Great Lakes Forecast
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FZUS63 KMQT 151453
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
953 AM EST Fri Dec 15 2017

For waters beyond five 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...A weak low of 29.7 inches over eastern Lake Superior
will move into eastern Ontario late today. A high of 30.0 inches
will then move through Ontario Saturday and strenghten to 30.4
inches by the overnight just east of Lake Superior. The region will
then be influenced by a weak high of 30.2 inches centered in the
northern Great Plains Sunday and Monday before a 29.5 inch trough
moves through the Upper Great Lakes Monday night and into Tuesday.

LSZ162-152300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
953 AM EST Fri Dec 15 2017 /853 AM CST Fri Dec 15 2017/

.REST OF TODAY...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots by mid afternoon. Scattered snow showers. Waves
1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots veering northeast by
midnight, then becoming east 10 to 20 knots late. Scattered snow
showers. Waves building to 1 to 3 feet.
.SATURDAY...East winds 10 to 20 knots veering southeast by late
morning, then diminishing to 5 to 15 knots by mid afternoon. A
chance of snow showers. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. A slight chance of snow showers in the evening.
Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves building to 1 to 3 feet.
.MONDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots. A chance of snow showers, possibly mixed with rain and
freezing rain. Snow showers, possibly mixed with rain. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TUESDAY...West gales to 35 knots veering northwest. A chance of
snow showers. Waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 2 to 4 feet.

$$

LSZ263-152300-
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-
953 AM EST Fri Dec 15 2017

.REST OF TODAY...Northwest winds 10 to 20 knots veering north by
late morning, then backing northwest by mid afternoon. Scattered
snow showers. Waves 3 to 5 feet occasionally to 7 feet subsiding
to 1 to 3 feet.
.TONIGHT...North winds 10 to 20 knots becoming northeast 5 to
15 knots late. Scattered snow showers. Waves 1 to 3 feet.
.SATURDAY...East winds 10 to 20 knots becoming southeast 5 to
15 knots by mid afternoon. A chance of snow showers. Waves 1 to
3 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. A slight chance of snow showers. A slight chance
of freezing rain after midnight. Waves subsiding to calm to
2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 1 to 3 feet.
.MONDAY...Southwest winds 15 to 25 knots becoming west gales to
35 knots. A chance of rain showers, then snow showers, possibly
mixed with rain. Waves building to 6 to 9 feet occasionally to
11 feet.
.TUESDAY...West gales to 35 knots veering northwest. A chance of
snow showers. Freezing spray. Waves building to 7 to 10 feet
occasionally to 13 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ264-152300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
953 AM EST Fri Dec 15 2017

.REST OF TODAY...North winds 15 to 25 knots. Scattered snow
showers. Waves 3 to 6 feet occasionally to 8 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots by midnight, then becoming northeast 5 to 15 knots late.
Scattered snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 1 to 3 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering east. A slight
chance of snow showers. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. A slight chance of snow showers. Waves building
to 1 to 3 feet.
.SUNDAY...South winds 5 to 15 knots veering southwest in the
afternoon. Waves 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots becoming west gales to
35 knots. Snow showers, possibly mixed with rain. Waves building
to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...West gales to 40 knots veering northwest. A chance of
snow showers. Freezing spray. Waves building to 8 to 11 feet
occasionally to 14 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.

$$

LSZ265-152300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
953 AM EST Fri Dec 15 2017

.REST OF TODAY...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots by mid afternoon. Scattered snow showers late in
the morning, then numerous snow showers in the afternoon. Waves
3 to 6 feet occasionally to 8 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots late. Scattered snow showers. Waves subsiding to 2 to
4 feet.
.SATURDAY...Northeast winds 10 to 20 knots veering southeast by
mid afternoon. A chance of snow showers. Waves subsiding to calm
to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A slight chance of snow showers. Waves calm to
2 feet.
.SUNDAY...South winds 10 to 20 knots veering southwest in the
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots increasing to gales to
35 knots. Snow showers, possibly mixed with rain. Waves building
to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...West gales to 40 knots veering northwest. Snow showers
likely. Freezing spray. Waves building to 8 to 11 feet
occasionally to 14 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.

$$

LSZ266-152300-
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-
953 AM EST Fri Dec 15 2017

.REST OF TODAY...North winds 20 to 30 knots with a few gale force
gusts to 35 knots in the morning. Numerous snow showers through
noon, then scattered snow showers in the afternoon. Freezing
spray in the afternoon. Waves 3 to 5 feet occasionally to 7 feet
building to 4 to 7 feet occasionally to 9 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots. Freezing spray in the evening. Scattered snow showers.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...Northeast winds 10 to 20 knots veering east. A chance
of snow showers. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A slight chance of snow showers. Waves calm to
2 feet.
.SUNDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots. Waves building to
2 to 4 feet.
.MONDAY...Southwest winds 10 to 20 knots increasing to gales to
35 knots. Snow showers likely, possibly mixed with rain showers.
Waves building to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...West gales to 40 knots veering northwest. Snow showers
likely. Freezing spray. Waves building to 11 to 15 feet
occasionally to 19 feet, then subsiding to 10 to 14 feet
occasionally to 18 feet.

$$

LSZ267-152300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
953 AM EST Fri Dec 15 2017

.REST OF TODAY...Northwest winds 20 to 30 knots veering north by
late morning. Numerous snow showers through noon, then scattered
snow showers in the afternoon. Waves 1 to 3 feet building to 4 to
7 feet occasionally to 9 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots by midnight. Scattered snow showers. Waves subsiding to
2 to 4 feet.
.SATURDAY...Northeast winds 10 to 20 knots becoming east 5 to
15 knots by mid afternoon. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots. A slight chance
of snow showers after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots veering south in the
afternoon. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of freezing rain. Waves calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots increasing to 20 to
30 knots. A chance of snow showers, possibly mixed with rain.
Waves building to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...West gales to 40 knots veering northwest. Rain showers
likely. Snow showers likely. Freezing spray. Waves building to
12 to 17 feet occasionally to 21 feet, then subsiding to 10 to
14 feet occasionally to 18 feet.

$$
LSZ261-152300-
MAFOR 1516/
Superior West 11720 12710 11820 12120 12220. Scattered snow
showers late tonight through Saturday morning. Waves 1 to 4 feet.

Superior North Central 14830 12820 12110. Scattered snow showers.
Waves 3 to 6 feet this afternoon, subsiding to 2 to 4 feet
tonight and Saturday morning.

Superior South Central 14737 11830 11820 12110. Freezing spray
this afternoon. Scattered snow showers from late evening through
Saturday morning. Waves 3 to 7 feet this afternoon and tonight,
subsiding to 2 to 4 feet Saturday morning.

Superior East 11840 19850 11840 13830 11820 11810 11110.
Scattered snow showers. Waves 3 to 7 feet this afternoon and
evening, subsiding to 2 to 4 feet late tonight through Saturday
morning.

$$

KCW

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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