Great Lakes Forecast
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000
FZUS63 KMQT 191404
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1004 AM EDT Sat May 19 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 low pressure trough over northeast Minnesota
averaging 29.9 inches will sweep across Lake Superior through this
afternoon and quickly push to eastern Quebec and New England by
daybreak on Sunday. A high pressure ridge of 30.2 inches will
follow over the Upper Great Lakes Sunday into Monday, weakening to
30.1 inches on Tuesday. A weak 29.9 inch trough will then slide
over the upper Great Lakes on Tuesday afternoon before a 30.2 inch
ridge of high pressure returns on Wednesday.

LSZ162-192215-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1004 AM EDT Sat May 19 2018 /904 AM CDT Sat May 19 2018/

.REST OF TODAY...North winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then becoming east 10 to 20 knots
late. Scattered rain showers. Waves 1 to 3 feet building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.TONIGHT...Northeast winds 5 to 15 knots backing north after
midnight, then becoming west less than 10 knots late. Waves
subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds less than 10 knots. Waves calm to
2 feet.
.MONDAY NIGHT...South winds less than 10 knots veering southwest
after midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.

$$

LSZ263-192215-
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-
1004 AM EDT Sat May 19 2018

.REST OF TODAY...North winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Scattered rain showers. Waves 2 to
4 feet building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots after midnight, then becoming west less than 10 knots
late. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots increasing to 10 to
20 knots late. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...Southwest winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots veering east. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ264-192215-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1004 AM EDT Sat May 19 2018

.REST OF TODAY...North winds 15 to 25 knots with a few gale force
gusts to 35 knots. Scattered rain showers. Waves 2 to 4 feet
building to 4 to 7 feet occasionally to 9 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots after midnight, then becoming west 5 to 15 knots late.
Waves subsiding to 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves subsiding to calm
to 2 feet, then building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. Waves building to
1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ265-192215-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1004 AM EDT Sat May 19 2018

.REST OF TODAY...Southeast winds 10 to 20 knots backing north in
the afternoon, then increasing to 20 to 30 knots late. Scattered
rain showers. Waves 1 to 3 feet subsiding to calm to 2 feet, then
building to 4 to 7 feet occasionally to 9 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 5 to
15 knots. Waves subsiding to 2 to 4 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing east by mid afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing south. Waves calm to
2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ266-192215-
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-
1004 AM EDT Sat May 19 2018

.REST OF TODAY...Southeast winds 10 to 20 knots becoming east
15 to 25 knots in the afternoon, then becoming north 20 to
30 knots late. Scattered rain showers. Waves 2 to 4 feet building
to 5 to 8 feet occasionally to 10 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots late. Scattered rain showers through midnight. Waves
building to 6 to 9 feet occasionally to 11 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest late. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing east. Waves calm
to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots backing north. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ267-192215-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1004 AM EDT Sat May 19 2018

.REST OF TODAY...Southeast winds 15 to 25 knots becoming east
10 to 20 knots in the afternoon, then backing northwest late.
Scattered rain showers. Waves 1 to 3 feet subsiding to calm to
2 feet, then building to 1 to 3 feet.
.TONIGHT...North winds 15 to 25 knots increasing to 20 to
30 knots after midnight, then diminishing to 10 to 20 knots late.
Isolated rain showers through midnight. Waves building to 4 to
7 feet occasionally to 9 feet, then subsiding to 2 to 4 feet.
.SUNDAY...North winds 10 to 20 knots backing west in the
afternoon, then diminishing to 5 to 15 knots late. Waves
subsiding to calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots veering north by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing southeast. Waves calm
to 2 feet.
.WEDNESDAY...North winds 5 to 15 knots. Waves calm to 2 feet.

$$
LSZ261-192215-
MAFOR 1915/
Superior West 11830 11130 12220 11810 11700 11600 11500.
Scattered showers this afternoon. Waves 1 to 4 feet this
afternoon and tonight. Waves around 1 foot Sunday morning.

Superior North Central 11840 11846 12840 11830 11820 11700 11610.
Scattered rain showers through early evening tonight. Waves 2 to
4 feet building to 5 to 7 feet this afternoon. Waves 4 to 7 feet
subsiding to 1 to 4 feet tonight and Sunday morning.

Superior South Central 11210 11830 11740 12840 11830 11820 11700.
Scattered showers late this morning through early this evening.
Waves 1 to 5 feet building to 5 to 8 feet tonight. Waves subsiding
to 2 to 5 feet Sunday morning.

Superior East 11320 11210 11730 12840 11830 11820 11700.
Scattered showers this afternoon and evening. Waves 1 to 3 feet
this afternoon building to 3 to 8 feet tonight. Waves subsiding
to 1 to 4 feet on Sunday 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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