Great Lakes Forecast
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FZUS63 KMQT 111454
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
954 AM EST Sun Feb 11 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...A weak low pressure system of 29.8 inches over
northwest Ontario will progress eastward today, and a high
pressure system of 30.9 inches will gradually build into the Great
Lakes on Monday. The high will continue drifting eastward to New
England on Tuesday before a quickly moving trough of 29.3 inches
sweeps through the area on Wednesday evening. Several high and low
pressure systems may then impact the area late next week.

LSZ162-112300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
954 AM EST Sun Feb 11 2018 /854 AM CST Sun Feb 11 2018/

.REST OF TODAY...Southwest winds 5 to 15 knots increasing to
20 to 30 knots by late morning, then veering west by mid
afternoon. Patchy blowing snow in the afternoon.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
by midnight.
.MONDAY...West winds 5 to 15 knots.
.MONDAY NIGHT...Southwest winds 5 to 15 knots.
.TUESDAY...Southwest winds 10 to 20 knots increasing to 20 to
30 knots in the afternoon. Patchy blowing snow in the afternoon.
.TUESDAY NIGHT...Southwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Patchy blowing snow.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Snow showers likely.
.THURSDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. A chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-112300-
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-
954 AM EST Sun Feb 11 2018

.REST OF TODAY...Southwest winds 10 to 20 knots increasing to
20 to 30 knots by late morning, then veering west by mid
afternoon. Patchy blowing snow in the afternoon.
.TONIGHT...West winds 15 to 25 knots diminishing to 5 to 15 knots
by midnight. A slight chance of snow showers in the evening.
.MONDAY...West winds 5 to 15 knots.
.MONDAY NIGHT...Southwest winds 5 to 15 knots.
.TUESDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. A chance of snow showers. Patchy
blowing snow in the afternoon.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots. Patchy blowing
snow.
.WEDNESDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots. Patchy blowing snow. Snow showers likely.
.THURSDAY...North winds 15 to 25 knots becoming northwest 5 to
15 knots. Patchy blowing snow. A chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-112300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
954 AM EST Sun Feb 11 2018

.REST OF TODAY...West winds 5 to 15 knots becoming southwest
20 to 30 knots by late morning, then veering west by mid
afternoon. Patchy blowing snow in the afternoon. A slight chance
of snow in the afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots by midnight. Patchy blowing snow in the evening. A
slight chance of snow showers. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by late morning, then increasing to 10 to 20 knots by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southwest winds 10 to 20 knots. Waves calm to
2 feet.
.TUESDAY...Southwest winds 15 to 25 knots increasing to 20 to
30 knots in the afternoon. Patchy blowing snow. A chance of snow
showers. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots increasing to
gales to 35 knots after midnight. Patchy blowing snow. Waves calm
to 2 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots. Patchy blowing snow. Snow showers likely. Waves calm to
2 feet.
.THURSDAY...North winds 20 to 30 knots becoming northwest 10 to
20 knots. Patchy blowing snow. A chance of snow showers. Waves
calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-112300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
954 AM EST Sun Feb 11 2018

.REST OF TODAY...Southwest winds less than 10 knots increasing to
5 to 15 knots by late morning, then becoming west 10 to 20 knots
by mid afternoon.
.TONIGHT...West winds 15 to 25 knots. Patchy blowing snow in the
evening. A slight chance of snow showers.
.MONDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots.
.MONDAY NIGHT...West winds 5 to 15 knots backing southwest after
midnight.
.TUESDAY...South winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight.
.WEDNESDAY...Southwest winds 15 to 25 knots veering west. A
chance of snow showers.
.THURSDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots. Patchy blowing snow. A chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-112300-
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-
954 AM EST Sun Feb 11 2018

...GALE WARNING IN EFFECT FROM 4 PM EST THIS AFTERNOON THROUGH
LATE TONIGHT...

.REST OF TODAY...Southwest winds 10 to 20 knots increasing to
15 to 25 knots by late morning, then becoming west 20 to 30 knots
by mid afternoon. A slight chance of snow. Waves 2 to 4 feet
building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...West gales to 35 knots veering northwest by midnight,
then diminishing to 20 to 30 knots late. Heavy freezing spray. A
slight chance of snow showers. Waves building to 7 to 10 feet
occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.MONDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots. A chance of snow showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.MONDAY NIGHT...West winds 10 to 20 knots backing southwest after
midnight. Waves subsiding to 2 to 4 feet.
.TUESDAY...Southwest winds 10 to 20 knots becoming south 20 to
30 knots in the afternoon. Snow showers likely in the morning,
then a chance of snow showers in the afternoon. Freezing spray in
the afternoon. Waves building to 5 to 8 feet occasionally to
10 feet.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots. Waves subsiding
to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...South winds 15 to 25 knots veering west. A chance of
snow showers. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.
.THURSDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots. Freezing spray. Snow showers likely, then a chance of
snow showers. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-112300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
954 AM EST Sun Feb 11 2018

...GALE WARNING IN EFFECT FROM 4 PM EST THIS AFTERNOON THROUGH
LATE TONIGHT...

.REST OF TODAY...South winds 10 to 20 knots veering southwest by
late morning, then becoming west 20 to 30 knots by mid afternoon.
A chance of snow. Waves 1 to 3 feet building to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...West gales to 35 knots becoming northwest 20 to
30 knots late. Heavy freezing spray. A chance of snow showers.
Waves building to 7 to 10 feet occasionally to 13 feet, then
subsiding to 5 to 8 feet occasionally to 10 feet.
.MONDAY...Northwest winds 15 to 25 knots backing west. Heavy
freezing spray in the morning. A chance of snow showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...West winds 10 to 20 knots backing southwest after
midnight. A slight chance of snow showers in the evening. Waves
subsiding to 2 to 4 feet.
.TUESDAY...South winds 10 to 20 knots increasing to 20 to
30 knots in the afternoon. A chance of snow showers. Freezing
spray in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY NIGHT...Southwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. A chance of snow showers in the
evening. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...South winds 15 to 25 knots veering southwest. A
chance of snow showers. Waves subsiding to 1 to 3 feet.
.THURSDAY...North winds 15 to 25 knots backing northwest.
Freezing spray. A chance of snow showers. Waves building to 3 to
6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-112300-
MAFOR 1116/
Superior West 11540 12640 12620 13610. Waves omitted for mostly
ice covered areas.

Superior North Central 11530 13640 11630 11730 12720. Waves
omitted for mostly ice covered areas.

Superior South Central...Gale Warning in effect...11510 11620
11630 11650 12640 12620. Waves omitted for mostly ice covered
areas.

Superior East...Gale Warning in effect...12530 12650 11752 12742
11732. Chance of snow late this morning through Monday morning.
Heavy freezing spray. Waves 2 to 5 feet building to 6 to 10 feet
tonight. Waves 5 to 8 feet Monday morning.

$$

JSS

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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