Great Lakes Forecast
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FZUS63 KMQT 240742
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
342 AM EDT Sun Sep 24 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 over the eastern Great Lakes and a 29.6 inch trough
over the Upper Mississippi Valley through Monday. The trough will
push eastward across Lake Superior on Tuesday. A 30.0 inch ridge
will build into the Upper Great Lakes on Wednesday into Thursday
before another low pressure trough of 29.9 inches crosses Lake
Superior Thursday afternoon.

LSZ162-241545-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
342 AM EDT Sun Sep 24 2017 /242 AM CDT Sun Sep 24 2017/

.EARLY THIS MORNING...East winds 5 to 15 knots. Patchy fog.
Isolated showers and thunderstorms. Waves calm to 2 feet.
.TODAY...East winds 5 to 15 knots. Isolated showers and
thunderstorms through early afternoon. Patchy fog. Waves calm to
2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight. Patchy fog. Scattered showers and thunderstorms. Waves
calm to 2 feet.
.MONDAY...West winds 5 to 15 knots veering north late. Patchy
fog. Scattered showers. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots. Showers likely.
Waves building to 2 to 4 feet.
.TUESDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Showers likely through early
afternoon, then a chance of showers by mid afternoon. Waves
subsiding to 1 to 3 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.
.THURSDAY...West winds 10 to 20 knots veering north. Waves calm
to 2 feet.

$$

LSZ263-241545-
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-
342 AM EDT Sun Sep 24 2017

.EARLY THIS MORNING...East winds 5 to 15 knots. Patchy fog.
Isolated showers and thunderstorms. Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots. Patchy fog through early
afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest late.
Patchy fog. Isolated showers and thunderstorms after midnight.
Waves building to 1 to 3 feet.
.MONDAY...West winds 5 to 15 knots veering north in the
afternoon. Patchy fog. Isolated thunderstorms through early
afternoon. Scattered showers. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots. A chance of
showers through midnight, then showers likely after midnight.
Waves building to 2 to 4 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Showers likely. Waves
subsiding to 1 to 3 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers. Waves building to
2 to 4 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots veering north. Waves calm to
2 feet.

$$

LSZ264-241545-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
342 AM EDT Sun Sep 24 2017

.EARLY THIS MORNING...East winds less than 10 knots. Areas of
fog. Isolated showers and thunderstorms. Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots. Patchy fog through early
afternoon. Isolated showers and thunderstorms through early
afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest late.
Patchy fog. Isolated showers and thunderstorms after midnight.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots veering northwest in the
afternoon, then veering north late. Patchy fog. Isolated
thunderstorms through early afternoon. Scattered showers. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots veering northeast after
midnight. A chance of showers through midnight, then showers
likely after midnight. Waves building to 2 to 4 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Showers likely. Waves
subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots becoming west
15 to 25 knots after midnight. A chance of showers. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots veering north. Waves
building to 1 to 3 feet.

$$

LSZ265-241545-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
342 AM EDT Sun Sep 24 2017

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Patchy fog.
Isolated showers and thunderstorms. Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots. Patchy fog through early
afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots veering north in the
afternoon. Patchy fog by mid afternoon. Scattered showers and
isolated thunderstorms by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...North winds 10 to 20 knots becoming northeast
5 to 15 knots after midnight. A chance of showers and a slight
chance of thunderstorms. Waves building to 1 to 3 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers through early
afternoon. Showers likely by mid afternoon. Waves subsiding to
calm to 2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots increasing to 20 to
30 knots after midnight. A chance of showers. Waves building to
2 to 4 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots veering north. A chance of
showers. Waves building to 1 to 3 feet.

$$

LSZ266-241545-
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-
342 AM EDT Sun Sep 24 2017

.EARLY THIS MORNING...South winds 5 to 15 knots. Patchy fog.
Isolated showers and thunderstorms. Waves calm to 2 feet.
.TODAY...South winds 10 to 20 knots. Patchy fog through early
afternoon. Waves building to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots. Waves building to 2 to
4 feet.
.MONDAY...South winds 10 to 20 knots veering southwest in the
afternoon, then veering north late. Scattered showers and
isolated thunderstorms. Patchy fog by mid afternoon. Waves
subsiding to calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots veering northeast after
midnight. A chance of showers and a slight chance of
thunderstorms. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.TUESDAY...East winds 5 to 15 knots backing northeast by mid
afternoon. A chance of showers through early afternoon. Showers
likely by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots becoming northwest
20 to 30 knots after midnight. Showers likely through midnight,
then a chance of showers after midnight. Waves building to 3 to
5 feet occasionally to 7 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 1 to 3 feet.
.THURSDAY...West winds 10 to 20 knots veering north. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ267-241545-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
342 AM EDT Sun Sep 24 2017

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Patchy fog through early afternoon. Waves calm
to 2 feet.
.TONIGHT...South winds 10 to 20 knots. Waves building to 1 to
3 feet.
.MONDAY...South winds 10 to 20 knots veering southwest in the
afternoon, then backing northeast late. Isolated showers by mid
afternoon. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. A slight chance of thunderstorms through midnight. A
chance of showers. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots veering south by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots becoming northwest
15 to 25 knots after midnight. Showers likely through midnight,
then a chance of showers after midnight. Waves building to 3 to
5 feet occasionally to 7 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 1 to 3 feet.
.THURSDAY...West winds 10 to 20 knots veering north. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ261-241545-
MAFOR 2409/
Superior West 11213 14300 12410 11510. Patchy fog today and this
evening. Waves 1 to 3 feet.

Superior North Central 11203 11303 12400 14410. Patchy fog. Waves
1 foot or less today. Waves 1 to 3 feet building to 2 to 4 feet
tonight.

Superior South Central 11300 11400 13410 12420 11410. Patchy fog
this morning. Waves 2 feet or less today. Waves 1 to 3 feet
tonight.

Superior East 11500 11400 13410 12420 11410. Patchy fog this
morning. Waves 2 feet or less today. Waves 1 to 2 feet building
to 2 to 4 feet tonight.

$$

JLB

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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