Great Lakes Forecast
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FZUS63 KMQT 222045
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
345 PM EST Wed Nov 22 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 30.4 high over the Ohio Valley will move east as a
weakening 29.9 low moves through the Great Lakes overnight. Thursday,
a weak high of 30.1 over northern Ontario will extend southward
before yet another low of 29.9 inches glances the upper Great
Lakes on Friday. The region will then be dominated by a
strengthening high of 30.1 inches passing through the central
United States Saturday and Sunday. A developing low pressure
system of 29.1 inches will then impact the region late Monday.

LSZ162-230445-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
345 PM EST Wed Nov 22 2017 /245 PM CST Wed Nov 22 2017/

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Isolated
snow showers. Waves 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west by
midnight. Scattered snow showers in the evening. Waves building
to 3 to 6 feet occasionally to 8 feet, then subsiding to 2 to
4 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots increasing to
20 to 30 knots. Waves building to 3 to 6 feet occasionally to
8 feet.
.FRIDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots in the afternoon. A chance of rain showers. Waves 3 to
6 feet occasionally to 8 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots. Waves 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...Northwest winds 15 to 25 knots. A chance of snow
showers. Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots veering northwest. Waves
building to 1 to 3 feet.

$$

LSZ263-230445-
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-
345 PM EST Wed Nov 22 2017

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Isolated
snow showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 15 to 25 knots becoming west 20 to
30 knots by midnight, then diminishing to 15 to 25 knots late.
Isolated snow showers. Waves building to 4 to 7 feet occasionally
to 9 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots increasing to
20 to 30 knots. A slight chance of rain and snow showers in the
evening. Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...Southwest winds 20 to 30 knots veering west in the
afternoon. A chance of rain showers. Waves building to 6 to 9
feet occasionally to 11 feet.
.FRIDAY NIGHT...West gales to 35 knots becoming northwest 20 to
30 knots after midnight. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots in the afternoon. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots veering northwest. A chance
of rain and snow showers. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.

$$

LSZ264-230445-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
345 PM EST Wed Nov 22 2017

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Isolated
snow showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 15 to 25 knots becoming west 20 to
30 knots by midnight. Scattered snow showers. Waves building to
4 to 8 feet occasionally to 10 feet.
.THURSDAY...Northwest winds 15 to 25 knots diminishing to 5 to
15 knots. Isolated snow showers in the morning. Waves subsiding
to 1 to 3 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots becoming south
15 to 25 knots by midnight, then becoming southwest 20 to
30 knots late. A slight chance of rain and snow showers. Waves
subsiding to calm to 2 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY...Southwest winds 20 to 30 knots becoming west gales to
35 knots in the afternoon. A chance of rain showers. Waves
building to 6 to 9 feet occasionally to 11 feet.
.FRIDAY NIGHT...West gales to 35 knots becoming northwest 20 to
30 knots after midnight. A chance of rain showers. Waves 6 to
9 feet occasionally to 11 feet.
.SATURDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A chance of snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Waves building to 2 to
4 feet, then subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots veering northwest. A chance
of rain showers. A chance of snow showers. Waves building to 2 to
4 feet.

$$

LSZ265-230445-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
345 PM EST Wed Nov 22 2017

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west by
midnight. Isolated snow showers after midnight. Waves building to
3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. Isolated snow showers in the morning.
Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots becoming south 15 to
25 knots by midnight, then increasing to 20 to 30 knots late. A
slight chance of rain and snow showers in the evening. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.FRIDAY...Southwest winds 20 to 30 knots veering west in the
afternoon. A chance of rain showers. Waves building to 3 to 5
feet occasionally to 7 feet.
.FRIDAY NIGHT...West gales to 35 knots veering northwest after
midnight. A chance of rain showers. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots in the afternoon. Snow showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.SUNDAY...Southwest winds 15 to 25 knots. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.MONDAY...South winds 15 to 25 knots veering west. Waves building
to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ266-230445-
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-
345 PM EST Wed Nov 22 2017

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Isolated
snow showers. Waves 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 20 to 30 knots veering west by
midnight, then diminishing to 15 to 25 knots late. Isolated snow
showers after midnight. Waves building to 5 to 8 feet
occasionally to 10 feet.
.THURSDAY...West winds 15 to 25 knots becoming northwest 20 to
30 knots by late morning, then diminishing to 10 to 20 knots by
mid afternoon. Isolated snow showers in the morning. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots becoming south
15 to 25 knots by midnight, then increasing to gales to 35 knots
late. A slight chance of rain and snow showers. Waves subsiding
to 1 to 3 feet, then building to 4 to 7 feet occasionally to
9 feet.
.FRIDAY...Southwest winds 20 to 30 knots. A chance of rain
showers in the morning, then rain showers likely in the
afternoon. Waves building to 4 to 8 feet occasionally to 10 feet.
.FRIDAY NIGHT...West gales to 35 knots veering northwest after
midnight. A chance of rain and snow showers. Waves building to 8
to 12 feet occasionally to 15 feet.
.SATURDAY...Northwest gales to 35 knots. A chance of rain and snow
showers. Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Snow showers. Waves subsiding to 2
to 4 feet.
.SUNDAY...Southwest winds 15 to 25 knots. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.MONDAY...South winds 15 to 25 knots veering west. A chance of
rain showers. Waves subsiding to 1 to 3 feet, then building to
3 to 5 feet occasionally to 7 feet.

$$

LSZ267-230445-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
345 PM EST Wed Nov 22 2017

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Isolated
snow showers. Waves 2 to 4 feet.
.TONIGHT...Southwest winds 20 to 30 knots veering west late.
Isolated snow showers after midnight. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots by mid afternoon. Scattered snow showers, possibly mixed
with rain. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots backing south by
midnight, then increasing to 20 to 30 knots late. A slight chance
of rain and snow showers. Waves subsiding to 1 to 3 feet, then
building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...South gales to 35 knots becoming southwest 20 to
30 knots in the afternoon. Rain showers. Waves building to 5 to 8
feet occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...West gales to 35 knots backing northwest after
midnight. Rain showers possibly mixed with snow. Waves building
to 9 to 12 feet occasionally to 15 feet.
.SATURDAY...Northwest gales to 35 knots. Rain and snow showers.
Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Snow showers. Waves subsiding to 2
to 4 feet.
.SUNDAY...Southwest winds 15 to 25 knots. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.MONDAY...South winds 15 to 25 knots. A chance of rain showers.
Waves subsiding to 1 to 3 feet, then building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ261-230445-
MAFOR 2222/
Superior West 12530 11540 12630 12620 11610. Scattered snow
showers this evening. Waves 3 to 6 feet tonight subsiding to 1 to
3 feet Thursday.

Superior North Central 11530 11540 13640 11730 12720. Scattered
snow showers from late evening on tonight. Waves 5 to 8 feet
tonight subsiding to 2 to 4 feet Thursday.

Superior South Central 11520 12530 13630 12730. Waves 1 to 3 feet
building to 3 to 5 feet tonight.

Superior East 13530 13630 12730. Scattered snow showers. Waves 3
to 6 feet tonight building to 5 to 7 feet Thursday.

$$

Borchardt

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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