Great Lakes Forecast
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FZUS63 KMQT 140809
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
409 AM EDT Mon Aug 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...As weak low pressures of 29.8 inches over northern
Ontario and southwest Minnesota move east today and tonight, high
pressure of 30.0 inches will build into northern Ontario. The high
will then settle over the Upper Great Lakes on Tuesday. As the
high shifts east Tuesday night and Wednesday, low pressure of 29.7
inches will organize over the Central Plains. The low will track
across the Upper Great Lakes on Thursday and reach the Lower Great
Lakes on Friday. In its wake, high pressure of 29.9 inches will
shift east to the western Great Lakes.

LSZ162-141615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
409 AM EDT Mon Aug 14 2017 /309 AM CDT Mon Aug 14 2017/

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Scattered
showers. Waves calm to 2 feet.
.TODAY...Northeast winds 5 to 15 knots veering east late.
Scattered showers. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing east in the
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots. A slight chance of
showers after midnight. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers through early
afternoon, then showers likely by mid afternoon. Waves building
to 2 to 4 feet.
.WEDNESDAY NIGHT...East winds 15 to 25 knots. Showers. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing west. Waves calm
to 2 feet.

$$

LSZ263-141615-
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-
409 AM EDT Mon Aug 14 2017

.EARLY THIS MORNING...South winds less than 10 knots. Isolated
showers. Waves calm to 2 feet.
.TODAY...Southwest winds less than 10 knots increasing to 5 to
15 knots late. Scattered showers. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots backing east in the
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers. Waves building to
1 to 3 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Showers likely. Waves building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY...East winds 15 to 25 knots becoming northwest 5 to
15 knots. A chance of showers. Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing southwest. Waves
calm to 2 feet.

$$

LSZ264-141615-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
409 AM EDT Mon Aug 14 2017

.EARLY THIS MORNING...West winds less than 10 knots. Isolated
showers. Waves calm to 2 feet.
.TODAY...West winds less than 10 knots backing southwest in the
afternoon, then increasing to 5 to 15 knots late. Isolated
showers. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots veering northeast in the
afternoon, then becoming east less than 10 knots late. Waves calm
to 2 feet.
.TUESDAY NIGHT...Southeast winds less than 10 knots increasing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots backing east by mid
afternoon. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of showers through midnight.
Showers likely after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...East winds 15 to 25 knots becoming north 10 to
20 knots. A chance of showers. Waves subsiding to 1 to 3 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing southwest. Waves
subsiding to calm to 2 feet.

$$

LSZ265-141615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
409 AM EDT Mon Aug 14 2017

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Isolated
showers. Waves calm to 2 feet.
.TODAY...West winds less than 10 knots becoming northeast 5 to
15 knots in the afternoon, then backing north late. Isolated
showers by mid afternoon. Waves calm to 2 feet.
.TONIGHT...Northwest winds 5 to 15 knots backing west after
midnight. Isolated showers through midnight. Waves calm to
2 feet.
.TUESDAY...West winds 5 to 15 knots becoming north 10 to 20 knots
in the afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots veering southeast after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...East winds 15 to 25 knots. A chance of showers
through midnight. Showers likely after midnight. Waves building
to 2 to 4 feet.
.THURSDAY...East winds 10 to 20 knots backing northwest. A chance
of showers. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.
.FRIDAY...Northwest winds 10 to 20 knots backing west. Waves
subsiding to calm to 2 feet.

$$

LSZ266-141615-
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-
409 AM EDT Mon Aug 14 2017

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Isolated
showers. Waves calm to 2 feet.
.TODAY...West winds less than 10 knots becoming north 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots backing northwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots becoming north 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.WEDNESDAY NIGHT...East winds 15 to 25 knots veering southeast
after midnight. A chance of showers. Waves building to 3 to
5 feet occasionally to 7 feet.
.THURSDAY...East winds 15 to 25 knots becoming north 10 to
20 knots. A chance of showers. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.FRIDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ267-141615-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
409 AM EDT Mon Aug 14 2017

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...South winds 5 to 15 knots backing north in the
afternoon. Waves calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots backing northwest after
midnight. Waves calm to 2 feet.
.TUESDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Waves calm to 2 feet.
.WEDNESDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...East winds 10 to 20 knots becoming southeast
20 to 30 knots after midnight. A chance of showers. Waves
building to 2 to 4 feet.
.THURSDAY...Southeast winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.

$$

LSZ261-141615-
MAFOR 1409/
Superior West 11300 13200 11300 11400 12600. Scattered showers
today. Waves 1 foot or less.

Superior North Central 13600 12500 13600. Waves 2 feet or less.

Superior South Central 12600 11800 12100 11800 11700 11600. Waves
1 foot or less.

Superior East 12500 11600 11700 12800 12700. Waves 1 foot or
less.

$$

Rolfson

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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