Great Lakes Forecast
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FZUS63 KMQT 261348
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
948 AM EDT Thu Apr 26 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 weak trough of 29.8 inches crossing Lake Superior
through this afternoon will reach the lower Great Lakes tonight.
On Friday, a low of 29.8 inches will track from northern Minnesota
to southern Wisconsin, just grazing western Lake Superior. This
low will eventually slide across the lower Great Lakes later
Friday and merge with another area of low pressure over southern
Quebec and New England on Saturday, while deepening to 29.5
inches. Behind this low pressure system, high pressure of 30.0
inches will move from the northern Plains to the western Great
Lakes through Sunday.

LSZ162-262200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
948 AM EDT Thu Apr 26 2018 /848 AM CDT Thu Apr 26 2018/

.REST OF TODAY...Southwest winds 5 to 15 knots veering northwest
in the afternoon. Scattered rain showers by late morning. Areas
of drizzle. Waves 1 to 3 feet building to 2 to 4 feet, then
subsiding to calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots veering northeast after
midnight, then veering southeast late. Scattered rain showers,
possibly mixed with snow after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots backing northeast in the
afternoon. A chance of rain and snow showers. Waves building to
1 to 3 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering south by mid
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...South winds less than 10 knots veering
southwest after midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. A chance of rain showers.
Waves calm to 2 feet.

$$

LSZ263-262200-
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-
948 AM EDT Thu Apr 26 2018

.REST OF TODAY...Southwest winds 5 to 15 knots becoming west
10 to 20 knots in the afternoon, then veering north late. Patchy
drizzle by late morning. Scattered rain showers by mid afternoon.
Waves 2 to 4 feet.
.TONIGHT...North winds 5 to 15 knots veering east after midnight.
Scattered rain and snow showers after midnight. Waves subsiding
to 1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...East winds 5 to 15 knots backing northeast in the
afternoon. A chance of snow showers, possibly mixed with rain.
Waves building to 1 to 3 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
calm to 2 feet, then building to 3 to 5 feet occasionally to
7 feet.
.SATURDAY...North winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots. A chance of rain showers.
Waves calm to 2 feet.

$$

LSZ264-262200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
948 AM EDT Thu Apr 26 2018

.REST OF TODAY...Southwest winds 10 to 20 knots becoming west
15 to 25 knots in the afternoon, then veering north late.
Scattered rain showers by mid afternoon. Waves 1 to 3 feet
building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...North winds 10 to 20 knots veering east late. Waves
subsiding to 2 to 4 feet.
.FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing north late. A slight
chance of snow showers through early afternoon. Waves subsiding
to 1 to 3 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots veering northeast
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.SATURDAY...North winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots. A chance of rain showers.
Waves building to 1 to 3 feet.

$$

LSZ265-262200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
948 AM EDT Thu Apr 26 2018

.REST OF TODAY...Southwest winds 10 to 20 knots becoming west
5 to 15 knots in the afternoon, then becoming northwest 15 to
25 knots late. Scattered rain showers by mid afternoon. Waves
calm to 2 feet building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing north late. A slight
chance of snow showers. A slight chance of rain showers by mid
afternoon. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots. Waves building to
4 to 7 feet occasionally to 9 feet.
.SATURDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. Waves building to 1 to
3 feet.

$$

LSZ266-262200-
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-
948 AM EDT Thu Apr 26 2018

.REST OF TODAY...South winds 10 to 20 knots veering northwest
late. Scattered rain showers by mid afternoon. Waves 1 to 3 feet
building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots late. Areas of drizzle through midnight. Waves building
to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to
5 feet occasionally to 7 feet.
.FRIDAY...North winds 10 to 20 knots increasing to 15 to 25 knots
late. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots. Waves building to
4 to 7 feet occasionally to 9 feet.
.SATURDAY...North winds 15 to 25 knots backing northwest by mid
afternoon. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves building to 1 to 3 feet.
.MONDAY...South winds 15 to 25 knots. A chance of rain showers.
Waves subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ267-262200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
948 AM EDT Thu Apr 26 2018

.REST OF TODAY...South winds 10 to 20 knots becoming west 5 to
15 knots late. Scattered rain showers and patchy drizzle by mid
afternoon. Waves calm to 2 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming north 15 to
25 knots after midnight. Isolated rain showers through midnight.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...North winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots. Waves building to
3 to 6 feet occasionally to 8 feet.
.SATURDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves building to 1 to 3 feet.
.MONDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers. Waves subsiding to calm to
2 feet, then building to 3 to 5 feet occasionally to 7 feet.

$$
LSZ261-262200-
MAFOR 2615/
Superior West 11625 11720 11710 11610 11710 11200 11310 11210.
Scattered rain showers with areas of drizzle early this
afternoon. Scattered rain and snow showers Friday morning. Waves
1 to 4 feet.

Superior North Central 11620 11720 13820 13110. Scattered rain
showers late this afternoon. Waves 1 to 3 feet building to 3 to 5
feet this afternoon. Waves 3 to 5 feet subsiding to 2 to 4 feet
tonight through Friday morning.

Superior South Central 11510 11620 12730 13820 11800. Scattered
rain showers late this afternoon through early evening tonight.
Waves 1 to 3 feet this afternoon. Waves 3 to 6 feet tonight and
Friday morning.

Superior East 12410 11620 11735 12830 11820 11810. Scattered rain
showers with areas of drizzle this evening. Waves 1 to 3 feet
this afternoon. Waves 2 to 4 feet building to 4 to 7 feet tonight.
Waves 2 to 5 feet Friday morning.

$$

Voss

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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