Great Lakes Forecast
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FZUS63 KMQT 111459
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
959 AM EST Thu Jan 11 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...A trough of 29.5 inches extending from northern
Quebec through Upper Michigan to the southern Plains will cross
the Upper Great Lakes today at 29.6 inches and reach the East
Coast Friday evening. High pressure averaging 30.7 inches over the
Canadian Rockies Friday will reach the Mid Mississippi Valley
late Saturday night, extending a 30.5 inch ridge across the Upper
Great Lakes. The high will extend from Quebec to the Ohio Valley
Sunday. A 30.2 inch trough will pass across Wisconsin and Northern
Illinois Monday as a 31.0 inch high moves into the northern
Plains.

LSZ162-112300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
959 AM EST Thu Jan 11 2018 /859 AM CST Thu Jan 11 2018/

...GALE WARNING IN EFFECT UNTIL 7 PM EST /6 PM CST/ THIS
EVENING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH FRIDAY
MORNING...

.REST OF TODAY...North winds 20 to 30 knots increasing to gales
to 35 knots by late morning, then diminishing to 20 to 30 knots
by mid afternoon. Patchy fog late in the morning. Heavy freezing
spray. Snow. Waves 3 to 5 feet occasionally to 7 feet building to
5 to 8 feet occasionally to 10 feet, then subsiding to 4 to
7 feet occasionally to 9 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots late. 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 backing northwest by late
morning, then increasing to 15 to 25 knots by mid afternoon. A
slight chance of snow showers. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A slight chance of snow showers.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.SATURDAY...Northwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight. Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots veering northwest. A
chance of snow showers. Waves building to 2 to 4 feet, then
subsiding to calm to 2 feet.
.MONDAY...North winds 15 to 25 knots. A chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-112300-
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-
959 AM EST Thu Jan 11 2018

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH FRIDAY
MORNING...

.REST OF TODAY...North gales to 40 knots. Patchy fog late in the
morning. Heavy freezing spray. Snow. Waves 4 to 7 feet
occasionally to 9 feet building to 7 to 10 feet occasionally to
13 feet.
.TONIGHT...North gales to 40 knots diminishing to 20 to 30 knots
late. Heavy freezing spray. A chance of snow showers. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...North winds 15 to 25 knots backing northwest. A chance
of snow showers. Waves subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. A chance of snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.SATURDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight. A chance of snow showers. Waves calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. A chance of snow
showers. Waves building to 2 to 4 feet, then subsiding to calm to
2 feet.
.MONDAY...North winds 15 to 25 knots. A chance of snow showers,
then snow showers likely. Waves building to 3 to 6 feet
occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-112300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
959 AM EST Thu Jan 11 2018

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH FRIDAY
MORNING...

.REST OF TODAY...North gales to 40 knots. Areas of fog late in
the morning. Heavy freezing spray. Snow. Waves 4 to 7 feet
occasionally to 9 feet building to 8 to 11 feet occasionally to
14 feet.
.TONIGHT...North gales to 40 knots. Heavy freezing spray. Snow
showers in the evening. A chance of snow showers after midnight.
Waves building to 9 to 12 feet occasionally to 15 feet, then
subsiding to 6 to 9 feet occasionally to 11 feet.
.FRIDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots. Heavy freezing spray in the morning. A chance of snow
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. A chance of snow showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots. A chance of snow
showers. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. A chance of snow
showers. Waves building to 2 to 4 feet, then subsiding to calm to
2 feet.
.MONDAY...North winds 15 to 25 knots. A chance of snow showers,
then snow showers likely. Heavy freezing spray. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-112300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
959 AM EST Thu Jan 11 2018

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
FRIDAY MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 4 PM EST THIS
AFTERNOON THROUGH FRIDAY AFTERNOON...

.REST OF TODAY...Northwest winds 5 to 15 knots becoming north
gales to 35 knots. Patchy fog late in the morning. Freezing spray
in the afternoon. Rain changing to snow by early afternoon. Waves
calm to 2 feet building to 8 to 11 feet occasionally to 14 feet.
.TONIGHT...North gales to 40 knots. Heavy freezing spray. Snow
showers. Waves building to 10 to 14 feet occasionally to 18 feet,
then subsiding to 8 to 11 feet occasionally to 14 feet.
.FRIDAY...North winds 20 to 30 knots backing northwest. Heavy
freezing spray. Snow showers likely. Waves subsiding to 4 to
7 feet occasionally to 9 feet.
.FRIDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Snow showers likely. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Northwest winds 15 to 25 knots. Snow showers likely.
Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. A chance of snow showers. Waves subsiding to calm
to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. A chance of snow
showers. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.MONDAY...North winds 10 to 20 knots increasing to 15 to
25 knots. Snow showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-112300-
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-
959 AM EST Thu Jan 11 2018

...GALE WARNING IN EFFECT FROM 1 PM EST THIS AFTERNOON THROUGH
FRIDAY MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 4 PM EST THIS
AFTERNOON THROUGH FRIDAY AFTERNOON...

.REST OF TODAY...Southwest winds 15 to 25 knots becoming north
gales to 40 knots. Patchy fog. Freezing spray in the afternoon.
Snow, possibly mixed with rain. Waves calm to 2 feet building to
8 to 11 feet occasionally to 14 feet.
.TONIGHT...North gales to 45 knots. Heavy freezing spray. Snow
showers. Waves building to 10 to 14 feet occasionally to 18 feet,
then subsiding to 9 to 12 feet occasionally to 15 feet.
.FRIDAY...North gales to 40 knots becoming northwest gales to
35 knots by mid afternoon. Heavy freezing spray. Snow showers
likely. Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.FRIDAY NIGHT...Northwest gales to 35 knots becoming north 20 to
30 knots after midnight. Heavy freezing spray. Snow showers
likely. Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.SATURDAY...North winds 15 to 25 knots backing northwest in the
afternoon. Heavy freezing spray in the morning. Snow showers
likely. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. Snow showers likely. Waves subsiding to 1 to
3 feet.
.SUNDAY...Southwest winds 15 to 25 knots. A chance of snow
showers. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 1 to 3 feet.
.MONDAY...Southeast winds 15 to 25 knots backing northeast. Snow
showers likely. Freezing spray. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-112300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
959 AM EST Thu Jan 11 2018

...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 4 PM EST THIS
AFTERNOON THROUGH FRIDAY AFTERNOON...
...GALE WARNING IN EFFECT FROM 7 PM EST THIS EVENING THROUGH
FRIDAY MORNING...

.REST OF TODAY...South winds 10 to 20 knots becoming southwest
5 to 15 knots by late morning, then becoming north 15 to 25 knots
by mid afternoon. Patchy fog. Areas of drizzle and a chance of
rain late in the morning. Rain, possibly mixed with snow in the
afternoon. Waves calm to 2 feet building to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...North gales to 40 knots. Heavy freezing spray. Snow
showers likely. Waves building to 6 to 10 feet occasionally to
13 feet.
.FRIDAY...North gales to 35 knots diminishing to 20 to 30 knots.
Heavy freezing spray. A chance of snow showers. Waves subsiding
to 5 to 8 feet occasionally to 10 feet.
.FRIDAY NIGHT...Northwest winds 20 to 30 knots becoming north
15 to 25 knots after midnight. Heavy freezing spray. A chance of
snow showers. Waves subsiding to 4 to 7 feet occasionally to
9 feet.
.SATURDAY...North winds 10 to 20 knots. A chance of snow showers.
Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots backing west after
midnight. Snow showers likely. Waves subsiding to 1 to 3 feet.
.SUNDAY...Southwest winds 15 to 25 knots backing south. A chance
of snow showers. Waves subsiding to calm to 2 feet, then building
to 3 to 5 feet occasionally to 7 feet.
.MONDAY...Southeast winds 10 to 20 knots becoming east 15 to
25 knots. A chance of snow showers. Waves building to 2 to
4 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-112300-
MAFOR 1116/
Superior West...Gale Warning and Heavy Freezing Spray Warning in
effect...13857 11852 11842 11840 12830. Freezing spray, then heavy
freezing spray through the early overnight. Chance of snow
through the early overnight. Waves 5 to 9 feet this afternoon.
Waves 5 to 8 feet subsiding to 3 to 6 feet tonight. Waves 3 to 5
feet Friday morning.

Superior North Central...Gale Warning and Heavy Freezing Spray
Warning in effect...12857 12867 12857 12842. Freezing spray, then
heavy freezing spray. Chance of snow showers Friday morning. Waves
5 to 8 feet building to 7 to 10 feet this afternoon. Waves 7 to
11 feet tonight. Waves 5 to 8 feet Friday morning.

Superior South Central...Gale Warning and Heavy Freezing Spray
Warning in effect...11747 15857 11857. Patchy fog late this
morning. Freezing spray through early evening, then heavy freezing
spray. Waves 1 foot or less building to 8 to 11 feet this
afternoon. Waves 9 to 13 feet tonight. Waves 7 to 11 feet Friday
morning.

Superior East...Gale Warning and Heavy Freezing Spray Warning in
effect...11507 11737 14857 11847 11842. Patchy fog.
Areas of drizzle late this morning. Freezing spray through late
this evening then heavy freezing spray. Chance of snow showers
Friday morning. Waves 1 to 2 feet building to 3 to 5 feet this
afternoon. Waves 5 to 8 feet building to 7 to 10 feet tonight.
Waves 6 to 9 feet Friday 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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