Great Lakes Forecast
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000
FZUS63 KMQT 190245
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
945 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 stretching through the Upper
Great Lakes will weaken to 29.9 inches by 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.

LSZ162-191000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
945 PM EST Sun Feb 18 2018 /845 PM CST Sun Feb 18 2018/

.REST OF TONIGHT...Northeast winds 15 to 25 knots backing north
by midnight. Patchy blowing snow. Snow showers through late in
the evening, then a chance of snow showers 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.
.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.

$$

LSZ263-191000-
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-
945 PM EST Sun Feb 18 2018

.REST OF TONIGHT...Northeast winds 15 to 25 knots backing north
by midnight. Patchy blowing snow. Snow showers through late in
the evening. A chance of snow showers 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.

$$

LSZ264-191000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
945 PM EST Sun Feb 18 2018

.REST OF TONIGHT...Northeast winds 15 to 25 knots backing north
by midnight. Snow showers through late in the evening, then a
chance of snow showers after midnight. Patchy blowing 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.

$$

LSZ265-191000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
945 PM EST Sun Feb 18 2018

.REST OF TONIGHT...South winds 15 to 25 knots diminishing to
10 to 20 knots by midnight, then becoming north 15 to 25 knots
late. Snow showers likely through late in the evening, then a
chance of snow showers 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.

$$

LSZ266-191000-
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-
945 PM EST Sun Feb 18 2018

.REST OF TONIGHT...South winds 20 to 30 knots with a few gale
force gusts to 35 knots, becoming west winds 15 to 25 knots late.
Patchy blowing snow late in the evening. Snow showers through late
in the evening, then a chance of snow showers and a slight chance
of freezing drizzle after midnight. Waves 4 to 7 feet
occasionally to 9 feet 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.

$$

LSZ267-191000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
945 PM EST Sun Feb 18 2018

.REST OF 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 showers likely through late in the evening, then a
chance of snow showers, possibly mixed with freezing drizzle
after midnight. Waves 3 to 6 feet occasionally to 8 feet 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.

$$
LSZ261-191000-
MAFOR 1904/
Superior West 11137 11830 12130 11132 13147. Freezing spray after
midnight overnight. Heavy freezing spray Monday afternoon. Chance
of snow showers through early afternoon Monday. Waves omitted for
mostly ice covered areas.

Superior North Central 11137 11830 11840 12140 11130 11140 11130.
Chance of snow showers. Waves omitted for mostly ice covered
areas.

Superior South Central 11430 11710 13830 11837 12137. Chance of
snow showers. Chance of light freezing rain late Monday evening.
Waves omitted for mostly ice covered areas.

Superior East 11457 11537 11620 11830 11140 13147. Chance of snow
showers. Freezing spray Monday afternoon. Chance of light
freezing rain late Monday evening. Waves 4 to 7 feet subsiding to
2 to 4 feet overnight. Waves 1 to 3 feet building to 4 to 8 feet
by late Monday.

$$

MZ

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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