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National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 120300
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1000 PM EST Wed Dec 11 2019

For waters beyond 5 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 30.5 inch ridge of high pressure will drop south
from the Canadian Prairies into the Ohio River Valley tonight.
This high pressure will strengthen to 30.7 inches on Thursday as
it moves east into the mid-Atlantic. Meanwhile, a 29.9 inch low
pressure system will develop across the Plains as it moves east
across the Upper Great Lakes Thursday evening through Friday. A
trough of 29.8 inches will remain over the lake Friday evening
into Saturday as 29.6 inch low pressure traverses east from the
Plains into New England by Saturday evening. On Sunday, a 30.2
inch high pressure will move over the Upper Great Lakes through
Monday.

LSZ162-121100-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1000 PM EST Wed Dec 11 2019 /900 PM CST Wed Dec 11 2019/

REST OF TONIGHT
West winds 10 to 20 knots becoming southwest
5 to 15 knots late. Freezing spray late in the evening. Isolated
snow showers late in the evening, then snow likely after
midnight. Waves 3 to 5 feet occasionally to 7 feet subsiding to
calm to 2 feet.

THURSDAY
Southeast winds 5 to 15 knots becoming east 10 to
20 knots. Snow likely in the morning, then a chance of snow in
the afternoon. Waves building to 2 to 4 feet.

THURSDAY NIGHT
East winds 15 to 25 knots becoming northeast
10 to 20 knots by midnight, then veering east late. A chance of
snow showers. A slight chance of freezing drizzle after midnight.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.

FRIDAY
Southeast winds 5 to 15 knots. A chance of snow showers
and a slight chance of freezing drizzle in the morning, then snow
showers likely in the afternoon. Waves subsiding to calm to
2 feet.

FRIDAY NIGHT
Southwest winds 5 to 15 knots veering northwest
after midnight. Snow showers. Waves calm to 2 feet.

SATURDAY
Northwest winds 10 to 20 knots veering north in the
afternoon. Snow showers likely in the morning, then a chance of
snow showers in the afternoon. Waves building to 2 to 4 feet.

SATURDAY NIGHT
North winds 10 to 20 knots. Freezing spray in
the evening. A chance of snow showers. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 1 to 3 feet.

SUNDAY
Northwest winds 5 to 15 knots backing west. Waves 1 to
3 feet.

MONDAY
West winds 5 to 15 knots. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.



LSZ263-121100-
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-
1000 PM EST Wed Dec 11 2019

REST OF TONIGHT
West winds 15 to 25 knots becoming southwest
10 to 20 knots late. Freezing spray. Scattered snow showers late
in the evening. Snow likely after midnight. Waves 5 to 8 feet
occasionally to 10 feet subsiding to 2 to 4 feet.

THURSDAY
South winds 10 to 20 knots backing east by mid
afternoon. Snow likely in the morning, then a chance of snow in
the afternoon. Waves subsiding to calm to 2 feet, then building
to 2 to 4 feet.

THURSDAY NIGHT
East winds 10 to 20 knots. A chance of snow
showers. A slight chance of freezing drizzle after midnight.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.

FRIDAY
East winds 5 to 15 knots veering southeast in the
afternoon. A chance of snow showers and a slight chance of
freezing drizzle in the morning, then snow showers likely in the
afternoon. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.

FRIDAY NIGHT
East winds 5 to 15 knots becoming northeast 10 to
20 knots after midnight. Snow showers likely. Waves building to
2 to 4 feet, then subsiding to 1 to 3 feet.

SATURDAY
North winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Snow showers likely. Waves building to
3 to 5 feet occasionally to 7 feet.

SATURDAY NIGHT
North winds 15 to 25 knots. Freezing spray. A
chance of snow showers. Waves 3 to 5 feet occasionally to 7 feet.

SUNDAY
Northwest winds 10 to 20 knots becoming west 15 to
25 knots. Freezing spray. A chance of snow showers. Waves
subsiding to 2 to 4 feet.

MONDAY
West winds 10 to 20 knots. Freezing spray. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.



LSZ264-121100-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1000 PM EST Wed Dec 11 2019

REST OF TONIGHT
Northwest winds 15 to 25 knots diminishing to
10 to 20 knots by midnight. Freezing spray. A chance of snow
showers. Waves 5 to 8 feet occasionally to 10 feet subsiding to
2 to 4 feet.

THURSDAY
North winds 5 to 15 knots veering east by late
morning, then increasing to 10 to 20 knots by mid afternoon. Snow
likely in the morning, then a chance of snow in the afternoon.
Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.

THURSDAY NIGHT
Northeast winds 10 to 20 knots veering east by
midnight, then diminishing to 5 to 15 knots late. A chance of
snow showers. A slight chance of freezing drizzle after midnight.
Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.

FRIDAY
East winds 5 to 15 knots. A slight chance of freezing
drizzle in the morning. A chance of snow showers. Waves building
to 2 to 4 feet.

FRIDAY NIGHT
East winds 5 to 15 knots backing northeast after
midnight. Snow showers likely. Waves subsiding to 1 to 3 feet.

SATURDAY
Northeast winds 10 to 20 knots becoming north 15 to
25 knots in the afternoon. Snow showers likely. Freezing spray in
the afternoon. Waves building to 3 to 5 feet occasionally to
7 feet.

SATURDAY NIGHT
North winds 15 to 25 knots. Freezing spray.
Snow showers likely in the evening. A chance of snow showers
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.

SUNDAY
Northwest winds 10 to 20 knots. Freezing spray. A
chance of snow showers. Waves subsiding to 2 to 4 feet.

MONDAY
West winds 5 to 15 knots veering northwest. Freezing
spray. Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.



LSZ265-121100-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1000 PM EST Wed Dec 11 2019

REST OF TONIGHT
West winds 20 to 30 knots diminishing to 10 to
20 knots. Freezing spray. Scattered snow showers. Waves 4 to
7 feet occasionally to 9 feet subsiding to 1 to 3 feet.

THURSDAY
Southwest winds 10 to 20 knots backing south by late
morning, then backing east by mid afternoon. Snow likely. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

THURSDAY NIGHT
East winds 10 to 20 knots diminishing to 5 to
15 knots by midnight. A chance of snow showers and a slight
chance of freezing drizzle. Waves subsiding to calm to 2 feet.

FRIDAY
East winds 5 to 15 knots veering southeast in the
afternoon. A chance of freezing drizzle in the morning. A chance
of snow showers. Waves calm to 2 feet.

FRIDAY NIGHT
South winds 5 to 15 knots veering west after
midnight. Snow showers likely. Waves calm to 2 feet.

SATURDAY
West winds 5 to 15 knots becoming north 15 to
25 knots in the afternoon. Snow showers likely. Waves building to
3 to 5 feet occasionally to 7 feet.

SATURDAY NIGHT
North winds 15 to 25 knots. Snow showers
likely. Freezing spray after midnight. Waves building to 4 to
7 feet occasionally to 9 feet.

SUNDAY
Northwest winds 15 to 25 knots becoming west 10 to
20 knots. Freezing spray. A chance of snow showers. Waves
subsiding to calm to 2 feet.

MONDAY
West winds 10 to 20 knots. Waves calm to 2 feet.



LSZ266-121100-
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-
1000 PM EST Wed Dec 11 2019

REST OF TONIGHT
Northwest winds 20 to 30 knots backing west by
midnight, then diminishing to 15 to 25 knots late. Freezing
spray. Scattered snow showers. Waves 9 to 12 feet occasionally to
15 feet subsiding to 3 to 6 feet occasionally to 8 feet.

THURSDAY
Southwest winds 10 to 20 knots backing south by late
morning, then backing east by mid afternoon. Snow. Waves
subsiding to 1 to 3 feet.

THURSDAY NIGHT
East winds 5 to 15 knots. A chance of snow
showers and a slight chance of freezing drizzle. Waves 1 to
3 feet.

FRIDAY
East winds 5 to 15 knots. A slight chance of freezing
drizzle in the morning. A chance of snow showers. Waves subsiding
to calm to 2 feet.

FRIDAY NIGHT
South winds 5 to 15 knots veering southwest after
midnight. Snow showers likely in the evening, then a chance of
snow showers after midnight. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.

SATURDAY
West winds 5 to 15 knots becoming north 10 to
20 knots in the afternoon. A chance of snow showers in the
morning, then snow showers likely in the afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet.

SATURDAY NIGHT
North winds 15 to 25 knots. Freezing spray.
Snow showers likely. Waves building to 5 to 8 feet occasionally
to 10 feet.

SUNDAY
Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Freezing spray. A chance of snow showers. Waves
subsiding to 2 to 4 feet.

MONDAY
West winds 5 to 15 knots. A chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.



LSZ267-121100-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1000 PM EST Wed Dec 11 2019

REST OF TONIGHT
West winds to 20 to 30 knots becoming
southwest late. Freezing spray. Numerous snow showers late in the
evening. Scattered snow showers after midnight. Waves 10 to 14
feet occasionally to 18 feet subsiding to 4 to 7 feet occasionally
to 9 feet.

THURSDAY
Southwest winds 15 to 25 knots backing southeast by
mid afternoon. Snow. Waves subsiding to 1 to 3 feet.

THURSDAY NIGHT
East winds 10 to 20 knots diminishing to 5 to
15 knots late. A chance of snow showers and freezing drizzle.
Waves subsiding to calm to 2 feet.

FRIDAY
East winds 10 to 20 knots veering south in the
afternoon. A chance of snow showers and drizzle in the afternoon.
Waves calm to 2 feet.

FRIDAY NIGHT
South winds 10 to 20 knots. A chance of snow
showers. Waves calm to 2 feet.

SATURDAY
Southwest winds 5 to 15 knots becoming north 10 to
20 knots in the afternoon. A chance of snow showers in the
morning, then snow showers likely in the afternoon. Waves
building to 1 to 3 feet.

SATURDAY NIGHT
North winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Snow showers likely. Freezing spray
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet.

SUNDAY
North winds 20 to 30 knots becoming northwest 15 to
25 knots. Freezing spray. Snow showers likely. A chance of snow
showers. Waves subsiding to 3 to 5 feet occasionally to 7 feet.

MONDAY
West winds 10 to 20 knots. A chance of snow showers.
Waves subsiding to 2 to 4 feet.


LSZ261-121100-
MAFOR 1204/
Superior West 11630 19637 11627 11517 11317 11310 11220 11230
11130. Waves 1 to 5 feet.

Superior North Central 11730 11720 11710 11817 11227 11237 12120.
A chance of snow showers Thursday evening. Waves 4 to 7 feet
subsiding to 3 to 6 feet overnight. Waves 2 to 4 feet Thursday
and Thursday evening.

Superior South Central 11630 19637 11620 11520 11517 11417 11327
11220 11210. Waves 5 to 8 feet subsiding to 3 to 5 feet
overnight. Waves 1 to 4 feet Thursday.

Superior East 11640 19647 11630 19637 11630 11537 11427 11327
11320 11220. Waves 7 to 11 feet subsiding to 5 to 8 feet
overnight. Waves 4 to 7 feet subsiding to 2 to 4 feet through
Thursday evening.



JH

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes