Great Lakes Forecast
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FZUS63 KMQT 221400
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM EDT Tue Aug 22 2017

For waters beyond five 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...Low pressure of 29.7 inches over eastern Lake
Superior will move to northern Quebec today. 30.2 inch high
pressure extending from Manitoba to Nebraska tonight will move
over Wisconsin Thursday morning and remain over the Great Lakes
through Friday and into Saturday.

LSZ162-222100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 AM EDT Tue Aug 22 2017 /900 AM CDT Tue Aug 22 2017/

.REST OF TODAY...West winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon, then diminishing to 15 to 25 knots
late. Isolated showers by mid afternoon. Waves 2 to 4 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north late.
Waves subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots in the afternoon, then backing west late. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-222100-
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-
1000 AM EDT Tue Aug 22 2017

.REST OF TODAY...West winds 15 to 25 knots. Isolated showers by
mid afternoon. Waves 2 to 4 feet building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north after
midnight, then diminishing to 10 to 20 knots late. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest in the
afternoon, then becoming west 5 to 15 knots late. Waves subsiding
to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots becoming northeast less
than 10 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots becoming south
less than 10 knots after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-222100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 AM EDT Tue Aug 22 2017

.REST OF TODAY...Northwest winds 15 to 25 knots becoming west
20 to 30 knots in the afternoon, then diminishing to 15 to
25 knots late. Isolated showers by mid afternoon. Waves 1 to
3 feet building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Northwest winds 15 to 25 knots veering north after
midnight. Isolated showers through midnight. Waves building to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots backing northwest
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots becoming northwest less
than 10 knots by mid afternoon. Waves 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...West winds less than 10 knots backing southeast. Waves
calm to 2 feet.
.SATURDAY...Southeast winds less than 10 knots increasing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ265-222100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 AM EDT Tue Aug 22 2017

.REST OF TODAY...Northwest winds 20 to 30 knots becoming west
in the afternoon. Waves 1 to 3 feet building to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves subsiding to 2 to 4 feet, then building to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Waves subsiding to 2 to 4 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.
.SATURDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ266-222100-
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-
1000 AM EDT Tue Aug 22 2017

.REST OF TODAY...Northwest winds 20 to 30 knots becoming west
in the afternoon. Isolated showers by mid afternoon. Waves 2 to 4
feet building to 4 to 7 feet occasionally to 9 feet.
.TONIGHT...Northwest winds 20 to 30 knots. Waves subsiding to
3 to 6 feet occasionally to 8 feet, then building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.FRIDAY...West winds 5 to 15 knots backing south. Waves calm to
2 feet.
.SATURDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-222100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 AM EDT Tue Aug 22 2017

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

$$
LSZ261-222100-
MAFOR 2215/
Superior West 13630 12730 13820. Waves 1 to 4 feet.

Superior North Central 11740 11640 11630 11730 11740 13730. Waves
2 to 6 feet.

Superior South Central 11740 12640 12740 13730. Waves 3 to 7 feet.

Superior East 11740 12640 11740 14730. Waves 3 to 8 feet.

$$

MZ

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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