Great Lakes Forecast
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FZUS63 KMQT 161400
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 AM 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 the northern Plains through western Lake Superior will
remain nearly stationary through today. Low pressure of 29.7
inches over the central Plains will lift northeast through
Minnesota into Ontario by Sunday evening, sending a cold front
across Lake Superior. High pressure of 30.1 inches will move over
the western Great Lakes by Monday morning and will reach James Bay
by Wednesday morning as a 29.5 inch trough moves into the
northern Plains. This trough will weaken to around 29.7 inches as
it moves across the Upper Great Lakes late Wednesday into
Thursday.

LSZ162-162200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 AM EDT Sat Sep 16 2017 /900 AM CDT Sat Sep 16 2017/

.REST OF TODAY...East winds 10 to 20 knots becoming northeast
5 to 15 knots late. Patchy fog. A chance of showers and
thunderstorms. Waves 3 to 6 feet occasionally to 8 feet subsiding
to 2 to 4 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then becoming west 15 to 25 knots late. Areas of
fog. Showers with thunderstorms likely through midnight. A chance
of showers and thunderstorms after midnight. Waves subsiding to
1 to 3 feet, then building to 2 to 4 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.
.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. 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 becoming southeast 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots becoming south 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet.

$$

LSZ263-162200-
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-
1000 AM EDT Sat Sep 16 2017

.REST OF TODAY...Northeast winds 10 to 20 knots diminishing to 5
to 15 knots in the afternoon. Patchy fog. A slight chance of
showers and thunderstorms. Waves 3 to 6 feet occasionally to 8
feet subsiding to 1 to 3 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight,
then becoming southwest 15 to 25 knots late. Patchy fog. Showers
and thunderstorms likely. Waves building to 2 to 4 feet.
.SUNDAY...West winds 20 to 30 knots. 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...Southwest winds 5 to 15 knots backing south by mid
afternoon. 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...East winds 5 to 15 knots becoming southeast 10 to
20 knots. A chance of showers. Waves building to 2 to 4 feet.
.WEDNESDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 1 to 3 feet.

$$

LSZ264-162200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 AM EDT Sat Sep 16 2017

.REST OF TODAY...Southeast winds 10 to 20 knots diminishing to 5
to 15 knots in the afternoon. Patchy fog. A slight chance of
showers and thunderstorms. Waves 3 to 6 feet occasionally to 8
feet subsiding to 1 to 3 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight,
then increasing to 15 to 25 knots late. Areas of fog. A chance of
showers and thunderstorms through midnight. Showers and
thunderstorms likely after midnight. Waves 1 to 3 feet.
.SUNDAY...West winds 20 to 30 knots. A chance of showers and a
slight chance of thunderstorms through early afternoon. Waves
building to 5 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...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves building to 2 to 4 feet.
.WEDNESDAY...Southeast winds 15 to 25 knots becoming south 10 to
20 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ265-162200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 AM EDT Sat Sep 16 2017

.REST OF TODAY...South winds 10 to 20 knots diminishing to 5 to
15 knots late. A slight chance of showers. Waves 2 to 4 feet.
.TONIGHT...South winds 10 to 20 knots. A slight chance of showers
through midnight. Showers likely after midnight. A chance of
thunderstorms. Waves subsiding to calm to 2 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 becoming northwest
10 to 20 knots 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
building to 1 to 3 feet.
.WEDNESDAY...Southeast winds 15 to 25 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.

$$

LSZ266-162200-
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-
1000 AM EDT Sat Sep 16 2017

.REST OF TODAY...South winds 15 to 25 knots diminishing to 10 to
20 knots late. Patchy fog by mid afternoon. A slight chance of
showers by mid afternoon. Waves 3 to 5 feet occasionally to
7 feet subsiding to 2 to 4 feet.
.TONIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Patchy fog. A chance of showers and
thunderstorms. Waves 2 to 4 feet.
.SUNDAY...Southwest winds 20 to 30 knots veering west in the
afternoon. Showers likely and a slight chance of thunderstorms
through early afternoon. A slight chance of showers by mid
afternoon. Waves building to 5 to 8 feet occasionally to 10 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...Southwest winds 5 to 15 knots backing south by mid
afternoon. Waves subsiding to 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 veering south. A
chance of showers. Waves building to 3 to 6 feet occasionally to
8 feet.

$$

LSZ267-162200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 AM EDT Sat Sep 16 2017

.REST OF TODAY...South winds 15 to 25 knots. Waves 3 to 5 feet
occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...South winds 15 to 25 knots. A chance of showers and
thunderstorms after midnight. Waves 2 to 4 feet.
.SUNDAY...South winds 15 to 25 knots veering west in the
afternoon, then veering northwest late. Showers likely through
early afternoon. A chance of thunderstorms. A chance of showers
by mid afternoon. Waves subsiding to 1 to 3 feet, then 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. 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. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.

$$
LSZ261-162200-
MAFOR 1615/
Superior West 11220 11210 11100 12219 11429 12640. Patchy fog
late this morning. Patchy fog tonight. Chance of thunderstorms
through early evening. Chance of showers and thunderstorms late
tonight. Waves 2 to 6 feet.

Superior North Central 11320 12310 11210 11310 11419 11426 11540.
Patchy fog overnight. Chance of showers and thunderstorms this
evening. Chance of showers and thunderstorms Sunday morning.
Waves 1 to 5 feet.

Superior South Central 13420 13430 11426 11530. Patchy fog late.
Chance of thunderstorms late tonight. Chance of thunderstorms
through mid morning...Then chance of showers late Sunday morning.
Waves 1 to 5 feet.

Superior East 11430 12420 14430 11526. Chance of showers and
thunderstorms late tonight and Sunday morning. Waves 2 to 5 feet.

$$

Kluber

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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