Great Lakes Forecast
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FZUS63 KMQT 162003
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
403 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.

LSZ162-170415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
403 PM EDT Sat Sep 16 2017 /303 PM CDT Sat Sep 16 2017/

.LATE THIS AFTERNOON...East winds 10 to 20 knots. A chance of
showers and thunderstorms. Waves 1 to 3 feet.
.TONIGHT...East winds 10 to 20 knots veering southwest after
midnight, then becoming west 15 to 25 knots late. Showers with
thunderstorms likely through midnight, then a chance of showers
and thunderstorms after midnight. Waves subsiding to calm to
2 feet, then 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.

$$

LSZ263-170415-
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-
403 PM EDT Sat Sep 16 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. A chance of
showers and thunderstorms. Waves 1 to 3 feet subsiding to calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight,
then becoming southwest 15 to 25 knots late. Thunderstorms likely
through midnight. Showers likely. A chance of thunderstorms after
midnight. Waves 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. 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.

$$

LSZ264-170415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
403 PM EDT Sat Sep 16 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. A chance of
showers and thunderstorms. Waves 2 to 4 feet subsiding to 1 to
3 feet.
.TONIGHT...East winds 10 to 20 knots veering southeast after
midnight, then veering southwest late. Showers likely and a
chance of thunderstorms. Waves 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. 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.

$$

LSZ265-170415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
403 PM EDT Sat Sep 16 2017

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. A slight
chance of showers and thunderstorms. Waves 1 to 3 feet.
.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 through midnight. A chance of
thunderstorms. Showers likely after midnight. Waves building to
2 to 4 feet, then 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.

$$

LSZ266-170415-
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-
403 PM EDT Sat Sep 16 2017

.LATE THIS AFTERNOON...South winds 10 to 20 knots. A slight
chance of showers and thunderstorms. Waves 2 to 4 feet.
.TONIGHT...South winds 15 to 25 knots. A slight chance of showers
through midnight. A chance of thunderstorms. Showers likely after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet,
then 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.

$$

LSZ267-170415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
403 PM EDT Sat Sep 16 2017

.LATE THIS AFTERNOON...South winds 15 to 25 knots. Waves 2 to
4 feet.
.TONIGHT...South winds 15 to 25 knots. A chance of showers and a
slight chance of thunderstorms. Waves building to 3 to 5 feet
occasionally to 7 feet, then 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.

$$

LSZ261-170415-
MAFOR 1621/
Superior West 11210 11219 11316 11536 11630 13640. Chance of
thunderstorms after midnight. Chance of showers and thunderstorms
late tonight. Waves 2 to 6 feet.

Superior North Central 11310 11210 11326 11416 11526 13640.
Chance of showers and thunderstorms through mid Sunday
morning...Then chance of showers late Sunday morning. Waves 1 to
4 feet building to 5 to 8 feet Sunday.

Superior South Central 11320 12430 11436 11426 11530 12640.
Chance of showers and thunderstorms after midnight through mid
Sunday morning. Chance of showers late Sunday morning. Waves 1 to
4 feet tonight building to 4 to 6 feet Sunday.

Superior East 11420 13430 11420 11526 12630. Chance of showers
and thunderstorms late tonight through mid Sunday morning. Chance
of showers early Sunday afternoon. Waves 2 to 6 feet.

$$

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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