Great Lakes Forecast
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FZUS63 KMQT 200245
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
945 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 just south of James
Bay this evening 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 Tuesday with high pressure averaging
30.3 inches stretching from the lower Mississippi Valley to
Manitoba and Ontario through Wednesday.

LSZ162-201045-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
945 PM EST Fri Jan 19 2018 /845 PM CST Fri Jan 19 2018/

.REST OF TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves 3 to 5 feet occasionally to 7 feet
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.

$$

LSZ263-201045-
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-
945 PM EST Fri Jan 19 2018

.REST OF TONIGHT...West winds 20 to 30 knots diminishing to 10 to
20 knots late. Waves 4 to 7 feet occasionally to 9 feet subsiding
to 3 to 5 feet occasionally to 7 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.

$$

LSZ264-201045-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
945 PM EST Fri Jan 19 2018

.REST OF TONIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves 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.

$$

LSZ265-201045-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
945 PM EST Fri Jan 19 2018

.REST OF TONIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots by midnight. Waves calm to 2 feet building to 3 to 5
feet occasionally to 7 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves 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.

$$

LSZ266-201045-
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-
945 PM EST Fri Jan 19 2018

.REST OF TONIGHT...Southwest winds 15 to 25 knots veering west by
midnight, then increasing to 20 to 30 knots late. Waves 3 to 6
feet occasionally to 8 feet 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.

$$

LSZ267-201045-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
945 PM EST Fri Jan 19 2018

.REST OF TONIGHT...Southwest winds 20 to 30 knots veering west by
midnight. Waves 3 to 5 feet occasionally to 7 feet 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.

$$
LSZ261-201045-
MAFOR 2004/
Superior West 12630 13620 11520 11610 11600. Waves 3 to 5 feet
overnight subsiding to 1 to 3 feet Saturday. Waves 2 feet or less
Saturday evening.

Superior North Central 11640 11630 11730 11720 11710 11610 12600.
Waves 4 to 7 feet overnight subsiding to 1 to 3 feet Saturday and
Saturday evening.

Superior South Central 11630 11640 11630 12720 11710 11600 11500.
Waves 2 to 6 feet overnight subsiding to 1 to 3 feet Saturday.
Waves 2 feet or less Saturday evening.

Superior East 11630 11640 11740 11730 11720 11710 12600. Waves 4
to 7 feet building to 6 to 9 feet overnight. Waves subsiding to
3 to 5 feet Saturday. Waves 2 to 3 feet Saturday 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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