Great Lakes Forecast
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FZUS63 KMQT 200240
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
940 PM 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...Troughing of 29.8 inches will push slowly
northeastward through the Western Great Lakes overnight and into
Tuesday, reaching Quebec on Wednesday. A high pressure system of
30.6 inches will then push towards the Great Lakes Wednesday
afternoon and drift into southern Quebec Thursday. A weak 30.1
inch trough will pass across the western Great Lakes on Friday
followed by weak ridge of 30.3 inches on Saturday.

LSZ162-201045-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
940 PM EST Mon Feb 19 2018 /840 PM CST Mon Feb 19 2018/

.REST OF TONIGHT...Northeast winds 20 to 30 knots with a few gale
force gusts to 35 knots. Areas of blowing snow. Snow likely.
.TUESDAY...Northeast winds 20 to 30 knots becoming north 10 to
20 knots by mid afternoon. Areas of blowing snow in the morning.
Snow, possibly mixed with freezing rain in the morning, then a
chance of snow in the afternoon.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots backing west late.
A slight chance of snow.
.WEDNESDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots in the afternoon. A slight chance of snow showers in the
morning.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight.
.THURSDAY...Southwest winds 5 to 15 knots backing south in the
afternoon.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. A chance of snow in the evening, then snow likely
after midnight.
.FRIDAY...West winds 5 to 15 knots.
.SATURDAY...Southwest winds 5 to 15 knots backing south. A chance
of snow.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-201045-
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-
940 PM EST Mon Feb 19 2018

.REST OF TONIGHT...Northeast winds 20 to 30 knots with a few gale
force gusts to 35 knots. Areas of blowing snow. Snow likely.
.TUESDAY...Northeast winds 20 to 30 knots becoming north 10 to
20 knots by mid afternoon. Snow, possibly mixed with freezing
rain. Areas of blowing snow.
.TUESDAY NIGHT...Northwest winds 5 to 15 knots backing west late.
A chance of snow.
.WEDNESDAY...West winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A slight chance of snow showers in the
morning.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight.
.THURSDAY...Southwest winds 5 to 15 knots backing south in the
afternoon.
.THURSDAY NIGHT...South winds 5 to 15 knots. A chance of snow in
the evening, then snow likely after midnight.
.FRIDAY...West winds 5 to 15 knots.
.SATURDAY...Southwest winds 5 to 15 knots backing south. A chance
of snow.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-201045-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
940 PM EST Mon Feb 19 2018

.REST OF TONIGHT...Northeast winds 20 to 30 knots. Areas of
blowing snow. Snow likely.
.TUESDAY...Northeast winds 20 to 30 knots diminishing to 15 to
25 knots by late morning, then becoming north 10 to 20 knots by
mid afternoon. Areas of blowing snow. Snow with a slight chance
of freezing rain.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots. A chance of
snow.
.WEDNESDAY...West winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon. A slight chance of snow showers.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight.
.THURSDAY...Southwest winds 5 to 15 knots backing south in the
afternoon.
.THURSDAY NIGHT...South winds 5 to 15 knots. A chance of snow in
the evening, then snow likely after midnight.
.FRIDAY...Southwest winds 5 to 15 knots veering west. Snow
likely.
.SATURDAY...Southwest winds 5 to 15 knots backing south.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-201045-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
940 PM EST Mon Feb 19 2018

.REST OF TONIGHT...Northeast winds 20 to 30 knots veering east
late. Areas of blowing snow. Snow, possibly mixed with freezing
rain.
.TUESDAY...East winds 15 to 25 knots diminishing to 5 to 15 knots
by late morning, then becoming north 10 to 20 knots by mid
afternoon. Snow, possibly mixed with freezing rain.
.TUESDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots by midnight, then diminishing to 10 to 20 knots
late. A slight chance of snow and freezing drizzle in the
evening.
.WEDNESDAY...West winds 10 to 20 knots.
.WEDNESDAY NIGHT...Southwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight.
.THURSDAY...Southwest winds 5 to 15 knots backing southeast in
the afternoon.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots. A chance of
snow in the evening, then snow likely after midnight.
.FRIDAY...West winds 10 to 20 knots.
.SATURDAY...Southwest winds 10 to 20 knots backing south. A
chance of snow.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-201045-
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-
940 PM EST Mon Feb 19 2018

.REST OF TONIGHT...Northeast winds 20 to 30 knots veering east
late. Areas of freezing spray and blowing snow. Periods of snow,
sleet, and freezing drizzle. Waves 7 to 10 feet occasionally to 13
feet.
.TUESDAY...East winds 20 to 30 knots diminishing to 10 to
20 knots by late morning, then becoming west 5 to 15 knots by mid
afternoon. Freezing spray and patchy blowing snow in the morning.
A chance of freezing rain and snow in the morning. Freezing
drizzle likely in the afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots. A slight chance
of freezing drizzle. Waves building to 3 to 6 feet occasionally
to 8 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon. A slight chance of snow showers. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing south in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. Snow likely after
midnight. Waves building to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots veering west. Snow likely.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.SATURDAY...Southwest winds 10 to 20 knots backing south. A
chance of snow. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-201045-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
940 PM EST Mon Feb 19 2018

.REST OF TONIGHT...East winds 20 to 30 knots diminishing to 15 to
25 knots by midnight. Areas of freezing spray and blowing snow.
Periods of snow, sleet, and freezing drizzle. Waves 4 to 8 feet
occasionally to 10 feet.
.TUESDAY...East winds 15 to 25 knots becoming southeast 10 to
20 knots by late morning, then becoming southwest 5 to 15 knots
by mid afternoon. Freezing rain likely, possibly mixed with snow
and sleet. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots becoming northwest
20 to 30 knots by midnight. A chance of freezing drizzle and a
slight chance of snow. Freezing spray after midnight. Waves
building to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...Northwest winds 15 to 25 knots becoming west 10 to
20 knots in the afternoon. A slight chance of snow showers. Waves
subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing south in the
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots. Snow likely
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots veering west. Snow likely.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 10 to 20 knots backing southeast. A
chance of snow. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-201045-
MAFOR 2004/
Superior West 13147 19157 12147 11130 11710 11720. Freezing spray
and occasional snow. Waves omitted for mostly ice covered areas.

Superior North Central 14147 11137 11127 11820 11720. Snow, at
times mixed with sleet and freezing rain. Waves omitted for
mostly ice covered areas.

Superior South Central 12137 11230 11237 11210 11810 12720.
Snow, at times mixed with sleet and freezing rain. Waves omitted
for mostly ice covered areas.

Superior East 12247 11242 11240 11230 11310 11610 11720. Freezing spray
and occasional snow, at times mixed with sleet and freezing rain.
Waves 6 to 10 feet overnight subsiding to 2 to 4 feet Tuesday.

$$

Borchardt

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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