Great Lakes Forecast
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000
FZUS63 KMQT 171447
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
947 AM EST Wed Jan 17 2018



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...Through tonight, Lake Superior will be between a 29.6
inch low pressure over far southern Hudson Bay and a 30.6 inch
high pressure over the Lower Mississippi Valley. A 29.8 inch
trough will then drift from Lake Manitoba to the Upper Great
Lakes Thursday. A 29.3 inch low pressure will develop across
southern Manitoba Friday and track eastward to central Quebec by
midday Saturday. On Sunday morning a 29.6 inch low over the
southern plains is expected to deepen to 29.5 inches over northern
Missouri by Sunday evening.

LSZ162-172300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
947 AM EST Wed Jan 17 2018 /847 AM CST Wed Jan 17 2018/

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 11 AM EST /10 AM
CST/ THIS MORNING...

.REST OF TODAY...Southwest gales to 40 knots. Heavy freezing
spray through noon, then freezing spray through mid afternoon. Patchy
blowing snow. Waves 9 to 12 feet occasionally to 15 feet
subsiding to 7 to 10 feet occasionally to 13 feet.
.TONIGHT...West gales to 35 knots diminishing to 15 to 25 knots
by midnight, then becoming southwest 10 to 20 knots late. A
slight chance of snow showers after midnight. Waves subsiding to
2 to 4 feet.
.THURSDAY...Southwest winds 10 to 20 knots veering west by late
morning, then diminishing to 5 to 15 knots by mid afternoon.
Scattered snow showers. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots. Waves building
to 1 to 3 feet.
.FRIDAY...Southwest winds 10 to 20 knots. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 2 to 4 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.SUNDAY...Northeast winds 15 to 25 knots increasing to gales to
35 knots. A chance of snow showers. Freezing spray and patchy
blowing snow. Waves building to 7 to 10 feet occasionally to
13 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-172300-
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-
947 AM EST Wed Jan 17 2018

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 11 AM EST THIS
MORNING...

.REST OF TODAY...West gales to 40 knots backing southwest by late
morning, then veering west by mid afternoon. Heavy freezing spray
through noon, then freezing spray through early afternoon. Patchy
blowing snow. Waves 11 to 15 feet occasionally to 19 feet
subsiding to 9 to 12 feet occasionally to 15 feet.
.TONIGHT...West gales to 35 knots diminishing to 15 to 25 knots.
A slight chance of snow showers after midnight. Waves subsiding
to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Scattered snow showers. Waves
subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming west
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.SUNDAY...Northeast winds 15 to 25 knots increasing to gales to
35 knots. A chance of snow showers. Freezing spray. Waves
building to 7 to 10 feet occasionally to 13 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-172300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
947 AM EST Wed Jan 17 2018

...GALE WARNING IN EFFECT THROUGH LATE TONIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 11 AM EST THIS
MORNING...

.REST OF TODAY...West gales to 45 knots. Heavy freezing spray
through late morning, then freezing spray through early
afternoon. Waves 12 to 17 feet occasionally to 21 feet subsiding
to 9 to 12 feet occasionally to 15 feet.
.TONIGHT...West gales to 35 knots becoming northwest 15 to
25 knots by midnight, then diminishing to 10 to 20 knots late.
Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Northwest winds 5 to 15 knots veering north. Isolated
snow showers. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots. A chance of drizzle.
Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...West winds 15 to 25 knots. Waves 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...West winds 10 to 20 knots becoming northeast 5 to
15 knots. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SUNDAY...Northeast winds 10 to 20 knots increasing to 20 to
30 knots. A chance of snow showers. Freezing spray. Waves
building to 6 to 9 feet occasionally to 11 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-172300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
947 AM EST Wed Jan 17 2018

...GALE WARNING IN EFFECT THROUGH THIS EVENING...

.REST OF TODAY...West gales to 40 knots. Freezing spray through
noon. Waves 5 to 8 feet occasionally to 10 feet subsiding to 3 to
5 feet occasionally to 7 feet.
.TONIGHT...West winds 20 to 30 knots diminishing to 10 to
20 knots late. A slight chance of snow showers. Waves subsiding
to 1 to 3 feet.
.THURSDAY...West winds 10 to 20 knots. Scattered snow showers.
Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots veering southwest in the
afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots veering west after
midnight. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.SATURDAY...West winds 10 to 20 knots veering north. Waves calm
to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots becoming east 15 to
25 knots. A chance of snow showers, then snow showers. Waves
building to 5 to 8 feet occasionally to 10 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-172300-
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-
947 AM EST Wed Jan 17 2018

...GALE WARNING IN EFFECT THROUGH THIS EVENING...

.REST OF TODAY...West gales to 45 knots. Freezing spray through
noon. Waves 12 to 17 feet occasionally to 21 feet subsiding to 8
to 11 feet occasionally to 14 feet.
.TONIGHT...West winds 20 to 30 knots with a few gale force gusts
to 35 knots early. Veering northwest by midnight, then
diminishing to 15 to 25 knots late. A slight chance of snow
showers after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY...West winds 10 to 20 knots. Scattered snow showers.
Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. A slight chance of snow showers in
the evening. Waves building to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots. A chance of drizzle in the
afternoon. Waves building to 3 to 5 feet occasionally to 7 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots veering west after
midnight. Waves 3 to 5 feet occasionally to 7 feet.
.SATURDAY...West winds 10 to 20 knots veering north. Waves
subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 20 to 30 knots.
A chance of snow showers, then snow showers. Freezing spray.
Waves building to 5 to 8 feet occasionally to 10 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-172300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
947 AM EST Wed Jan 17 2018

...GALE WARNING IN EFFECT UNTIL 7 PM EST THIS EVENING...

.REST OF TODAY...Southwest gales to 40 knots becoming west 20 to
30 knots by mid afternoon. Freezing spray and patchy blowing snow
through noon. Waves 9 to 12 feet occasionally to 15 feet building
to 10 to 14 feet occasionally to 18 feet, then subsiding to 7 to
10 feet occasionally to 13 feet.
.TONIGHT...West winds 15 to 25 knots. A slight chance of snow
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 10 to 20 knots. Scattered snow showers.
Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots. A slight chance
of snow showers in the evening. Waves building to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon. A chance of drizzle, possibly mixed with rain
and snow showers in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.FRIDAY NIGHT...Southwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. Waves subsiding to 2 to 4 feet.
.SATURDAY...West winds 10 to 20 knots veering northwest. A chance
of snow showers. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 15 to 25 knots.
A chance of snow showers, then snow showers. Waves building to
3 to 6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-172300-
MAFOR 1716/
Superior West...Gale Warning and Heavy Freezing Spray Warning in
effect...11550 11551 12650 11640 11630 12520. Heavy freezing
spray late this morning, then freezing spray through early afternoon.
Scattered snow showers Thursday morning. Waves 9 to 12 feet this
afternoon. Waves 7 to 10 feet subsiding to 2 to 4 feet tonight
through Thursday morning.

Superior North Central...Gale Warning and Heavy Freezing Spray
Warning in effect...11661 11660 11650 11740 11730 12720 11710.
Heavy freezing spray late this morning, then freezing spray
through early afternoon. Waves 10 to 16 feet this afternoon.
Waves 9 to 12 feet subsiding to 3 to 6 feet tonight. Waves 1 to 3
feet Thursday morning.

Superior South Central...Gale Warning in effect...12650 13640
11630 11620 11610. Freezing spray late this morning. Scattered
snow showers late Thursday morning. Waves 6 to 9 feet subsiding
to 3 to 7 feet this afternoon and tonight. Waves 1 to 4 feet
Thursday morning.

Superior East...Gale Warning in effect...11651 11650 12640 11730
12720 11620. Freezing spray late this morning. Waves 10 to 14
feet this afternoon. Waves 6 to 10 feet subsiding to 5 to 8 feet
tonight. Waves 3 to 5 feet Thursday morning.

$$

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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