Great Lakes Forecast
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FZUS63 KMQT 152013
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
413 PM EDT Fri Sep 15 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 29.9 inch low pressure trough from the central Plains
to Lake Superior will remain nearly stationary through Saturday. Low
pressure of 29.8 inches over northern Minnesota Sunday morning will
move over northern Ontario Sunday evening and send a cold front
across Lake Superior. High pressure of 30.1 inches over the western
Great Lakes Monday morning will reach James Bay Wednesday morning as
a 29.4 inch trough moves into the northern Plains.

LSZ162-160415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
413 PM EDT Fri Sep 15 2017 /313 PM CDT Fri Sep 15 2017/

.LATE THIS AFTERNOON...Northeast winds 20 to to 30 knots with a
few gale force gusts to 35 knots. Patchy fog. Scattered showers
and isolated thunderstorms. Waves 5 to 9 feet occasionally to 11
feet.
.TONIGHT...East winds 20 to 30 knots diminishing to 10 to
20 knots. Patchy fog. Scattered showers and thunderstorms. Waves
building to 8 to 11 feet occasionally to 14 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...East winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Patchy fog through early afternoon. A
chance of showers through early afternoon. A chance of
thunderstorms. Showers likely by mid afternoon. Waves subsiding
to calm to 2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots becoming west 15 to
25 knots late. Showers likely and a chance of thunderstorms.
Waves building to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots becoming southwest
10 to 20 knots. A chance of showers. Waves building to 2 to
4 feet, then subsiding to calm to 2 feet.

$$

LSZ263-160415-
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-
413 PM EDT Fri Sep 15 2017

.LATE THIS AFTERNOON...Northeast winds 20 to 30 knots, with a few
gale force gusts to 35 knots. Patchy fog. Isolated showers and
thunderstorms. Waves 4 to 7 feet occasionally to 9 feet building
to 6 to 9 feet occasionally to 11 feet.
.TONIGHT...Northeast winds 20 to 30 knots becoming east 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
Patchy fog. Isolated showers and thunderstorms. Waves building to
7 to 10 feet occasionally to 13 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering south in the
afternoon, then backing northeast late. A chance of showers and
thunderstorms. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots becoming south 10 to
20 knots after midnight, then becoming southwest 15 to 25 knots
late. Showers likely and a chance of thunderstorms. Waves
building to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots. A slight chance of showers
through early afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering southwest. A
chance of showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 1 to 3 feet.

$$

LSZ264-160415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
413 PM EDT Fri Sep 15 2017

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. Isolated
showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Northeast winds 15 to 25 knots veering east after
midnight, then becoming southeast 10 to 20 knots late. Patchy
fog. Isolated showers and thunderstorms. Waves building to 6 to
9 feet occasionally to 11 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...South winds 10 to 20 knots becoming southeast 5 to
15 knots in the afternoon, then backing east late. A chance of
showers. A chance of thunderstorms by mid afternoon. Waves
subsiding to 1 to 3 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering south after
midnight, then increasing to 10 to 20 knots late. Showers likely
and a chance of thunderstorms. Waves building to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots. A chance of showers through
early afternoon. Waves subsiding to 1 to 3 feet, then building to
3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...East winds 5 to 15 knots veering southeast. Waves
building to 1 to 3 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots veering south. A
chance of showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.

$$

LSZ265-160415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
413 PM EDT Fri Sep 15 2017

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. Isolated
showers and thunderstorms. Waves calm to 2 feet building to 1 to
3 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering southeast after
midnight, then becoming south 10 to 20 knots late. Patchy fog.
Isolated thunderstorms through midnight. Isolated showers. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots becoming southeast 5 to
15 knots in the afternoon. A slight chance of showers. A slight
chance of thunderstorms by mid afternoon. Waves subsiding to 1 to
3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots late. 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. A chance of showers through
early afternoon. Waves 1 to 3 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots veering northwest after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.TUESDAY...East winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots veering south. A
chance of showers. Waves building to 2 to 4 feet, then subsiding
to 1 to 3 feet.

$$

LSZ266-160415-
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-
413 PM EDT Fri Sep 15 2017

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. Patchy
fog. Isolated showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...East winds 15 to 25 knots becoming southeast 10 to
20 knots after midnight, then becoming south 15 to 25 knots late.
Patchy fog through midnight. Isolated showers and thunderstorms.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots late. A slight chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers and a slight chance
of thunderstorms. Waves building to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots. A slight chance of
thunderstorms through early afternoon. A chance of showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots. Waves calm to
2 feet.
.TUESDAY...East winds 10 to 20 knots veering southeast. Waves
building to 1 to 3 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.

$$

LSZ267-160415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
413 PM EDT Fri Sep 15 2017

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Patchy fog.
Isolated showers. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to
25 knots late. Patchy fog through midnight. Isolated showers.
Waves building to 2 to 4 feet.
.SATURDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots. A slight chance of
showers and thunderstorms after midnight. Waves 1 to 3 feet.
.SUNDAY...South winds 15 to 25 knots veering northwest by mid
afternoon. Showers likely through early afternoon. A slight
chance of thunderstorms. A chance of showers by mid afternoon.
Waves building to 2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...North winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.

$$

LSZ261-160415-
MAFOR 1521/
Superior West 12140 11240 11230 11220 13210. Patchy fog late in
the morning. A chance of showers and thunderstorms. Waves 6 to 10
feet building to 8 to 11 feet...then subsiding to 5 to 8 feet
overnight. Waves 4 to 7 feet subsiding to 2 to 3 feet Saturday.

Superior North Central 11130 11140 11240 11330 12320 12310.
Patchy fog tonight. Chance of showers late Saturday. Waves 3 to 5
feet building to 5 to 9 feet tonight. Waves 4 to 6 feet subsiding
to 1 to 3 feet Saturday.

Superior South Central 11120 11220 12320 12420 12320. Waves 1 to
3 feet building to 3 to 5 feet tonight. Waves 2 to 4 feet
subsiding to 1 to 3 feet Saturday.

Superior East 11220 11230 12320 14420. Scattered showers after
midnight tonight. Waves 1 to 3 feet building to 2 to 5 feet
tonight. Waves 2 to 4 feet Saturday.

$$

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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