Great Lakes Forecast
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813
FZUS63 KMQT 181401
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 AM EDT Wed Apr 18 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 30.0 inches will move over Lake Superior
today after which a low of 29.5 inches will move from the mid
Mississippi Valley and through the Ohio Valley this afternoon. A
30.3 inch high will then move over the western Great Lakes on late
Thursday, building to 30.5 inches over Lake Superior on Friday
and remaining in place through the upcoming weekend.

LSZ162-182215-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 AM EDT Wed Apr 18 2018 /901 AM CDT Wed Apr 18 2018/

.REST OF TODAY...Northeast winds 15 to 25 knots. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to 1 to 3 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing southwest in
the afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds less than 10 knots. Waves calm to
2 feet.
.FRIDAY NIGHT...South winds less than 10 knots veering southwest
after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds less than 10 knots backing south.
Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots veering southwest. Waves
building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-182215-
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-
1001 AM EDT Wed Apr 18 2018

.REST OF TODAY...Northeast winds 15 to 25 knots. Waves 4 to
7 feet occasionally to 9 feet subsiding to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to 2 to 4 feet.
.THURSDAY...North winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds less than 10 knots. Waves calm to
2 feet.
.FRIDAY NIGHT...South winds less than 10 knots veering southwest
after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds less than 10 knots backing south.
Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-182215-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 AM EDT Wed Apr 18 2018

.REST OF TODAY...Northeast winds 20 to 30 knots backing north in
the afternoon. Waves 4 to 7 feet occasionally to 9 feet subsiding
to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon, then backing west late. Waves
subsiding to 2 to 4 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves building to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-182215-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 AM EDT Wed Apr 18 2018

.REST OF TODAY...Northeast winds 20 to 30 knots backing north in
the afternoon with a few gale force gusts to 35 knots. Waves 4 to
8 feet occasionally to 10 feet.
.TONIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves to 4 to 8 feet occasionally to 10 feet.
.THURSDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots late. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots veering south. Waves
calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming southwest 10 to
20 knots. Waves building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-182215-
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-
1001 AM EDT Wed Apr 18 2018

.REST OF TODAY...North winds 20 to 30 knots. Waves 4 to 8 feet
occasionally to 10 feet.
.TONIGHT...North winds 20 to 30 knots with a few gale force gusts
to 35 knots. Waves building to 5 to 8 feet occasionally to 10
feet.
.THURSDAY...North winds 15 to 25 knots backing northwest in the
afternoon. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...South winds 5 to 15 knots. 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.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-182215-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 AM EDT Wed Apr 18 2018

.REST OF TODAY...North winds 15 to 25 knots increasing to 20 to
30 knots with a few gale force gusts to 35 knots. Waves 3 to 6
feet occasionally to 8 feet subsiding to 2 to 4 feet.
.TONIGHT...North winds 20 to 30 knots with a few gale force gusts
to 35 knots. Waves building to 4 to 7 feet occasionally to 9
feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon. Waves 3 to 6 feet occasionally to
8 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. 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 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-182215-
MAFOR 1815/
Superior West 12140 11130 12830 11820 11810 11700. Waves 3 to 7
feet subsiding to 2 to 4 feet tonight. Waves 1 to 3 feet Thursday
morning.

Superior North Central 11130 11830 13840 11830 12820. Waves 3 to
7 feet subsiding to 3 to 5 feet Thursday morning.

Superior South Central 11130 14840 11840 12830. Waves 5 to 8
feet.

Superior East 13830 14840 11830. Waves 3 to 5 feet this
afternoon building to 4 to 7 feet tonight. Waves 3 to 6 feet
Thursday 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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