Great Lakes Forecast
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FZUS63 KMQT 121936
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
336 PM EDT Sat Aug 12 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 30.1 inch high pressure centered over Minnesota will
build across the Upper Great Lakes this evening and remain nearly
stationary through Tuesday. As the high moves over the east coast
Wednesday, a 29.6 inch low pressure will make its way from the
northern Plains to central Upper Michigan. The low will shift east
of Lake Superior through the day Thursday as a 29.9 inch ridge
builds back into the Upper Great Lakes region.

LSZ162-130345-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
336 PM EDT Sat Aug 12 2017 /236 PM CDT Sat Aug 12 2017/

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. A slight chance of
showers by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots. Showers. Waves building
to 2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ263-130345-
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-
336 PM EDT Sat Aug 12 2017

.TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. A slight chance of showers after midnight. Waves calm
to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots. A slight chance of
showers. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...East winds less than 10 knots becoming northeast 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. A chance of showers after midnight. Waves calm to
2 feet.
.WEDNESDAY...East winds 10 to 20 knots. A chance of showers.
Showers likely. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.

$$

LSZ264-130345-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
336 PM EDT Sat Aug 12 2017

.TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots veering west late.
Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. A slight chance of showers through early afternoon.
Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.TUESDAY...South winds 5 to 15 knots becoming east less than
10 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots. A chance of showers.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...East winds 10 to 20 knots becoming west 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-130345-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
336 PM EDT Sat Aug 12 2017

.LATE THIS AFTERNOON...Northwest winds less than 10 knots. Waves
calm to 2 feet.
.TONIGHT...West winds less than 10 knots increasing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing south late. Waves calm
to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight, then becoming west 10 to 20 knots late. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots backing south by mid
afternoon. A slight chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southeast winds 10 to 20 knots. A chance of
showers after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...North winds 10 to 20 knots backing west. Waves
subsiding to calm to 2 feet.

$$

LSZ266-130345-
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-
336 PM EDT Sat Aug 12 2017

.TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest late. Waves
calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. A slight chance of showers by
mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers, then showers likely. Waves
building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...East winds 10 to 20 knots veering west. A chance of
showers. Waves subsiding to calm to 2 feet.

$$

LSZ267-130345-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
336 PM EDT Sat Aug 12 2017

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest late. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering west in the
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest late.
Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots veering northeast by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.
.THURSDAY...East winds 10 to 20 knots. A chance of showers. Waves
subsiding to calm to 2 feet.

$$

LSZ261-130345-
MAFOR 1221/
Superior West 11510 14600 13500. Waves 1 foot or less.

Superior North Central 12610 14600 11500 11510. Waves 2 feet or
less.

Superior South Central 11700 15600 11500. Waves 1 foot or less.

Superior East 11610 11710 11700 11600 11500 13600. Waves 1 to 2
feet.

$$

07

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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