Great Lakes Forecast
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FZUS63 KMQT 230256
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
956 PM EST Mon Jan 22 2018



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...Low pressure of 29.4 inches over southern Lake
Michigan will track northeast, reaching Lake Huron Tuesday
morning and the Canadian Maritimes on Wednesday. In its wake, a
high pressure ridge of 30.4 inches will shift southeast, arriving
over the Upper Great Lakes Wednesday and the Lower Great Lakes on
Thursday. As the ridge moves to the East Coast on Friday at 30.6
inches, a low pressure of 29.5 inches will track east, reaching
northern Ontario by Friday evening. A ridge of 30.5 inches will
begin to push southeastward out of northern Saskatchewan by
Saturday evening.

LSZ162-231100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
956 PM EST Mon Jan 22 2018 /856 PM CST Mon Jan 22 2018/

.REST OF TONIGHT...Northeast winds 20 to 30 knots backing north
late. Freezing spray. A slight chance of freezing drizzle late in
the evening. A slight chance of snow. Waves 9 to 12 feet
occasionally to 15 feet subsiding to 6 to 9 feet occasionally to
11 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Freezing spray in the morning. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots by midnight, then veering east late. A slight
chance of snow showers after midnight. Waves subsiding to calm to
2 feet.
.WEDNESDAY...South winds 5 to 15 knots diminishing to less than
10 knots in the afternoon. A slight chance of snow showers. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves building to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots becoming west 20 to
30 knots. A chance of rain showers. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SATURDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots. A chance of snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-231100-
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-
956 PM EST Mon Jan 22 2018

...GALE WARNING IN EFFECT THROUGH TUESDAY MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH TUESDAY
AFTERNOON...

.REST OF TONIGHT...Northeast gales to 35 knots backing north
late. Heavy freezing spray. A chance of freezing drizzle late in
the evening. A chance of snow. Waves 10 to 14 feet occasionally to
18 feet subsiding to 9 to 12 feet occasionally to 15 feet.
.TUESDAY...North gales to 35 knots diminishing to 15 to 25 knots
in the afternoon. A slight chance of snow in the morning. Heavy
freezing spray. Waves subsiding to 4 to 7 feet occasionally to 9
feet.
.TUESDAY NIGHT...North winds 15 to 25 knots becoming northeast
10 to 20 knots by midnight, then diminishing to 5 to 15 knots
late. A slight chance of snow showers. Waves subsiding to 1 to
3 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots becoming south less
than 10 knots in the afternoon. A slight chance of snow showers.
Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots increasing to
15 to 25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...South winds 15 to 25 knots becoming southwest 20 to
30 knots. Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots. A chance of rain showers. A chance of snow showers.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-231100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
956 PM EST Mon Jan 22 2018

...GALE WARNING IN EFFECT THROUGH TUESDAY MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH TUESDAY
AFTERNOON...

.REST OF TONIGHT...Northeast gales to 35 knots. Heavy freezing
spray. A chance of freezing drizzle late in the evening. A chance
of snow. Waves 8 to 12 feet occasionally to 15 feet.
.TUESDAY...North gales to 35 knots diminishing to 20 to 30 knots
in the afternoon. A slight chance of snow in the morning. Heavy
freezing spray. Waves subsiding to 6 to 9 feet occasionally to 11
feet.
.TUESDAY NIGHT...North winds 15 to 25 knots becoming northeast
10 to 20 knots by midnight, then diminishing to 5 to 15 knots
late. Freezing spray in the evening. A slight chance of snow
showers. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...East winds 5 to 15 knots becoming south less than
10 knots in the afternoon. A slight chance of snow showers in the
morning. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing south in the
afternoon. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots increasing to
20 to 30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...South winds 20 to 30 knots veering southwest. A chance
of rain showers, possibly mixed with snow. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...West gales to 35 knots becoming northwest 20 to
30 knots. A chance of rain showers. A chance of snow showers.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-231100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
956 PM EST Mon Jan 22 2018

...GALE WARNING IN EFFECT THROUGH TUESDAY MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 4 AM EST TUESDAY
THROUGH TUESDAY AFTERNOON...

.REST OF TONIGHT...Northeast gales to 35 knots backing north
late. Freezing spray, becoming heavy late. Snow. Waves 8 to 12
feet occasionally to 15 feet.
.TUESDAY...North gales to 35 knots diminishing to 20 to 30 knots
in the afternoon. A slight chance of snow in the morning. Heavy
freezing spray. Waves subsiding to 6 to 9 feet occasionally to 11
feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots. Freezing spray in the evening. A slight chance of snow
showers after midnight. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering south in the
afternoon. A slight chance of snow showers in the morning. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...South winds 20 to 30 knots veering southwest. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.SATURDAY...West winds 20 to 30 knots veering northwest. A chance
of rain showers. 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.

$$

LSZ266-231100-
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-
956 PM EST Mon Jan 22 2018

...GALE WARNING IN EFFECT THROUGH TUESDAY MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 4 AM EST TUESDAY
THROUGH TUESDAY AFTERNOON...

.REST OF TONIGHT...Northeast gales to 40 knots. Freezing spray,
becoming heavy late. A slight chance of freezing drizzle late in
the evening. Snow. Waves 9 to 12 feet occasionally to 15 feet.
.TUESDAY...North gales to 35 knots diminishing to 20 to 30 knots
in the afternoon. A slight chance of snow in the morning.
Heavy freezing spray. Waves subsiding to 7 to 10 feet
occasionally to 13 feet.
.TUESDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots by midnight, then becoming northeast 10 to 20 knots
late. Freezing spray in the evening. Waves subsiding to 2 to
4 feet.
.WEDNESDAY...East winds 5 to 15 knots veering south in the
afternoon. A slight chance of snow showers in the morning. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots in the afternoon. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots becoming southeast
20 to 30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...South gales to 35 knots diminishing to 20 to 30 knots.
Waves building to 6 to 9 feet occasionally to 11 feet, then
subsiding to 4 to 7 feet occasionally to 9 feet.
.SATURDAY...West gales to 35 knots becoming northwest 20 to
30 knots. A chance of rain showers. A chance of snow showers.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-231100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
956 PM EST Mon Jan 22 2018

...GALE WARNING IN EFFECT THROUGH TUESDAY MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM 4 AM EST TUESDAY
THROUGH TUESDAY AFTERNOON...

.REST OF TONIGHT...Northeast gales to 35 knots. Freezing spray,
becoming heavy late. Snow. Waves 7 to 10 feet occasionally to 13
feet.
.TUESDAY...Northeast gales to 35 knots becoming north 20 to 30
knots with a few gale force gusts to 35 knots in the afternoon. A
chance of snow in the morning. Heavy freezing spray. Waves
building to 8 to 11 feet occasionally to 14 feet, then subsiding
to 6 to 9 feet occasionally to 11 feet.
.TUESDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots by midnight, then becoming northeast 10 to 20 knots
late. Freezing spray in the evening. A slight chance of snow
showers in the evening. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...East winds 5 to 15 knots veering southeast in the
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...South winds 20 to 30 knots increasing to gales to
35 knots. A chance of rain showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...West gales to 35 knots becoming northwest 20 to
30 knots. A chance of rain showers. A chance of snow showers.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-231100-
MAFOR 2304/
Superior West...Gale Warning in effect...12151 12141 12131 11830
11120. Chance of snow overnight. Waves 8 to 12 feet overnight
subsiding to 5 to 8 feet Tuesday. Waves subsiding to 2 to 4 feet
Tuesday evening.

Superior North Central...Gale and Heavy Freezing Spray Warnings
in effect...12151 11152 12852 11842 11841 11831. Chance of
freezing drizzle tonight. Chance of snow through mid Tuesday
morning. Waves 7 to 12 feet overnight and Tuesday subsiding to 5
to 8 feet Tuesday evening.

Superior South Central...Gale and Heavy Freezing Spray Warnings
in effect...11147 11157 11857 13852 11842 11841. Freezing spray
overnight. Chance of snow Tuesday morning. Waves 8 to 12 feet
overnight and Tuesday subsiding to 5 to 9 feet Tuesday evening.

Superior East...Gale and Heavy Freezing Spray Warnings in
effect...13157 11152 11852 11851 12841. Freezing spray overnight.
Chance of snow Tuesday morning. Waves 6 to 11 feet overnight and
Tuesday subsiding to 5 to 8 feet Tuesday evening.

$$

Kluber

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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