Great Lakes Forecast
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FZUS63 KMQT 150206
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1006 PM 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 continues to stretch from
the central Plains to Lake Superior and will remain nearly
stationary through Saturday. Low pressure of 29.7 inches will then
develop along the trough over Minnesota Saturday morning. As this
low lifts into northern Ontario on Sunday, the associated cold
front will sweep across Lake Superior. In its wake, high pressure
of 30.2 inches will build over the Upper Great Lakes on Monday and
drift over eastern Ontario Tuesday.

LSZ162-151015-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1006 PM EDT Thu Sep 14 2017 /906 PM CDT Thu Sep 14 2017/

.REST OF TONIGHT...Northeast winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then increasing to 10 to 20 knots
late. Patchy fog. A chance of showers and thunderstorms. Waves 2
to 4 feet 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
through early afternoon. A chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. 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...South winds 10 to 20 knots becoming southeast 5 to
15 knots by mid afternoon. A chance of showers. A chance of
thunderstorms by mid afternoon. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots veering west after
midnight. Showers likely and a chance of thunderstorms. Waves
calm to 2 feet.
.SUNDAY...West winds 15 to 25 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering southeast. Waves
calm to 2 feet.

$$

LSZ263-151015-
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-
1006 PM EDT Thu Sep 14 2017

.REST OF TONIGHT...Northeast winds 5 to 15 knots. Patchy fog. A
chance of showers and thunderstorms. Waves 2 to 4 feet 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, then increasing to 15 to 25 knots
late. Patchy fog through early afternoon. A chance of showers. A
slight chance of thunderstorms by mid afternoon. 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 veering east after
midnight, then becoming southeast 5 to 15 knots late. A chance of
showers and a slight chance of thunderstorms. Waves building to
3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet.
.SATURDAY...South winds 5 to 15 knots. A chance of showers. A
chance of thunderstorms by mid afternoon. Waves subsiding to calm
to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. Showers likely and a chance of
thunderstorms. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.SUNDAY...West winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots. Waves building to 1 to
3 feet.

$$

LSZ264-151015-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1006 PM EDT Thu Sep 14 2017

.REST OF TONIGHT...Northeast winds 5 to 15 knots. Patchy fog. A
chance of showers and a slight chance of thunderstorms. Waves
2 to 4 feet subsiding to 1 to 3 feet.
.FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. Patchy fog through early afternoon. A
chance of showers. A slight chance of thunderstorms by mid
afternoon. 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, then becoming southeast 5 to 15 knots late. A chance of
showers and a slight chance of thunderstorms. Waves building to
3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet.
.SATURDAY...South winds 10 to 20 knots becoming southeast 5 to
15 knots by mid afternoon. A chance of showers. A slight chance
of thunderstorms by mid afternoon. Waves subsiding to 1 to
3 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Showers likely. Waves 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots. A chance of showers through
early afternoon. Waves building to 3 to 5 feet occasionally to
7 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 5 to 15 knots backing south. Waves
subsiding to calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots. Waves building to 1 to
3 feet.

$$

LSZ265-151015-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1006 PM EDT Thu Sep 14 2017

.REST OF TONIGHT...South winds 5 to 15 knots. A slight chance of
showers and thunderstorms after midnight. Waves 2 to 4 feet
subsiding to calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots late. A slight chance of showers through early
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots veering south
after midnight. A chance of showers and a slight chance of
thunderstorms. Waves building to 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots. A slight chance of
showers. A slight chance of thunderstorms by mid afternoon. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.SUNDAY...West winds 15 to 25 knots. A chance of showers through
early afternoon. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots. Waves building to 1 to
3 feet.

$$

LSZ266-151015-
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-
1006 PM EDT Thu Sep 14 2017

.REST OF TONIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots late. A slight chance of showers and thunderstorms.
Patchy fog after midnight. Waves 3 to 5 feet occasionally to
7 feet subsiding to 2 to 4 feet.
.FRIDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots late. Patchy fog through early afternoon. A slight
chance of showers through early afternoon. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. A slight 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 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A slight chance of showers. A slight
chance of thunderstorms by mid afternoon. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers. Waves 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots. A chance of showers. Waves
building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...South winds 5 to 15 knots backing southeast. Waves
subsiding to calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots. Waves building to 1 to
3 feet.

$$

LSZ267-151015-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1006 PM EDT Thu Sep 14 2017

.REST OF TONIGHT...South winds 10 to 20 knots. Patchy fog after
midnight. A slight chance of showers after midnight. Waves 1 to
3 feet building to 2 to 4 feet.
.FRIDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then increasing to 10 to 20 knots late. Patchy
fog through early afternoon. A slight chance of showers through
early afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. A slight chance of
showers after midnight. Waves building to 1 to 3 feet.
.SATURDAY...South winds 15 to 25 knots. Waves subsiding to calm
to 2 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots. Waves building to
1 to 3 feet.
.SUNDAY...South winds 10 to 20 knots becoming west 15 to 25 knots
by mid afternoon. A chance of showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.MONDAY...Northwest winds 5 to 15 knots backing southeast. Waves
subsiding to calm to 2 feet.
.TUESDAY...Southeast winds 10 to 20 knots. Waves calm to 2 feet.

$$
LSZ261-151015-
MAFOR 1503/
Superior West 13120 11220 14130. Patchy fog. A chance of showers
and thunderstorms overnight. Chance of showers through mid
morning Friday, then a chance of showers and thunderstorms Friday
evening. Waves 2 to 4 feet overnight building to 3 to 5 feet
Friday. Waves 4 to 6 feet Friday evening.

Superior North Central 11120 14110 13120. Patchy fog.
Chance of showers Friday morning, then a chance of showers Friday
evening. Waves 1 to 3 feet building to 2 to 4 feet overnight.
Waves 2 to 4 feet building to 3 to 5 feet Friday evening.

Superior South Central 11420 12410 11300 13310 11320. Waves 2 to
4 feet subsiding to 1 to 3 feet overnight. Waves 1 to 3 feet
Friday and Friday evening.

Superior East 12420 13410 11300 11310 11320. Patchy fog through
mid morning. Chance of showers through mid morning Friday. Waves
2 to 4 feet overnight subsiding to 1 to 3 feet Friday. Waves 1 to
3 feet Friday evening.

$$

RJT

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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