Great Lakes Forecast
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FZUS63 KMQT 212034
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
334 PM EST Tue Nov 21 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 29.2 inch low pressure just south of James Bay this
afternoon will continue to push off to the northeast, while a 30.5
inch high over northeast Montana will drift south into the Central
Plains Wednesday morning and weaken to 30.2 inches as it broadens
over the Ohio Valley and Southern Plains on Wednesday night. On
Thursday morning, a 29.9 inch trough will settle south across the
Upper Great Lakes. A 30.0 inch ridge will then move over the Upper
Great Lakes Thursday night and into the Lower Great Lakes on Friday
morning. Meanwhile a 29.0 inch low will move to Lake Winnipeg and
track east across central and eastern Ontario Friday evening. A 30.2
inch ridge will move into the northern plains on Saturday, reaching
the Ohio Valley on Sunday.

LSZ162-220445-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
334 PM EST Tue Nov 21 2017 /234 PM CST Tue Nov 21 2017/

...GALE WARNING IN EFFECT UNTIL 5 PM EST /4 PM CST/ THIS
AFTERNOON...

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots with a few
gale force gusts to 35 knots early. Isolated snow showers. Waves
4 to 7 feet occasionally to 9 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots by midnight, then becoming west 10 to 20 knots late.
Waves subsiding to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots increasing to 15 to
25 knots by late morning, then backing southwest by mid
afternoon. Scattered snow showers in the afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 knots veering west by
midnight. A chance of snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet, then subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots. A 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.
.FRIDAY NIGHT...West winds 20 to 30 knots increasing to gales to
35 knots 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 diminishing to 15 to
25 knots. A chance of snow showers. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.

$$

LSZ263-220445-
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-
334 PM EST Tue Nov 21 2017

...GALE WARNING IN EFFECT UNTIL 5 PM EST THIS AFTERNOON...

.LATE THIS AFTERNOON...Northwest winds 20 to 30 knots with a few
gale force gusts to 35 knots early. Scattered snow showers. Waves
5 to 8 feet occasionally to 10 feet.
.TONIGHT...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots late. Isolated snow showers. Waves subsiding to 2 to
4 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. Isolated snow showers. Waves building
to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 knots veering west by
midnight. A chance of snow showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots increasing to 20 to 30
knots. Rain showers likely in the afternoon. Waves building to 4
to 7 feet occasionally to 9 feet.
.FRIDAY NIGHT...West gales to 35 knots. A chance of rain showers.
A chance of snow showers after midnight. Waves building to 7 to
10 feet occasionally to 13 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 15 to
25 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.

$$

LSZ264-220445-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
334 PM EST Tue Nov 21 2017

...GALE WARNING IN EFFECT UNTIL 10 PM EST THIS EVENING...

.LATE THIS AFTERNOON...Northwest gales to 35 knots. Scattered
snow showers. Waves 8 to 11 feet occasionally to 14 feet
subsiding to 7 to 10 feet occasionally to 13 feet.
.TONIGHT...Northwest winds 20 to 30 knots with a few gale force
gusts to 35 knots diminishing to 10 to 20 knots late. Scattered
snow showers. Waves subsiding to 3 to 5 feet occasionally to 7
feet.
.WEDNESDAY...West winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Isolated snow showers. Waves subsiding
to 2 to 4 feet, then building to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 knots veering west by
midnight. A chance of snow showers. Waves building to 4 to 8 feet
occasionally to 10 feet.
.THURSDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. A slight chance of snow showers in the
morning. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots increasing to 15 to
25 knots after midnight. A chance of rain and snow showers. Waves
subsiding to calm to 2 feet, then building to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots. Rain showers likely in
the afternoon. Waves building to 4 to 7 feet occasionally to
9 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots increasing to gales to
35 knots after midnight. A chance of rain showers. A chance of
snow showers after midnight. Waves building to 9 to 12 feet
occasionally to 15 feet.
.SATURDAY...Northwest gales to 40 knots diminishing to 15 to
25 knots late. A chance of snow showers. Waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest. A chance
of snow showers. Waves subsiding to calm to 2 feet, then building
to 2 to 4 feet.

$$

LSZ265-220445-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
334 PM EST Tue Nov 21 2017

...GALE WARNING IN EFFECT UNTIL 10 PM EST THIS EVENING...

.LATE THIS AFTERNOON...Northwest gales to 35 knots. Numerous snow
showers. Waves 8 to 11 feet occasionally to 14 feet subsiding to
7 to 10 feet occasionally to 13 feet.
.TONIGHT...Northwest gales to 35 knots diminishing to 15 to
25 knots. Scattered snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...West winds 15 to 25 knots backing southwest by mid
afternoon. Isolated snow showers. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots by midnight. A slight chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 20 to 30 knots becoming northwest 10 to
20 knots in the afternoon. A slight chance of 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 after midnight. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.FRIDAY...Southwest winds 20 to 30 knots. A chance of rain
showers in the afternoon. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots increasing to gales to
35 knots after midnight. A chance of rain and snow showers late.
Waves building to 7 to 10 feet occasionally to 13 feet.
.SATURDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots. Snow showers. Waves building to 9 to 12 feet
occasionally to 15 feet, then subsiding to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots backing southwest. A chance
of snow showers. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.

$$

LSZ266-220445-
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-
334 PM EST Tue Nov 21 2017

...GALE WARNING IN EFFECT UNTIL 10 PM EST THIS EVENING...

.LATE THIS AFTERNOON...Northwest gales to 40 knots. Numerous snow
showers. Waves 11 to 15 feet occasionally to 19 feet subsiding to
10 to 14 feet occasionally to 18 feet.
.TONIGHT...Northwest gales to 35 knots diminishing to 20 to
30 knots late. Scattered snow showers. Waves subsiding to 4 to
7 feet occasionally to 9 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots backing southwest by
mid afternoon. Scattered snow showers. Waves subsiding to 2 to
4 feet, then building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 knots increasing to
20 to 30 knots by midnight, then veering west late. A chance of
snow showers. Waves building to 4 to 8 feet occasionally to
10 feet.
.THURSDAY...West winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon. A chance of snow showers, possibly
mixed with rain in the morning. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots becoming south
15 to 25 knots after midnight. A chance of rain and snow showers
late. Waves subsiding to 1 to 3 feet, then building to 2 to 4
feet.
.FRIDAY...South winds 20 to 30 knots. Rain showers likely in the
afternoon. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.FRIDAY NIGHT...West winds 20 to 30 knots increasing to gales to
35 knots after midnight. Rain and snow showers likely. Waves
building to 10 to 14 feet occasionally to 18 feet.
.SATURDAY...Northwest gales to 40 knots diminishing to 20 to
30 knots. Snow showers likely. Waves building to 12 to 17 feet
occasionally to 21 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...Northwest winds 15 to 25 knots backing southwest. Snow
showers likely. Waves subsiding to 1 to 3 feet.

$$

LSZ267-220445-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
334 PM EST Tue Nov 21 2017

...GALE WARNING IN EFFECT UNTIL 10 PM EST THIS EVENING...

.LATE THIS AFTERNOON...Northwest gales to 40 knots. Numerous snow
showers. Waves 11 to 15 feet occasionally to 19 feet subsiding to
10 to 14 feet occasionally to 18 feet.
.TONIGHT...Northwest gales to 35 knots diminishing to 15 to
25 knots. Numerous snow showers. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots backing west.
Scattered snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 knots increasing to
20 to 30 knots by midnight, then veering west late. A chance of
snow showers. Waves building to 3 to 6 feet occasionally to
8 feet.
.THURSDAY...West winds 20 to 30 knots veering northwest in the
afternoon. A chance of snow showers, possibly mixed with rain.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots becoming south 15 to
25 knots after midnight. A chance of rain and snow showers late. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...South gales to 35 knots veering southwest late. Rain
showers likely. Waves building to 4 to 7 feet occasionally to 9
feet.
.FRIDAY NIGHT...Southwest gales to 35 knots veering west after
midnight. Rain and snow showers. Waves building to 10 to 14 feet
occasionally to 18 feet.
.SATURDAY...Northwest gales to 40 knots diminishing to 20 to
30 knots. Snow showers likely. Waves building to 12 to 17 feet
occasionally to 21 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet.

$$

LSZ261-220445-
MAFOR 2122/
Superior West 13740 11730 12620 11630 11530. Waves 4 to 7 feet
tonight subsiding to 2 to 4 feet Wednesday.

Superior North Central...Gale Warning in effect...11750 12740
11730 11720 12620 11630. Scattered snow showers this evening.
Waves 6 to 10 feet subsiding to 3 to 6 feet tonight.

Superior South Central...Gale Warning in effect...11757 12740
12730 11620 11630 11620. Scattered snow showers through Wednesday
morning. Waves 9 to 13 feet subsiding to 5 to 8 feet tonight, and
then subsiding to 2 to 4 feet Wednesday.

Superior East...Gale Warning in effect...11757 12740 11730 12720
12620. Scattered snow showers through Wednesday morning. Waves 10
to 14 feet subsiding to 5 to 9 feet tonight, and then subsiding to
3 to 5 feet Wednesday.

$$

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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