Great Lakes Forecast
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FZUS63 KMQT 251359
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
959 AM EDT Wed Apr 25 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 ridge of 30.1 inches will cross the Upper Great
Lakes today, followed by a weak trough of 29.8 inches on Thursday.
On Friday, a low of 29.8 inches will track across the Upper Great
Lakes region. This low will track into Quebec and merge with
another area of low pressure, deepening to 29.3 inches on
Saturday. Behind this low pressure system, high pressure of 30.0
inches will drop into the northern Plains. By Sunday, this high
pressure will strengthen to 30.3 inches as it tracks across the
region.

LSZ162-252200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
959 AM EDT Wed Apr 25 2018 /859 AM CDT Wed Apr 25 2018/

.REST OF TODAY...Southwest winds less than 10 knots becoming
south 5 to 15 knots in the afternoon. Waves calm to 2 feet
building to 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.THURSDAY...West winds 5 to 15 knots veering north in the
afternoon. A slight chance of rain showers. Waves subsiding to
calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots backing southwest
after midnight. A slight chance of snow showers after midnight.
Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots becoming northwest 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves building to 2 to 4 feet.

$$

LSZ263-252200-
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-
959 AM EDT Wed Apr 25 2018

.REST OF TODAY...Northwest winds less than 10 knots becoming
southwest 5 to 15 knots in the afternoon. Waves calm to 2 feet
building to 1 to 3 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves building to 2 to
4 feet.
.THURSDAY...West winds 10 to 20 knots becoming north 15 to
25 knots in the afternoon. A chance of rain showers. A chance of
snow showers by mid afternoon. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. A slight chance of snow showers
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. A chance of snow showers, possibly mixed with rain.
Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering south. Waves calm
to 2 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves building to 2 to 4 feet.

$$

LSZ264-252200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
959 AM EDT Wed Apr 25 2018

.REST OF TODAY...North winds 5 to 15 knots backing west in the
afternoon, then becoming southwest 10 to 20 knots late. Waves
1 to 3 feet subsiding to calm to 2 feet, then building to 1 to
3 feet.
.TONIGHT...Southwest winds 10 to 20 knots increasing to 15 to
25 knots late. Waves 1 to 3 feet.
.THURSDAY...Southwest winds 15 to 25 knots veering north in the
afternoon, then increasing to 20 to 30 knots late. A chance of
rain showers, possibly mixed with snow by mid afternoon. Waves
building to 3 to 6 feet occasionally to 8 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...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. A chance of snow showers, possibly
mixed with rain. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming southwest 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.

$$

LSZ265-252200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
959 AM EDT Wed Apr 25 2018

.REST OF TODAY...North winds 10 to 20 knots. Waves 2 to 4 feet
subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots becoming southwest 10 to
20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots veering northwest in
the afternoon, then increasing to 20 to 30 knots late. A chance
of rain showers, possibly mixed with snow by mid afternoon. Waves
building 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. A slight chance of rain and snow showers
through midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing east by mid
afternoon. A chance of rain and snow showers. Waves subsiding to
calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots becoming northwest
10 to 20 knots after midnight. Waves calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots becoming southwest 5 to
15 knots. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming southwest 15 to
25 knots. Waves building to 1 to 3 feet.

$$

LSZ266-252200-
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-
959 AM EDT Wed Apr 25 2018

.REST OF TODAY...North winds 10 to 20 knots becoming northwest
5 to 15 knots late. Waves 3 to 5 feet occasionally to 7 feet
subsiding to 1 to 3 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south after
midnight, then increasing to 10 to 20 knots late. Waves 1 to
3 feet.
.THURSDAY...South winds 10 to 20 knots veering southwest in the
afternoon, then becoming northwest 15 to 25 knots late. A slight
chance of rain showers, possibly mixed with snow by mid
afternoon. Waves building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A slight chance of rain and snow showers
through midnight. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 2 to 4 feet.
.FRIDAY...North winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots becoming west 5 to
15 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.SUNDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. Waves building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ267-252200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
959 AM EDT Wed Apr 25 2018

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

$$
LSZ261-252200-
MAFOR 2515/

Superior West 12510 12410 13520 11620. Waves 1 to 4 feet.

Superior North Central 11700 11610 12520 11510 13520. Waves 1 to 4
feet.

Superior South Central 12810 11100 11300 12410 12510. Waves 1 to
4 feet.

Superior East 11810 11720 11710 11610 12500 12410. Waves 1 to 4
feet.

$$

Ritzman

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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