1008 AM EST Tue Jan 9 2018 /908 AM CST Tue Jan 9 2018/

.REST OF TODAY...East winds less than 10 knots becoming southeast
5 to 15 knots by late morning, then backing east by mid
afternoon. Waves 1 to 3 feet.
.TONIGHT...Southeast winds 10 to 20 knots diminishing to 5 to
15 knots by midnight, then becoming south 10 to 20 knots late. A
slight chance of drizzle after midnight. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...South winds 10 to 20 knots veering southwest by late
morning, then diminishing to 5 to 15 knots by mid afternoon. A
slight chance of rain showers in the morning. Waves 2 to 4 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight. A chance of rain showers, possibly
mixed with snow in the evening, then snow showers, possibly mixed
with rain and freezing rain after midnight. Waves 2 to 4 feet.
.THURSDAY...North gales to 35 knots diminishing to 20 to 30 knots
in the afternoon. Areas of blowing snow. Snow showers in the
morning. Snow showers likely in the 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...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of snow showers. Waves 3 to
6 feet occasionally to 8 feet.
.FRIDAY...North winds 5 to 15 knots. A chance of snow showers.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...North winds 5 to 15 knots backing northwest. Waves
3 to 5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-092315-
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-
1008 AM EST Tue Jan 9 2018

.REST OF TODAY...South winds 5 to 15 knots backing southeast by
mid afternoon. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south by
midnight, then increasing to 15 to 25 knots late. Waves building
to 2 to 4 feet.
.WEDNESDAY...South winds 15 to 25 knots veering southwest by late
morning, then diminishing to 10 to 20 knots by mid afternoon. A
slight chance of rain showers, possibly mixed with snow in the
morning. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots becoming north
15 to 25 knots after midnight. Areas of fog in the evening. A
chance of rain showers, possibly mixed with snow in the evening,
then snow showers, possibly mixed with rain and freezing rain
after midnight. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.THURSDAY...North gales to 40 knots. Heavy freezing spray. A
chance of freezing rain in the morning. Snow showers. Waves
building to 6 to 10 feet occasionally to 13 feet.
.THURSDAY NIGHT...North gales to 35 knots diminishing to 15 to
25 knots after midnight. Heavy freezing spray in the evening. A
chance of snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...North winds 10 to 20 knots. A chance of snow showers.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.SATURDAY...North winds 5 to 15 knots. A chance of snow showers.
Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-092315-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1008 AM EST Tue Jan 9 2018

.REST OF TODAY...South winds less than 10 knots increasing to
5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...Southeast winds 15 to 25 knots becoming south 20 to
30 knots by midnight. A few gale force gusts to 35 knots late. A
slight chance of drizzle and snow after midnight. Waves building
to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...South winds 20 to 30 knots with a few gale force
gusts to 35 knots in the morning, then becoming southwest 10 to
20 knots by mid afternoon. A slight chance of rain and snow
showers in the morning. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots becoming north
15 to 25 knots after midnight. Areas of fog. A chance of rain
showers, possibly mixed with snow in the evening. Snow showers,
possibly mixed with rain and freezing rain after midnight. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...North gales to 40 knots. Heavy freezing spray. A
chance of freezing rain in the morning. Snow showers. Waves
building to 8 to 11 feet occasionally to 14 feet.
.THURSDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. Heavy freezing spray. A chance of snow
showers. Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.SATURDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of snow showers. Waves subsiding to calm to
2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-092315-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1008 AM EST Tue Jan 9 2018

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

.REST OF TODAY...West winds 5 to 15 knots backing south by late
morning, then increasing to 10 to 20 knots by mid afternoon.
Waves calm to 2 feet building to 1 to 3 feet.
.TONIGHT...South winds 15 to 25 knots increasing to gales to
35 knots after midnight. A slight chance of drizzle and snow
after midnight. Waves building to 4 to 7 feet occasionally to 9
feet.
.WEDNESDAY...South winds 20 to 30 knots diminishing to 10 to
20 knots. A slight chance of rain showers, possibly mixed with
snow in the morning. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Areas of fog. A chance of rain showers
in the evening. Rain showers after midnight. Waves calm to
2 feet.
.THURSDAY...North winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. Areas of fog in the morning. Freezing
spray in the afternoon. Rain showers in the morning. Snow
showers, possibly mixed with freezing rain. Waves building to
8 to 11 feet occasionally to 14 feet.
.THURSDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. Heavy freezing spray. Snow showers.
Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.FRIDAY...Northwest winds 15 to 25 knots veering north. A chance
of snow showers, then snow showers likely. Waves subsiding to
1 to 3 feet, then building to 2 to 4 feet.
.SATURDAY...North winds 15 to 25 knots backing northwest. A
chance of snow showers, then snow showers likely. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to calm to
2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-092315-
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-
1008 AM EST Tue Jan 9 2018

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

.REST OF TODAY...Northwest winds 5 to 15 knots backing southwest
by late morning, then becoming south 10 to 20 knots by mid
afternoon. Waves 2 to 4 feet subsiding to 1 to 3 feet.
.TONIGHT...South winds 15 to 25 knots increasing to gales to
35 knots after midnight. A slight chance of drizzle and snow
after midnight. Waves building to 6 to 9 feet occasionally to 11
feet.
.WEDNESDAY...South gales to 40 knots diminishing to 15 to
25 knots by mid afternoon. A slight chance of snow showers in the
morning. A chance of rain showers. Areas of fog in the afternoon.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots. Areas of fog. A
slight chance of rain showers in the evening. Rain showers,
possibly mixed with snow after midnight. Waves subsiding to calm
to 2 feet.
.THURSDAY...North gales to 40 knots. Areas of fog in the morning.
Freezing spray in the afternoon. Rain showers, possibly mixed
with snow in the morning. Freezing rain. Snow showers in the
afternoon. Waves building to 9 to 12 feet occasionally to
15 feet.
.THURSDAY NIGHT...North gales to 40 knots. Heavy freezing spray.
Snow showers. Waves subsiding to 6 to 9 feet occasionally to
11 feet.
.FRIDAY...North winds 20 to 30 knots. Freezing spray. A chance of
snow showers. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.SATURDAY...North winds 15 to 25 knots. Freezing spray. A chance
of snow showers, then snow showers likely. Waves subsiding to
1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-092315-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1008 AM EST Tue Jan 9 2018

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

.REST OF TODAY...North winds 5 to 15 knots backing southwest by
late morning, then becoming south 10 to 20 knots by mid
afternoon. Waves 2 to 4 feet subsiding to calm to 2 feet.
.TONIGHT...South winds 15 to 25 knots increasing to gales to
35 knots after midnight. A slight chance of snow after midnight.
Waves building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...South gales to 35 knots diminishing to 20 to
30 knots by mid afternoon. A chance of snow showers, possibly
mixed with freezing rain in the morning. A chance of rain
showers. Areas of fog in the afternoon. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...South winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Areas of fog. A chance of rain
showers in the evening. Rain showers likely after midnight. Waves
subsiding to calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots becoming northwest 20 to
30 knots in the afternoon. Areas of fog in the morning. Rain
showers. Freezing rain and snow showers in the afternoon. Waves
building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. Heavy freezing spray and areas of
blowing snow. Snow showers likely. Waves building to 4 to 8 feet
occasionally to 10 feet.
.FRIDAY...North winds 15 to 25 knots. Waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-092315-
MAFOR 0916/
Superior West 12300 13320 11420 11430 11530. Waves calm to 3
feet.

Superior North Central 12410 11420 11330 14440. Waves 2 feet or
less this afternoon. Waves 1 to 3 feet building to 5 to 8 feet
tonight. Waves 5 to 8 feet Wednesday morning.

Superior South Central...Gale Warning in effect...11510 12420
11430 11440 13450. Waves 2 feet or less this afternoon. Waves 2
to 4 feet building to 4 to 7 feet tonight. Waves 4 to 7 feet
Wednesday morning.

Superior East...Gale Warning in effect...11600 11510 11420 11430
12440 12450. Chance of rain and snow showers through mid morning,
then chance of rain showers late Wednesday morning. Waves 1 to 3
feet this afternoon building to 4 to 7 feet tonight. Waves 5 to 9
feet Wednesday morning.

$$

Petro

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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