Great Lakes Forecast
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FZUS63 KMQT 161458
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
958 AM 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 will slide southeast across
northern Ontario today and strengthen to 30.4 inches by tonight
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. Lake Superior
will be between systems Wednesday as low pressure of 29.5 inches
pushes out of the Rockies and into the Plains.

LSZ162-162300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
958 AM EST Sat Dec 16 2017 /858 AM CST Sat Dec 16 2017/

.REST OF TODAY...East winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then becoming southeast 5 to 15 knots
by mid afternoon. Numerous snow showers late in the morning.
Scattered snow showers in the afternoon. Waves 3 to 5 feet
occasionally to 7 feet subsiding to 1 to 3 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering southwest by
midnight. Isolated snow showers in the evening. A slight chance
of freezing rain after midnight. Waves 1 to 3 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves 1 to 3 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots becoming southwest 10 to
20 knots after midnight. Waves building to 2 to 4 feet.
.MONDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A chance of snow showers and drizzle
in the afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.MONDAY NIGHT...West gales to 35 knots diminishing to 20 to
30 knots after midnight. A chance of drizzle and snow showers.
Waves 4 to 7 feet occasionally to 9 feet.
.TUESDAY...West winds 20 to 30 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.
.WEDNESDAY...Northwest winds 10 to 20 knots veering northeast. A
chance of snow showers. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.

$$

LSZ263-162300-
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-
958 AM EST Sat Dec 16 2017

.REST OF TODAY...East winds 10 to 20 knots becoming southeast
5 to 15 knots by mid afternoon. Scattered snow showers. Waves
2 to 4 feet subsiding to 1 to 3 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south by
midnight, then becoming southwest 5 to 15 knots late. Isolated
snow showers. A slight chance of freezing rain after midnight.
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. Waves building to 3 to
5 feet occasionally to 7 feet.
.MONDAY...Southwest winds 15 to 25 knots. A chance of drizzle and
snow showers in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.MONDAY NIGHT...West gales to 35 knots. Rain showers likely in
the evening. A chance of drizzle and snow showers. Waves building
to 6 to 9 feet occasionally to 11 feet.
.TUESDAY...West gales to 35 knots veering northwest. A chance of
snow showers. Waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots veering northeast. A
chance of snow showers. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.

$$

LSZ264-162300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
958 AM EST Sat Dec 16 2017

.REST OF TODAY...East winds 5 to 15 knots. Scattered snow
showers. Waves 1 to 3 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to
20 knots by midnight. Isolated snow showers. A slight chance of
freezing rain after midnight. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.SUNDAY...South winds 10 to 20 knots veering southwest. A slight
chance of freezing drizzle. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots. A slight chance of
drizzle in the evening. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...Southwest winds 15 to 25 knots. A chance of drizzle and
snow showers in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.MONDAY NIGHT...West gales to 35 knots. Snow showers likely,
possibly mixed with rain and drizzle in the evening, then a chance
of snow showers and drizzle after midnight. Waves building to 6
to 9 feet occasionally to 11 feet.
.TUESDAY...West gales to 35 knots veering northwest. A chance of
snow showers, then snow showers likely. Freezing spray. Waves
building to 7 to 10 feet occasionally to 13 feet, then 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. Waves subsiding to calm
to 2 feet.

$$

LSZ265-162300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
958 AM EST Sat Dec 16 2017

.REST OF TODAY...East winds 10 to 20 knots. Scattered snow
showers. Waves 2 to 4 feet subsiding to calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south by
midnight. Isolated snow showers in the evening. Waves building to
1 to 3 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. A slight chance of freezing drizzle. A slight chance
of snow showers in the afternoon. Waves building to 2 to 4 feet,
then subsiding to calm to 2 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots. Waves building to 1 to
3 feet.
.MONDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A chance of snow showers and drizzle
in the afternoon. Waves building to 2 to 4 feet.
.MONDAY NIGHT...Southwest gales to 35 knots veering west after
midnight. Rain showers likely in the evening. A chance of drizzle
and snow showers. Waves building to 4 to 7 feet occasionally to
9 feet.
.TUESDAY...West gales to 40 knots becoming northwest gales to
35 knots. Snow showers likely. Waves building to 6 to 9 feet
occasionally to 11 feet, then 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.

$$

LSZ266-162300-
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-
958 AM EST Sat Dec 16 2017

.REST OF TODAY...Northeast winds 10 to 20 knots veering east.
Isolated snow showers. Waves 2 to 4 feet subsiding to calm to
2 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south by
midnight. Isolated snow showers. Waves building to 1 to 3 feet.
.SUNDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of freezing drizzle and a
slight chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. A slight chance of freezing drizzle in the evening. A
slight chance of drizzle. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A slight chance of drizzle and 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. Rain and snow showers in the evening. A chance of
drizzle. A chance of snow showers after midnight. Waves building
to 7 to 10 feet occasionally to 13 feet.
.TUESDAY...West gales to 40 knots becoming northwest gales to
35 knots. Drizzle likely. Snow showers likely. Freezing spray.
Waves building to 10 to 14 feet occasionally to 18 feet, then
subsiding to 6 to 9 feet occasionally to 11 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, then building to 1 to
3 feet.

$$

LSZ267-162300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
958 AM EST Sat Dec 16 2017

.REST OF TODAY...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots by late morning, then veering east by mid
afternoon. Isolated snow showers. Waves 1 to 3 feet subsiding to
calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots veering south by midnight.
Isolated snow showers in the evening. Waves calm to 2 feet.
.SUNDAY...South winds 15 to 25 knots. A chance of snow showers. A
chance of freezing drizzle in the afternoon. Waves building to
1 to 3 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots becoming southwest
10 to 20 knots after midnight. A chance of freezing drizzle and a
slight chance of snow showers. A slight chance of drizzle after
midnight. Waves 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A slight chance of drizzle and snow
showers in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...Southwest gales to 35 knots veering west after
midnight. Snow showers in the evening. Rain showers. A chance of
snow showers and drizzle likely after midnight. Waves building to
8 to 11 feet occasionally to 14 feet.
.TUESDAY...West gales to 40 knots becoming northwest gales to
35 knots. Drizzle likely. Snow showers. Waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 6 to 9 feet
occasionally to 11 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.

$$

LSZ261-162300-
MAFOR 1616/
Superior West 14320 11420 13520. Scattered snow showers this
afternoon. Waves 2 to 5 feet.

Superior North Central 12210 11310 11320 13420 11430. Scattered
snow showers late this morning. Waves 1 to 4 feet.

Superior South Central 13210 11320 13420 11430. Scattered snow
showers this afternoon. Waves 1 to 4 feet.

Superior East 11110 13210 11310 12410 11420. Waves 1 to 3 feet.

$$

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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