Great Lakes Forecast
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FZUS63 KMQT 080306
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1006 PM EST Thu Dec 7 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 low of 29.7 inches will develop overnight near
eastern Lake Superior and a secondary trough of 29.8 inches will
swing south across the western Great Lakes Friday evening. A high
of 30.3 inches in the central Plains will extend a 30.1 inch
ridge into the upper Midwest late Saturday before two additional
low pressure systems both of 29.7 inches move across the Upper
Great Lakes Sunday and Monday. A high of 30.2 inches will then
build into the Great Lakes Tuesday in advance of several
additional low pressure systems due to pass through late next
week.

LSZ162-081115-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1006 PM EST Thu Dec 7 2017 /906 PM CST Thu Dec 7 2017/

...GALE WARNING IN EFFECT UNTIL MIDNIGHT EST /11 PM CST/
TONIGHT...

.REST OF TONIGHT...West gales to 35 knots diminishing to 20 to
30 knots by midnight, then becoming northwest 15 to 25 knots
late. Isolated snow showers. Waves 4 to 7 feet occasionally to
9 feet subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Scattered snow showers. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots increasing to 20 to
30 knots late. A chance of snow showers. Waves building to 3 to
5 feet occasionally to 7 feet.
.SATURDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon. A slight chance of snow showers. Waves
subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.SUNDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. A chance of snow showers. Waves calm to 2 feet.
.MONDAY...North winds 15 to 25 knots. A chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots becoming north 15 to
25 knots. A chance of snow showers. Waves subsiding to calm to
2 feet.

$$

LSZ263-081115-
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-
1006 PM EST Thu Dec 7 2017

...GALE WARNING IN EFFECT UNTIL MIDNIGHT EST TONIGHT...

.REST OF TONIGHT...West gales to 35 knots veering northwest by
midnight, then diminishing to 20 to 30 knots late. Scattered snow
showers. Waves 8 to 11 feet occasionally to 14 feet subsiding to
3 to 6 feet occasionally to 8 feet.
.FRIDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Scattered snow showers. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots late. Snow showers likely in the evening, then a chance
of snow showers after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon. A chance of snow showers. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
1 to 3 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of snow showers. Waves building
to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northwest winds 15 to 25 knots veering north in the
afternoon. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.SUNDAY NIGHT...North winds 15 to 25 knots becoming northeast
5 to 15 knots after midnight. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.MONDAY...North winds 15 to 25 knots. A chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.TUESDAY...Northwest winds 10 to 20 knots veering north. A chance
of snow showers. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.

$$

LSZ264-081115-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1006 PM EST Thu Dec 7 2017

.REST OF TONIGHT...Northwest winds 20 to 30 knots with a few gale
force gusts to 35 knots diminishing to 15 to 25 knots by
midnight. Scattered snow showers. Freezing spray after midnight.
Waves 7 to 10 feet occasionally to 13 feet subsiding to 3 to 6
feet occasionally to 8 feet.
.FRIDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Freezing spray in the morning.
Scattered snow showers. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots late. Snow showers likely in the evening, then a chance
of snow showers after midnight. Waves subsiding to 1 to 3 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon. A chance of snow showers. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
2 to 4 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of snow showers. Waves building
to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Northwest winds 15 to 25 knots becoming north 20 to
30 knots in the afternoon. A chance of snow showers. Waves 3 to
5 feet occasionally to 7 feet.
.SUNDAY NIGHT...North winds 15 to 25 knots diminishing to 5 to
15 knots after midnight. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.MONDAY...North winds 15 to 25 knots. A chance of snow showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northwest winds 10 to 20 knots veering north. A chance
of snow showers. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.

$$

LSZ265-081115-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1006 PM EST Thu Dec 7 2017

...GALE WARNING IN EFFECT UNTIL MIDNIGHT EST TONIGHT...

.REST OF TONIGHT...West gales to 35 knots diminishing to 20 to
30 knots by midnight, then veering northwest late. Numerous snow
showers late in the evening, then scattered snow showers after
midnight. Waves 4 to 7 feet occasionally to 9 feet subsiding to
3 to 6 feet occasionally to 8 feet.
.FRIDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray in the morning. Scattered snow showers
in the morning, then numerous snow showers in the afternoon.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 2 to 4 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots. Snow showers. Waves
subsiding to 1 to 3 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon. Freezing spray in the morning. Snow
showers likely in the morning, then a chance of snow showers in
the afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.SATURDAY NIGHT...West winds 15 to 25 knots. A chance of snow
showers. Waves subsiding to 2 to 4 feet.
.SUNDAY...West winds 20 to 30 knots veering northwest in the
afternoon. A chance of snow showers. Waves building to 3 to
5 feet occasionally to 7 feet.
.SUNDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Snow showers likely. Waves subsiding to
1 to 3 feet.
.MONDAY...North winds 10 to 20 knots increasing to 20 to
30 knots. Snow showers likely. Freezing spray. Waves subsiding to
calm to 2 feet, then building to 3 to 6 feet occasionally to
8 feet.
.TUESDAY...Northwest winds 15 to 25 knots. A chance of snow
showers. Waves subsiding to 1 to 3 feet.

$$

LSZ266-081115-
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-
1006 PM EST Thu Dec 7 2017

...GALE WARNING IN EFFECT UNTIL MIDNIGHT EST TONIGHT...

.REST OF TONIGHT...West gales to 35 knots diminishing to 20 to 30
knots and veering northwest by midnight. Numerous snow showers.
Waves 6 to 9 feet occasionally to 11 feet building to 7 to 10 feet
occasionally to 13 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.FRIDAY...Northwest winds 15 to 25 knots increasing to 20 to
30 knots by late morning, then diminishing to 15 to 25 knots by
mid afternoon. Freezing spray. Scattered snow showers in the
morning. Numerous snow showers in the afternoon. Waves building
to 5 to 8 feet occasionally to 10 feet, then subsiding to 3 to
6 feet occasionally to 8 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots. Snow showers. Waves
subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon. Freezing spray. A chance of snow
showers. Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots backing west
after midnight. A chance of snow showers in the evening, then
snow showers likely after midnight. Waves 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...West winds 20 to 30 knots veering north in the
afternoon. Snow showers likely in the morning, then a chance of
snow showers in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of snow showers in the evening,
then snow showers likely after midnight. Waves subsiding to 1 to
3 feet.
.MONDAY...North winds 10 to 20 knots increasing to 20 to
30 knots. Snow showers likely, then a chance of snow showers.
Freezing spray. Waves subsiding to calm to 2 feet, then building
to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...North winds 15 to 25 knots veering east. A chance of
snow showers. Waves subsiding to 1 to 3 feet.

$$

LSZ267-081115-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1006 PM EST Thu Dec 7 2017

.REST OF TONIGHT...West winds 20 to 30 knots with a few gale force
gusts to 35 knots becoming northwest 20 to 30 knots late.
Numerous snow showers. Waves 6 to 9 feet occasionally to 11 feet
building to 7 to 10 feet occasionally to 13 feet, then subsiding
to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...Northwest winds 15 to 25 knots. Freezing spray in the
morning. Numerous snow showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots veering northeast by
midnight, then becoming north 15 to 25 knots late. Snow showers
likely. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.SATURDAY...North winds 15 to 25 knots. A chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. A chance of snow showers in the evening, then
snow showers likely after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...West winds 15 to 25 knots becoming northwest 20 to
30 knots in the afternoon. Snow showers likely in the morning,
then a chance of snow showers in the afternoon. Waves building to
3 to 6 feet occasionally to 8 feet.
.SUNDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.MONDAY...North winds 10 to 20 knots increasing to 15 to
25 knots. Snow showers likely. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.TUESDAY...North winds 15 to 25 knots becoming east 10 to
20 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet.

$$
LSZ261-081115-
MAFOR 0804/
Superior West...Gale Warning in effect...11740 19750 11740 12730
13720 11830. Scattered snow showers late this evening and Friday
afternoon and evening. Waves 3 to 7 feet overnight. Waves 1 to 5
feet Friday and Friday evening.

Superior North Central 14740 11730 11720 11820 11827. Freezing
spray and scattered snow showers late tonight through mid
morning. Scattered snow showers Friday evening. Waves 4 to 7 feet
overnight subsiding to 2 to 4 feet Friday and Friday evening.

Superior South Central...Gale Warning in effect...11657 11747
12740 12730 11727 11827. Freezing spray and scattered snow showers
through early afternoon Friday. Waves 5 to 8 feet subsiding to 3
to 6 feet overnight. Waves 3 to 7 feet Friday subsiding to 2 to 4
feet Friday evening.

Superior East 11747 11737 12747 12737 11727 11817. Freezing spray
through early afternoon Friday. Waves 5 to 9 feet overnight.
Waves 3 to 7 feet Friday and Friday evening.


$$

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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