Great Lakes Forecast
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FZUS63 KMQT 141937
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
337 PM EDT Mon Aug 14 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...A pair of low pressure systems of 29.7 inches over
northern Ontario and northeastern Iowa will move east tonight as
high pressure of 30.0 inches builds into northwestern Ontario. The
high will then settle over the Upper Great Lakes on Tuesday. As
the high shifts east Tuesday night and Wednesday, low pressure of
29.7 inches will organize over the Central Plains. The low will
track northeast across the Upper Great Lakes on Thursday and reach
the Lower Great Lakes on Friday. In its wake, high pressure of
30.0 inches will shift east to the western Great Lakes and expand
over the Great Lakes region Saturday.

LSZ162-150345-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
337 PM EDT Mon Aug 14 2017 /237 PM CDT Mon Aug 14 2017/

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Isolated
showers. Waves calm to 2 feet.
.TONIGHT...Southwest winds less than 10 knots becoming west 5 to
15 knots late. Widespread fog after midnight. Waves calm to
2 feet.
.TUESDAY...Northeast winds less than 10 knots becoming east 5 to
15 knots in the afternoon. Widespread fog through early
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots. A slight chance of
showers after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers. Waves building to
2 to 4 feet.
.WEDNESDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.THURSDAY...Northeast winds 10 to 20 knots becoming north 15 to
25 knots by mid afternoon. Showers likely through early
afternoon, then a chance of showers by mid afternoon. Waves 2 to
4 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...West winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.

$$

LSZ263-150345-
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-
337 PM EDT Mon Aug 14 2017

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Scattered
showers. Waves calm to 2 feet.
.TONIGHT...Southwest winds less than 10 knots veering west after
midnight, then increasing to 5 to 15 knots late. Isolated showers
through midnight. Widespread fog after midnight. Waves calm to
2 feet.
.TUESDAY...Northeast winds 5 to 15 knots becoming east less than
10 knots in the afternoon, then increasing to 5 to 15 knots late.
Patchy fog through early afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers. Waves building to
1 to 3 feet.
.WEDNESDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of showers through midnight.
Showers after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.THURSDAY...East winds 15 to 25 knots backing northeast by mid
afternoon. Showers likely through early afternoon, then a chance
of showers by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots. A chance of
showers. Waves subsiding to 1 to 3 feet.
.FRIDAY...West winds 5 to 15 knots backing southwest. Waves
subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.

$$

LSZ264-150345-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
337 PM EDT Mon Aug 14 2017

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Isolated
showers. Waves calm to 2 feet.
.TONIGHT...Southwest winds less than 10 knots veering west after
midnight, then becoming north 5 to 15 knots late. Waves calm to
2 feet.
.TUESDAY...North winds 5 to 15 knots veering northeast in the
afternoon, then becoming east less than 10 knots late. Waves calm
to 2 feet.
.TUESDAY NIGHT...East winds less than 10 knots veering southeast
after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers through midnight.
Showers likely after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...East winds 15 to 25 knots. Showers. Waves building to
3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. A chance of showers. Waves subsiding to 2 to
4 feet.
.FRIDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.

$$

LSZ265-150345-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
337 PM EDT Mon Aug 14 2017

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Isolated
showers. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots. Isolated showers through
midnight. Patchy fog after midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots veering northeast late.
Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 15 to 25 knots veering southeast
after midnight. Showers likely after midnight. Waves building to
2 to 4 feet.
.THURSDAY...Southeast winds 15 to 25 knots backing east by mid
afternoon. Showers likely. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots becoming northwest
15 to 25 knots after midnight. A chance of showers. Waves
subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 10 to 20 knots backing west. Waves
subsiding to calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots backing southwest. Waves
calm to 2 feet.

$$

LSZ266-150345-
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-
337 PM EDT Mon Aug 14 2017

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Northwest winds 5 to 15 knots. Isolated showers
through midnight. Patchy fog after midnight. Waves calm to
2 feet.
.TUESDAY...Northwest winds 10 to 20 knots becoming north 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots veering east late.
Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. A chance of showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Southeast winds 15 to 25 knots backing east by mid
afternoon. Showers. Waves building to 3 to 6 feet occasionally to
8 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots becoming north
15 to 25 knots after midnight. A chance of showers. Waves
subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.

$$

LSZ267-150345-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
337 PM EDT Mon Aug 14 2017

.TONIGHT...North winds 5 to 15 knots backing northwest after
midnight. Patchy fog after midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight, then veering east late. Waves calm
to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Southeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 2 to 4 feet.
.THURSDAY...Southeast winds 20 to 30 knots. Showers likely. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.THURSDAY NIGHT...Southeast winds 15 to 25 knots backing east
after midnight. A chance of showers. Waves subsiding to 1 to
3 feet.
.FRIDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming southwest
5 to 15 knots. Waves calm to 2 feet.

$$

LSZ261-150345-
MAFOR 1421/
Superior West 11300 12500 11603 11703 11803 12200. Scattered
showers early this evening. Patchy fog late Tuesday morning.
Waves 1 foot or less.

Superior North Central 12500 12600 11700 11800 12100. Waves 1
foot or less.

Superior South Central 11800 12600 13700 12800. Patchy fog late
tonight. Patchy fog through mid morning Tuesday. Waves 1 foot or
less.

Superior East 11800 14700 11700 12800. Patchy fog late tonight.
Patchy fog through mid morning Tuesday. Waves 1 foot or less.

$$

07

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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