Great Lakes Forecast
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FZUS63 KMQT 100235
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
935 PM 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 30.3 inches over the Lower Great
Lakes will build to 30.5 inches as it moves off the coast of New
England midday Wednesday. A trough of 29.4 inches extending from
western Ontario to the central Plains Wednesday morning will cross
the Upper Great Lakes Thursday at 29.6 inches and reach the East
Coast Friday. High pressure of 30.8 inches over the Canadian
Rockies Friday will reach the Mid Mississippi Valley Sunday at
30.6 inches, as a 30.4 inch ridge crosses the Upper Great Lakes.

LSZ162-101045-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
935 PM EST Tue Jan 9 2018 /835 PM CST Tue Jan 9 2018/

.REST OF TONIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots late. Waves 1 to 3 feet.
.WEDNESDAY...South winds 15 to 25 knots veering southwest by late
morning, then becoming south 10 to 20 knots by mid afternoon. A
slight chance of drizzle. Waves building to 2 to 4 feet, then
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest by
midnight, then becoming north 10 to 20 knots late. A chance of
rain showers in the evening. A chance of snow showers. Rain
showers and freezing rain after midnight. Waves calm to 2 feet.
.THURSDAY...North winds 20 to 30 knots. Areas of blowing snow. A
chance of freezing rain in the morning. Snow showers. Waves
building to 4 to 7 feet occasionally to 9 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
subsiding to 1 to 3 feet.
.FRIDAY...North winds 5 to 15 knots. A chance of snow showers.
Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. Waves building to
1 to 3 feet.
.SATURDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-101045-
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-
935 PM EST Tue Jan 9 2018

.REST OF TONIGHT...Southeast winds 10 to 20 knots becoming south
15 to 25 knots by midnight. Waves 1 to 3 feet 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 snow in the morning. A slight chance of drizzle.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest by
midnight, then becoming north 15 to 25 knots late. A chance of
rain showers in the evening, then rain showers, possibly mixed
with freezing rain and snow showers 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 9 feet occasionally to 11 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 2 to 4 feet.
.FRIDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. A chance of snow showers. Waves subsiding to
calm to 2 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. A chance of snow
showers. Waves 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.
.SUNDAY...North winds 5 to 15 knots. A chance of snow showers.
Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-101045-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
935 PM EST Tue Jan 9 2018

.REST OF TONIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots with a few gale force gusts to 35 knots. Waves 3 to 5
feet occasionally to 7 feet 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 snow in the morning.
A slight chance of drizzle. Waves building to 7 to 10 feet
occasionally to 13 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest by
midnight, then becoming north 15 to 25 knots late. A chance of
rain showers in the evening, then freezing rain with rain
showers, possibly mixed with snow after midnight. Waves subsiding
to calm to 2 feet, then building to 2 to 4 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 15 to
25 knots after midnight. Heavy freezing spray. A chance of snow
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...North winds 10 to 20 knots backing northwest in the
afternoon. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of snow showers. Waves building
to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...North winds 10 to 20 knots. A chance of snow showers.
Waves subsiding to calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots veering north. A chance
of snow showers. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-101045-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
935 PM EST Tue Jan 9 2018

...GALE WARNING IN EFFECT FROM 1 AM TO 9 AM EST WEDNESDAY...

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

Note, wave height forecasts are for ice free areas.

$$

LSZ266-101045-
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-
935 PM EST Tue Jan 9 2018

...GALE WARNING IN EFFECT FROM 1 AM EST WEDNESDAY THROUGH
WEDNESDAY AFTERNOON...

.REST OF TONIGHT...South winds 20 to 30 knots increasing to gales
to 40 knots by midnight. Waves 3 to 6 feet occasionally to 8 feet
building to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY...South gales to 40 knots diminishing to 15 to
25 knots by mid afternoon. A slight chance of drizzle. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...South winds 15 to 25 knots diminishing to
10 to 20 knots by midnight, then veering southwest late. A chance
of rain showers in the evening, then rain showers likely after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest gales to 35 knots becoming north gales to
40 knots in the afternoon. Snow showers, possibly mixed with rain
and freezing rain. Freezing spray in the afternoon. Waves
building to 9 to 12 feet occasionally to 15 feet.
.THURSDAY NIGHT...North gales to 40 knots diminishing to north
winds 20 to 30 knots late. Heavy freezing spray. Snow showers
likely in the evening. A chance of snow showers after midnight.
Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.FRIDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Freezing spray in the morning. A
chance of snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...North winds 20 to 30 knots. A chance of snow
showers. Heavy freezing spray after midnight. Waves subsiding to
2 to 4 feet, then building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. Heavy freezing spray. A chance of snow showers, then
snow showers likely. Waves subsiding to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots backing west. A chance
of snow showers. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-101045-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
935 PM EST Tue Jan 9 2018

...GALE WARNING IN EFFECT FROM 1 AM EST WEDNESDAY THROUGH
WEDNESDAY AFTERNOON...

.REST OF TONIGHT...South winds 15 to 25 knots increasing to gales
to 35 knots. Waves 2 to 4 feet 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 slight chance of drizzle. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...South winds 15 to 25 knots. A chance of rain
showers in the evening, then 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. Rain showers. Snow showers, possibly
mixed with freezing rain in the afternoon. Waves building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY NIGHT...North winds 20 to 30 knots. Heavy freezing
spray. Patchy blowing snow after midnight. A chance of snow
showers. Waves building to 6 to 9 feet occasionally to 11 feet,
then subsiding to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...North winds 15 to 25 knots. Freezing spray in the
morning. Waves subsiding to 2 to 4 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Waves 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.
.SUNDAY...Southeast winds 10 to 20 knots veering south. Snow
showers likely, then a chance of snow showers. Waves subsiding to
calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-101045-
MAFOR 1004/
Superior West 11320 11420 11430 12530 12520 11510. Chance of rain
showers Wednesday evening. Waves 3 feet or less.

Superior North Central 14440 11440 11430 11420 11410. Chance of
rain showers Wednesday evening. Waves 3 to 8 feet overnight.
Waves 6 to 9 feet subsiding to 1 to 5 feet Wednesday and
Wednesday evening.

Superior South Central...Gale Warning in effect...11440 14450
11430 12420. Chance of rain showers Wednesday evening. Waves 3 to
7 feet overnight and Wednesday. Waves 1 to 3 feet Wednesday
evening.

Superior East...Gale Warning in effect...11440 14450 11440 11430
11420. Chance of rain showers Wednesday evening. Waves 3 to 6
feet building to 5 to 9 feet overnight and Wednesday. Waves 2 to
6 feet Wednesday evening.

$$

KCW

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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