Great Lakes Forecast
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FZUS63 KMQT 051449
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
949 AM EST Tue Dec 5 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...Low pressure of 28.8 inches over northern Lake
Superior will deepen to 28.7 inches as it tracks over northern
Ontario today. The low will weaken to 29.2 inches over James Bay
on Wednesday and then track into northern Quebec on Thursday while
high pressure of 30.8 inches remains over the Colorado Rockies.
On Friday, a low pressure trough of 29.7 inches will drop
southeast across Lake Superior. In its wake, a high pressure ridge
of 30.1 inches will quickly pass across the western Great Lakes
ahead of the next low pressure trough of 29.6 inches dropping
southeast into northern Ontario late Saturday.

LSZ162-052300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
949 AM EST Tue Dec 5 2017 /849 AM CST Tue Dec 5 2017/

...STORM WARNING IN EFFECT UNTIL 7 PM EST /6 PM CST/ THIS
EVENING...

.REST OF TODAY...West gales to 45 knots with a few storm force
gusts to 50 knots. Freezing spray. Scattered snow showers. Waves
10 to 14 feet occasionally to 18 feet.
.TONIGHT...West gales to 45 knots. Freezing spray. Scattered snow
showers. Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots by mid afternoon. Freezing spray. A chance of snow
showers. Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. Freezing spray in the evening. A
chance of snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...Northwest winds 10 to 20 knots backing west in the
afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots. A chance of
snow showers. Waves 1 to 3 feet.
.FRIDAY...North winds 20 to 30 knots. A chance of snow showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 1 to 3 feet.
.SATURDAY...West winds 10 to 20 knots. Waves subsiding to calm to
2 feet, then building to 2 to 4 feet.

$$

LSZ263-052300-
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-
949 AM EST Tue Dec 5 2017

...STORM WARNING IN EFFECT THROUGH THIS EVENING...

.REST OF TODAY...West storm force winds to 55 knots. Freezing
spray. Numerous snow showers. Waves 15 to 20 feet occasionally to
25 feet.
.TONIGHT...West storm force winds to 55 knots diminishing to
gales to 45 knots. Freezing spray. Scattered snow showers. Waves
subsiding to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY...West gales to 45 knots becoming northwest gales to
35 knots early, and then diminishing to 20 to 30 knots by mid
afternoon. Freezing spray. Snow showers. Waves subsiding to 5 to
8 feet occasionally to 10 feet.
.WEDNESDAY NIGHT...Northwest winds 20 to 30 knots. Freezing
spray. A chance of snow showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...Northwest winds 10 to 20 knots backing west in the
afternoon. A chance of snow showers. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots. A chance of
snow showers. Waves 2 to 4 feet.
.FRIDAY...North winds 20 to 30 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...Northwest winds 10 to 20 knots backing west. A chance
of snow showers. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.

$$

LSZ264-052300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
949 AM EST Tue Dec 5 2017

...STORM WARNING IN EFFECT THROUGH THIS EVENING...

.REST OF TODAY...West storm force winds to 55 knots. Freezing
spray. Snow showers. Waves 15 to 20 feet occasionally to 25 feet.
.TONIGHT...West storm force winds to 55 knots diminishing to
gales to 45 knots by midnight. Freezing spray. Snow showers.
Waves subsiding to 10 to 14 feet occasionally to 18 feet.
.WEDNESDAY...Northwest gales to 40 knots. Freezing spray. Snow
showers likely in the morning. A chance of snow showers in the
afternoon. Waves subsiding to 7 to 10 feet occasionally to
13 feet.
.WEDNESDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. Freezing spray. A chance of snow
showers. Waves building to 8 to 11 feet occasionally to 14 feet,
then subsiding to 5 to 8 feet occasionally to 10 feet.
.THURSDAY...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.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots. A chance of
snow showers. Waves 2 to 4 feet.
.FRIDAY...North winds 20 to 30 knots. A chance of snow showers.
Freezing spray. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming west 15 to
25 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet, then building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ265-052300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
949 AM EST Tue Dec 5 2017

...STORM WARNING IN EFFECT THROUGH THIS EVENING...

.REST OF TODAY...West storm force winds to 55 knots. Snow
showers. Freezing spray in the afternoon. Waves 10 to 14 feet
occasionally to 18 feet.
.TONIGHT...West storm force winds to 55 knots diminishing to
gales to 45 knots by midnight. Freezing spray. Numerous snow
showers. Waves subsiding to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY...West gales to 40 knots veering northwest. Freezing
spray in the morning. Snow showers. Waves subsiding to 6 to
9 feet occasionally to 11 feet, then building to 7 to 10 feet
occasionally to 13 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots diminishing to
20 to 30 knots after midnight. Snow showers likely. Freezing
spray after midnight. Waves building to 8 to 11 feet occasionally
to 14 feet, then subsiding to 5 to 8 feet occasionally to
10 feet.
.THURSDAY...Northwest winds 20 to 30 knots becoming west 15 to
25 knots in the afternoon. Freezing spray in the morning. A
chance of snow showers. Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots. A chance of snow
showers in the evening, then snow showers likely after midnight.
Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...Northwest winds 20 to 30 knots veering north. Snow
showers. Freezing spray. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SATURDAY...Northwest winds 15 to 25 knots becoming west 20 to
30 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.

$$

LSZ266-052300-
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-
949 AM EST Tue Dec 5 2017

...STORM WARNING IN EFFECT THROUGH THIS EVENING...

.REST OF TODAY...West storm force winds to 55 knots. Snow
showers. Freezing spray in the afternoon. Waves 12 to 17 feet
occasionally to 21 feet building to 15 to 20 feet occasionally to
25 feet.
.TONIGHT...West storm force winds to 55 knots diminishing to
gales to 45 knots by midnight. Freezing spray. Snow showers.
Waves subsiding to 12 to 17 feet occasionally to 21 feet.
.WEDNESDAY...West gales to 40 knots veering northwest. Freezing
spray in the morning. Snow showers. Waves subsiding to 9 to
12 feet occasionally to 15 feet.
.WEDNESDAY NIGHT...Northwest gales to 40 knots. Snow showers.
Freezing spray after midnight. Waves subsiding to 7 to 10 feet
occasionally to 13 feet.
.THURSDAY...Northwest winds 20 to 30 knots diminishing to 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 subsiding to 3 to 5 feet occasionally to
7 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots. Snow showers likely.
Waves 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Northwest winds 20 to 30 knots veering north. Freezing
spray. Snow showers. Waves building to 4 to 8 feet occasionally
to 10 feet.
.SATURDAY...Northwest winds 15 to 25 knots becoming west 20 to
30 knots. A chance of snow showers. Waves subsiding to 2 to
4 feet, then building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ267-052300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
949 AM EST Tue Dec 5 2017

...STORM WARNING IN EFFECT THROUGH THIS EVENING...

.REST OF TODAY...Southwest storm force winds to 55 knots becoming
west late. Numerous rain showers late in the morning. Snow
showers. Waves 11 to 15 feet occasionally to 19 feet building to
15 to 20 feet occasionally to 25 feet.
.TONIGHT...West storm force winds to 50 knots, diminishing to
gales to 45 knots late. Snow showers. Waves subsiding to 12 to 17
feet occasionally to 21 feet.
.WEDNESDAY...West gales to 40 knots veering northwest by mid
afternoon. Snow showers. Waves subsiding to 9 to 12 feet
occasionally to 15 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots becoming north
20 to 30 knots after midnight. Snow showers. Waves subsiding to
6 to 9 feet occasionally to 11 feet.
.THURSDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots in the afternoon. Freezing spray in the morning. Snow
showers likely. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots. Snow showers likely.
Waves 3 to 5 feet occasionally to 7 feet.
.FRIDAY...West winds 15 to 25 knots veering north. Snow showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...North winds 15 to 25 knots backing west. A chance of
snow showers. Freezing spray. Waves subsiding to 1 to 3 feet,
then building to 3 to 6 feet occasionally to 8 feet.

$$
LSZ261-052300-
MAFOR 0516/
Superior West...Storm Warning in effect...13670 12660 11650
12750. Freezing spray. Scattered snow showers. Waves 10 to 14
feet this afternoon subsiding to 5 to 9 feet Wednesday morning.

Superior North Central...Storm Warning in effect...14677 11677
11667 12757. Freezing spray. Waves 14 to 19 feet this afternoon
subsiding to 10 to 14 feet tonight, and then 8 to 12 feet
Wednesday morning.

Superior South Central...Storm Warning in effect...11671 14677
12667 11657. Freezing spray this afternoon. Scattered snow
showers. Waves 10 to 15 feet this afternoon and tonight, subsiding
to 8 to 12 feet Wednesday morning.

Superior East...Storm Warning in effect...14677 11677 11667
12657. Waves 15 to 20 feet.

$$

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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