Great Lakes Forecast
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FZUS63 KMQT 220857
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
357 AM 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...As 30.5 inch high pressure drifts from northern
Ontario into Quebec today, low pressure of 29.4 inches over
northwest Missouri will track northeast, reaching northern
Illinois by evening. This low will then cross Lower Michigan
Tuesday morning and reach 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 high pressure ridge moves to
the East Coast on Friday at a pressure of 30.6 inches, a low
pressure of 29.5 inches will track east, reaching northern Ontario
by Friday evening.

LSZ162-221700-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
357 AM EST Mon Jan 22 2018 /257 AM CST Mon Jan 22 2018/

...GALE WARNING IN EFFECT FROM 10 AM EST /9 AM CST/ THIS MORNING
THROUGH LATE TONIGHT...

.EARLY THIS MORNING...Northeast winds 20 to 30 knots. Patchy fog.
A slight chance of drizzle and freezing drizzle. Waves 6 to
9 feet occasionally to 11 feet.
.TODAY...Northeast gales to 35 knots. Patchy fog in the morning.
A slight chance of freezing drizzle. Waves building to 9 to
12 feet occasionally to 15 feet.
.TONIGHT...Northeast gales to 35 knots becoming north 20 to
30 knots late. Freezing spray. A chance of freezing rain in the
evening. A chance of snow and a slight chance of freezing
drizzle. Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...North winds 15 to 25 knots veering northeast by late
morning, then 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 becoming east
5 to 15 knots after midnight. A slight chance of snow showers
after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots becoming south less
than 10 knots in the afternoon. A 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 becoming southeast 10 to
20 knots. Waves building to 1 to 3 feet.
.FRIDAY...Southeast winds 10 to 20 knots becoming southwest 20 to
30 knots. A chance of rain showers. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-221700-
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-
357 AM EST Mon Jan 22 2018

...GALE WARNING IN EFFECT FROM 10 AM EST THIS MORNING THROUGH
LATE TONIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM THIS EVENING
THROUGH TUESDAY AFTERNOON...

.EARLY THIS MORNING...Northeast winds 15 to 25 knots. Patchy fog.
A slight chance of freezing drizzle and snow. Waves 6 to 9 feet
occasionally to 11 feet.
.TODAY...Northeast winds 20 to 30 knots increasing to gales to
40 knots. Patchy fog. Freezing spray in the afternoon. A chance
of drizzle and a slight chance of freezing drizzle. Waves
building to 9 to 12 feet occasionally to 15 feet.
.TONIGHT...Northeast gales to 40 knots becoming north gales to
35 knots late. Freezing spray becoming heavy freezing spray. A
chance of freezing rain in the evening. A chance of snow and
freezing drizzle. Waves 9 to 12 feet occasionally to 15 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. A slight chance of snow showers in the
morning. Heavy freezing spray. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY NIGHT...Northeast winds 15 to 25 knots diminishing to
5 to 15 knots after midnight. A slight chance of snow showers
after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots becoming south less
than 10 knots in the afternoon. 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 becoming southeast 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...South winds 15 to 25 knots becoming southwest 20 to
30 knots. A chance of rain showers, possibly mixed with snow.
Waves building to 3 to 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-221700-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
357 AM EST Mon Jan 22 2018

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

.EARLY THIS MORNING...Northeast winds 15 to 25 knots. Freezing
spray and patchy fog. A slight chance of freezing drizzle and
snow. Waves 4 to 7 feet occasionally to 9 feet.
.TODAY...Northeast winds 15 to 25 knots increasing to gales to
35 knots by mid afternoon. Patchy fog in the morning. Freezing
spray. A slight chance of snow in the morning. A slight chance of
freezing drizzle. Waves building to 7 to 10 feet occasionally to
13 feet.
.TONIGHT...Northeast gales to 35 knots. Freezing spray becoming
heavy freezing spray. A chance of freezing rain in the evening. A
chance of snow and freezing drizzle. Waves building to 9 to 12
feet occasionally to 15 feet.
.TUESDAY...North gales to 35 knots diminishing to 20 to 30 knots.
A slight chance of snow showers 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 after midnight. Freezing spray in the evening.
Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots becoming south less
than 10 knots in the afternoon. Waves subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...South winds 5 to 15 knots becoming southeast 15 to
25 knots. Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...Southeast winds 20 to 30 knots veering south. 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.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-221700-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
357 AM EST Mon Jan 22 2018

...GALE WARNING IN EFFECT FROM THIS AFTERNOON THROUGH TUESDAY
MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM LATE TONIGHT
THROUGH TUESDAY AFTERNOON...

.EARLY THIS MORNING...Northeast winds 15 to 25 knots. Patchy fog.
A slight chance of freezing drizzle. Waves 4 to 7 feet
occasionally to 9 feet.
.TODAY...East winds 20 to 30 knots becoming northeast gales to
35 knots by mid afternoon. Patchy fog in the morning. A chance of
freezing drizzle. Snow likely, possibly mixed with freezing rain
in the afternoon. Waves building to 6 to 9 feet occasionally to
11 feet.
.TONIGHT...Northeast gales to 35 knots. Freezing spray becoming
heavy freezing spray late. Snow, possibly mixed with freezing
rain. A chance of freezing drizzle after midnight. Waves building
to 8 to 11 feet occasionally to 14 feet.
.TUESDAY...North gales to 35 knots diminishing to 20 to 30 knots.
A slight chance of snow showers 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 10 to
20 knots after midnight. Freezing spray in the evening. Waves
subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering south in the
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots becoming southeast 15 to
25 knots. Waves building to 2 to 4 feet.
.FRIDAY...South winds 15 to 25 knots increasing to 20 to
30 knots. 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.

$$

LSZ266-221700-
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-
357 AM EST Mon Jan 22 2018

...GALE WARNING IN EFFECT FROM THIS AFTERNOON THROUGH TUESDAY
MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM LATE TONIGHT
THROUGH TUESDAY AFTERNOON...

.EARLY THIS MORNING...East winds 15 to 25 knots. Patchy fog. A
slight chance of drizzle and freezing drizzle. Waves 4 to 7 feet
occasionally to 9 feet.
.TODAY...East winds 20 to 30 knots becoming northeast gales to
35 knots by mid afternoon. Patchy fog in the morning. A slight
chance of snow in the morning. A slight chance of freezing
drizzle. Snow, possibly mixed with freezing rain in the
afternoon. Waves building to 6 to 9 feet occasionally to 11 feet.
.TONIGHT...Northeast gales to 40 knots. Freezing spray becoming
heavy freezing spray late. Snow, possibly mixed with freezing
rain. Waves building to 8 to 11 feet occasionally to 14 feet.
.TUESDAY...Northeast gales to 35 knots backing north. A slight
chance of snow showers in the morning. Heavy freezing spray.
Waves building to 9 to 12 feet occasionally to 15 feet, then
subsiding to 7 to 10 feet occasionally to 13 feet.
.TUESDAY NIGHT...North winds 20 to 30 knots becoming northeast
10 to 20 knots after midnight. Freezing spray in the evening.
Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering east in the
afternoon. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.THURSDAY...South winds 10 to 20 knots becoming southeast 15 to
25 knots. Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...Southeast winds 20 to 30 knots veering south. 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.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-221700-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
357 AM EST Mon Jan 22 2018

...GALE WARNING IN EFFECT FROM THIS AFTERNOON THROUGH TUESDAY
MORNING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM LATE TONIGHT
THROUGH TUESDAY AFTERNOON...

.EARLY THIS MORNING...East winds 15 to 25 knots. Patchy fog.
Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...East winds 15 to 25 knots becoming northeast 20 to
30 knots with gale force gusts to 35 knots by mid afternoon. A
slight chance of freezing drizzle. Snow, possibly mixed with
freezing rain in the afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TONIGHT...Northeast gales to 35 knots. Freezing spray becoming
heavy freezing spray late. Snow. Waves building to 7 to 10 feet
occasionally to 13 feet.
.TUESDAY...Northeast gales to 35 knots backing north. A chance of
snow showers in the morning. Heavy freezing spray. Waves building
to 8 to 11 feet occasionally to 14 feet, then subsiding to 5 to
8 feet occasionally to 10 feet.
.TUESDAY NIGHT...North winds 20 to 30 knots becoming northeast
10 to 20 knots after midnight. Freezing spray in the evening.
Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots becoming east 5 to
15 knots 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 becoming southeast 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Southeast winds 20 to 30 knots becoming south gales to
35 knots. 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.

$$

LSZ261-221700-
MAFOR 2210/
Superior West...Gale Warning in effect...12140 12150 12151 11150
11140. Patchy fog this morning. Freezing spray through early
evening. Waves 6 to 11 feet today. Waves 8 to 12 feet tonight.

Superior North Central...Gale Warning in effect...11130 12131
11141 14150. Freezing spray with patchy fog. Chance of light
freezing drizzle and light freezing rain tonight. Chance of snow
late tonight. Waves 5 to 8 feet today building to 9 to 12 feet
tonight.

Superior South Central...Gale Warning in effect...11130 12230
11140 11147 12157 11147. Patchy fog this morning. Chance of light
freezing rain and freezing drizzle, beginning early this
afternoon. Freezing spray late tonight. Waves 5 to 9 feet
today. Waves 8 to 11 feet tonight.

Superior East...Gale Warning in effect...13230 11140 11147 13157.
Patchy fog this morning. Chance of light freezing rain early this
afternoon. Freezing spray tonight. Waves 5 to 8 feet today. Waves
7 to 11 feet tonight.

$$

Rolfson

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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