Great Lakes Forecast
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FZUS63 KMQT 132002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 PM EDT Wed Sep 13 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 weak 29.7 inch trough over northern Minnesota will
move over Lake Superior Thursday evening as a 30.0 inch ridge
remains over far northern Ontario. A 29.5 inch low pressure over the
Plains Friday evening will move over the western Great Lakes
Saturday night and weaken to 29.8 inches over northern Ontario
Sunday night as a 30.1 inch high pressure moves into the Northern
Plains. This high will move over the Great Lakes on Monday.

LSZ162-140415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 PM EDT Wed Sep 13 2017 /302 PM CDT Wed Sep 13 2017/

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight, then veering east late. Patchy fog. A slight chance of
showers after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots late. Patchy fog through early afternoon. A chance of
showers and thunderstorms. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots veering east
after midnight. Showers likely and a chance of thunderstorms.
Waves 1 to 3 feet.
.FRIDAY...Northeast winds 10 to 20 knots. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves building
to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of showers. Waves subsiding to
1 to 3 feet.
.SATURDAY...East winds 10 to 20 knots becoming southeast 5 to
15 knots by mid afternoon. A chance of showers. Waves subsiding
to calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Showers likely through midnight. A chance of
thunderstorms. A chance of showers after midnight. Waves building
to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 5 to 15 knots.
Waves building to 2 to 4 feet, then subsiding to calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.

$$

LSZ263-140415-
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-
402 PM EDT Wed Sep 13 2017

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight, then veering east late. Patchy fog. A slight chance of
showers and thunderstorms after midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots. Showers likely
and a chance of thunderstorms. Waves 1 to 3 feet.
.FRIDAY...Northeast winds 10 to 20 knots. A chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves building
to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...Northeast winds 10 to 20 knots becoming east 5 to
15 knots after midnight. A chance of showers. Waves subsiding to
1 to 3 feet.
.SATURDAY...South winds 5 to 15 knots backing east by mid
afternoon. A chance of showers. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. A chance of showers through
midnight. A chance of thunderstorms. Showers likely after
midnight. Waves building to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 5 to 15 knots.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast. A chance
of showers. Waves calm to 2 feet.

$$

LSZ264-140415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
402 PM EDT Wed Sep 13 2017

.LATE THIS AFTERNOON...Southeast winds less than 10 knots. Waves
calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east after
midnight. A slight chance of showers and thunderstorms after
midnight. Waves calm to 2 feet.
.THURSDAY...East winds 5 to 15 knots. A chance of showers and
thunderstorms. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots. Showers likely
and a chance of thunderstorms. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers. A slight chance
of thunderstorms by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...East winds 10 to 20 knots becoming south 5 to
15 knots after midnight. A chance of showers. Waves subsiding to
1 to 3 feet.
.SATURDAY...Southeast winds 5 to 15 knots. A chance of showers.
Waves 1 to 3 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. A chance of showers through
midnight. A chance of thunderstorms. Showers likely after
midnight. Waves building to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 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.
.MONDAY...South winds 5 to 15 knots backing southeast. A chance
of showers. Waves calm to 2 feet.

$$

LSZ265-140415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 PM EDT Wed Sep 13 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight.
Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. A slight
chance of showers and thunderstorms by mid afternoon. Waves calm
to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. A chance of showers
and thunderstorms. Waves building to 1 to 3 feet, then subsiding
to calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. A chance of showers. A slight chance
of thunderstorms by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. A chance of showers.
Waves building to 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots. Waves 1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers through midnight. A
chance of thunderstorms. Showers likely after midnight. Waves
1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots veering south. Waves
calm to 2 feet.

$$

LSZ266-140415-
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-
402 PM EDT Wed Sep 13 2017

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots backing southeast late. A
slight chance of showers and thunderstorms. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. A chance of showers
and a slight chance of thunderstorms. Waves building to 1 to
3 feet.
.FRIDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. A chance of showers. A slight chance of thunderstorms
by mid afternoon. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SATURDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots. Showers likely
through midnight. A chance of thunderstorms. A chance of showers
after midnight. Waves building to 3 to 5 feet occasionally to
7 feet.
.SUNDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. A chance of showers. Waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.MONDAY...South winds 10 to 20 knots. Waves subsiding to calm to
2 feet.

$$

LSZ267-140415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
402 PM EDT Wed Sep 13 2017

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight, then increasing to 10 to 20 knots late. Patchy fog
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 10 to 20 knots backing southeast in the
afternoon, then veering south late. Patchy fog through early
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. A slight chance of
showers. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.FRIDAY...South winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. Waves building to
1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves 1 to 3 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots. A chance of
showers. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.SUNDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. A chance of showers. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.MONDAY...Northwest winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet.

$$

LSZ261-140415-
MAFOR 1321/
Superior West 12200 13210 12220 11210. Patchy fog tonight through
mid morning Thursday. Waves 3 feet or less.

Superior North Central 12300 11200 13210 12220. Chance of showers
Thursday afternoon. Waves 3 feet or less.

Superior South Central 11200 12310 11410 12400 11300 11310. Waves
1 foot or less.

Superior East 13300 12400 13300. Patchy fog late tonight through
mid morning Thursday. Waves 1 foot or less.

$$

RJT

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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