Great Lakes Forecast
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726
FZUS63 KMQT 160249
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
949 PM 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 29.6 inch low over eastern Ontario will move east
through Saturday. A high of 30.0 inches will slide southeast
across northern Ontario Saturday and strengthen to 30.4 inches by
Saturday night 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.

LSZ162-161100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
949 PM EST Fri Dec 15 2017 /849 PM CST Fri Dec 15 2017/

.REST OF TONIGHT...North winds 5 to 15 knots veering northeast by
midnight, then becoming east 10 to 20 knots late. Scattered snow
showers. Waves calm to 2 feet building to 2 to 4 feet.
.SATURDAY...East winds 15 to 25 knots diminishing to 10 to
20 knots. Numerous snow showers in the morning, then scattered
snow showers in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering southwest
by midnight. Isolated snow showers. 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. Waves building to 1 to
3 feet.
.MONDAY...Southwest winds 10 to 20 knots. A chance of snow
showers in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...West winds 20 to 30 knots. Snow showers, possibly
mixed with rain in the evening. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...West gales to 35 knots veering northwest. A chance of
snow showers. Waves building to 6 to 9 feet occasionally to
11 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots veering east. A
chance of snow showers, then snow showers likely. Waves subsiding
to 2 to 4 feet.

$$

LSZ263-161100-
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-
949 PM EST Fri Dec 15 2017

.REST OF TONIGHT...North winds 5 to 15 knots veering northeast by
midnight, then increasing to 10 to 20 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. Scattered snow showers. Waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots becoming south
5 to 15 knots by midnight, then veering southwest late. Isolated
snow showers. Waves 1 to 3 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves building to 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots. A chance of snow
showers in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots becoming west
gales to 35 knots after midnight. Snow showers, possibly mixed
with rain in the evening, then a chance of snow showers, possibly
mixed with rain 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 8 to 11 feet occasionally to 14 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming east 10 to
20 knots. A chance of snow showers, then snow showers likely.
Waves subsiding to 2 to 4 feet.

$$

LSZ264-161100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
949 PM EST Fri Dec 15 2017

.REST OF TONIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots by midnight, then becoming northeast 5 to 15 knots late.
Scattered snow showers. Waves 3 to 6 feet occasionally to 8 feet
subsiding to 1 to 3 feet.
.SATURDAY...East winds 5 to 15 knots. Isolated snow showers.
Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots veering south by
midnight. Isolated snow showers. Waves building to 1 to 3 feet.
.SUNDAY...South winds 10 to 20 knots veering southwest in the
afternoon. A slight chance of snow showers in the morning. Waves
building to 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots. A chance of snow
showers in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
gales to 35 knots after midnight. Snow showers, possibly mixed
with rain in the evening, then a chance of snow showers, possibly
mixed with rain after midnight. Waves building to 7 to 10 feet
occasionally to 13 feet.
.TUESDAY...West gales to 40 knots veering northwest. A chance of
snow showers, then snow showers likely. Freezing spray. Waves
building to 8 to 11 feet occasionally to 14 feet, then subsiding
to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming northeast
10 to 20 knots. Freezing spray. A chance of snow showers, then
snow showers likely. Waves 2 to 4 feet.

$$

LSZ265-161100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
949 PM EST Fri Dec 15 2017

.REST OF TONIGHT...Northwest winds 10 to 20 knots becoming north
15 to 25 knots by midnight, then becoming northeast 10 to
20 knots late. Freezing spray late in the evening. Scattered snow
showers. Waves 3 to 6 feet occasionally to 8 feet subsiding to
2 to 4 feet.
.SATURDAY...Northeast winds 10 to 20 knots veering east.
Scattered snow showers. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...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 in the afternoon. Waves subsiding to 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. Waves building to 1 to
3 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots becoming west
gales to 35 knots after midnight. Snow showers, possibly mixed
with rain in the evening, then a chance of snow showers, possibly
mixed with rain after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...West gales to 40 knots veering northwest. Snow showers
likely. Waves building to 7 to 10 feet occasionally to 13 feet,
then subsiding to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots veering east. A
chance of snow showers, then snow showers likely. Waves subsiding
to 2 to 4 feet.

$$

LSZ266-161100-
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-
949 PM EST Fri Dec 15 2017

.REST OF TONIGHT...North winds 20 to 30 knots diminishing to
10 to 20 knots late. Freezing spray. Scattered snow showers.
Waves 4 to 7 feet occasionally to 9 feet subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...Northeast winds 10 to 20 knots veering east. Isolated
snow showers. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...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 in the afternoon. A slight chance of snow showers. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots becoming west
gales to 35 knots after midnight. Rain showers likely in the
evening. A chance of snow showers. A chance of rain showers after
midnight. Waves building to 8 to 11 feet occasionally to 14 feet.
.TUESDAY...West gales to 40 knots veering northwest. A chance of
snow showers, then snow showers likely. Freezing spray. Waves
building to 11 to 15 feet occasionally to 19 feet, then subsiding
to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots becoming east 15 to
25 knots. Freezing spray. A chance of snow showers, then snow
showers likely. Waves subsiding to 3 to 5 feet.

$$

LSZ267-161100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
949 PM EST Fri Dec 15 2017

.REST OF TONIGHT...North winds 20 to 30 knots diminishing to
15 to 25 knots late. Freezing spray late in the evening.
Scattered snow showers. Waves 4 to 7 feet occasionally to 9 feet
subsiding to 2 to 4 feet.
.SATURDAY...Northeast winds 10 to 20 knots becoming east 5 to
15 knots by mid afternoon. Isolated snow showers. Waves subsiding
to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots. Isolated snow
showers in the evening. Waves calm to 2 feet.
.SUNDAY...Southeast winds 15 to 25 knots. A slight chance of snow
showers. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of snow showers. Waves subsiding to calm
to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots. Waves building to 2 to
4 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots becoming west
gales to 35 knots after midnight. Snow showers likely. Waves
building to 8 to 11 feet occasionally to 14 feet.
.TUESDAY...West gales to 40 knots veering northwest. Snow
showers. Waves building to 11 to 15 feet occasionally to 19 feet,
then subsiding to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots becoming east 10 to
20 knots. Snow showers likely. Waves subsiding to 2 to 4 feet.

$$
LSZ261-161100-
MAFOR 1604/
Superior West 12120 12237 11330 13320. Scattered snow showers
late overnight. Scattered snow showers Saturday afternoon. Waves
1 to 5 feet.

Superior North Central 11820 11120 11110 13210 12320. Scattered
snow showers overnight. Waves 1 to 5 feet.

Superior South Central 11830 11820 12110 12210 12320. Freezing
spray late this evening. Scattered snow showers overnight and
Saturday morning. Waves 2 to 6 feet.

Superior East 11830 12820 12110 12210 11310. Freezing spray late
this evening. Scattered snow showers overnight and through mid
morning Saturday. Waves 1 to 6 feet.

$$

Petro

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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