Great Lakes Forecast
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914
FZUS63 KMQT 170210
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1010 PM EDT Sat Sep 16 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 low pressure trough averaging 29.9 inches extending
from western Lake Superior to the central Plains will move
eastward tonight through Sunday afternoon. High pressure of 30.1
inches will move from the central Plains Sunday to Quebec Tuesday,
crossing Lake Superior Monday morning. A 29.7 inch trough will
then move eastward across Lake Superior on Wednesday. A 30.0 inch
high will follow across the region Wednesday night into Thursday.

LSZ162-171015-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1010 PM EDT Sat Sep 16 2017 /910 PM CDT Sat Sep 16 2017/

.REST OF TONIGHT...East winds 10 to 20 knots veering southwest
after midnight, then becoming west 15 to 25 knots late. Showers
and thunderstorms by late evening, then a chance of showers and
thunderstorms after midnight. Waves calm to 2 feet building to
3 to 5 feet occasionally to 7 feet.
.SUNDAY...West winds 20 to 30 knots diminishing to 15 to 25 knots
late. Waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 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. A slight chance of showers
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots. A chance of showers
after midnight. Waves 1 to 3 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots becoming west 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.
.THURSDAY...East winds 10 to 20 knots veering southeast. A chance
of showers. Waves calm to 2 feet.

$$

LSZ263-171015-
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-
1010 PM EDT Sat Sep 16 2017

.REST OF TONIGHT...East winds 5 to 15 knots veering south after
midnight, then becoming southwest 15 to 25 knots late.
Thunderstorms likely by late evening. Showers likely. A chance of
thunderstorms after midnight. Waves calm to 2 feet building to
3 to 5 feet occasionally to 7 feet.
.SUNDAY...West winds 20 to 30 knots diminishing to 15 to 25 knots
late. A slight chance of showers through early afternoon. Waves
building to 4 to 8 feet occasionally to 10 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. A slight chance of showers
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots. A slight chance of
showers through midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots becoming west 10 to
20 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 1 to 3 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast. A chance
of showers. Waves subsiding to calm to 2 feet.

$$

LSZ264-171015-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1010 PM EDT Sat Sep 16 2017

.REST OF TONIGHT...East winds 10 to 20 knots veering southeast
after midnight, then veering southwest late. Thunderstorms likely
by late evening. Showers likely. A chance of thunderstorms after
midnight. Waves 1 to 3 feet building to 2 to 4 feet.
.SUNDAY...West winds 20 to 30 knots. A chance of showers and a
slight chance of thunderstorms through early afternoon. Waves
building to 4 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...West winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots. A slight chance of
showers through midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots veering west. A
chance of showers. Waves building to 5 to 8 feet occasionally to
10 feet, then subsiding to 1 to 3 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast. Waves
subsiding to calm to 2 feet.

$$

LSZ265-171015-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1010 PM EDT Sat Sep 16 2017

.REST OF TONIGHT...Southeast winds 10 to 20 knots becoming south
15 to 25 knots after midnight, then becoming southwest 10 to
20 knots late. A chance of showers by late evening. A chance of
thunderstorms. Showers likely after midnight. Waves 2 to 4 feet
subsiding to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon. A chance of showers and a slight chance of
thunderstorms through early afternoon. Waves building to 3 to
5 feet occasionally to 7 feet.
.SUNDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then veering northwest late. Waves
subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. A slight chance of showers by mid afternoon. Waves
calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots. A chance of
showers through midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. Waves building to 1 to 3 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots becoming west 10 to
20 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to calm to 2 feet.
.THURSDAY...East winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ266-171015-
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-
1010 PM EDT Sat Sep 16 2017

.REST OF TONIGHT...South winds 15 to 25 knots. A slight chance of
showers by late evening. A chance of thunderstorms. Showers
likely after midnight. Waves 3 to 5 feet occasionally to 7 feet
subsiding to 2 to 4 feet.
.SUNDAY...West winds 20 to 30 knots. A chance of showers and a
slight chance of thunderstorms through early afternoon. Waves
building to 4 to 8 feet occasionally to 10 feet.
.SUNDAY NIGHT...West winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...South winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots becoming southeast 10 to
20 knots after midnight. A chance of showers. Waves calm to
2 feet.
.TUESDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southeast winds 20 to 30 knots becoming west 10 to
20 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots veering southeast. Waves
subsiding to calm to 2 feet.

$$

LSZ267-171015-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1010 PM EDT Sat Sep 16 2017

.REST OF TONIGHT...South winds 15 to 25 knots. A chance of
showers and a slight chance of thunderstorms. Waves 3 to 5 feet
occasionally to 7 feet subsiding to 2 to 4 feet.
.SUNDAY...South winds 15 to 25 knots veering west in the
afternoon, then veering northwest late. Showers likely and a
slight chance of thunderstorms through early afternoon, then a
chance of showers by mid afternoon. 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 2 to 4 feet.
.MONDAY...North winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots becoming east 10 to
20 knots after midnight. A chance of showers. Waves calm to
2 feet.
.TUESDAY...East winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots veering southeast
after midnight. Waves building to 1 to 3 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots. A chance of showers.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.THURSDAY...North winds 10 to 20 knots veering southeast. Waves
subsiding to calm to 2 feet.

$$

LSZ261-171015-
MAFOR 1703/
Superior West 11319 11536 11630 13640 11630 11620. Chance of
showers and thunderstorms late overnight. Waves 2 to 6 feet.

Superior North Central 11329 11416 11526 14640 11630. Chance of
thunderstorms late overnight through mid Sunday morning...Then
chance of showers late Sunday morning. Waves 1 to 4 feet
building to 5 to 8 feet Sunday and Sunday evening.

Superior South Central 11430 11436 11426 11530 12640 12630.
Chance of showers and thunderstorms after midnight through mid
Sunday morning...Then chance of showers late Sunday morning.
Waves 1 to 4 feet overnight building to 3 to 6 feet Sunday and
Sunday evening.

Superior East 12430 11420 11526 12630 12730. Chance of showers
and thunderstorms late overnight through mid Sunday morning.
Chance of showers early Sunday afternoon. Waves 2 to 5 feet
building to 4 to 7 feet Sunday and Sunday evening.

$$

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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