Great Lakes Forecast
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FZUS63 KMQT 240753
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
353 AM EDT Tue Apr 24 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 30.1 inch trough will move south from Upper
Michigan today as 30.4 inch high pressure builds into the
northern plains and northern Ontario. The high will reach the
western Great Lakes on Wednesday as it weakens to 30.2 inches. A
29.7 inch trough over northern Ontario Thursday will reach eastern
Ontario by Friday. A 29.7 inch low over southern Manitoba Friday
morning will dissipate over northern Illinois Saturday morning. A
30.2 inch high pressure ridge over northern Ontario Saturday
morning will move over the Great lakes Sunday.

LSZ162-241600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
353 AM EDT Tue Apr 24 2018 /253 AM CDT Tue Apr 24 2018/

.EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...North winds 5 to 15 knots becoming west less than
10 knots in the afternoon, then becoming northwest 5 to 15 knots
late. Waves calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...South winds less than 10 knots increasing to 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. Waves building to 1 to 3 feet.
.THURSDAY...Southwest winds 5 to 15 knots veering north by mid
afternoon. A chance of rain showers. Waves subsiding to calm to
2 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering north. Waves calm
to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-241600-
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-
353 AM EDT Tue Apr 24 2018

.EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...North winds 5 to 15 knots backing northwest in the
afternoon. Waves calm to 2 feet.
.TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves building to 1 to 3 feet.
.WEDNESDAY...North winds less than 10 knots becoming southwest
5 to 15 knots in the afternoon. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.WEDNESDAY NIGHT...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...Southwest winds 5 to 15 knots becoming north 10 to
20 knots by mid afternoon. A chance of rain showers. A chance of
snow showers by mid afternoon. Waves 1 to 3 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots veering north. Waves calm
to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering south. Waves calm
to 2 feet.

$$

LSZ264-241600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
353 AM EDT Tue Apr 24 2018

.EARLY THIS MORNING...North winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...North winds 10 to 20 knots backing northwest in the
afternoon. Waves building to 1 to 3 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...North winds 5 to 15 knots backing west in the
afternoon, then backing southwest late. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.WEDNESDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.THURSDAY...Southwest winds 10 to 20 knots veering north by mid
afternoon. A chance of rain showers. A chance of snow showers by
mid afternoon. Waves building to 2 to 4 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...Southeast winds 5 to 15 knots backing north. Waves
subsiding to calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering south. Waves calm
to 2 feet.

$$

LSZ265-241600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
353 AM EDT Tue Apr 24 2018

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...North winds 5 to 15 knots backing northwest in the
afternoon, then increasing to 10 to 20 knots late. A slight
chance of rain showers by mid afternoon. Waves calm to 2 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves building to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY...North winds 5 to 15 knots veering south late. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 10 to 20 knots veering north by mid
afternoon. A chance of rain showers by mid afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 2 to 4 feet.
.FRIDAY...East winds 5 to 15 knots backing north. Waves subsiding
to calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering south. Waves calm
to 2 feet.

$$

LSZ266-241600-
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-
353 AM EDT Tue Apr 24 2018

.EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...North winds 5 to 15 knots becoming northwest 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. A slight chance of rain showers by mid afternoon. Waves
building to 2 to 4 feet.
.TONIGHT...North winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.WEDNESDAY...North winds 5 to 15 knots backing west late. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...South winds 5 to 15 knots. Waves building to
1 to 3 feet.
.THURSDAY...Southwest winds 10 to 20 knots veering north by mid
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots after midnight. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.FRIDAY...North winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.SATURDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.

$$

LSZ267-241600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
353 AM EDT Tue Apr 24 2018

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots veering northwest in the
afternoon, then increasing to 10 to 20 knots late. A slight
chance of rain showers by mid afternoon. Waves building to 2 to
4 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north after
midnight. A slight chance of rain showers through midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest late.
Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.SATURDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ261-241600-
MAFOR 2409/
Superior West 11110 11810 11700 11600 11710 13810. Waves 2 feet
or less.

Superior North Central 12810 12710 11720 12830 11820. Waves 1 to
2 feet today. Waves 1 to 3 feet building to 3 to 5 feet tonight.

Superior South Central 11710 11810 12710 11720 12830 11820. Waves
1 to 3 feet today. Waves building to 3 to 6 feet tonight.

Superior East 11500 11700 11810 13720 12830. Waves 1 to 3 feet
today. Waves 2 to 4 feet building to 3 to 6 feet tonight.

$$

JLB

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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