Great Lakes Forecast
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FZUS63 KMQT 182146 CCA
GLFLS

Open Lake Forecast for Lake Superior...CORRECTED
National Weather Service Marquette MI
446 PM EST Sun Feb 18 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 trough of 29.7 inches will move into the Upper
Great Lakes this evening and weaken to 29.9 inches late tonight,
and a 30.5 inch high pressure will then move across northern
Ontario Monday. 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.

LSZ162-190530-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
446 PM EST Sun Feb 18 2018 /346 PM CST Sun Feb 18 2018/

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. Snow.
.TONIGHT...Northeast winds 15 to 25 knots backing north by
midnight. Snow in the evening, then a slight chance of snow after
midnight.
.MONDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of snow.
.MONDAY NIGHT...Northeast winds 20 to 30 knots diminishing to
15 to 25 knots late. Snow.
.TUESDAY...Northeast winds 15 to 25 knots becoming north 5 to
15 knots in the afternoon. Snow likely in the morning, then a
chance of snow in the afternoon.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots. A chance of snow.
.WEDNESDAY...West winds 5 to 15 knots backing southwest in the
afternoon.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots.
.THURSDAY...Southwest winds 5 to 15 knots backing south.
.FRIDAY...South winds 5 to 15 knots veering west. A chance of
snow.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-190530-
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-
446 PM EST Sun Feb 18 2018

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Snow.
.TONIGHT...Northeast winds 15 to 25 knots backing north by
midnight. Snow in the evening, then a chance of snow and a slight
chance of freezing drizzle after midnight.
.MONDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. A chance of snow in the morning, then
snow likely in the afternoon.
.MONDAY NIGHT...Northeast winds 20 to 30 knots diminishing to
15 to 25 knots late. Snow likely.
.TUESDAY...Northeast winds 15 to 25 knots diminishing to 5 to
15 knots in the afternoon. Snow likely, possibly mixed with
freezing rain.
.TUESDAY NIGHT...North winds 5 to 15 knots backing northwest
after midnight. A chance of snow.
.WEDNESDAY...West winds 5 to 15 knots. A chance of snow in the
morning.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots.
.THURSDAY...Southwest winds 5 to 15 knots backing south. A chance
of snow.
.FRIDAY...South winds 5 to 15 knots veering west. A chance of
snow.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-190530-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
446 PM EST Sun Feb 18 2018

.LATE THIS AFTERNOON...East winds 15 to 25 knots. Snow.
.TONIGHT...East winds 10 to 20 knots becoming north 15 to
25 knots by midnight. Snow in the evening, then a chance of snow
after midnight.
.MONDAY...North winds 15 to 25 knots veering northeast. A chance
of snow.
.MONDAY NIGHT...Northeast winds 15 to 25 knots. A chance of snow
in the evening, then snow likely after midnight.
.TUESDAY...Northeast winds 15 to 25 knots diminishing to 5 to
15 knots in the afternoon. Snow likely, possibly mixed with
freezing rain. A slight chance of freezing drizzle in the
afternoon.
.TUESDAY NIGHT...North winds 5 to 15 knots backing northwest
after midnight. A chance of snow.
.WEDNESDAY...Northwest winds 5 to 15 knots backing west in the
afternoon. A chance of snow.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight.
.THURSDAY...Southwest winds 5 to 15 knots backing south. A chance
of snow.
.FRIDAY...South winds 5 to 15 knots veering west. A chance of
snow.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-190530-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
446 PM EST Sun Feb 18 2018

.LATE THIS AFTERNOON...Southeast winds 15 to 25 knots. Snow.
.TONIGHT...South winds 15 to 25 knots diminishing to 10 to
20 knots by midnight, then becoming north 15 to 25 knots late.
Snow likely in the evening, then a chance of snow and a slight
chance of freezing drizzle after midnight.
.MONDAY...North winds 20 to 30 knots becoming northeast 15 to
25 knots by mid afternoon. A slight chance of freezing rain in
the morning. Snow likely.
.MONDAY NIGHT...Northeast winds 20 to 30 knots diminishing to
15 to 25 knots by midnight. Snow likely, possibly mixed with
freezing rain. A slight chance of freezing drizzle after
midnight.
.TUESDAY...East winds 10 to 20 knots backing north in the
afternoon. Snow likely, possibly mixed with freezing rain.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots. A chance of
snow.
.WEDNESDAY...Northwest winds 10 to 20 knots backing west in the
afternoon.
.WEDNESDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight.
.THURSDAY...Southwest winds 5 to 15 knots backing south. A chance
of snow.
.FRIDAY...South winds 5 to 15 knots becoming southwest 10 to
20 knots. Snow likely, then a chance of snow.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-190530-
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-
446 PM EST Sun Feb 18 2018

.LATE THIS AFTERNOON...South winds 20 to 30 knots with a few gale
force gusts to 35 knots. Snow. Waves 3 to 5 feet occasionally to 7
feet.
.TONIGHT...South winds 20 to 30 knots with a few gale force gusts
to 35 knots, becoming west winds 15 to 25 knots late. Snow in the
evening, then a chance of snow and a slight chance of freezing
drizzle after midnight. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 1 to 3 feet.
.MONDAY...North winds 15 to 25 knots increasing to 20 to 30 knots
by late morning, then veering northeast by mid afternoon. A
chance of snow and a slight chance of freezing drizzle in the
morning. A slight chance of freezing rain. Snow likely in the
afternoon. Freezing spray in the afternoon. Waves building to
4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...Northeast winds 20 to 30 knots becoming east
15 to 25 knots late. Heavy freezing spray. Snow likely in the
evening. Freezing rain likely. Freezing drizzle likely and a
slight chance of snow after midnight. Waves building to 5 to
9 feet occasionally to 11 feet.
.TUESDAY...East winds 15 to 25 knots becoming northeast 10 to
20 knots in the afternoon. Heavy freezing spray in the morning.
Freezing drizzle likely in the morning. Freezing rain and snow
likely. A slight chance of freezing drizzle in the afternoon.
Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of freezing drizzle in
the evening. A chance of snow. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. A chance of snow. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots veering southwest. Snow
likely, then a chance of snow. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-190530-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
446 PM EST Sun Feb 18 2018

.LATE THIS AFTERNOON...South winds 20 to 30 knots. Snow likely.
Waves 2 to 4 feet.
.TONIGHT...South winds 20 to 30 knots with a few gale force gusts to
35 knots, becoming southwest winds 10 to 20 knots late. Snow in the
evening, then a chance of snow, possibly mixed with freezing rain
after midnight. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 1 to 3 feet.
.MONDAY...Northwest winds 10 to 20 knots becoming north 15 to
25 knots by late morning, then becoming northeast 20 to 30 knots
by mid afternoon. A chance of freezing drizzle in the morning.
Snow. A slight chance of freezing rain in the afternoon. Freezing
spray in the afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.MONDAY NIGHT...Northeast winds 20 to 30 knots diminishing to
15 to 25 knots by midnight, then veering east late. Freezing
spray. Freezing rain likely in the evening. A chance of snow. A
chance of freezing drizzle after midnight. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.TUESDAY...East winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. A chance of freezing drizzle in the
morning. Freezing rain likely, possibly mixed with snow. A slight
chance of sleet in the afternoon. Waves subsiding to calm to
2 feet.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of freezing rain in the
evening. Waves building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots. Waves building to
3 to 6 feet occasionally to 8 feet, then subsiding to calm to
2 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots becoming west
5 to 15 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots veering southwest. A chance
of snow, then snow likely. Waves calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-190530-
MAFOR 1822/
Superior West 11127 11137 11130 11830 13130 11140. Chance of snow
after midnight tonight. Chance of snow Monday. Waves omitted for
mostly ice covered areas.

Superior North Central 11337 11227 11137 11830 11840 12140 11130.
Chance of snow after midnight tonight. Chance of snow from late
morning on Monday. Waves omitted for mostly ice covered areas.

Superior South Central 11447 12437 11710 12830 12837. Chance of
snow after midnight. Chance of light freezing drizzle and snow
late tonight. Chance of snow through mid morning Monday. Waves
omitted for mostly ice covered areas.

Superior East 13447 19457 11530 11620 11830 12147. Chance of snow
late tonight. Freezing spray from late morning on. Chance of snow
Monday morning. Waves 2 to 4 feet building to 4 to 7 feet, then
subsiding to 2 to 4 feet tonight. Waves 1 to 3 feet building to 4 to
7 feet Monday.

$$

Beachler

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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