Great Lakes Forecast
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FZUS63 KMQT 140750
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
350 AM EDT Thu Sep 14 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...A 29.8 inch low pressure trough will remain nearly
stationary from the western Plains to Lake Superior through
Saturday. Low pressure of 29.7 inches will then develop along the
trough over Minnesota Saturday evening. As this low lifts into
northern Ontario on Sunday, the associated cold front will sweep
across Lake Superior. In its wake, high pressure of 30.1 inches
will build over the Upper Great Lakes on Monday.

LSZ162-141600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
350 AM EDT Thu Sep 14 2017 /250 AM CDT Thu Sep 14 2017/

.EARLY THIS MORNING...East winds 5 to 15 knots. Patchy fog. Waves
calm to 2 feet.
.TODAY...East winds 5 to 15 knots backing northeast in the
afternoon, then increasing to 10 to 20 knots late. Patchy fog
through early afternoon. Isolated showers and thunderstorms late.
Waves building to 2 to 4 feet.
.TONIGHT...Northeast winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Patchy fog. Scattered showers and
thunderstorms. Waves subsiding to 1 to 3 feet.
.FRIDAY...East winds 10 to 20 knots backing northeast in the
afternoon, then increasing to 15 to 25 knots late. Patchy fog. A
chance of showers and a slight chance of thunderstorms. Waves
building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...East winds 10 to 20 knots. Patchy fog. A chance
of showers and thunderstorms. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.
.SATURDAY...East winds 10 to 20 knots. Patchy fog. A chance of
showers and thunderstorms. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots. Patchy fog. Showers
and thunderstorms likely. Waves calm to 2 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 5 to 15 knots.
Patchy fog. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots.
Waves calm to 2 feet.

$$

LSZ263-141600-
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-
350 AM EDT Thu Sep 14 2017

.EARLY THIS MORNING...East winds 5 to 15 knots. Patchy fog. Waves
calm to 2 feet.
.TODAY...East winds 5 to 15 knots backing northeast in the
afternoon, then increasing to 10 to 20 knots late. Waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TONIGHT...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering east late. Patchy fog.
Scattered showers and thunderstorms. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.FRIDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots in the afternoon. Patchy fog. A chance of showers and a
slight chance of thunderstorms. Waves subsiding to calm to
2 feet, then building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Northeast winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Patchy fog. A chance of showers and
thunderstorms. Waves 3 to 6 feet occasionally to 8 feet subsiding
to 2 to 4 feet.
.SATURDAY...East winds 5 to 15 knots. Patchy fog. A chance of
showers and thunderstorms. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Patchy fog. Showers and thunderstorms
likely. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Patchy fog. A chance of showers and thunderstorms.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ264-141600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
350 AM EDT Thu Sep 14 2017

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...East winds 5 to 15 knots backing northeast late.
Isolated showers and thunderstorms through early afternoon. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TONIGHT...Northeast winds 5 to 15 knots. Patchy fog. Scattered
showers through midnight, then numerous showers. Scattered
thunderstorms. Waves building to 2 to 4 feet, then subsiding to 1
to 3 feet.
.FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots late. Patchy fog. A slight chance of thunderstorms
through early afternoon. A chance of showers. Waves subsiding to
calm to 2 feet, then building to 2 to 4 feet.
.FRIDAY NIGHT...Northeast winds 10 to 20 knots veering east after
midnight. Areas of fog. A chance of showers and thunderstorms.
Waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to 2 to 4 feet.
.SATURDAY...East winds 5 to 15 knots. Patchy fog. A chance of
showers and thunderstorms. Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering southeast
after midnight. Patchy fog. A chance of showers and thunderstorms
through midnight. Showers and thunderstorms likely after
midnight. Waves 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Areas of fog. A chance of showers and thunderstorms.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 1 to 3 feet.
.MONDAY...South winds 5 to 15 knots backing southeast. Waves
subsiding to calm to 2 feet.

$$

LSZ265-141600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
350 AM EDT Thu Sep 14 2017

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots backing southeast in the
afternoon. Waves building to 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
after midnight, then diminishing to 5 to 15 knots late. Scattered
showers and thunderstorms. Waves building to 2 to 4 feet, then
subsiding to calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon, then backing east late. A chance of
showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. A chance of showers
and thunderstorms. Waves building to 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. A chance of showers and thunderstorms. Waves subsiding
to calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots. A chance of showers
and thunderstorms. Waves calm to 2 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers and thunderstorms. Waves building
to 2 to 4 feet, then subsiding to calm to 2 feet.
.MONDAY...East winds 10 to 20 knots veering southeast. Waves calm
to 2 feet.

$$

LSZ266-141600-
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-
350 AM EDT Thu Sep 14 2017

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Waves building to 1 to 3 feet.
.TONIGHT...South winds 10 to 20 knots. Scattered showers and
thunderstorms. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.FRIDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Patchy fog. A chance of thunderstorms through
early afternoon. A chance of showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. Patchy fog. A chance
of showers and thunderstorms. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots. Patchy fog. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots. Patchy fog. A
chance of showers and thunderstorms. Waves 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. A chance of showers and thunderstorms. Waves building
to 3 to 5 feet occasionally to 7 feet, then subsiding to 1 to
3 feet.
.MONDAY...Northwest winds 10 to 20 knots veering east. Waves
subsiding to calm to 2 feet.

$$

LSZ267-141600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
350 AM EDT Thu Sep 14 2017

.EARLY THIS MORNING...South winds 10 to 20 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...South winds 10 to 20 knots becoming southeast 5 to
15 knots in the afternoon, then becoming south 10 to 20 knots
late. Patchy fog through early afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots. Isolated showers and
thunderstorms after midnight. Waves building to 2 to 4 feet.
.FRIDAY...South winds 10 to 20 knots. Patchy fog. A chance of
thunderstorms through early afternoon. A chance of showers. Waves
subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. Patchy fog. A slight
chance of showers. A slight chance of thunderstorms after
midnight. Waves building to 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots. Patchy fog. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots. Patchy fog. A
chance of showers and thunderstorms. Waves building to 1 to
3 feet.
.SUNDAY...South winds 15 to 25 knots becoming northwest 10 to
20 knots. Patchy fog. A chance of showers and thunderstorms.
Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.
.MONDAY...Northwest winds 10 to 20 knots becoming east 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ261-141600-
MAFOR 1409/
Superior West 13210 11110 13120 11226. Patchy fog this morning and
tonight. Scattered showers and thunderstorms late in the evening.
Scattered thunderstorms overnight. Waves 1 to 4 feet.

Superior North Central 15210 11210 11116. Patchy fog from late
evening on. Scattered showers and thunderstorms late in the
evening. Scattered thunderstorms overnight. Waves 1 to 4 feet.

Superior South Central 12400 11300 11310 11320 13420. Scattered
showers and thunderstorms late tonight. Waves 1 to 4 feet.

Superior East 11300 11400 12310 11410 13420. Patchy fog through
mid morning. Scattered showers and thunderstorms late tonight.
Waves 1 to 4 feet.

$$

Rolfson

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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