Great Lakes Forecast
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FZUS63 KMQT 210858
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
358 AM EST Sun Jan 21 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 builds into northern
Ontario this afternoon, low pressure of 29.5 inches will organize
near the Oklahoma Panhandle. This low will then lift northeast,
tracking across northern Lower Michigan Tuesday morning. As the
low reaches the Canadian Maritimes on Wednesday, high pressure of
30.4 inches will shift across the Upper Great Lakes. Late
Thursday, low pressure of 29.6 inches will begin to organize near
southern Alberta.

LSZ162-211700-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
358 AM EST Sun Jan 21 2018 /258 AM CST Sun Jan 21 2018/

...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH TUESDAY
MORNING...

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A slight chance of rain in the
afternoon. Waves building to 2 to 4 feet.
.TONIGHT...Northeast winds 15 to 25 knots increasing to 20 to
30 knots by midnight, then diminishing to 15 to 25 knots late. A
slight chance of freezing rain. A slight chance of snow after
midnight. Freezing spray after midnight. Waves building to 6 to
9 feet occasionally to 11 feet.
.MONDAY...Northeast winds 20 to 30 knots increasing to gales to
35 knots. Freezing spray. A chance of freezing drizzle and a
slight chance of snow. Waves building to 9 to 12 feet
occasionally to 15 feet.
.MONDAY NIGHT...Northeast gales to 35 knots becoming north 20 to
30 knots after midnight. Freezing spray. A chance of snow. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast. Waves
calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-211700-
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-
358 AM EST Sun Jan 21 2018

...GALE WATCH IN EFFECT FROM MONDAY MORNING THROUGH TUESDAY
MORNING...

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A slight chance of freezing rain. A
slight chance of rain in the afternoon. Waves building to 3 to
5 feet occasionally to 7 feet.
.TONIGHT...Northeast winds 15 to 25 knots. Freezing spray. A
slight chance of freezing rain. A slight chance of snow after
midnight. Waves building to 6 to 9 feet occasionally to 11 feet.
.MONDAY...Northeast winds 20 to 30 knots increasing to gales to
40 knots. Freezing spray. A chance of freezing drizzle and a
slight chance of snow. Waves building to 9 to 12 feet
occasionally to 15 feet.
.MONDAY NIGHT...Northeast gales to 40 knots becoming north gales
to 35 knots after midnight. Heavy freezing spray. A chance of
snow. Waves building to 10 to 14 feet occasionally to 18 feet,
then subsiding to 7 to 10 feet occasionally to 13 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Heavy freezing spray. Waves subsiding
to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering southwest.
Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-211700-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
358 AM EST Sun Jan 21 2018

...GALE WATCH IN EFFECT MONDAY EVENING THROUGH TUESDAY MORNING...

.EARLY THIS MORNING...East winds 5 to 15 knots. A slight chance
of freezing rain. Waves calm to 2 feet.
.TODAY...East winds 5 to 15 knots increasing to 10 to 20 knots by
late morning, then backing northeast by mid afternoon. A slight
chance of freezing rain. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots late. Freezing spray. A slight chance of freezing rain
and snow. Waves building to 4 to 8 feet occasionally to 10 feet.
.MONDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Freezing spray. A chance of snow and
freezing drizzle. Waves building to 6 to 9 feet occasionally to
11 feet.
.MONDAY NIGHT...Northeast gales to 35 knots becoming north 20 to
30 knots after midnight. Heavy freezing spray. A chance of snow.
Waves building to 7 to 11 feet occasionally to 14 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. 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 after midnight. Freezing spray in the evening.
Waves subsiding to 2 to 4 feet.
.WEDNESDAY...East winds 5 to 15 knots veering south. A chance of
snow showers. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots increasing to 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-211700-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
358 AM EST Sun Jan 21 2018

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
MORNING...

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...North winds less than 10 knots backing west by late
morning, then becoming east 5 to 15 knots by mid afternoon.
Patchy dense fog in the morning. A slight chance of rain and
freezing rain in the afternoon. Waves calm to 2 feet.
.TONIGHT...Northeast winds 10 to 20 knots increasing to 15 to
25 knots by midnight, then veering east late. A slight chance of
rain in the evening. A slight chance of freezing rain. Waves
building to 4 to 7 feet occasionally to 9 feet.
.MONDAY...East winds 15 to 25 knots increasing to 20 to 30 knots
by late morning, then becoming northeast gales to 35 knots by mid
afternoon. Freezing spray. A slight chance of snow in the
morning. A chance of freezing drizzle. Snow in the afternoon.
Waves building to 6 to 9 feet occasionally to 11 feet.
.MONDAY NIGHT...Northeast gales to 35 knots backing north after
midnight. Freezing spray. Snow. Waves building to 8 to 11 feet
occasionally to 14 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.
.TUESDAY...North winds 20 to 30 knots. Heavy freezing spray. Snow
likely in the morning. A chance of snow in the afternoon. Waves
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 5 to 8 feet occasionally to 10 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Heavy freezing spray in the evening. A
chance of snow showers. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...East winds 5 to 15 knots veering south. A chance of
snow showers. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots. Waves building to 2 to
4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-211700-
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-
358 AM EST Sun Jan 21 2018

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
AFTERNOON...

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...East winds 5 to 15 knots increasing to 10 to 20 knots by
mid afternoon. A slight chance of freezing rain. Waves building
to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...East winds 15 to 25 knots backing northeast by
midnight, then veering east late. A slight chance of freezing
rain in the evening. Freezing spray after midnight. Waves
building to 4 to 7 feet occasionally to 9 feet.
.MONDAY...East winds 15 to 25 knots increasing to 20 to 30 knots.
Freezing spray. A chance of snow in the morning. A chance of
freezing drizzle. Snow likely in the afternoon. Waves building to
6 to 9 feet occasionally to 11 feet.
.MONDAY NIGHT...Northeast gales to 35 knots. Freezing spray.
Snow. Waves building to 7 to 11 feet occasionally to 14 feet.
.TUESDAY...North gales to 40 knots. Freezing spray. Snow likely
in the morning. A chance of snow in the afternoon. Waves
subsiding to 6 to 9 feet occasionally to 11 feet.
.TUESDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Freezing spray in the evening. A chance
of snow showers. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...East winds 5 to 15 knots veering south. A chance of
snow showers. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-211700-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
358 AM EST Sun Jan 21 2018

...GALE WATCH IN EFFECT FROM MONDAY EVENING THROUGH TUESDAY
AFTERNOON...

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...East winds 5 to 15 knots backing northeast by mid
afternoon. Waves building to 1 to 3 feet.
.TONIGHT...Northeast winds 10 to 20 knots veering east late.
Freezing spray after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...East winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. A chance of snow in the morning. A slight
chance of freezing drizzle. Snow in the afternoon. Freezing spray
in the afternoon. Waves building to 4 to 7 feet occasionally to
9 feet.
.MONDAY NIGHT...Northeast gales to 35 knots. Freezing spray.
Snow. Waves building to 5 to 9 feet occasionally to 11 feet.
.TUESDAY...Northeast gales to 35 knots becoming north 20 to
30 knots in the afternoon. Heavy freezing spray. A chance of
snow. Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots. Freezing spray in
the evening. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.WEDNESDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-211700-
MAFOR 2110/
Superior West 13100 11110 11130 11140 12141. Waves 1 foot or less
building to 1 to 3 feet today. Waves 3 to 5 feet building to 5 to
9 feet tonight.

Superior North Central 12200 11220 11120 11131 13130. Freezing
spray late tonight. Waves 1 to 2 feet building to 3 to 5 feet
today. Waves 4 to 7 feet tonight.

Superior South Central 12800 11100 19104 11100 11110 12120 11130.
Patchy fog late this morning today. Waves 1 foot or less today.
Waves 1 to 3 feet building to 4 to 7 feet tonight.

Superior East 12200 12210 11120 11130 11131 11231. Freezing spray
overnight. Waves 1 to 3 feet today. Waves 3 to 5 feet building to
4 to 7 feet tonight.

$$

Voss

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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