Great Lakes Forecast
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FZUS63 KMQT 110800
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EDT Wed Oct 11 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 30.3 inch high pressure ridge over the Upper Great
Lakes will move over Quebec and northern New England through
Thursday while a 29.7 inch low pressure trough emerges over the
western High Plains. This low will track northeast and strengthen
to 29.2 inches over Hudson Bay by Friday as it pushes a 29.9 inch
trough across Lake Superior. A 30.2 inch ridge will briefly move
over Lake Superior Saturday, but a 29.7 inch low will quickly
swing out of the southern plains to over the central Great Lakes
on Sunday.

LSZ162-111600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EDT Wed Oct 11 2017 /300 AM CDT Wed Oct 11 2017/

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...East winds 5 to 15 knots increasing to 10 to 20 knots in
the afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots becoming south 15 to
25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.THURSDAY...South winds 15 to 25 knots. A slight chance of
showers through early afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots becoming southwest
10 to 20 knots after midnight. A slight chance of showers after
midnight. Waves building to 2 to 4 feet.
.FRIDAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.SATURDAY...East winds 5 to 15 knots becoming northeast 15 to
25 knots. A chance of showers. Waves building to 2 to 4 feet.
.SUNDAY...North winds 20 to 30 knots becoming northwest 10 to
20 knots. A chance of showers. Waves subsiding to 1 to 3 feet.

$$

LSZ263-111600-
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-
400 AM EDT Wed Oct 11 2017

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...East winds 5 to 15 knots. Waves building to 1 to 3 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 2 to 4 feet.
.THURSDAY...South winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A slight chance of showers after midnight. Waves
building to 2 to 4 feet.
.FRIDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 2 to 4 feet.
.SUNDAY...North winds 20 to 30 knots becoming northwest 10 to
20 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 1 to 3 feet.

$$

LSZ264-111600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EDT Wed Oct 11 2017

.EARLY THIS MORNING...Variable winds less than 10 knots. Waves
calm to 2 feet.
.TODAY...East winds 5 to 15 knots. Waves building to 1 to 3 feet.
.TONIGHT...Southeast winds 10 to 20 knots veering south after
midnight. Waves building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...South winds 10 to 20 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A slight chance of showers after midnight. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering northwest after
midnight. Waves 1 to 3 feet.
.SATURDAY...North winds 5 to 15 knots becoming northeast 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SUNDAY...Northeast gales to 35 knots becoming north 15 to
25 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ265-111600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EDT Wed Oct 11 2017

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...East winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TONIGHT...Southeast winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then veering south late. Waves building
to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...South winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...Southwest winds 10 to 20 knots veering west by mid
afternoon. A chance of showers. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots veering northwest after
midnight. A chance of showers through midnight. Waves building to
1 to 3 feet.
.SATURDAY...North winds 10 to 20 knots becoming northeast 15 to
25 knots. Showers likely. Waves subsiding to calm to 2 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northeast gales to 35 knots becoming north 20 to
30 knots. Showers likely, then a chance of showers. Waves
building to 4 to 7 feet occasionally to 9 feet.

$$

LSZ266-111600-
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-
400 AM EDT Wed Oct 11 2017

.EARLY THIS MORNING...East winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...East winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then veering south late. Waves building
to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...South winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots. Waves subsiding to
2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots by mid afternoon. A chance of showers. Waves subsiding
to 1 to 3 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots veering northwest after
midnight. Showers likely through midnight, then a chance of
showers after midnight. Waves building to 2 to 4 feet.
.SATURDAY...North winds 10 to 20 knots becoming northeast 15 to
25 knots. Waves subsiding to calm to 2 feet, then building to
3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northeast gales to 35 knots backing north. Showers
likely, then a chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet.

$$

LSZ267-111600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EDT Wed Oct 11 2017

.EARLY THIS MORNING...East winds 10 to 20 knots. Waves 1 to 3 feet.
.TODAY...East winds 10 to 20 knots. Waves subsiding to calm to 2
feet.
.TONIGHT...Southeast 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.
.THURSDAY...Southeast winds 15 to 25 knots. Waves subsiding to
1 to 3 feet, then building to 2 to 4 feet.
.THURSDAY NIGHT...South winds 15 to 25 knots. A slight chance of
showers. Waves subsiding to 1 to 3 feet.
.FRIDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots by mid afternoon. Showers likely by mid afternoon. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots veering northwest after
midnight. Showers likely through midnight, then a chance of
showers after midnight. Waves 1 to 3 feet.
.SATURDAY...North winds 10 to 20 knots becoming northeast 15 to
25 knots. Showers. Waves subsiding to calm to 2 feet, then
building to 2 to 4 feet.
.SUNDAY...Northeast gales to 40 knots backing north. Showers,
then a chance of showers. Waves building to 4 to 7 feet
occasionally to 9 feet.

$$

LSZ261-111600-
MAFOR 1109/
Superior West 11300 13210 12220 11320 11420. Waves 2 feet or less
today. Waves 2 to 4 feet tonight.

Superior North Central 11900 11210 12310 12320 11330 11430. Waves
2 feet or less today. Waves 2 to 4 feet building to 3 to 5 feet
tonight.

Superior South Central 11200 11210 11220 11210 11220 13320. Waves
2 feet or less building to 2 to 3 feet today. Waves 2 to 4 feet
tonight.

Superior East 14210 11210 13320. Waves 1 to 4 feet.

$$

JLA

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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