Great Lakes Forecast
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FZUS63 KMQT 231451
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
951 AM EST Thu Nov 23 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 weak high of 29.9 will hold over the region today
before a 29.1 inch low moves eastward just north of Lake Superior
on Friday. The region will then be dominated by a strengthening
high of 30.1 inches passing through the central United States
Saturday through Monday morning. A developing low pressure system
of 29.1 inches will then push through Manitoba and Ontario and
impact the region Monday night.

LSZ162-232300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
951 AM EST Thu Nov 23 2017 /851 AM CST Thu Nov 23 2017/

.REST OF TODAY...West winds 5 to 15 knots backing southwest by
mid afternoon. Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...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 20 to 30 knots becoming west gales to
35 knots by mid afternoon. A chance of rain showers. Waves
building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots. A slight chance of
rain and snow showers after midnight. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.SATURDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. A chance of snow showers. Waves
subsiding to 1 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots becoming southeast 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming west 15 to
25 knots. Waves building to 1 to 3 feet.

$$

LSZ263-232300-
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-
951 AM EST Thu Nov 23 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH LATE FRIDAY
NIGHT...

.REST OF TODAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves 3 to 5 feet occasionally to
7 feet subsiding to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots increasing to 20 to
30 knots with a few gale force gusts to 35 knots late. Isolated
rain showers after midnight. Waves subsiding to calm to 2 feet,
then building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...Southwest gales to 35 knots veering west by mid
afternoon. A chance of rain showers in the morning, then rain
showers likely in the afternoon. Waves building to 6 to 9 feet
occasionally to 11 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots veering northwest after
midnight. A slight chance of rain and snow showers after
midnight. Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...Northwest winds 15 to 25 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 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots becoming southeast 5 to
15 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots veering west. Waves building
to 2 to 4 feet.

$$

LSZ264-232300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
951 AM EST Thu Nov 23 2017

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH LATE FRIDAY
NIGHT...

.REST OF TODAY...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots by mid afternoon. Waves 3 to 6 feet occasionally to
8 feet subsiding to 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 15 to 25 knots
by midnight, then becoming southwest 20 to 30 knots with a few
gale force gusts to 35 knots late. Isolated snow showers in the
evening. Isolated rain showers. Waves subsiding to calm to 2 feet,
then building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...Southwest gales to 35 knots veering west by mid
afternoon. A chance of rain showers in the morning, then rain
showers likely in the afternoon. Waves building to 7 to 10 feet
occasionally to 13 feet.
.FRIDAY NIGHT...West gales to 35 knots becoming northwest 20 to
30 knots after midnight. A slight chance of rain showers. A
slight chance of snow showers after midnight. Waves subsiding to
5 to 8 feet occasionally to 10 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 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots becoming east 5 to 15 knots.
Waves building to 3 to 6 feet occasionally to 8 feet, then
subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming west 15 to
25 knots. A chance of snow showers. A chance of rain showers.
Waves building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ265-232300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
951 AM EST Thu Nov 23 2017

...GALE WARNING IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY
NIGHT...

.REST OF TODAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves 3 to 5 feet occasionally to
7 feet subsiding to 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots becoming south 15 to
25 knots by midnight, then becoming southwest 20 to 30 knots
late. Isolated rain showers after midnight. Waves subsiding to
calm to 2 feet, then building to 2 to 4 feet.
.FRIDAY...Southwest winds 20 to 30 knots becoming west gales to
35 knots by mid afternoon. A slight chance of rain showers in the
morning, then rain showers likely in the afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.FRIDAY NIGHT...West gales to 35 knots veering northwest after
midnight. A chance of rain showers. A chance of snow showers
after midnight. Waves building to 5 to 8 feet occasionally to
10 feet.
.SATURDAY...Northwest winds 20 to 30 knots with a few gale force
gusts to 35 knots early. A chance of rain showers in the morning.
A chance of snow showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots backing west
after midnight. Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots becoming north 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.MONDAY...South winds 15 to 25 knots becoming west 20 to
30 knots. A chance of rain showers. Waves building to 2 to
4 feet.

$$

LSZ266-232300-
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-
951 AM EST Thu Nov 23 2017

...GALE WARNING IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY
NIGHT...

.REST OF TODAY...West winds 15 to 25 knots becoming northwest
10 to 20 knots by mid afternoon. Isolated snow showers. Waves
4 to 7 feet occasionally to 9 feet subsiding to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...West winds 10 to 20 knots becoming south 15 to
25 knots by midnight, then increasing to gales to 35 knots late.
Isolated rain showers, possibly mixed with snow. Waves subsiding
to 1 to 3 feet, then building to 5 to 8 feet occasionally to
10 feet.
.FRIDAY...South winds 20 to 30 knots veering southwest by late
morning, then becoming west gales to 35 knots by mid afternoon. A
chance of rain showers in the morning, then rain showers in the
afternoon. Waves building to 5 to 9 feet occasionally to 11 feet.
.FRIDAY NIGHT...West gales to 35 knots veering northwest after
midnight. A chance of rain showers. A chance of snow showers
after midnight. Waves 7 to 10 feet occasionally to 13 feet.
.SATURDAY...Northwest winds 20 to 30 knots with a few gale force
gusts to 35 knots in the morning. A chance of rain showers in the
morning. A chance of snow showers. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots veering north. Waves building
to 3 to 6 feet occasionally to 8 feet, then subsiding to calm to
2 feet.
.MONDAY...South winds 15 to 25 knots becoming west 20 to
30 knots. A chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ267-232300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
951 AM EST Thu Nov 23 2017

...GALE WARNING IN EFFECT FROM FRIDAY MORNING THROUGH LATE FRIDAY
NIGHT...

.REST OF TODAY...West winds 20 to 30 knots becoming northwest
15 to 25 knots by mid afternoon. Scattered snow showers, possibly
mixed with rain. Waves 4 to 7 feet occasionally to 9 feet
subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...West winds 10 to 20 knots becoming south 15 to
25 knots by midnight, then increasing to 20 to 30 knots late.
Scattered snow showers. Scattered rain showers after midnight.
Waves subsiding to 1 to 3 feet, then building to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY...South gales to 35 knots veering southwest. A chance of
rain showers in the morning, then rain showers 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. Rain showers likely in the evening, then a chance of
rain showers, possibly mixed with snow after midnight. Waves
building to 8 to 11 feet occasionally to 14 feet.
.SATURDAY...Northwest winds 20 to 30 knots with a few gale force
gusts to 35 knots in the morning. Snow showers, possibly mixed
with rain in the morning, then a chance of snow showers in the
afternoon. Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. A chance of snow showers, possibly mixed with rain.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots increasing to 20 to
30 knots. A chance of rain showers. Waves building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ261-232300-
MAFOR 2316/
Superior West...Gale Warning in effect...11620 11610 11510 11520
11530 13540. Chance of rain showers Friday morning. Waves 1 to 3
feet this afternoon,building to 3 to 7 feet tonight through
Friday morning.

Superior North Central...Gale Warning in effect...11730 11720
11600 11510 11430 11530 11540 11550. Chance of rain showers
Friday morning. Waves 1 to 5 this afternoon. Waves 1 to 3 feet
building to 3 to 6 feet tonight. Waves 5 to 9 feet Friday morning.

Superior South Central...Gale Warning in effect...11630 11730
11620 11510 12430 12540. Waves 1 to 5 feet this afternoon and
tonight. Waves 3 to 6 feet Friday morning.

Superior East...Gale Warning in effect...11630 11730 11720 11610
11530 12440 11540. Scattered snow and rain showers late this
morning. Scattered rain and snow showers after midnight.
Chance of rain showers Friday morning. Waves 3 to 7 feet this
afternoon through tonight. Waves 5 to 9 feet Friday morning.

$$

KCW

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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