Great Lakes Forecast
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FZUS63 KMQT 122022
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
422 PM EDT Thu Apr 12 2018

For waters beyond 5 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...Low pressure of 29.5 inches over Lake Huron will move
quickly into Quebec tonight as a weak ridge of 30.0 inches move into
the northern Great Lakes. A 29.3 inch low will track across the
central Plains through Friday. This low will weaken slightly to
29.5 inches as it slowly rotates across the Great Lakes region
through the upcoming weekend and into early next week.

LSZ162-130430-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
422 PM EDT Thu Apr 12 2018 /322 PM CDT Thu Apr 12 2018/

...GALE WATCH IN EFFECT FROM FRIDAY EVENING THROUGH LATE SATURDAY
NIGHT...

.LATE THIS AFTERNOON...South winds less than 10 knots. Waves calm
to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight, then increasing to 15 to 25 knots late. Waves building
to 2 to 4 feet.
.FRIDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then veering east late. A slight
chance of snow. Waves building to 5 to 8 feet occasionally to
10 feet.
.FRIDAY NIGHT...Northeast gales to 40 knots. A slight chance of
snow. Freezing spray after midnight. Waves building to 10 to
14 feet occasionally to 18 feet.
.SATURDAY...Northeast gales to 40 knots. Freezing spray. A slight
chance of snow by mid afternoon. Waves subsiding to 9 to 12 feet
occasionally to 15 feet.
.SATURDAY NIGHT...East gales to 40 knots diminishing to 20 to
30 knots after midnight. A chance of snow. Freezing spray after
midnight. Waves subsiding to 7 to 10 feet occasionally to
13 feet.
.SUNDAY...Northeast winds 20 to 30 knots. Freezing spray through
early afternoon. A chance of snow. Waves 7 to 10 feet
occasionally to 13 feet.
.SUNDAY NIGHT...Northeast winds 20 to 30 knots becoming north
10 to 20 knots after midnight. A chance of snow. Waves subsiding
to 3 to 6 feet occasionally to 8 feet.
.MONDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to 1 to 3 feet.
.TUESDAY...East winds 5 to 15 knots increasing to 10 to 20 knots.
Waves 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-130430-
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-
422 PM EDT Thu Apr 12 2018

...GALE WATCH IN EFFECT FROM FRIDAY EVENING THROUGH LATE SATURDAY
NIGHT...

.LATE THIS AFTERNOON...Northeast winds less than 10 knots. Waves
calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots increasing to 10 to
20 knots late. Waves building to 2 to 4 feet.
.FRIDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. A slight chance of snow. Waves
building to 5 to 8 feet occasionally to 10 feet.
.FRIDAY NIGHT...Northeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. A slight chance of snow.
Freezing spray after midnight. Waves building to 10 to 14 feet
occasionally to 18 feet.
.SATURDAY...Northeast gales to 40 knots. Freezing spray. A slight
chance of snow by mid afternoon. Waves subsiding to 9 to 12 feet
occasionally to 15 feet.
.SATURDAY NIGHT...East gales to 40 knots diminishing to 20 to
30 knots after midnight. A chance of snow. Freezing spray after
midnight. Waves subsiding to 7 to 10 feet occasionally to
13 feet.
.SUNDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Freezing spray through early
afternoon. A chance of snow. Waves 7 to 10 feet occasionally to
13 feet.
.SUNDAY NIGHT...Northeast winds 20 to 30 knots becoming north
15 to 25 knots after midnight. A chance of snow. Freezing spray
after midnight. Waves subsiding to 4 to 7 feet occasionally to
9 feet.
.MONDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Freezing spray. Waves subsiding to 1 to 3 feet.
.TUESDAY...North winds 5 to 15 knots becoming east 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-130430-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
422 PM EDT Thu Apr 12 2018

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...North winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then veering northeast late. Waves building to
1 to 3 feet.
.FRIDAY...Northeast winds 15 to 25 knots becoming north 20 to
30 knots late. Waves building to 3 to 5 feet occasionally to
7 feet.
.FRIDAY NIGHT...Northeast winds 20 to 30 knots. A few gale force
gusts to 35 knots. Freezing spray after midnight. Waves building
to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...Northeast winds 20 to 30 knots. A few gale force gusts to
35 knots. Heavy freezing spray. Waves building to 5 to 9 feet
occasionally to 11 feet.
.SATURDAY NIGHT...East winds 20 to 30 knots. A few gale force
gusts to 35 knots. Freezing spray after midnight. Waves 5 to 8
feet occasionally to 10 feet.
.SUNDAY...Northeast winds 20 to 30 knots. A few gale force gusts
to 35 knots late in the day. Freezing spray through early
afternoon. A chance of snow. Waves 5 to 8 feet occasionally to 10
feet.
.SUNDAY NIGHT...Northeast winds backing north after midnight 20
to 30 knots. A few gale force gusts to 35 knots early. Freezing
spray. A chance of snow. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.MONDAY...North winds 20 to 30 knots. Freezing spray. A chance of
snow. Waves subsiding to 2 to 4 feet.
.TUESDAY...North winds 10 to 20 knots veering east. Waves
subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-130430-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
422 PM EDT Thu Apr 12 2018

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...North winds 5 to 15 knots becoming northeast 10 to
20 knots late. Waves building to 2 to 4 feet.
.FRIDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then becoming north 20 to 30 knots
late. A slight chance of snow. Waves building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...Northeast winds 20 to 30 knots. A slight chance
of snow. Waves building to 2 to 4 feet. Waves building 5 to 8
feet occasionally to 10 feet.
.SATURDAY...East winds 20 to 30 knots. A few gale force gusts to
35 knots. A slight chance of snow by mid afternoon. Waves building to
7 to 10 feet occasionally to 13 feet.
.SATURDAY NIGHT...East winds 20 to 30 knots. A few gale force
gusts to 35 knots. A chance of snow. Waves 7 to 10 feet
occasionally to 13 feet.
.SUNDAY...East winds becoming northeast 20 to 30 knots. A few
gale force gusts to 35 knots during the afternoon. A chance of
snow through early afternoon, then snow likely by mid afternoon.
Waves 7 to 10 feet occasionally to 13 feet.
.SUNDAY NIGHT...Northeast winds becoming north 20 to 30 knots. A
few gale force gusts to 35 knots early in the evening. Snow
likely through midnight, then a chance of snow after midnight.
Waves 7 to 10 feet occasionally to 13 feet.
.MONDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of snow. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...Northwest winds 10 to 20 knots veering east. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-130430-
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-
422 PM EDT Thu Apr 12 2018

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering north after
midnight, then becoming northeast 10 to 20 knots late. Waves
building 2 to 4 feet.
.FRIDAY...Northeast winds 15 to 25 knots increasing, becoming
north 20 to 30 knots late. A chance of snow. Waves 2 to 4 feet.
.FRIDAY NIGHT...Northeast winds 20 to 30 knots. A few gale force
gusts to 35 knots after midnight. A slight chance of snow. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...Northeast gales to 35 knots. A slight chance of snow
by mid afternoon. Waves building 5 to 8 feet occasionally to 10
feet.
.SATURDAY NIGHT...East gales to 35 knots. A chance of snow. Waves
building 7 to 10 feet occasionally to 13 feet.
.SUNDAY...East gales to 35 knots backing northeast by mid
afternoon. A chance of snow through early afternoon, then snow
likely by mid afternoon. Waves 7 to 10 feet occasionally to 13
feet.
.SUNDAY NIGHT...Northeast gales to 35 knots backing north after
midnight. Snow likely through midnight, then a chance of snow
after midnight. Waves 7 to 10 feet occasionally to 13 feet.
.MONDAY...North gales to 35 knots diminishing to 20 to 30 knots.
A chance of snow. Waves 7 to 10 feet occasionally to 13 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to 5 to 8 feet occasionally to 10 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-130430-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
422 PM EDT Thu Apr 12 2018

.LATE THIS AFTERNOON...North winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering northeast late.
Waves calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots becoming north 15 to
25 knots late. A chance of snow by mid afternoon. Waves building
to 2 to 4 feet.
.FRIDAY NIGHT...North winds 20 to 30 knots veering northeast
after midnight. A few gale force gusts to 35 knots late. A slight
chance of snow. Waves building to 3 to 5 feet occasionally to 7
feet.
.SATURDAY...Northeast winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. A slight chance of snow by mid
afternoon. Waves 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...East gales to 35 knots diminishing to 20 to
30 knots after midnight. A chance of snow. Waves 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...East winds 20 to 30 knots becoming northeast gales to
35 knots by mid afternoon. A chance of snow through early
afternoon, then snow likely by mid afternoon. Waves 3 to 5 feet
occasionally to 7 feet.
.SUNDAY NIGHT...Northeast gales to 35 knots diminishing to 20 to
30 knots after midnight. Snow likely. Waves building 5 to 8 feet
occasionally to 10 feet.
.MONDAY...North winds 20 to 30 knots. A chance of snow. Waves 5
to 8 feet occasionally to 10 feet.
.TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of snow. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-130430-
MAFOR 1221/

Superior West 11300 12200 11120 11130 13140. Waves 2 feet or less
tonight. Waves 3 to 6 feet Friday.

Superior North Central 12700 11810 11820 13120 11830. Waves 2
feet or less tonight. Waves to 2 to 4 feet Friday.


Superior South Central 13800 11810 12110 11120 11130. Chance of
snow early Friday afternoon. Waves 1 foot or less.

Superior East 13700 11810 11120 11110 12120. Waves 2 feet or
less.

$$

Ritzman

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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