Great Lakes Forecast
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FZUS63 KMQT 170232
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
932 PM EST Sat Dec 16 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 high of 30.2 inches over Ontario will move
southeast into southern Quebec overnight as it strengthens to
30.4 inches. The region will then be influenced by weak ridging
of 30.1 inches through Monday morning before a 29.5 inch trough
moves through the Upper Great Lakes late Monday and into Tuesday.
A high of 30.2 inches over the central Plains will then impact the
region on Wednesday before a strengthening low pressure of 29.5
inches pushes out of the Rockies over to the Plains on Thursday.

LSZ162-171045-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
932 PM EST Sat Dec 16 2017 /832 PM CST Sat Dec 16 2017/

.REST OF TONIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots late. Patchy freezing drizzle. Waves 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots. A slight chance of
freezing drizzle in the morning. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots backing southwest by
midnight. Waves building to 3 to 5 feet occasionally to 7 feet.
.MONDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. A chance of snow showers in the
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...West winds 20 to 30 knots. Waves 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...West winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. A chance of snow showers. Waves
building to 5 to 8 feet occasionally to 10 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots diminishing to 10 to
20 knots after midnight. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots veering northeast. Snow
showers likely. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.THURSDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of snow showers. Waves subsiding to calm to
2 feet.

$$

LSZ263-171045-
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-
932 PM EST Sat Dec 16 2017

.REST OF TONIGHT...Southeast winds 5 to 15 knots becoming
southwest 10 to 20 knots. Isolated snow showers. Patchy freezing
drizzle. Waves 1 to 4 feet.
.SUNDAY...Southwest winds 10 to 20 knots. A slight chance of snow
showers in the morning. A chance of freezing drizzle. Waves
building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots becoming southwest
15 to 25 knots late. Waves building to 3 to 6 feet occasionally
to 8 feet.
.MONDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. A chance of snow showers, possibly
mixed with rain in the afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.MONDAY NIGHT...West gales to 35 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 35 knots. A chance of snow showers in
the morning, then snow showers likely in the afternoon. Waves
building to 7 to 10 feet occasionally to 13 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots diminishing to 15 to
25 knots after midnight. Snow showers likely in the evening. A
chance of snow showers after midnight. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots veering northeast. A
chance of snow showers, then snow showers likely. Waves subsiding
to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of snow showers. Waves subsiding to calm to
2 feet.

$$

LSZ264-171045-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
932 PM EST Sat Dec 16 2017

.REST OF TONIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots by midnight. Scattered snow showers. Waves 1 to 4
feet.
.SUNDAY...South winds 5 to 15 knots becoming west winds 15 to 25
knots early. A slight chance of snow showers in the morning. A
slight chance of drizzle and freezing drizzle. Waves building to 3
to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots late. A slight chance of drizzle and freezing drizzle in
the evening. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.MONDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. A chance of snow showers, possibly
mixed with rain in the afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.MONDAY NIGHT...West gales to 35 knots. A chance of rain and snow
showers. Waves building to 7 to 10 feet occasionally to 13 feet.
.TUESDAY...West gales to 35 knots veering northwest in the
afternoon. A chance of snow showers in the morning, then snow
showers likely in the afternoon. Waves building to 8 to 11 feet
occasionally to 14 feet.
.TUESDAY NIGHT...Northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. Freezing spray. Snow showers likely.
Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots veering northeast. A
chance of snow showers. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of snow showers. Waves calm to 2 feet.

$$

LSZ265-171045-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
932 PM EST Sat Dec 16 2017

.REST OF TONIGHT...Southeast winds 10 to 20 knots veering south
by midnight. Isolated snow showers. Waves 1 to 4 feet.
.SUNDAY...South winds 10 to 20 knots increasing to 15 to 25 knots
by late morning, then becoming southwest 10 to 20 knots by mid
afternoon. Waves 1 to 4 feet.
.SUNDAY NIGHT...Southwest winds 15 to 25 knots veering west by
midnight, then diminishing to 10 to 20 knots late. A slight
chance of freezing drizzle in the evening. Waves 1 to 4 feet.
.MONDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A chance of rain and snow showers in
the afternoon. Waves 1 to 4 feet.
.MONDAY NIGHT...Southwest gales to 35 knots veering west after
midnight. A chance of rain and snow showers. Waves building to
4 to 7 feet occasionally to 9 feet.
.TUESDAY...West gales to 40 knots. Snow showers likely. Waves
building to 7 to 10 feet occasionally to 13 feet.
.TUESDAY NIGHT...Northwest gales to 40 knots. Snow showers
likely. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming northeast
10 to 20 knots. A chance of snow showers, then snow showers
likely. Waves subsiding to calm to 2 feet.
.THURSDAY...Northeast winds 10 to 20 knots. Snow showers likely,
then a chance of snow showers. Waves building to 1 to 3 feet.

$$

LSZ266-171045-
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-
932 PM EST Sat Dec 16 2017

.REST OF TONIGHT...Southeast winds 10 to 20 knots increasing to
15 to 25 knots by midnight, then veering south late. Isolated
snow showers. Waves 1 to 4 feet.
.SUNDAY...South winds 15 to 25 knots veering southwest by mid
afternoon. A slight chance of snow showers in the morning. A
slight chance of freezing drizzle. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...Southwest winds 15 to 25 knots veering west by
midnight, then diminishing to 10 to 20 knots late. A slight
chance of drizzle and freezing drizzle in the evening. Waves
building to 3 to 6 feet occasionally to 8 feet.
.MONDAY...Southwest winds 10 to 20 knots increasing to 20 to
30 knots in the afternoon. A chance of rain and snow showers in
the afternoon. Waves building to 4 to 7 feet occasionally to
9 feet.
.MONDAY NIGHT...Southwest gales to 35 knots veering west after
midnight. Snow showers, possibly mixed with rain. Waves building
to 7 to 10 feet occasionally to 13 feet.
.TUESDAY...West gales to 40 knots veering northwest in the
afternoon. Snow showers likely. Waves building to 10 to 14 feet
occasionally to 18 feet.
.TUESDAY NIGHT...Northwest gales to 40 knots diminishing to 20 to
30 knots after midnight. Snow showers likely. Freezing spray
after midnight. Waves subsiding to 7 to 10 feet occasionally to
13 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming northeast
10 to 20 knots. A chance of snow showers. Waves subsiding to calm
to 2 feet.
.THURSDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. Snow showers likely, then a chance of snow showers.
Waves building to 1 to 3 feet.

$$

LSZ267-171045-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
932 PM EST Sat Dec 16 2017

.REST OF TONIGHT...East winds 10 to 20 knots veering south late.
Isolated snow showers. Waves calm to 2 feet.
.SUNDAY...South winds 15 to 25 knots. A slight chance of freezing
drizzle and snow showers in the afternoon. Waves building to 2 to
4 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots veering southwest by
midnight, then diminishing to 10 to 20 knots late. A chance of
snow showers in the evening. A chance of freezing drizzle. Waves
2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots becoming south 20 to
30 knots in the afternoon. A slight chance of snow showers in the
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...Southwest gales to 35 knots veering west after
midnight. Snow and rain showers likely. Waves building to 8 to 11
feet occasionally to 14 feet.
.TUESDAY...West gales to 40 knots veering northwest in the
afternoon. Rain and snow showers likely. Waves building to 10 to
14 feet occasionally to 18 feet.
.TUESDAY NIGHT...Northwest gales to 40 knots. Snow showers
likely. Waves building to 11 to 15 feet occasionally to 19 feet,
then subsiding to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming northeast
10 to 20 knots. A chance of snow showers, then snow showers
likely. Waves subsiding to calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots. Snow showers likely, then
a chance of snow showers. Waves building to 1 to 3 feet.

$$
LSZ261-171045-
MAFOR 1704/
Superior West 11410 14520 12530 11620. Patchy light freezing
drizzle overnight. Waves 2 to 4 feet.

Superior North Central 12420 11520 14530 11630. Scattered snow
showers late this evening. Waves 2 to 4 feet overnight building
to 3 to 6 feet Sunday.

Superior South Central 12420 13430 13520. Waves 1 to 4 feet.

Superior East 11310 11410 11420 14430 11520. Chance of light
freezing drizzle. Waves 1 to 4 feet.

$$

Borchardt

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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