Great Lakes Forecast
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486
FZUS63 KMQT 240150
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
950 PM 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 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.

LSZ162-241000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
950 PM EDT Sat Sep 23 2017 /850 PM CDT Sat Sep 23 2017/

.REST OF TONIGHT...North winds 5 to 15 knots veering east late.
Patchy fog. A chance of showers and thunderstorms. Waves calm to
2 feet.
.SUNDAY...East winds 5 to 15 knots. Patchy fog through early
afternoon. A slight chance of showers through early afternoon.
Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 10 to 20 knots veering south after
midnight, then becoming southwest 5 to 15 knots late. Patchy fog.
A chance of showers and a slight chance of thunderstorms. Waves
calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering northwest by mid
afternoon. Patchy fog. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots. A chance of
showers through midnight, then showers likely after midnight.
Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots. Showers likely through
early afternoon, then a chance of showers by mid afternoon. Waves
building to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots becoming west
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 becoming northwest 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ263-241000-
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-
950 PM EDT Sat Sep 23 2017

.REST OF TONIGHT...North winds less than 10 knots becoming
northeast 5 to 15 knots after midnight, then veering east late.
Patchy fog. A chance of showers and thunderstorms. Waves calm to
2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast late.
Patchy fog through early afternoon. A slight chance of showers
through early afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Patchy 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. Patchy fog. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Showers likely. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Showers likely through
early afternoon, then a chance of showers by mid afternoon. Waves
building to 2 to 4 feet.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots becoming west
10 to 20 knots after midnight. A chance of showers. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.THURSDAY...West winds 5 to 15 knots becoming north 10 to
20 knots. A chance of showers. Waves subsiding to calm to 2 feet,
then building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ264-241000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
950 PM EDT Sat Sep 23 2017

.REST OF TONIGHT...West winds less than 10 knots veering
northwest after midnight, then veering east late. Patchy fog. A
slight chance of showers and thunderstorms. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing southeast late. A
slight chance of showers and thunderstorms through early
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. Patchy fog. A slight chance of showers and
thunderstorms after midnight. Waves building to 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Patchy fog. A chance of showers and a
slight chance of thunderstorms. Waves subsiding to 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. Showers likely through
early afternoon, then a chance of showers by mid afternoon. Waves
building to 2 to 4 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots backing west after
midnight. A chance of showers. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots veering northwest. Waves
building to 2 to 4 feet.
.THURSDAY...West winds 5 to 15 knots becoming north 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
4 to 7 feet occasionally to 9 feet.

$$

LSZ265-241000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
950 PM EDT Sat Sep 23 2017

.REST OF TONIGHT...East winds less than 10 knots becoming
southeast 5 to 15 knots late. A slight chance of showers and
thunderstorms by late evening. Patchy fog. 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 increasing to 15 to
25 knots after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming north 5 to 15 knots
by mid afternoon. Patchy fog by mid afternoon. A chance of
showers and thunderstorms by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots. A chance of showers
and thunderstorms. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. A chance of showers through early afternoon. A
chance of thunderstorms. Showers likely by mid afternoon. Waves
building to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots becoming west
20 to 30 knots after midnight. A chance of showers. Waves 1 to
3 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves 1 to 3 feet.
.THURSDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves subsiding to calm to 2 feet,
then building to 4 to 7 feet occasionally to 9 feet.

$$

LSZ266-241000-
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-
950 PM EDT Sat Sep 23 2017

.REST OF TONIGHT...Northeast winds less than 10 knots veering
east after midnight, then becoming southeast 5 to 15 knots late.
Patchy fog. 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 15 to 25 knots diminishing to 10 to
20 knots late. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.MONDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Patchy fog by mid afternoon. A chance of
showers and a slight chance of thunderstorms by mid afternoon.
Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...North winds 5 to 15 knots. A chance of showers
and thunderstorms. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. A chance of showers
through early afternoon. Showers likely by mid afternoon. Waves
building to 2 to 4 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots increasing to 20 to
30 knots after midnight. Showers likely through midnight, then a
chance of showers after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Waves building to 2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots becoming north 15 to
25 knots. A chance of showers. Waves building to 5 to 8 feet
occasionally to 10 feet.

$$

LSZ267-241000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
950 PM EDT Sat Sep 23 2017

.REST OF TONIGHT...South winds 5 to 15 knots veering southwest
after midnight, then backing south late. Patchy fog. Waves calm
to 2 feet.
.SUNDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
Waves building to 1 to 3 feet.
.MONDAY...South winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots veering northwest by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots increasing to 20 to
30 knots after midnight. Showers likely through midnight, then a
chance of showers after midnight. Waves building to 1 to 3 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Northwest winds 10 to 20 knots becoming north 15 to
25 knots. A chance of showers. Waves subsiding to 2 to 4 feet,
then building to 3 to 6 feet occasionally to 8 feet.

$$
LSZ261-241000-
MAFOR 2403/
Superior West 12110 11210 13300 12310. Patchy fog. Chance of
showers and thunderstorms overnight through mid morning Sunday.
Waves 1 to 2 feet.

Superior North Central 11600 11700 11200 11300 12400 11310 11320.
Patchy fog early Sunday afternoon and evening. Waves 2 feet or
less.


Superior South Central 12200 11300 13410 12420. Patchy fog
overnight and Sunday morning. Waves calm to 3 feet Sunday
evening.


Superior East 11200 11300 11400 14410 11420. Patchy fog overnight
and Sunday morning. Waves 2 feet or less.

$$

Petro

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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