Great Lakes Forecast
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FZUS63 KMQT 230740
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
340 AM EDT Sat Sep 23 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 this afternoon. 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.

LSZ162-231545-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
340 AM EDT Sat Sep 23 2017 /240 AM CDT Sat Sep 23 2017/

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Isolated
showers and thunderstorms. Waves 1 to 3 feet.
.TODAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then veering west late. Scattered
showers and thunderstorms by mid afternoon. Waves subsiding to
calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Patchy fog. Scattered showers and thunderstorms. Waves
calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of showers and a slight chance of
thunderstorms. Areas of fog after midnight. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots veering northwest by mid
afternoon. Areas of fog. A chance of showers. Waves calm to
2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of showers. Waves calm to
2 feet.
.TUESDAY...Northeast winds 10 to 20 knots backing north. A chance
of showers. Waves building to 2 to 4 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.

$$

LSZ263-231545-
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-
340 AM EDT Sat Sep 23 2017

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Isolated
showers and thunderstorms. Waves 1 to 3 feet.
.TODAY...Southwest winds 5 to 15 knots veering west late.
Isolated showers and thunderstorms by mid afternoon. Waves
subsiding to calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering east after
midnight. Scattered showers and thunderstorms. Patchy fog after
midnight. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering south in the
afternoon. A slight chance of showers and thunderstorms through
early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Areas of fog. A slight chance of showers and
thunderstorms after midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering northwest by mid
afternoon. Areas of fog. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots veering northeast after
midnight. A chance of showers. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots backing north. A chance
of showers. Waves building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-231545-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
340 AM EDT Sat Sep 23 2017

.EARLY THIS MORNING...South winds 5 to 15 knots. Isolated showers
and thunderstorms. Waves 1 to 3 feet.
.TODAY...Southwest winds 5 to 15 knots veering west late. Patchy
fog by mid afternoon. Waves 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots veering north after midnight,
then veering northeast late. Patchy fog. Scattered showers and
thunderstorms. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering south in the
afternoon. Patchy fog through early afternoon. A slight chance of
showers and thunderstorms through early afternoon. Waves calm to
2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Areas of fog. A slight
chance of showers after midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering northwest by mid
afternoon. Areas of fog. A chance of showers. Waves 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 1 to 3 feet, then
subsiding to calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots backing north. A chance
of showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.

$$

LSZ265-231545-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
340 AM EDT Sat Sep 23 2017

.EARLY THIS MORNING...South winds 5 to 15 knots. Isolated showers
and thunderstorms. Waves calm to 2 feet.
.TODAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight. Isolated showers and thunderstorms after midnight.
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...Southwest winds 10 to 20 knots veering north by mid
afternoon. A chance of showers and thunderstorms by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...North winds 10 to 20 knots. Showers likely
through midnight. A chance of thunderstorms. A chance of showers
after midnight. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots backing northwest. A
chance of showers. Waves building to 3 to 5 feet occasionally to
7 feet.
.WEDNESDAY...West winds 15 to 25 knots. Waves subsiding to calm
to 2 feet.

$$

LSZ266-231545-
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-
340 AM EDT Sat Sep 23 2017

.EARLY THIS MORNING...South winds 10 to 20 knots. Isolated
showers and thunderstorms. Waves 1 to 3 feet.
.TODAY...South winds 10 to 20 knots veering southwest in the
afternoon, then diminishing to 5 to 15 knots late. Waves
subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south late.
Isolated showers and thunderstorms after midnight. Waves calm to
2 feet.
.SUNDAY...South winds 10 to 20 knots. A slight chance of showers
through early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots veering southwest by mid
afternoon. A chance of showers by mid afternoon. Waves calm to
2 feet.
.MONDAY NIGHT...North winds 10 to 20 knots. A chance of showers
and thunderstorms. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots backing northwest. A
chance of showers. Waves building to 4 to 7 feet occasionally to
9 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots backing west. Waves
subsiding to 1 to 3 feet.

$$

LSZ267-231545-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
340 AM EDT Sat Sep 23 2017

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...South winds 10 to 20 knots becoming southwest 5 to
15 knots in the afternoon, then backing south late. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots late. 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 veering southwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.TUESDAY...North winds 10 to 20 knots veering south. 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
2 to 4 feet.

$$

LSZ261-231545-
MAFOR 2309/
Superior West 12520 11510 11610 11600 11800 11200 11210. Patchy
fog tonight. Scattered showers and thunderstorms tonight. Waves 1
to 3 feet.

Superior North Central 14520 11610 11600 11700 11100. Patchy fog
this afternoon through tonight. Scattered showers and thunderstorms
overnight. Waves 1 to 3 feet.

Superior South Central 11410 13510 11500 11100 11300 11400. Waves
2 feet or less.

Superior East 11410 11420 11520 11510 12600 12510. Waves 1 to 3
feet.

$$

KEC

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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