Great Lakes Forecast
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FZUS63 KMQT 130843
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
343 AM EST Wed Dec 13 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 low pressure system of 29.5 inches over northern
Minnesota this morning will move to southern Lake Michigan this
afternoon. A weak low pressure system of 30.0 inches will then
form near Lake Superior Thursday and strengthen on Friday as it
moves over Lake Huron to 29.6 inches by the evening. Weak ridging
of 30.2 inches Saturday will give way to another trough on Sunday.

LSZ162-131645-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
343 AM EST Wed Dec 13 2017 /243 AM CST Wed Dec 13 2017/

.EARLY THIS MORNING...East winds 10 to 20 knots. Snow. Waves 1 to
3 feet.
.TODAY...East winds 15 to 25 knots diminishing to 10 to 20 knots
by late morning, then becoming northeast 20 to 30 knots by mid
afternoon. Snow. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.TONIGHT...Northeast winds 15 to 25 knots becoming north 5 to
15 knots by midnight. Isolated snow showers. Waves subsiding to
1 to 3 feet.
.THURSDAY...Northwest winds 5 to 15 knots. A slight chance of
snow showers. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A chance of snow showers. Waves
building to 1 to 3 feet.
.FRIDAY...Northwest winds 10 to 20 knots veering north in the
afternoon. A chance of snow showers. Waves 1 to 3 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots veering south. A chance
of snow showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots increasing to 15 to 25 knots.
Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ263-131645-
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-
343 AM EST Wed Dec 13 2017

.EARLY THIS MORNING...Southeast winds 10 to 20 knots. A chance of
snow. Waves 1 to 3 feet.
.TODAY...East winds 10 to 20 knots increasing to 15 to 25 knots
by late morning, then backing northeast by mid afternoon. A
chance of snow in the morning, then numerous snow showers in the
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots. Scattered snow showers. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest. A chance
of snow showers. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A chance of snow showers. Waves
building to 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots. A chance of snow showers.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots veering south. A chance
of snow showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots increasing to 15 to 25 knots.
A chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ264-131645-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
343 AM EST Wed Dec 13 2017

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. A chance of
snow. Waves calm to 2 feet.
.TODAY...East winds 10 to 20 knots increasing to 15 to 25 knots
by late morning, then backing northeast by mid afternoon. Snow.
Waves building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots. Scattered snow showers. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 5 to 15 knots backing northwest by late
morning, then increasing to 10 to 20 knots by mid afternoon. A
slight chance of snow showers. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots. A chance of
snow showers. Waves 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. A chance of snow showers. Waves building to
3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots. A chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.SUNDAY...West winds 5 to 15 knots increasing to 15 to 25 knots.
A chance of snow showers. Waves subsiding to calm to 2 feet, then
building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ265-131645-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
343 AM EST Wed Dec 13 2017

.EARLY THIS MORNING...Southeast winds 10 to 20 knots. A chance of
snow. Waves calm to 2 feet.
.TODAY...Southeast winds 15 to 25 knots backing northeast by mid
afternoon. Snow. Waves building to 2 to 4 feet.
.TONIGHT...North winds 15 to 25 knots. Scattered snow showers.
Waves 2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A chance of snow showers in the
evening, then snow showers likely after midnight. Waves 1 to
3 feet.
.FRIDAY...North winds 15 to 25 knots. Snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of snow showers. Waves building
to 3 to 6 feet occasionally to 8 feet, then subsiding to 1 to
3 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of snow showers, then snow showers likely.
Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.
.SUNDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots. A chance of snow showers. Waves subsiding to calm to
2 feet, then building to 2 to 4 feet.

$$

LSZ266-131645-
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-
343 AM EST Wed Dec 13 2017

.EARLY THIS MORNING...Southeast winds 10 to 20 knots. A chance of
snow. Waves calm to 2 feet.
.TODAY...East winds 15 to 25 knots becoming northeast 20 to
30 knots by mid afternoon. A chance of snow. Waves building to
2 to 4 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots by midnight. Scattered snow showers. Waves 2 to 4 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by late
morning, then increasing to 15 to 25 knots by mid afternoon. A
chance of snow showers. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. A chance of snow showers in the
evening, then snow showers after midnight. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.FRIDAY...North winds 15 to 25 knots. Snow showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of snow showers. Waves subsiding to calm to
2 feet, then building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots. A chance of snow showers. Waves subsiding to calm to
2 feet, then building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ267-131645-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
343 AM EST Wed Dec 13 2017

.EARLY THIS MORNING...East winds 10 to 20 knots. A slight chance
of snow. Waves calm to 2 feet.
.TODAY...East winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. A slight chance of snow. Waves
building to 1 to 3 feet.
.TONIGHT...Northeast winds 15 to 25 knots backing north by
midnight. Scattered snow showers. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest. A
chance of snow showers in the morning, then snow showers likely
in the afternoon. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Snow showers. Waves building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. Snow showers. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of snow showers. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 1 to
3 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming south 15 to
25 knots. A chance of snow showers. Waves subsiding to calm to
2 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...South winds 15 to 25 knots veering west. A chance of
snow showers. Waves subsiding to calm to 2 feet, then building to
3 to 5 feet occasionally to 7 feet.

$$

LSZ261-131645-
MAFOR 1310/
Superior West 13237 12147 11130 11820 11810. Freezing spray
through early this evening. Scattered snow showers this evening.
Waves 2 to 6 feet.

Superior North Central 11320 12230 12130 11830 12820. Scattered
snow showers. Waves 1 to 5 feet.

Superior South Central 12320 11220 12130 11830 12820. Scattered
snow showers. Waves 1 to 4 feet.

Superior East 13220 11120 12130 12820. Scattered snow showers
from late evening through tonight. Waves 1 to 4 feet.

$$

KEC

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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