Great Lakes Forecast
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FZUS63 KMQT 171407
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1007 AM EDT Tue Apr 17 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 29.5 inch low east of Lake Superior will slowly
shift east into Quebec today. A brief ridge of 30.0 inches will
move over Lake Superior 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. 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 and
remaining in place through the upcoming weekend.

LSZ162-172215-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1007 AM EDT Tue Apr 17 2018 /907 AM CDT Tue Apr 17 2018/

.REST OF TODAY...North winds 15 to 25 knots becoming northeast
10 to 20 knots late. Isolated snow showers by late morning. Waves
3 to 5 feet occasionally to 7 feet subsiding to calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots increasing to 15 to
25 knots. Waves building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. A slight chance of
rain showers, freezing rain and snow showers through early
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.THURSDAY...North winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds less than 10 knots veering north
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds less than 10 knots veering southwest. Waves
calm to 2 feet.
.SATURDAY...Southwest winds less than 10 knots backing south.
Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-172215-
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-
1007 AM EDT Tue Apr 17 2018

.REST OF TODAY...North winds 20 to 30 knots diminishing to 15 to
25 knots late. Isolated snow showers by late morning. Waves 5 to
8 feet occasionally to 10 feet subsiding to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...North winds 10 to 20 knots veering northeast after
midnight, then increasing to 15 to 25 knots late. Waves subsiding
to 1 to 3 feet, then building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. A slight chance of
rain showers, freezing rain and snow showers through early
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots. Waves subsiding to
2 to 4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...North winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots becoming north less
than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...South winds less than 10 knots. Waves calm to 2 feet.
.SATURDAY...Southwest winds less than 10 knots backing south.
Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-172215-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1007 AM EDT Tue Apr 17 2018

.REST OF TODAY...North winds 20 to 30 knots with a few gale force
gusts to 35 knots. Freezing spray by late morning. Isolated snow
showers by late morning. Waves 6 to 9 feet occasionally to 11 feet
subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...North winds 20 to 30 knots. Waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northeast winds 20 to 30 knots backing north late.
Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-172215-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1007 AM EDT Tue Apr 17 2018

.REST OF TODAY...North winds 20 to 30 knots with a few gale force
gusts to 35 knots diminishing to 15 to 25 knots late. Scattered
snow showers. Waves 6 to 9 feet occasionally to 11 feet building
to 7 to 10 feet occasionally to 13 feet, then subsiding to 5 to 8
feet occasionally to 10 feet.
.TONIGHT...North winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots becoming north 20 to
30 knots late. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots. A slight chance of
snow showers through midnight. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...North winds 15 to 25 knots backing northwest by mid
afternoon. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.
.SATURDAY...Southeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-172215-
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-
1007 AM EDT Tue Apr 17 2018

.REST OF TODAY...North winds 20 to 30 knots with a few gale force
gusts to 35 knots. Scattered snow showers. Waves 6 to 10 feet
occasionally to 13 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots late. 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 becoming north 20 to
30 knots late. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 20 to 30 knots. A slight chance of
rain and snow showers through midnight. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY...North winds 15 to 25 knots backing northwest by mid
afternoon. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots veering south. Waves calm to
2 feet.
.SATURDAY...Southeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-172215-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1007 AM EDT Tue Apr 17 2018

.REST OF TODAY...North winds 20 to 30 knots backing northwest in
the afternoon. Scattered snow showers by late morning. Waves 4 to
8 feet occasionally to 10 feet.
.TONIGHT...North winds 15 to 25 knots. Waves subsiding to 1 to
3 feet.
.WEDNESDAY...North winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.WEDNESDAY NIGHT...North winds 15 to 25 knots increasing to 20 to
30 knots after midnight. A slight chance of rain and snow showers
through midnight. Waves building to 3 to 5 feet occasionally to
7 feet.
.THURSDAY...North winds 20 to 30 knots. Waves subsiding to 2 to
4 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing west. Waves calm
to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-172215-
MAFOR 1715/
Superior West 12830 12110 11820 11120 12130. Waves 3 to 5 feet
subsiding to 1 to 4 feet this afternoon and tonight. Waves 3 to 6
feet Wednesday morning.

Superior North Central 12840 14830 11130 11140. Waves 5 to 8 feet
this afternoon subsiding to 3 to 7 feet tonight and Wednesday
morning.

Superior South Central 12840 14830 11130 11120. Scattered snow
showers late this morning. Waves 6 to 10 feet this afternoon
subsiding to 5 to 8 feet tonight and Wednesday morning.

Superior East 11840 11740 14830 11830 11120. Scattered snow
showers late this morning. Waves 5 to 8 feet this afternoon
subsiding to 3 to 6 feet tonight and Wednesday morning.

$$

JSS

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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