Great Lakes Forecast
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000
FZUS63 KMQT 190917
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
417 AM EST Mon Feb 19 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 29.8 inch trough over eastern Lake Superior will
shift east this morning while a 30.5 inch high pressure will move
across northern Ontario. Secondary troughing of 29.8 inches will
push northeastward into the Western Great Lakes into Tuesday
morning and remain in the area through Wednesday morning. A high
pressure system of 30.6 inches will reach the Great Lakes
Wednesday afternoon and slowly shift into southern Quebec through
the day Thursday.

LSZ162-191730-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
417 AM EST Mon Feb 19 2018 /317 AM CST Mon Feb 19 2018/

.EARLY THIS MORNING...Northeast winds 15 to 25 knots. Isolated
snow showers.
.TODAY...Northeast winds 20 to 30 knots. Areas of blowing snow.
Heavy freezing spray in the afternoon. Scattered snow showers in
the morning. Numerous snow showers in the afternoon.
.TONIGHT...Northeast winds 20 to 30 knots. Heavy freezing spray
and areas of blowing snow. Numerous snow showers.
.TUESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then becoming northwest 5 to 15 knots
by mid afternoon. Heavy freezing spray and patchy blowing snow in
the morning. Snow showers, possibly mixed with freezing rain in
the morning, then a chance of snow showers in the afternoon.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots. A slight chance
of snow showers.
.WEDNESDAY...West winds 5 to 15 knots.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight.
.THURSDAY...Southwest winds 5 to 15 knots backing south. A chance
of snow showers.
.FRIDAY...Southwest winds 5 to 15 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-191730-
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-
417 AM EST Mon Feb 19 2018

.EARLY THIS MORNING...North winds 20 to 30 knots. Patchy blowing
snow. Scattered snow showers.
.TODAY...Northeast winds 20 to 30 knots. Areas of blowing snow.
Scattered snow showers in the morning. Numerous snow showers in
the afternoon.
.TONIGHT...Northeast winds 20 to 30 knots. Areas of blowing snow.
Numerous snow showers. A slight chance of freezing rain and
patchy freezing drizzle after midnight.
.TUESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then becoming north 5 to 15 knots by
mid afternoon. Areas of blowing snow in the morning. Snow
showers, possibly mixed with freezing rain.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots. A chance of snow
showers.
.WEDNESDAY...West winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots.
.THURSDAY...Southwest winds 5 to 15 knots backing south. A chance
of snow showers.
.FRIDAY...Southwest winds 5 to 15 knots. A chance of snow
showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-191730-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
417 AM EST Mon Feb 19 2018

.EARLY THIS MORNING...North winds 20 to 30 knots. Patchy blowing
snow. Isolated snow showers.
.TODAY...North winds 20 to 30 knots veering northeast. Areas of
blowing snow. Scattered snow showers in the morning. Numerous
snow showers in the afternoon.
.TONIGHT...Northeast winds 20 to 30 knots. Areas of blowing snow.
Numerous snow showers. A slight chance of freezing rain and
patchy freezing drizzle after midnight.
.TUESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then becoming north 5 to 15 knots by
mid afternoon. Areas of blowing snow. Snow showers, possibly
mixed with freezing rain.
.TUESDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. A chance of snow showers.
.WEDNESDAY...West winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A chance of snow showers in the
morning.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots.
.THURSDAY...Southwest winds 5 to 15 knots backing south. Snow
showers likely.
.FRIDAY...Southwest winds 5 to 15 knots. A chance of snow
showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-191730-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
417 AM EST Mon Feb 19 2018

.EARLY THIS MORNING...North winds 15 to 25 knots. Patchy blowing
snow. Isolated snow showers and patchy freezing drizzle.
.TODAY...North winds 20 to 30 knots. Areas of blowing snow.
Scattered snow showers in the morning. Numerous snow showers in
the afternoon.
.TONIGHT...Northeast winds 20 to 30 knots. Areas of blowing snow.
A slight chance of freezing rain in the evening. Numerous snow
showers. Freezing rain likely and widespread freezing drizzle
after midnight.
.TUESDAY...Northeast winds 10 to 20 knots backing north. Freezing
rain likely in the morning. A chance of snow showers. A chance of
freezing rain in the afternoon.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots. A slight chance
of snow showers.
.WEDNESDAY...West winds 10 to 20 knots.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight.
.THURSDAY...South winds 5 to 15 knots. Snow showers likely.
.FRIDAY...West winds 5 to 15 knots. A chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-191730-
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-
417 AM EST Mon Feb 19 2018

.EARLY THIS MORNING...North winds 15 to 25 knots. Patchy blowing
snow. Isolated snow showers and patchy freezing drizzle. Waves
1 to 3 feet.
.TODAY...North winds 20 to 30 knots veering northeast. Areas of
blowing snow. Freezing spray in the afternoon. Scattered snow
showers and patchy freezing drizzle in the morning. Numerous snow
showers, possibly mixed with freezing rain in the afternoon.
Waves building to 7 to 10 feet occasionally to 13 feet.
.TONIGHT...Northeast winds 20 to 30 knots. Heavy freezing spray
and areas of blowing snow. Numerous snow showers, possibly mixed
with freezing rain. Widespread freezing drizzle after midnight.
Waves building to 7 to 11 feet occasionally to 14 feet.
.TUESDAY...East winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then backing north by mid afternoon.
Freezing spray in the morning. Freezing rain likely, possibly
mixed with snow showers. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots. A chance of
freezing rain in the evening. A chance of snow showers. Waves
building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots backing west in the
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing south. Snow
showers likely. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots backing southwest. A chance of
snow showers. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-191730-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
417 AM EST Mon Feb 19 2018

.EARLY THIS MORNING...South winds 10 to 20 knots. Scattered rain
showers, freezing rain, freezing drizzle and snow showers. Waves
1 to 3 feet subsiding to calm to 2 feet.
.TODAY...North winds 15 to 25 knots becoming northeast 20 to
30 knots. Isolated snow showers and patchy freezing drizzle in
the morning, then snow showers, possibly mixed with freezing rain
in the afternoon. Freezing spray and areas of blowing snow in the
afternoon. Waves building to 5 to 9 feet occasionally to 11 feet.
.TONIGHT...Northeast winds 20 to 30 knots becoming east 15 to
25 knots by midnight. Heavy freezing spray. Numerous snow showers
in the evening. Freezing rain likely. Areas of freezing drizzle
and isolated snow showers after midnight. Waves subsiding to 5 to
8 feet occasionally to 10 feet.
.TUESDAY...East winds 15 to 25 knots diminishing to 10 to
20 knots by late morning, then backing north by mid afternoon. A
slight chance of snow showers in the morning. Freezing rain
likely. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. A chance of freezing rain in the
evening. A slight chance of snow showers. Heavy freezing spray
after midnight. Waves building to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots. Waves subsiding to
1 to 3 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. Snow showers likely. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots becoming west 5 to 15 knots.
A chance of snow showers. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-191730-
MAFOR 1910/
Superior West 11140 11142 14147 12147. Heavy freezing spray from
late morning on. Scattered snow showers late this morning. Heavy
freezing spray tonight. Waves omitted for mostly ice covered
areas.

Superior North Central 11840 12140 14147 11147. Scattered snow
showers today. Patchy light freezing drizzle overnight. Waves
omitted for mostly ice covered areas.

Superior South Central 12830 12837 13147 11130. Patchy light
freezing drizzle early this morning. Scattered snow showers late
this morning. Chance of light freezing rain late this evening.
Scattered snow showers late tonight. Waves omitted for mostly ice
covered areas.

Superior East 11610 11830 11140 11147 12147 12147. Freezing spray
this afternoon. Scattered snow showers with patchy light freezing
drizzle early this afternoon. Heavy freezing spray. Chance of
light freezing rain late this evening. Chance of light freezing
rain with areas of light freezing drizzle after midnight tonight.
Waves 1 to 3 feet building to 6 to 9 feet today. Waves 7 to 10
feet tonight.

$$

Titus

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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