Great Lakes Forecast
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FZUS63 KMQT 130746
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
346 AM EDT Fri Oct 13 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 29.6 inch low pressure trough over Manitoba will
track northeast and push a 29.9 inch trough across Lake Superior
today. A 30.2 inch ridge will briefly move over Lake Superior
Saturday while low pressure of 29.7 inches develops over the
Central Plains. Expect the low to deepen to 29.4 inches as it
moves to the Upper Great Lakes on Saturday night and to 29.2
inches by the time it reaches southern Quebec on Sunday
afternoon. In the wake of the low, high pressure of 30.4 inches
over the Southern Plains on Sunday will extend a ridge of 30.2
inches over the Great Lakes on Monday. A weak trough of 29.9
inches will quickly pass over the area Tuesday followed by a
secondary 30.1 inch ridge.

LSZ162-131600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
346 AM EDT Fri Oct 13 2017 /246 AM CDT Fri Oct 13 2017/

.EARLY THIS MORNING...Southwest winds 15 to 25 knots. A slight
chance of drizzle. Waves 2 to 4 feet building to 3 to 5 feet
occasionally to 7 feet.
.TODAY...West winds 15 to 25 knots diminishing to 10 to 20 knots
late. Waves subsiding to 2 to 4 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then veering north late. Waves subsiding to calm
to 2 feet.
.SATURDAY...East winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A chance of showers by mid afternoon.
Waves building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...Northeast winds 20 to 30 knots becoming north
gales to 35 knots after midnight. Showers. Waves building to 6 to
9 feet occasionally to 11 feet.
.SUNDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots by mid afternoon. A chance of showers through early
afternoon. Waves subsiding to 2 to 4 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 10 to 20 knots backing southwest. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ263-131600-
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-
346 AM EDT Fri Oct 13 2017

.EARLY THIS MORNING...Southwest winds 15 to 25 knots. A slight
chance of drizzle. Waves 3 to 5 feet occasionally to 7 feet.
.TODAY...West winds 15 to 25 knots. A slight chance of drizzle
through early afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots becoming north 5 to 15 knots
late. Waves subsiding to calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. A chance of rain showers by mid afternoon. Waves building
to 3 to 5 feet occasionally to 7 feet.
.SATURDAY NIGHT...East winds 15 to 25 knots becoming north gales
to 35 knots after midnight. Rain showers. Waves building to 6 to
9 feet occasionally to 11 feet.
.SUNDAY...North gales to 35 knots becoming northwest 15 to
25 knots by mid afternoon. A chance of rain showers through early
afternoon. Waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 10 to 20 knots increasing to 15 to 25 knots.
Waves building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.

$$

LSZ264-131600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
346 AM EDT Fri Oct 13 2017

.EARLY THIS MORNING...Southwest winds 15 to 25 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TODAY...Southwest winds 15 to 25 knots veering west in the
afternoon. A slight chance of drizzle through early afternoon.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 10 to
20 knots late. Waves subsiding to 2 to 4 feet.
.SATURDAY...North winds 5 to 15 knots veering east in the
afternoon, then increasing to 10 to 20 knots late. A slight
chance of showers by mid afternoon. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots becoming northeast
gales to 35 knots after midnight. Showers. Waves building to 5 to
8 feet occasionally to 10 feet.
.SUNDAY...North gales to 35 knots backing northwest by mid
afternoon. Showers likely through early afternoon. Waves building
to 9 to 12 feet occasionally to 15 feet, then subsiding to 4 to
7 feet occasionally to 9 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 10 to 20 knots increasing to 20 to 30 knots.
Waves building to 5 to 8 feet occasionally to 10 feet.
.TUESDAY...West winds 15 to 25 knots becoming south 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
2 to 4 feet.

$$

LSZ265-131600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
346 AM EDT Fri Oct 13 2017

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TODAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots in the afternoon. A slight chance of drizzle through
early afternoon. Waves building to 2 to 4 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then veering northwest late. Waves
subsiding to 1 to 3 feet.
.SATURDAY...Northeast winds 10 to 20 knots veering east in the
afternoon, then increasing to 15 to 25 knots late. A chance of
showers by mid afternoon. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.SATURDAY NIGHT...East winds 20 to 30 knots backing northeast
after midnight. Showers. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SUNDAY...North gales to 35 knots backing northwest by mid
afternoon. Showers through early afternoon, then a chance of
showers by mid afternoon. Waves building to 9 to 12 feet
occasionally to 15 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots. Waves building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.

$$

LSZ266-131600-
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-
346 AM EDT Fri Oct 13 2017

.EARLY THIS MORNING...South winds 15 to 25 knots. A slight chance
of drizzle. Waves 3 to 5 feet occasionally to 7 feet.
.TODAY...Southwest winds 15 to 25 knots veering west in the
afternoon. A slight chance of drizzle through early afternoon.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 15 to 25 knots veering northwest after
midnight. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...North winds 10 to 20 knots veering east in the
afternoon. A chance of showers by mid afternoon. Waves subsiding
to calm to 2 feet, then building to 1 to 3 feet.
.SATURDAY NIGHT...East winds 20 to 30 knots becoming northeast
gales to 35 knots after midnight. Showers. Waves building to 5 to
8 feet occasionally to 10 feet.
.SUNDAY...North gales to 35 knots backing northwest by mid
afternoon. Showers through early afternoon, then a chance of
showers by mid afternoon. Waves building to 8 to 12 feet
occasionally to 15 feet.
.SUNDAY NIGHT...Northwest winds 20 to 30 knots becoming west
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...West winds 15 to 25 knots becoming southwest 20 to
30 knots. Waves subsiding to 1 to 3 feet, then building to 5 to
8 feet occasionally to 10 feet.
.TUESDAY...West winds 15 to 25 knots backing south. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.

$$

LSZ267-131600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
346 AM EDT Fri Oct 13 2017

.EARLY THIS MORNING...South winds 15 to 25 knots. A chance of
drizzle and showers. Waves 1 to 3 feet building to 2 to 4 feet.
.TODAY...Southwest winds 15 to 25 knots veering west late. A
slight chance of drizzle. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...West winds 15 to 25 knots veering northwest after
midnight. Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...North winds 10 to 20 knots veering east in the
afternoon. A chance of showers by mid afternoon. Waves subsiding
to 1 to 3 feet.
.SATURDAY NIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...North gales to 35 knots becoming northwest gales to
40 knots by mid afternoon. Showers through early afternoon, then
a chance of showers by mid afternoon. Waves building to 8 to
11 feet occasionally to 14 feet.
.SUNDAY NIGHT...North winds 20 to 30 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.MONDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots. A chance of showers. Waves subsiding to 1 to 3 feet,
then building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...West winds 20 to 30 knots becoming southwest 15 to
25 knots. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 1 to 3 feet.

$$

LSZ261-131600-
MAFOR 1309/

Superior West 11530 14630 11620 11610 11710. Waves 2 to 5 feet
subsiding to 1 to 3 feet tonight.

Superior North Central 12530 12640 13630 11730. Waves 3 to 7 feet.

Superior South Central 11420 11520 11530 12630 12620 11720. Waves
1 to 4 feet.

Superior East 13530 14630 11730. Waves 2 to 6 feet.

$$

Ritzman

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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