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National Weather Service Marine Forecast FZUS63 KMQT

FZUS63 KMQT 180236
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
936 PM EST Sun Dec 17 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 high of 30.4 inches centered over the Saint
Lawrence Valley and New England will lead to weak ridging of 30.1
inches over Lake Superior through Monday morning. Late Monday and
into Tuesday, a 29.5 inch trough will move through the Upper
Great Lakes. A high of 30.2 inches over the central Plains will
follow on Wednesday before a strengthening low pressure of 29.5
inches tracks out of the Rockies and into the Plains on Thursday.
The low is expected to reach the lower Great Lakes on Friday
morning at 29.7 inches and then track northeast across the Lower
Peninsula through Friday and crossing Lake Huron on Friday night.

LSZ162-181045-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
936 PM EST Sun Dec 17 2017 /836 PM CST Sun Dec 17 2017/

...GALE WATCH IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
EVENING...

REST OF TONIGHT
Southwest winds 10 to 20 knots. Waves 2 to 4
feet building to 3 to 6 feet occasionally to 8 feet.

MONDAY
Southwest winds 20 to 30 knots. A chance of rain and
snow in the afternoon. Waves building to 5 to 8 feet occasionally
to 10 feet.

MONDAY NIGHT
Southwest winds 20 to 30 knots with a few gale
force gusts to 35 knots veering west after midnight. A chance of
rain and snow showers in the evening. Waves subsiding to 4 to 7
feet occasionally to 9 feet.

TUESDAY
West winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. A chance of snow showers. Waves
building to 5 to 8 feet occasionally to 10 feet.

TUESDAY NIGHT
Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet.

WEDNESDAY
Northwest winds 10 to 20 knots becoming north 5 to
15 knots in the afternoon. A chance of snow showers in the
afternoon. Waves subsiding to calm to 2 feet.

WEDNESDAY NIGHT
East winds 5 to 15 knots. Snow showers likely.
Waves building to 1 to 3 feet.

THURSDAY
Northeast winds 10 to 20 knots. A chance of snow
showers. Waves building to 4 to 7 feet occasionally to 9 feet.

FRIDAY
Northeast winds 10 to 20 knots backing northwest. Snow
showers likely. Waves subsiding to 2 to 4 feet.



LSZ263-181045-
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-
936 PM EST Sun Dec 17 2017

...GALE WATCH IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
EVENING...

REST OF TONIGHT
Southwest winds 15 to 25 knots. Waves 2 to 4
feet building to 3 to 6 feet occasionally to 8 feet.

MONDAY
Southwest winds 20 to 30 knots. A chance of rain,
possibly mixed with snow in the afternoon. Waves building to 6 to
9 feet occasionally to 11 feet.

MONDAY NIGHT
Southwest winds 20 to 30 knots with a few gale
force gusts to 35 knots veering west after midnight. Rain and
snow showers likely. Waves building to 6 to 10 feet occasionally
to 13 feet.

TUESDAY
West gales to 35 knots. A chance of snow showers.
Waves building to 8 to 11 feet occasionally to 14 feet.

TUESDAY NIGHT
Northwest gales to 35 knots diminishing to 15 to
25 knots after midnight. A chance of snow showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.

WEDNESDAY
Northwest winds 10 to 20 knots becoming north 5 to
15 knots in the afternoon. Waves subsiding to calm to 2 feet.

WEDNESDAY NIGHT
Northeast winds 5 to 15 knots veering east
after midnight. Snow showers likely. Waves calm to 2 feet.

THURSDAY
Northeast winds 10 to 20 knots. A chance of snow
showers. Waves building to 4 to 7 feet occasionally to 9 feet.

FRIDAY
Northeast winds 10 to 20 knots backing north. Snow
showers likely. Waves subsiding to 3 to 5 feet occasionally to 7
feet.



LSZ264-181045-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
936 PM EST Sun Dec 17 2017

...GALE WATCH IN EFFECT FROM LATE MONDAY NIGHT THROUGH LATE
TUESDAY NIGHT...

REST OF TONIGHT
Southwest winds 15 to 25 knots. Waves 3 to 6
feet occasionally to 8 feet.

MONDAY
Southwest winds 20 to 30 knots. Rain likely, possibly
mixed with snow in the afternoon. Waves building to 6 to 10 feet
occasionally to 13 feet.

MONDAY NIGHT
Southwest gales to 35 knots becoming west after
midnight. Rain and snow showers likely. Waves building to 7 to 10
feet occasionally to 13 feet.

TUESDAY
West gales to 35 knots. A chance of snow showers.
Waves building to 9 to 12 feet occasionally to 15 feet.

TUESDAY NIGHT
Northwest gales to 35 knots diminishing to 20 to
30 knots after midnight. Freezing spray. Snow showers likely.
Waves subsiding to 4 to 7 feet occasionally to 9 feet.

WEDNESDAY
Northwest winds 15 to 25 knots diminishing to 5 to
15 knots in the afternoon. Waves subsiding to 1 to 3 feet.

WEDNESDAY NIGHT
North winds 5 to 15 knots veering northeast
after midnight. A chance of snow showers. Waves subsiding to calm
to 2 feet.

THURSDAY
Northeast winds 5 to 15 knots increasing to 10 to
20 knots. A chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.

FRIDAY
East winds 10 to 20 knots becoming north 15 to
25 knots. Snow showers likely. Freezing spray. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.



LSZ265-181045-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
936 PM EST Sun Dec 17 2017

...GALE WATCH IN EFFECT FROM LATE MONDAY NIGHT THROUGH LATE
TUESDAY NIGHT...

REST OF TONIGHT
West winds 10 to 20 knots turning southwest
late. A slight chance of freezing rain and snow. Waves 1 to 3
feet.

MONDAY
Southwest winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of rain and snow in the
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.

MONDAY NIGHT
Southwest gales to 35 knots veering west after
midnight. Rain and snow showers likely. Waves building to 4 to 7
feet occasionally to 9 feet.

TUESDAY
West gales to 35 knots. A chance of snow showers.
Waves building to 7 to 10 feet occasionally to 13 feet.

TUESDAY NIGHT
Northwest gales to 35 knots. Snow showers
likely. Waves subsiding to 4 to 7 feet occasionally to 9 feet.

WEDNESDAY
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.

WEDNESDAY NIGHT
North winds 5 to 15 knots veering east after
midnight. A chance of snow showers. Waves subsiding to calm to 2
feet.

THURSDAY
East winds 10 to 20 knots increasing to 15 to
25 knots. Snow showers likely. Waves building to 3 to 6 feet
occasionally to 8 feet.

FRIDAY
East winds 15 to 25 knots becoming north 20 to
30 knots. Snow showers likely. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.



LSZ266-181045-
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-
936 PM EST Sun Dec 17 2017

...GALE WATCH IN EFFECT FROM LATE MONDAY NIGHT THROUGH LATE
TUESDAY NIGHT...

REST OF TONIGHT
Southwest winds 10 to 20 knots increasing to 15
to 25 knots late. A slight chance of rain and snow. Patchy fog.
Waves 3 to 6 feet occasionally to 8 feet.

MONDAY
Southwest winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Rain likely, possibly mixed with snow
in the afternoon. Waves building to 6 to 9 feet occasionally to
11 feet.

MONDAY NIGHT
Southwest gales to 35 knots veering west by
midnight. Rain and snow showers likely. Waves subsiding to 5 to 8
feet occasionally to 10 feet.

TUESDAY
West gales to 35 knots. A chance of rain and snow
showers. Waves building to 10 to 14 feet occasionally to 18 feet.

TUESDAY NIGHT
Northwest gales to 35 knots. Snow showers
likely. Freezing spray after midnight. Waves subsiding to 7 to 10
feet occasionally to 13 feet.

WEDNESDAY
Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Freezing spray in the morning. A
chance of snow showers. Waves subsiding to 2 to 4 feet.

WEDNESDAY NIGHT
North winds 5 to 15 knots veering east after
midnight. A chance of snow showers. Waves subsiding to calm to 2
feet.

THURSDAY
East winds 5 to 15 knots increasing to 15 to
25 knots. A chance of snow showers. Waves building to 3 to 6 feet
occasionally to 8 feet.

FRIDAY
East winds 15 to 25 knots becoming north 20 to
30 knots. Snow showers likely. Waves building to 4 to 7 feet
occasionally to 9 feet.



LSZ267-181045-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
936 PM EST Sun Dec 17 2017

...GALE WATCH IN EFFECT FROM LATE MONDAY NIGHT THROUGH LATE
TUESDAY NIGHT...

REST OF TONIGHT
South winds 15 to 25 knots veering southwest
by midnight, then becoming west 10 to 20 knots late. A chance of
snow, possibly mixed with freezing rain. Patchy fog. Waves 1 to 4
feet.

MONDAY
Southwest winds 10 to 20 knots increasing to 20 to 30
knots in the afternoon. Rain and snow likely in the afternoon.
Waves building to 3 to 6 feet occasionally to 8 feet.

MONDAY NIGHT
Southwest gales to 35 knots veering west late.
Snow showers, possibly mixed with rain. Waves building to 7 to
10 feet occasionally to 13 feet.

TUESDAY
West gales to 35 knots. A chance of rain and snow
showers. Waves building to 10 to 14 feet occasionally to 18 feet.

TUESDAY NIGHT
Northwest gales to 35 knots. Snow showers
likely. Freezing spray after midnight. Waves building to 11 to 15
feet occasionally to 19 feet, then subsiding to 7 to 10 feet
occasionally to 13 feet.

WEDNESDAY
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.

WEDNESDAY NIGHT
North winds 10 to 20 knots veering east after
midnight. A chance of snow showers. Waves subsiding to calm to 2
feet.

THURSDAY
Southeast winds 10 to 20 knots becoming east 15 to
25 knots. Snow showers, then a chance of snow showers. Waves
building to 3 to 5 feet occasionally to 7 feet.

FRIDAY
East winds 15 to 25 knots backing north. Snow showers
likely. Waves building to 3 to 6 feet occasionally to 8 feet.


LSZ261-181045-
MAFOR 1804/
Superior West 11630 12530 13540 11547 11540. Chance of rain and
snow. Waves 2 to 5 feet overnight building to 5 to 8 feet Monday.

Superior North Central 12630 11530 13540 11547 11547. Patchy fog
through mid morning. Chance of rain late Monday. Waves 3 to 6 feet
overnight building to 6 to 10 feet Monday.

Superior South Central 13620 12520 11530 12547. Chance of rain
and snow showers through late Monday evening. Waves 1 to 3 feet
overnight building to 3 to 5 feet Monday.

Superior East 11520 11620 13520 11530 12547. Patchy fog through
mid morning. Waves 2 to 4 feet overnight building to 5 to 8 feet
Monday evening.



Borchardt

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

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