Great Lakes Forecast
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FZUS63 KMQT 192055
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
355 PM EST Fri Jan 19 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...A 29.3 inch low pressure system across western Ontario
this afternoon will track eastward to central Quebec by midday
Saturday. Early Sunday morning, a 29.6 inch low over the Colorado
Rockies will eject into the central Plains and deepen to 29.4 inches
as it moves across the western Great Lakes late Monday. The low will
reach Quebec late on Tuesday with high pressure averaging 30.3
inches stretching from Texas and the lower Mississippi Valley up
through Manitoba and Ontario through Wednesday.

LSZ162-200500-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
355 PM EST Fri Jan 19 2018 /255 PM CST Fri Jan 19 2018/

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots by midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots by midnight, then veering north late. Waves calm to
2 feet.
.SUNDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. A chance of rain in the evening. A
chance of snow. Waves building to 4 to 7 feet occasionally to
9 feet.
.MONDAY...Northeast gales to 40 knots. Freezing spray in the
morning. Snow. Waves building to 8 to 11 feet occasionally to
14 feet.
.MONDAY NIGHT...Northeast gales to 35 knots backing north after
midnight. Freezing spray. Snow likely in the evening. A chance of
snow after midnight. Waves subsiding to 4 to 7 feet occasionally
to 9 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south. Scattered
snow showers. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-200500-
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-
355 PM EST Fri Jan 19 2018

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to 3 to 5 feet occasionally to 7
feet, then building to 4 to 7 feet occasionally to 9 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots diminishing to
less than 10 knots by midnight, then veering north late. Waves
calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. A chance of snow, possibly mixed
with freezing rain. Waves building to 4 to 7 feet occasionally to
9 feet.
.MONDAY...Northeast gales to 40 knots. Freezing spray. Snow.
Waves building to 8 to 11 feet occasionally to 14 feet.
.MONDAY NIGHT...Northeast gales to 40 knots becoming north gales
to 35 knots after midnight. Freezing spray. Snow likely. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 10 to
20 knots. Freezing spray. Scattered snow showers. Waves subsiding
to calm to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south. Scattered
snow showers. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-200500-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
355 PM EST Fri Jan 19 2018

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Waves 3 to 6
feet occasionally to 8 feet.
.TONIGHT...West winds 15 to 25 knots. Waves building to 4 to 7
feet occasionally to 9 feet.
.SATURDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots by late morning, then backing west by mid afternoon.
Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots becoming southwest
less than 10 knots by midnight, then becoming west 5 to 15 knots
late. A slight chance of rain. A slight chance of freezing rain
and snow after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A slight chance of freezing rain. A
slight chance of snow in the afternoon. Waves building to 3 to
5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots becoming east
15 to 25 knots after midnight. A chance of snow, possibly mixed
with freezing rain. Freezing spray after midnight. Waves 3 to
5 feet occasionally to 7 feet.
.MONDAY...East winds 15 to 25 knots becoming northeast gales to
35 knots in the afternoon. Freezing spray. A chance of snow in
the morning. 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 6 to 10 feet
occasionally to 13 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. Heavy freezing spray. Scattered snow showers. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south. Scattered
snow showers. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-200500-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
355 PM EST Fri Jan 19 2018

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...West winds 10 to 20 knots increasing to 15 to 25 knots
by midnight. Waves building to 1 to 3 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves building to 2 to 4 feet, then
subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots veering west
late. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots. A chance of snow.
Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...East winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. Snow. Waves building to 7 to 10 feet
occasionally to 13 feet.
.MONDAY NIGHT...Northeast gales to 35 knots backing north after
midnight. Snow. Freezing spray after midnight. 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 becoming northwest 15 to
25 knots. Heavy freezing spray. Snow showers, then scattered snow
showers. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing west.
Scattered snow showers. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-200500-
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-
355 PM EST Fri Jan 19 2018

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west by
midnight, then increasing to 20 to 30 knots late. Sprinkles, a
slight chance of drizzle and flurries in the evening. Waves
subsiding to 3 to 5 feet occasionally to 7 feet, then building to
6 to 9 feet occasionally to 11 feet.
.SATURDAY...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing southwest by
midnight. A slight chance of freezing rain after midnight. Waves
subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. A slight chance of freezing rain in the
afternoon. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...East winds 15 to 25 knots. A chance of snow,
possibly mixed with freezing rain. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...East winds 20 to 30 knots increasing to gales to
40 knots in the afternoon. Freezing spray. Snow. Waves building
to 7 to 10 feet occasionally to 13 feet.
.MONDAY NIGHT...Northeast gales to 35 knots. 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 gales to 35 knots diminishing to 20 to 30 knots.
Freezing spray. Snow showers. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...North winds 10 to 20 knots. Scattered snow showers.
Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-200500-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
355 PM EST Fri Jan 19 2018

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TONIGHT...Southwest winds 15 to 25 knots becoming west 20 to
30 knots by midnight. Waves subsiding to 2 to 4 feet, then
building to 6 to 9 feet occasionally to 11 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 5 to
15 knots. Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots becoming southwest
10 to 20 knots by midnight, then becoming south 5 to 15 knots
late. A slight chance of freezing rain after midnight. Waves
subsiding to calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of snow. Waves building to 3 to
5 feet occasionally to 7 feet.
.MONDAY...East winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. Freezing spray in the morning. Patchy
blowing snow. Snow. Waves building to 5 to 8 feet occasionally to
10 feet.
.MONDAY NIGHT...East gales to 35 knots backing northeast after
midnight. Patchy blowing snow in the evening. Freezing spray.
Snow. Waves building to 6 to 9 feet occasionally to 11 feet, then
subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. Patchy blowing snow. Freezing spray. Numerous snow
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet,
then building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...North winds 10 to 20 knots. Scattered snow showers.
Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-200500-
MAFOR 1922/
Superior West 11530 13630 13620 11520. Waves 3 to 5 feet tonight.
Waves 2 to 4 feet subsiding to 1 to 3 feet Saturday.

Superior North Central 11530 12640 11630 11730 11720 11710 11610.
Waves 3 to 6 feet building to 4 to 7 feet tonight. Waves 3 to 6
feet subsiding to 1 to 3 feet Saturday.

Superior South Central 11520 11530 11630 11640 11630 12720 11710.
Waves 1 to 3 feet building to 3 to 5 feet tonight. Waves 3 to 5
feet subsiding to 1 to 3 feet Saturday.

Superior East 12530 11630 11640 11740 11730 11720 11710. Waves 3
to 6 feet building to 5 to 9 feet tonight. Waves 6 to 9 feet
subsiding to 3 to 5 feet Saturday.

$$

JLA

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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