Great Lakes Forecast
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FZUS63 KMQT 222015
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
415 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 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.

LSZ162-230415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
415 PM EDT Fri Sep 22 2017 /315 PM CDT Fri Sep 22 2017/

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Widespread
fog. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southwest late.
Patchy fog. A slight chance of showers and thunderstorms after
midnight. Waves building to 1 to 3 feet, then subsiding to calm
to 2 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.

$$

LSZ263-230415-
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-
415 PM EDT Fri Sep 22 2017

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Widespread fog.
Isolated showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight.
Patchy fog. A slight chance of showers and thunderstorms after
midnight. Waves building to 1 to 3 feet, then subsiding to calm
to 2 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.

$$

LSZ264-230415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
415 PM EDT Fri Sep 22 2017

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Widespread fog.
Isolated showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south late.
Widespread fog through midnight, then patchy fog after midnight.
A slight chance of showers and thunderstorms after midnight.
Waves 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.

$$

LSZ265-230415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
415 PM EDT Fri Sep 22 2017

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Patchy
fog. Isolated showers and thunderstorms. Waves 1 to 3 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south late.
Patchy fog. Waves subsiding to 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.

$$

LSZ266-230415-
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-
415 PM EDT Fri Sep 22 2017

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Patchy
fog. Isolated showers and thunderstorms. Waves 1 to 3 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to
20 knots late. Widespread fog through midnight. Patchy fog after
midnight. A slight chance of showers and thunderstorms. Waves
subsiding to calm to 2 feet, then 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.

$$

LSZ267-230415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
415 PM EDT Fri Sep 22 2017

.LATE THIS AFTERNOON...West winds 15 to 25 knots. Patchy fog.
Scattered showers and thunderstorms. Waves 2 to 4 feet subsiding
to 1 to 3 feet.
.TONIGHT...Southeast winds 5 to 15 knots becoming south 10 to
20 knots late. Patchy fog. Waves subsiding to 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.

$$

LSZ261-230415-
MAFOR 2221/
Superior West 11113 12210 11410 13510 11500. Patchy fog tonight.
Waves 1 to 3 feet.

Superior North Central 11103 11213 11323 11320 11410 13510. Waves
1 to 3 feet.

Superior South Central 11320 13310 14410. Patchy fog through
tonight. Scattered showers and thunderstorms early this evening.
Waves 1 to 3 feet.

Superior East 11430 12310 14410 11410. Scattered showers and
thunderstorms early this evening. Patchy fog through early
Saturday afternoon. 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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