Great Lakes Forecast
Issued by NWS

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FZUS63 KMQT 221556
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
Issued by National Weather Service GAYLORD MI
1056 AM 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 high pressure system over the Great Lakes
today will shift into southern Quebec tonight. A weak 30.0 inch
low will then pass across the western Great Lakes on Friday
followed by weak a ridge of 30.3 inches on Saturday. A low
averaging 29.0 inches will track across the Great Lakes region
Saturday night through Sunday. A 30.3 inch ridge will then build
into the Upper Great Lakes on Monday as a 29.6 inch low moves
across southern Saskatchewan.

LSZ162-230000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1056 AM EST Thu Feb 22 2018 /956 AM CST Thu Feb 22 2018/

.REST OF TODAY...Southwest winds 5 to 15 knots backing south by
late morning, then becoming east less than 10 knots by mid
afternoon.
.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. Snow and a slight
chance of freezing drizzle in the morning, then a slight chance
of snow in the afternoon.
.FRIDAY NIGHT...West winds 5 to 15 knots.
.SATURDAY...South winds less than 10 knots becoming east 5 to
15 knots in the afternoon. A slight chance of snow in the
afternoon.
.SATURDAY NIGHT...East winds 10 to 20 knots becoming northeast
15 to 25 knots after midnight. Snow.
.SUNDAY...West winds 15 to 25 knots. A chance of snow.
.MONDAY...West winds 5 to 15 knots backing southwest.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-230000-
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-
1056 AM EST Thu Feb 22 2018

.REST OF TODAY...Southwest winds 5 to 15 knots backing south.
.TONIGHT...East winds 5 to 15 knots veering southeast by
midnight, then backing east late. A chance of snow in the
evening, then snow after midnight.
.FRIDAY...East winds 5 to 15 knots veering west. Snow in the
morning. A slight chance of freezing drizzle. A chance of snow 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. A slight chance of snow in the
afternoon.
.SATURDAY NIGHT...East winds 15 to 25 knots. Snow likely in the
evening, then snow after midnight.
.SUNDAY...West winds 20 to 30 knots. A chance of snow.
.MONDAY...West winds 5 to 15 knots backing southwest.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-230000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1056 AM EST Thu Feb 22 2018

.REST OF TODAY...Southwest winds 5 to 15 knots backing south by
mid afternoon.
.TONIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots late. A chance of snow in the evening, then snow after
midnight.
.FRIDAY...Southeast winds 10 to 20 knots becoming west 5 to
15 knots by late morning, then becoming northwest 10 to 20 knots
by mid afternoon. Snow, possibly mixed with freezing rain in the
morning. A chance of freezing drizzle. A chance of snow in the
afternoon.
.FRIDAY NIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. A slight chance of snow in the evening.
.SATURDAY...South winds 5 to 15 knots becoming southeast 10 to
20 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. Snow likely, then a chance
of snow.
.MONDAY...West winds 10 to 20 knots backing southwest. A chance
of snow.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-230000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1056 AM EST Thu Feb 22 2018

.REST OF TODAY...Southwest winds less than 10 knots becoming
southeast 5 to 15 knots by mid afternoon.
.TONIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by midnight, then backing east late. A chance of snow in
the evening, then snow after midnight.
.FRIDAY...Southeast winds 10 to 20 knots veering southwest by
late morning, then becoming west 15 to 25 knots by mid afternoon.
Snow, possibly mixed with freezing rain in the morning. A chance
of freezing drizzle. A slight chance of drizzle in the afternoon.
.FRIDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A slight chance of freezing drizzle in
the evening. A slight chance of snow.
.SATURDAY...South winds 5 to 15 knots becoming southeast 10 to
20 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, possibly mixed with freezing rain after midnight.
.SUNDAY...West winds 20 to 30 knots. A chance of snow.
.MONDAY...West winds 10 to 20 knots backing southwest.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-230000-
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-
1056 AM EST Thu Feb 22 2018

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

Note, wave height forecasts are for ice free areas.

$$

LSZ267-230000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1056 AM EST Thu Feb 22 2018

.REST OF TODAY...Southwest winds 5 to 15 knots backing southeast
by mid afternoon. Waves calm to 2 feet.
.TONIGHT...Southeast winds 10 to 20 knots increasing to 15 to
25 knots late. A chance of snow. Waves building to 2 to 4 feet.
.FRIDAY...Southeast winds 15 to 25 knots veering south by late
morning, then becoming west 10 to 20 knots by mid afternoon.
Snow, possibly mixed with freezing rain in the morning, then a
chance of freezing drizzle and drizzle in the afternoon. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.FRIDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
5 to 15 knots after midnight. A slight chance of freezing
drizzle. A slight chance of snow after midnight. Waves building
to 2 to 4 feet, then subsiding to calm to 2 feet.
.SATURDAY...South 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...West gales to 35 knots. Rain, possibly mixed with
freezing rain and freezing drizzle. Snow. Waves building to 6 to
9 feet occasionally to 11 feet, then 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.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-230000-
MAFOR 2216/
Superior West 11400 11300 12200 11207 11227 11217 11207. Chance
of snow late this evening. Waves omitted for mostly ice covered
areas.

Superior North Central 11500 11400 13310 11317 12327. Waves
omitted for mostly ice covered areas.

Superior South Central 11700 11300 12310 11317 11217 11227 11327.
Waves omitted for mostly ice covered areas.

Superior East 11500 11400 11310 11420 11320 13327. Chance of snow
after midnight tonight. Waves 1 foot or less this afternoon.
Waves 1 to 3 feet building to 2 to 4 feet tonight. Waves 2 to 4
feet Friday morning.

$$

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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