Great Lakes Forecast
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FZUS63 KMQT 142003
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
403 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 extending from the
western Plains to Lake Superior 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.

LSZ162-150415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
403 PM EDT Thu Sep 14 2017 /303 PM CDT Thu Sep 14 2017/

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Patchy fog.
Waves 1 to 3 feet building to 2 to 4 feet.
.TONIGHT...Northeast winds 5 to 15 knots increasing to 10 to
20 knots late. Patchy fog. Scattered showers and isolated
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
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.

$$

LSZ263-150415-
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-
403 PM EDT Thu Sep 14 2017

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Patchy fog.
Waves 1 to 3 feet building to 2 to 4 feet.
.TONIGHT...Northeast winds 5 to 15 knots. Patchy fog. Scattered
showers and isolated 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, 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.

$$

LSZ264-150415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
403 PM EDT Thu Sep 14 2017

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Patchy fog.
Waves 1 to 3 feet.
.TONIGHT...Northeast winds 5 to 15 knots. Patchy fog. Scattered
showers and isolated 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 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.

$$

LSZ265-150415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
403 PM EDT Thu Sep 14 2017

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet building to 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots. Isolated showers and
thunderstorms after midnight. Waves building to 2 to 4 feet, then
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.

$$

LSZ266-150415-
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-
403 PM EDT Thu Sep 14 2017

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots. Isolated 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 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.

$$

LSZ267-150415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
403 PM EDT Thu Sep 14 2017

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...South winds 10 to 20 knots. Patchy fog after midnight.
Isolated showers after midnight. Waves 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.

$$

LSZ261-150415-
MAFOR 1421/
Superior West 11110 14120 11220 12130. Patchy fog this evening
through mid morning. Patchy fog late. Scattered showers and
thunderstorms late tonight...then scattered showers through mid
morning Friday. Waves 1 to 3 feet building to 2 to 4 feet tonight.
Waves 2 to 4 feet Friday.

Superior North Central 11210 15110 11120. Patchy fog this
evening through mid morning. Patchy fog late. Chance of showers
Friday morning. Waves 1 to 3 feet building to 2 to 4 feet tonight.
Waves 1 to 3 feet Friday.

Superior South Central 11310 11410 11420 12410 11300 12310. Waves
1 to 2 feet building to 2 to 4 feet...then subsiding to 1 to 3
feet late. Waves 1 to 3 feet Friday.

Superior East 11310 11410 12420 13410 11300. Patchy fog through
mid morning. Chance of showers through mid morning Friday. Waves
1 to 3 feet building to 2 to 4 feet tonight. Waves 2 to 4 feet
subsiding to 1 to 3 feet Friday.

$$

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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