Great Lakes Forecast
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FZUS63 KMQT 230145
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
945 PM EDT Fri Sep 22 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...Lake Superior will remain situated between a 30.1
inch ridge across the northern Ohio Valley and a 29.6 inch trough
over the Upper Mississippi Valley through Saturday. The trough
will stall just west of Lake Superior Sunday and Monday and weaken
to 29.9 inches. On Tuesday, the trough will push eastward across
Lake Superior. A 30.0 inch ridge will build in Wednesday.

LSZ162-230945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
945 PM EDT Fri Sep 22 2017 /845 PM CDT Fri Sep 22 2017/

.REST OF TONIGHT...East winds 5 to 15 knots veering south after
midnight, then veering southwest late. Patchy fog. Isolated
showers and thunderstorms after midnight. Waves calm to 2 feet
building to 1 to 3 feet.
.SATURDAY...Southwest winds 5 to 15 knots veering west late.
Patchy fog through early afternoon. A chance of showers and
thunderstorms. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering east late. A
chance of showers and thunderstorms. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. A slight chance of showers
and thunderstorms. Waves building to 1 to 3 feet, then subsiding
to calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. A chance of showers.
Areas of fog after midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Areas of fog. A chance of showers. Waves calm
to 2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots backing west after
midnight. Showers likely. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 2 to 4 feet.
.WEDNESDAY...West winds 10 to 20 knots veering northwest. Waves
subsiding to calm to 2 feet.

$$

LSZ263-230945-
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-
945 PM EDT Fri Sep 22 2017

.REST OF TONIGHT...East winds 5 to 15 knots veering south after
midnight, then becoming southwest 10 to 20 knots late. Patchy
fog. Isolated showers and thunderstorms after midnight. Waves
calm to 2 feet building to 1 to 3 feet.
.SATURDAY...Southwest winds 5 to 15 knots veering west late.
Patchy fog. A slight chance of showers and thunderstorms. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots veering northeast
after midnight, then veering east late. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. A slight chance of showers
and thunderstorms. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Areas of fog. Waves
calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east by mid
afternoon. Areas of fog. A chance of showers. Waves calm to
2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots backing north after
midnight. A chance of showers. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots increasing to 15 to 25 knots.
A chance of showers. Waves building to 3 to 5 feet occasionally
to 7 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-230945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
945 PM EDT Fri Sep 22 2017

.REST OF TONIGHT...East winds 5 to 15 knots veering south after
midnight. Widespread fog by late evening, then patchy fog after
midnight. Isolated showers and thunderstorms after midnight.
Waves calm to 2 feet building to 1 to 3 feet.
.SATURDAY...Southwest winds 5 to 15 knots veering west late.
Patchy fog. A slight chance of showers and thunderstorms. Waves
1 to 3 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering north after
midnight, then veering northeast late. A chance of showers and
thunderstorms. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering southeast by mid
afternoon. Patchy fog through early afternoon. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Areas of fog. Waves
calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east by mid
afternoon. Areas of fog. A chance of showers. Waves calm to
2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. A chance of showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots increasing to 15 to 25 knots.
A chance of showers. Waves building to 3 to 6 feet occasionally
to 8 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-230945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
945 PM EDT Fri Sep 22 2017

.REST OF TONIGHT...Southeast winds 10 to 20 knots becoming south
5 to 15 knots after midnight. Patchy fog. Waves calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots becoming south 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots veering south
after midnight. A slight chance of showers and thunderstorms
through midnight. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots. A chance of showers and
thunderstorms by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots. Waves subsiding to
calm to 2 feet.

$$

LSZ266-230945-
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-
945 PM EDT Fri Sep 22 2017

.REST OF TONIGHT...Southeast winds 10 to 20 knots veering south
after midnight, then diminishing to 5 to 15 knots late. Isolated
showers and thunderstorms by late evening. Widespread fog by late
evening. Patchy fog after midnight. Waves calm to 2 feet building
to 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots late. Patchy fog. A slight chance of showers and
thunderstorms by mid afternoon. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...Southwest winds 5 to 15 knots backing south
late. A slight chance of showers and thunderstorms. Waves calm to
2 feet.
.SUNDAY...South winds 10 to 20 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots. Waves building to
1 to 3 feet.
.MONDAY...South winds 10 to 20 knots. A chance of showers by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots. Waves subsiding to
1 to 3 feet.

$$

LSZ267-230945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
945 PM EDT Fri Sep 22 2017

.REST OF TONIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Isolated showers and thunderstorms by late
evening. Patchy fog. Waves calm to 2 feet.
.SATURDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then increasing to 10 to 20 knots
late. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots. Waves calm to
2 feet.
.SUNDAY...South winds 10 to 20 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY...South winds 10 to 20 knots. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots becoming northwest 15 to
25 knots. Waves building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of showers. Waves subsiding to 2 to 4 feet.

$$
LSZ261-230945-
MAFOR 2303/
Superior West 11310 11410 11520 12510 11500 11600 11800. Patchy
fog late this evening. Chance of showers and thunderstorms
Saturday evening. Waves 1 to 3 feet overnight and Saturday. Waves
1 foot or less Saturday evening.

Superior North Central 11313 12410 13510 11603 11610. Patchy fog
late overnight. Waves 1 to 3 feet.

Superior South Central 11310 14410 11410 11400 11100. Patchy fog
through early Saturday evening. Waves 2 feet or less.

Superior East 11310 14410 11410 11400 11510. Patchy fog through
early afternoon Saturday. Waves 1 to 3 feet.

$$

WFO MQT

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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