Great Lakes Forecast
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FZUS63 KMQT 161344
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
944 AM EDT Mon Apr 16 2018

For waters beyond 5 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 near Pennsylvania will deepen to 29.4
inches and spin back towards Georgian Bay by late tonight. A
brief ridge of 30.0 inches will then move over the region
Wednesday morning after which another low of 29.5 inches will move
out of the Rockies into the central Plains, passing through the
Great Lakes late on Wednesday and Wednesday night. A 30.3 inch
high will then move over the western Great Lakes by late Thursday,
building to 30.5 inches over Lake Superior on Friday.

LSZ162-162145-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
944 AM EDT Mon Apr 16 2018 /844 AM CDT Mon Apr 16 2018/

.REST OF TODAY...North winds 15 to 25 knots. Freezing spray by
late morning. A slight chance of snow. Waves 8 to 11 feet
occasionally to 14 feet subsiding to 6 to 9 feet occasionally to
11 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots late. A chance of snow. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then becoming northeast 5 to 15 knots
late. A slight chance of snow showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A slight chance of snow showers.
Waves 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northeast winds 5 to 15 knots becoming south less
than 10 knots. Waves subsiding to 2 to 4 feet.
.FRIDAY...East winds less than 10 knots backing northwest. Waves
2 to 4 feet.

$$

LSZ263-162145-
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-
944 AM EDT Mon Apr 16 2018

.REST OF TODAY...North winds 20 to 30 knots. Freezing spray by
late morning. A chance of snow. Waves 8 to 11 feet occasionally
to 14 feet subsiding to 5 to 8 feet occasionally to 10 feet, then
building to 6 to 9 feet occasionally to 11 feet.
.TONIGHT...North winds 20 to 30 knots. Snow likely through
midnight, then a chance of snow after midnight. Waves building to
6 to 10 feet occasionally to 13 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. A slight chance of snow showers.
Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. Waves building to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 5 to 15 knots becoming west less than
10 knots. Waves subsiding to 1 to 3 feet.
.FRIDAY...East winds less than 10 knots veering southwest. Waves
subsiding to calm to 2 feet.

$$

LSZ264-162145-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
944 AM EDT Mon Apr 16 2018

.REST OF TODAY...North winds 20 to 30 knots. Freezing spray.
Snow. Waves 8 to 11 feet occasionally to 14 feet subsiding to 7 to
10 feet occasionally to 13 feet.
.TONIGHT...North winds 20 to 30 knots. Freezing spray through
midnight. Snow through midnight, then a chance of snow after
midnight. Waves building to 7 to 11 feet occasionally to 14 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots late. A slight chance of snow showers. Waves subsiding
to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...North winds 15 to 25 knots. A slight chance of
rain showers through midnight. A slight chance of snow showers.
Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.WEDNESDAY NIGHT...Northeast winds 20 to 30 knots. Waves building
to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots veering southwest. Waves calm
to 2 feet.

$$

LSZ265-162145-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
944 AM EDT Mon Apr 16 2018

.REST OF TODAY...North winds 20 to 30 knots. Freezing spray.
Snow. Waves 6 to 9 feet occasionally to 11 feet building to 7 to
10 feet occasionally to 13 feet.
.TONIGHT...North winds 20 to 30 knots. Snow through midnight,
then a chance of snow after midnight. Waves 7 to 10 feet
occasionally to 13 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A chance of snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots. A slight chance of
snow showers. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. Waves building
to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots veering southwest. Waves calm
to 2 feet.

$$

LSZ266-162145-
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-
944 AM EDT Mon Apr 16 2018

.REST OF TODAY...Northeast winds 20 to 30 knots. Freezing spray.
Snow. Waves 7 to 10 feet occasionally to 13 feet.
.TONIGHT...North winds 20 to 30 knots. Snow through midnight,
then a chance of snow after midnight. Waves building to 7 to 11
feet occasionally to 14 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots late. A slight chance of snow showers. Waves subsiding
to 4 to 7 feet occasionally to 9 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots. A slight chance of
rain and snow showers through midnight. Waves subsiding to 2 to
4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing southwest. Waves calm
to 2 feet.

$$

LSZ267-162145-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
944 AM EDT Mon Apr 16 2018

.REST OF TODAY...Northeast winds 15 to 25 knots backing north in
the afternoon, then increasing to 20 to 30 knots late. Snow.
Waves 4 to 7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet, then building to 4 to 7 feet occasionally
to 9 feet.
.TONIGHT...North winds 20 to 30 knots. Snow through midnight,
then a chance of snow after midnight. Waves 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A chance of snow showers through early
afternoon. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. Waves 1 to 3 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots becoming north
20 to 30 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...North winds 10 to 20 knots becoming west 5 to 15 knots.
Waves calm to 2 feet.

$$
LSZ261-162145-
MAFOR 1615/
Superior West 11841 12830 14840 11830. Chance of snow this
evening. Waves 6 to 10 feet subsiding to 4 to 7 feet this
afternoon and to 3 to 6 feet Tuesday morning.

Superior North Central 14847 11847 13840. Freezing spray this
afternoon and evening. Chance of snow late tonight through mid
morning Tuesday morning. Waves 7 to 10 feet.

Superior South Central 15847 11840 11830. Freezing spray this
afternoon. Chance of snow showers Tuesday morning. Waves 6 to 11
feet.

Superior East 11137 12837 12847 12840 11830. Freezing spray late
this morning. Chance of snow overnight. Waves 5 to 8 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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