Great Lakes Forecast
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FZUS63 KMQT 160310
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1010 PM EST Wed Nov 15 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 29.5 inch low near Drummond Island will track
across Georgian Bay tonight. This low will continue to track over
southern Quebec on Thursday as a 30.3 inch ridge drifts across
the Upper Great Lakes. This ridge will continue eastward ahead of
another 29.5 inch trough that will cross the Upper Great Lakes
Friday night. This trough will move eastward through the weekend
while a 30.0 inch ridge gradually builds across the region by
Sunday. A 29.4 inch trough will move through Alberta and
Saskatchewan towards the Upper Great Lakes on Monday.

LSZ162-161115-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1010 PM EST Wed Nov 15 2017 /910 PM CST Wed Nov 15 2017/

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

$$

LSZ263-161115-
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-
1010 PM EST Wed Nov 15 2017

...GALE WARNING IN EFFECT UNTIL 4 AM EST THURSDAY...

.REST OF TONIGHT...North gales to 40 knots. Scattered snow
showers. Waves 7 to 10 feet occasionally to 13 feet building to
9 to 12 feet occasionally to 15 feet, then subsiding to 7 to
10 feet occasionally to 13 feet.
.THURSDAY...Northeast winds 20 to 30 knots diminishing to 10 to
20 knots by late morning, then veering east by mid afternoon.
Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Southeast winds 15 to 25 knots becoming south
20 to 30 knots late. A chance of snow, possibly mixed with rain
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet.
.FRIDAY...South winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. A chance of snow in the morning. Rain.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots becoming northwest 10 to
20 knots after midnight. A chance of rain. Waves subsiding to
1 to 3 feet.
.SATURDAY...Northwest winds 15 to 25 knots. Waves building to
3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots. Snow showers
likely in the evening, then a chance of snow showers after
midnight. Waves 3 to 5 feet occasionally to 7 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.
.MONDAY...Southwest winds 10 to 20 knots veering west. A chance
of snow showers. Waves subsiding to calm to 2 feet, then building
to 3 to 5 feet occasionally to 7 feet.

$$

LSZ264-161115-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1010 PM EST Wed Nov 15 2017

...GALE WARNING IN EFFECT UNTIL 7 AM EST THURSDAY...

.REST OF TONIGHT...North gales to 40 knots. Scattered snow
showers. Waves 8 to 11 feet occasionally to 14 feet building to
10 to 14 feet occasionally to 18 feet, then subsiding to 9 to
12 feet occasionally to 15 feet.
.THURSDAY...North winds 20 to 30 knots becoming northeast 15 to
25 knots by late morning, then becoming east 5 to 15 knots by mid
afternoon. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots increasing to
15 to 25 knots by midnight, then becoming south 20 to 30 knots
late. A chance of snow, possibly mixed with freezing rain after
midnight. Waves building to 6 to 9 feet occasionally to 11 feet.
.FRIDAY...South gales to 40 knots. A chance of snow in the
morning. Rain. Waves building to 9 to 12 feet occasionally to
15 feet, then subsiding to 6 to 9 feet occasionally to 11 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots veering northwest
after midnight. Rain likely in the evening, then a chance of rain
after midnight. Waves subsiding to 2 to 4 feet.
.SATURDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots. Snow showers
likely. Freezing spray after midnight. Waves building to 6 to
9 feet occasionally to 11 feet.
.SUNDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots. Waves building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ265-161115-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1010 PM EST Wed Nov 15 2017

...GALE WARNING IN EFFECT UNTIL 7 AM EST THURSDAY...

.REST OF TONIGHT...North gales to 40 knots. Snow showers becoming
scattered. Rain showers through midnight. Waves 7 to 10 feet
occasionally to 13 feet building to 12 to 17 feet occasionally to
21 feet, then subsiding to 11 to 15 feet occasionally to 19 feet.
.THURSDAY...North winds 20 to 30 knots becoming northeast 15 to
25 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...Southeast winds 10 to 20 knots increasing to
15 to 25 knots by midnight, then becoming south gales to 35 knots
late. A slight chance of snow after midnight. Waves subsiding to
1 to 3 feet, then building to 5 to 8 feet occasionally to
10 feet.
.FRIDAY...South gales to 40 knots. A chance of snow in the
morning. Rain. Waves building to 7 to 10 feet occasionally to
13 feet, then subsiding to 5 to 8 feet occasionally to 10 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. Rain likely in the evening, then a
chance of rain after midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...Northwest winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. A chance of rain showers in the
morning. A chance of snow showers. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY NIGHT...Northwest gales to 35 knots. Snow showers
likely. Waves building to 6 to 9 feet occasionally to 11 feet.
.SUNDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots. Snow showers likely, then a chance of snow showers.
Waves subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming west 20 to
30 knots. Waves subsiding to calm to 2 feet, then building to
3 to 5 feet occasionally to 7 feet.

$$

LSZ266-161115-
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-
1010 PM EST Wed Nov 15 2017

...GALE WARNING IN EFFECT THROUGH THURSDAY MORNING...

.REST OF TONIGHT...North gales to 45 knots. Rain showers, snow
showers and drizzle late in the evening, then scattered snow
showers, possibly mixed with rain and drizzle after midnight.
Waves 8 to 11 feet occasionally to 14 feet building to 15 to
20 feet occasionally to 25 feet, then subsiding to 12 to 17 feet
occasionally to 21 feet.
.THURSDAY...North gales to 35 knots diminishing to 15 to 25 knots
by late morning, then becoming northeast 10 to 20 knots by mid
afternoon. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots becoming southeast
15 to 25 knots by midnight, then becoming south 20 to 30 knots
late. A slight chance of snow, possibly mixed with rain after
midnight. Waves subsiding to 1 to 3 feet, then building to 6 to
9 feet occasionally to 11 feet.
.FRIDAY...South gales to 40 knots. A chance of snow in the
morning. Rain. Waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 8 to 11 feet occasionally to 14 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. Rain in the evening, then a chance
of rain after midnight. Waves subsiding to 2 to 4 feet.
.SATURDAY...Northwest winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. A chance of rain and snow showers.
Waves building to 7 to 10 feet occasionally to 13 feet.
.SATURDAY NIGHT...Northwest gales to 40 knots. Snow showers
likely. Waves building to 8 to 12 feet occasionally to 15 feet.
.SUNDAY...Northwest gales to 35 knots diminishing to 15 to
25 knots. Snow showers likely, then a chance of snow showers.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.MONDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots. Waves subsiding to 2 to 4 feet, then building to 3 to
6 feet occasionally to 8 feet.

$$

LSZ267-161115-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1010 PM EST Wed Nov 15 2017

...GALE WARNING IN EFFECT THROUGH THURSDAY MORNING...

.REST OF TONIGHT...North winds 15 to 25 knots increasing to gales
to 45 knots by midnight. Drizzle and numerous rain showers late
in the evening. Scattered snow showers. A chance of drizzle and
scattered rain showers after midnight. Waves 2 to 4 feet building
to 10 to 14 feet occasionally to 18 feet.
.THURSDAY...North gales to 40 knots diminishing to 15 to
25 knots. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...East winds 10 to 20 knots becoming southeast
15 to 25 knots by midnight, then increasing to 20 to 30 knots
late. Waves subsiding to 1 to 3 feet, then building to 3 to
6 feet occasionally to 8 feet.
.FRIDAY...Southeast gales to 35 knots becoming south gales to
40 knots in the afternoon. A chance of snow, possibly mixed with
rain in the morning, then rain, possibly mixed with snow in the
afternoon. Waves building to 6 to 9 feet occasionally to 11 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots becoming northwest
10 to 20 knots after midnight. Rain. Waves subsiding to 1 to
3 feet.
.SATURDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Rain showers likely in the morning,
then a chance of rain and snow showers in the afternoon. Waves
building to 6 to 9 feet occasionally to 11 feet.
.SATURDAY NIGHT...North gales to 35 knots. Snow showers likely.
Waves building to 8 to 11 feet occasionally to 14 feet.
.SUNDAY...Northwest gales to 35 knots diminishing to 15 to
25 knots. Snow showers likely, then a chance of snow showers.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.MONDAY...Southwest winds 15 to 25 knots. Waves subsiding to 2 to
4 feet, then building to 3 to 6 feet occasionally to 8 feet.

$$
LSZ261-161115-
MAFOR 1604/
Superior West...Gale Warning in effect...11850 11840 11830 11130
11120 11220 11320 11330. Waves 4 to 9 feet overnight subsiding to
2 to 4 feet Thursday and Thursday evening.

Superior North Central...Gale Warning in effect...13850 11840
11130 11110 11210 11320. Scattered snow showers overnight. Waves
10 to 14 feet overnight subsiding to 2 to 5 feet Thursday and
Thursday evening.

Superior South Central...Gale Warning in effect...11867 13850
11830 11120 11110 11320. Scattered snow showers with a chance of
drizzle late overnight. Waves 9 to 12 feet building to 12 to 17
feet overnight. Waves 10 to 15 feet subsiding to 4 to 7 feet
Thursday. Waves subsiding to 2 to 5 feet Thursday evening.

Superior East...Gale Warning in effect...11857 13850 11840 11830
11120 11210. Scattered snow showers with a chance of drizzle
overnight. Waves 5 to 8 feet building to 10 to 14 feet overnight.
Waves 10 to 13 feet subsiding to 2 to 5 feet Thursday and Thursday
evening.

$$

JSS

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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