Great Lakes Forecast
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FZUS63 KMQT 222055
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
Issued by National Weather Service GAYLORD MI
355 PM EST Thu Feb 22 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 30.7 inch ridge of high pressure extending across
the Upper Great Lakes from southern Quebec will shift east
tonight as a 30.1 inch area of low pressure lifts northeast across
Lake Superior Friday. A stronger (possibly lower and 28.9 inches)
surface low is forecast to cross Lake Superior Sunday.

LSZ162-230500-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
355 PM EST Thu Feb 22 2018 /255 PM CST Thu Feb 22 2018/

.LATE THIS AFTERNOON...East winds less than 10 knots.
.TONIGHT...East winds 5 to 15 knots. A chance of snow in the
evening, then snow after midnight.
.FRIDAY...East winds 5 to 15 knots backing northwest by late
morning, then backing west by mid afternoon. A chance of snow and
a slight chance of freezing drizzle in the morning.
.FRIDAY NIGHT...West winds 5 to 15 knots.
.SATURDAY...Southeast winds less than 10 knots becoming east 5 to
15 knots in the afternoon.
.SATURDAY NIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Snow.
.SUNDAY...West winds 20 to 30 knots. A chance of snow.
.SUNDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of snow.
.MONDAY...Southwest winds 5 to 15 knots.
.TUESDAY...West winds 5 to 15 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-230500-
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-
355 PM EST Thu Feb 22 2018

.LATE THIS AFTERNOON...East winds 5 to 15 knots.
.TONIGHT...East winds 5 to 15 knots. A chance of snow in the
evening, then snow after midnight.
.FRIDAY...East winds 5 to 15 knots backing northwest by late
morning, then becoming west 10 to 20 knots by mid afternoon. Snow
and a slight chance of freezing drizzle in the morning, then
flurries in the afternoon.
.FRIDAY NIGHT...West winds 5 to 15 knots. A slight chance of snow
in the evening.
.SATURDAY...South winds less than 10 knots becoming east 5 to
15 knots in the afternoon.
.SATURDAY NIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. A chance of snow in the evening, then
snow after midnight.
.SUNDAY...West winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. Snow likely in the morning, then a
chance of snow in the afternoon.
.SUNDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of snow.
.MONDAY...Southwest winds 10 to 20 knots.
.TUESDAY...West winds 5 to 15 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-230500-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
355 PM EST Thu Feb 22 2018

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots.
.TONIGHT...Southeast winds 5 to 15 knots becoming east 10 to
20 knots late. A slight chance of snow in the evening, then snow
after midnight.
.FRIDAY...East winds 10 to 20 knots becoming north 5 to 15 knots
by late morning, then becoming northwest 15 to 25 knots by mid
afternoon. Snow in the morning, then a slight chance of snow in
the afternoon.
.FRIDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots late.
.SATURDAY...South winds 5 to 15 knots backing southeast in the
afternoon.
.SATURDAY NIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Snow after midnight.
.SUNDAY...West winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. Snow in the morning, then a chance of
snow in the afternoon.
.SUNDAY NIGHT...West winds 20 to 30 knots. A chance of snow.
.MONDAY...Southwest winds 10 to 20 knots veering west. A chance
of snow.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-230500-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
355 PM EST Thu Feb 22 2018

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots.
.TONIGHT...Southeast winds 5 to 15 knots becoming east 10 to
20 knots late. A chance of snow in the evening, then snow after
midnight.
.FRIDAY...Southeast winds 10 to 20 knots veering west by late
morning, then becoming northwest 20 to 30 knots by mid afternoon.
Snow and a chance of freezing drizzle in the morning, then
flurries in the afternoon.
.FRIDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots late. A slight chance of snow in the evening.
.SATURDAY...Southwest winds 5 to 15 knots backing east in the
afternoon.
.SATURDAY NIGHT...East winds 20 to 30 knots. A chance of snow in
the evening, then snow, possibly mixed with freezing rain after
midnight.
.SUNDAY...West winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. Snow likely in the morning, then a
chance of snow in the afternoon.
.SUNDAY NIGHT...West gales to 35 knots diminishing to 20 to
30 knots after midnight. A chance of snow.
.MONDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots.
.TUESDAY...West winds 10 to 20 knots backing southwest.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-230500-
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-
355 PM EST Thu Feb 22 2018

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots becoming east 15 to
25 knots late. A slight chance of snow in the evening, then snow
after midnight. Waves building to 2 to 4 feet.
.FRIDAY...Southeast winds 15 to 25 knots veering west by late
morning, then becoming northwest 20 to 30 knots by mid afternoon.
Snow and a slight chance of freezing drizzle in the morning, then
flurries in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 15 to 25 knots diminishing to 5 to
15 knots. A slight chance of snow after midnight. Waves building
to 2 to 4 feet, then subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southeast in the
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 20 to 30 knots becoming southeast
gales to 35 knots after midnight. Snow after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Southwest gales to 35 knots becoming west gales to
40 knots in the afternoon. Snow, possibly mixed with rain in the
morning. A chance of snow in the afternoon. Waves subsiding to
3 to 5 feet occasionally to 7 feet, then building to 5 to 8 feet
occasionally to 10 feet.
.SUNDAY NIGHT...West gales to 40 knots. Snow likely in the
evening, then a chance of snow after midnight. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.MONDAY...West winds 15 to 25 knots backing southwest. A chance
of snow. Waves subsiding to calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots backing southwest. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-230500-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
355 PM EST Thu Feb 22 2018

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to
25 knots late. Snow after midnight. Waves building to 2 to
4 feet.
.FRIDAY...Southeast winds 15 to 25 knots veering southwest by
late morning, then becoming west 20 to 30 knots by mid afternoon.
Snow in the morning. A chance of freezing drizzle. Flurries in
the afternoon. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 20 to 30 knots becoming west
15 to 25 knots by midnight, then diminishing to 5 to 15 knots
late. A slight chance of freezing rain and snow after midnight.
Waves building to 2 to 4 feet, then subsiding to calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots backing southeast in
the afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight. Snow, possibly mixed with
freezing rain after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...Southwest gales to 35 knots becoming west gales to
40 knots in the afternoon. Snow, possibly mixed with rain and
freezing rain in the morning, then a chance of snow in the
afternoon. Waves building to 6 to 9 feet occasionally to 11 feet.
.SUNDAY NIGHT...West gales to 40 knots. Snow likely. Freezing
spray after midnight. Waves subsiding to 4 to 7 feet occasionally
to 9 feet.
.MONDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. A chance of snow. Waves subsiding to calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-230500-
MAFOR 2222/
Superior West 12200 11207 11227 11217 11117 11720 11620. Chance
of snow late this evening tonight. Chance of snow early Friday
afternoon. Waves omitted for mostly ice covered areas.

Superior North Central 13310 11317 11227 11327 11817 11720. Waves
omitted for mostly ice covered areas.

Superior South Central 12320 11310 11217 11227 11337 11520 11740.
Chance of light freezing drizzle early Friday afternoon. Waves
omitted for mostly ice covered areas.

Superior East 11310 11420 11320 11327 12337 11437 11640. Chance
of snow after midnight tonight. Chance of light freezing drizzle
early Friday afternoon. Waves 1 to 3 feet building to 2 to 4 feet
tonight. Waves 2 to 4 feet subsiding to 1 to 2 feet Friday.

$$

JPB

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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