Great Lakes Forecast
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FZUS63 KMQT 100858
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
358 AM EST Wed Jan 10 2018

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 trough of 29.4 inches extending from northwest
Ontario to the central Plains this morning will cross the Upper
Great Lakes Thursday at 29.6 inches and reach the East Coast
Friday. High pressure of 30.8 inches over the Canadian Rockies
Friday will reach the Mid Mississippi Valley Sunday at 30.6
inches, as a 30.4 inch ridge crosses the Upper Great Lakes.

LSZ162-101700-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
358 AM EST Wed Jan 10 2018 /258 AM CST Wed Jan 10 2018/

...GALE WATCH IN EFFECT FROM THURSDAY MORNING THROUGH LATE
THURSDAY NIGHT...

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves 1 to
3 feet.
.TODAY...South winds 10 to 20 knots veering southwest. A slight
chance of drizzle in the morning. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest by
midnight, then becoming north 10 to 20 knots late. Areas of fog.
A chance of drizzle in the evening. Snow, possibly mixed with
rain and freezing rain likely after midnight. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...North gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. A chance of freezing rain in the morning. Snow.
Waves building to 4 to 8 feet occasionally to 10 feet.
.THURSDAY NIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots after midnight. Snow. Waves subsiding to 2 to 4 feet.
.FRIDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. A chance of snow showers. Waves subsiding to
calm to 2 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. Waves building to
1 to 3 feet.
.SATURDAY...North winds 5 to 15 knots backing northwest. Waves
subsiding to calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots veering north. A chance
of snow showers. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-101700-
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-
358 AM EST Wed Jan 10 2018

...GALE WATCH IN EFFECT FROM THURSDAY MORNING THROUGH LATE
THURSDAY NIGHT...

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves 2 to
4 feet.
.TODAY...South winds 15 to 25 knots veering southwest by late
morning, then diminishing to 10 to 20 knots by mid afternoon. A
slight chance of drizzle in the morning. Waves building to 3 to
5 feet occasionally to 7 feet, then subsiding to 1 to 3 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming north 15 to
25 knots late. Areas of fog. A chance of drizzle in the evening.
A chance of rain, possibly mixed with freezing rain and snow
after midnight. Waves subsiding to calm to 2 feet, then building
to 2 to 4 feet.
.THURSDAY...North gales to 40 knots. Freezing spray. A chance of
freezing rain in the morning. Snow. Waves building to 7 to
10 feet occasionally to 13 feet.
.THURSDAY NIGHT...North gales to 35 knots diminishing to 15 to
25 knots after midnight. Heavy freezing spray in the evening.
Snow. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...North winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. A chance of snow showers. Waves subsiding to
calm to 2 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. A chance of snow
showers. Waves building to 1 to 3 feet.
.SATURDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. A chance of snow showers. Waves subsiding to calm to
2 feet.
.SUNDAY...Southwest winds 5 to 15 knots backing south. A chance
of snow showers. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-101700-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
358 AM EST Wed Jan 10 2018

...GALE WATCH IN EFFECT FROM THURSDAY MORNING THROUGH LATE
THURSDAY NIGHT...

.EARLY THIS MORNING...South winds 20 to 30 knots. Waves 6 to
9 feet occasionally to 11 feet.
.TODAY...South winds 20 to 30 knots becoming southwest 10 to
20 knots by mid afternoon. A slight chance of snow in the
morning. A slight chance of drizzle. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming north 15 to
25 knots late. Areas of fog. A chance of drizzle. Freezing rain,
possibly mixed with rain and snow after midnight. Waves subsiding
to calm to 2 feet, then building to 2 to 4 feet.
.THURSDAY...North gales to 40 knots. Heavy freezing spray.
Freezing rain in the morning. Snow. Waves building to 9 to
12 feet occasionally to 15 feet.
.THURSDAY NIGHT...North gales to 40 knots diminishing to 20 to
30 knots after midnight. Heavy freezing spray. Snow. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots in the afternoon. Waves subsiding to 2 to 4 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. A chance of snow
showers. Waves 2 to 4 feet.
.SATURDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of snow showers. Waves subsiding to calm to
2 feet.
.SUNDAY...Northwest winds 5 to 15 knots becoming east 10 to
20 knots. A chance of snow showers. Waves building to 1 to
3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-101700-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
358 AM EST Wed Jan 10 2018

...GALE WARNING IN EFFECT UNTIL 9 AM EST THIS MORNING...
...GALE WATCH IN EFFECT FROM THURSDAY MORNING THROUGH LATE
THURSDAY NIGHT...

.EARLY THIS MORNING...South winds 20 to 30 knots. Waves 4 to
7 feet occasionally to 9 feet.
.TODAY...South winds 20 to 30 knots diminishing to 10 to 20 knots
by mid afternoon. A slight chance of drizzle in the morning.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest late.
Areas of fog. A slight chance of drizzle in the evening. Drizzle
likely and a chance of snow after midnight. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots increasing to gales to
35 knots. Areas of fog in the morning. Freezing spray in the
afternoon. Rain in the morning. Snow, possibly mixed with
freezing rain. Waves building to 9 to 12 feet occasionally to
15 feet.
.THURSDAY NIGHT...North gales to 35 knots diminishing to 20 to
30 knots after midnight. Heavy freezing spray. Snow. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
.FRIDAY...North winds 15 to 25 knots backing northwest in the
afternoon. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots. 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. A chance of snow showers. Waves subsiding to calm to
2 feet.
.SUNDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots. A chance of snow showers. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-101700-
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-
358 AM EST Wed Jan 10 2018

...GALE WARNING IN EFFECT UNTIL 1 PM EST THIS AFTERNOON...

.EARLY THIS MORNING...South gales to 35 knots. Waves 6 to 9 feet
occasionally to 11 feet building to 7 to 10 feet occasionally to
13 feet.
.TODAY...South gales to 35 knots diminishing to 15 to 25 knots by
mid afternoon. A slight chance of drizzle in the morning. Waves
building to 8 to 11 feet occasionally to 14 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest late.
Areas of fog. A chance of drizzle. Waves subsiding to 2 to
4 feet.
.THURSDAY...Southwest gales to 35 knots becoming north gales to
40 knots. Areas of fog in the morning. Freezing spray in the
afternoon. Snow, possibly mixed with rain and freezing rain.
Waves building to 9 to 12 feet occasionally to 15 feet.
.THURSDAY NIGHT...North gales to 40 knots. Heavy freezing spray.
Snow. Waves building to 10 to 14 feet occasionally to 18 feet,
then subsiding to 7 to 10 feet occasionally to 13 feet.
.FRIDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Heavy freezing spray in the morning. A
chance of snow showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots increasing to 20 to
30 knots after midnight. A chance of snow showers. Freezing spray
after midnight. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.SATURDAY...North 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.
.SUNDAY...Northwest winds 10 to 20 knots backing south. Snow
showers likely, then a chance of snow showers. Waves subsiding to
calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-101700-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
358 AM EST Wed Jan 10 2018

...GALE WARNING IN EFFECT UNTIL 1 PM EST THIS AFTERNOON...

.EARLY THIS MORNING...South gales to 35 knots. Waves 3 to 6 feet
occasionally to 8 feet.
.TODAY...South gales to 35 knots diminishing to 20 to 30 knots by
mid afternoon. A slight chance of drizzle. Waves building to 5 to
8 feet occasionally to 10 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots late. Patchy fog. A chance of drizzle in the evening.
Drizzle and rain likely after midnight. Waves subsiding to calm
to 2 feet.
.THURSDAY...South winds 10 to 20 knots becoming north 20 to
30 knots by mid afternoon. Areas of fog. Rain. Snow, possibly
mixed with freezing rain in the afternoon. Waves building to 3 to
6 feet occasionally to 8 feet.
.THURSDAY NIGHT...North winds 20 to 30 knots increasing to gales
to 35 knots after midnight. Heavy freezing spray. A chance of
freezing rain in the evening. Snow likely. Waves building to 5 to
9 feet occasionally to 11 feet.
.FRIDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Heavy freezing spray in the morning.
Waves subsiding to 2 to 4 feet.
.FRIDAY NIGHT...North winds 15 to 25 knots. Waves building to
3 to 5 feet occasionally to 7 feet.
.SATURDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves subsiding to calm to
2 feet.
.SUNDAY...South winds 10 to 20 knots. Snow showers likely, then a
chance of snow showers. Waves building to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-101700-
MAFOR 1010/
Superior West 11420 11430 11530 11520 11510 12500 11716. Patchy
fog late this evening. Chance of rain and drizzle after midnight
tonight. Waves 1 to 3 feet today. Waves 2 feet or less tonight.

Superior North Central 13440 11530 11520 11510 11503 11713.
Chance of drizzle late this evening. Chance of rain and drizzle
overnight. Waves 5 to 9 feet subsiding to 3 to 6 feet today.
Waves subsiding to 1 to 3 feet tonight.

Superior South Central...Gale Warning in effect...13450 11430
11420 11410 12413. Patchy fog late this evening. Chance of
drizzle overnight. Waves 5 to 8 feet subsiding to 2 to 4 feet
today. Waves 1 to 3 feet tonight.

Superior East...Gale Warning in effect...11440 12450 11440 11430
12420 11520. Patchy fog overnight. Chance of drizzle overnight.
Waves 5 to 8 feet building to 6 to 10 feet, then subsiding to 4
to 7 feet today. Waves subsiding to 1 to 3 feet tonight.

$$

JLB

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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