Great Lakes Forecast
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347
FZUS63 KMQT 230914
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
414 AM EST Fri Feb 23 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 30.1 inch area of low pressure from the Central
Plains will lift northeast across Lake Superior today. A weak
ridge of 30.3 inches will cross Lake Superior on Saturday. A 29.0
inch low will cross the Great Lakes Saturday night through Sunday.
A 30.0 inch ridge will then build into the Upper Great Lakes on
Monday as a 29.5 inch low moves across southern Saskatchewan. By
Tuesday morning, a 29.8 inch low will move into western Ontario as
a 30.3 inch high pressure moves over the eastern Great Lakes.

LSZ162-231715-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
414 AM EST Fri Feb 23 2018 /314 AM CST Fri Feb 23 2018/

...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
EVENING...

.EARLY THIS MORNING...East winds 5 to 15 knots. Snow.
.TODAY...East winds 5 to 15 knots becoming west 10 to 20 knots by
late morning, then diminishing to 5 to 15 knots by mid afternoon.
A chance of snow in the morning.
.TONIGHT...West winds 5 to 15 knots.
.SATURDAY...Southwest winds less than 10 knots backing south by
late morning, then becoming east 5 to 15 knots by mid afternoon.
.SATURDAY NIGHT...East winds 15 to 25 knots. Snow.
.SUNDAY...West winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. 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 increasing to 10 to
20 knots.
.TUESDAY...West winds 5 to 15 knots becoming east less than
10 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-231715-
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-
414 AM EST Fri Feb 23 2018

...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH SUNDAY
EVENING...

.EARLY THIS MORNING...East winds 5 to 15 knots. Snow.
.TODAY...East winds 5 to 15 knots becoming west 10 to 20 knots.
Snow in the morning.
.TONIGHT...West winds 5 to 15 knots.
.SATURDAY...Southwest winds less than 10 knots backing south by
late morning, then becoming east 5 to 15 knots by mid 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 gales to 35 knots. 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 increasing to 15 to
25 knots.
.TUESDAY...West winds 10 to 20 knots becoming east 5 to 15 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-231715-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
414 AM EST Fri Feb 23 2018

...GALE WATCH IN EFFECT FROM LATE SATURDAY NIGHT THROUGH SUNDAY
EVENING...

.EARLY THIS MORNING...East winds 10 to 20 knots. Snow.
.TODAY...Southeast winds 5 to 15 knots becoming west 10 to
20 knots by late morning, then veering northwest by mid
afternoon. Snow in the morning.
.TONIGHT...West winds 5 to 15 knots increasing to 10 to 20 knots
by midnight, then diminishing to 5 to 15 knots late.
.SATURDAY...South winds 5 to 15 knots backing southeast by mid
afternoon.
.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 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 15 to
25 knots after midnight. A chance of snow.
.MONDAY...Southwest winds 15 to 25 knots.
.TUESDAY...West winds 10 to 20 knots becoming northeast 5 to
15 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-231715-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
414 AM EST Fri Feb 23 2018

...GALE WATCH IN EFFECT FROM LATE SATURDAY NIGHT THROUGH SUNDAY
EVENING...

.EARLY THIS MORNING...East winds 15 to 25 knots. Patchy blowing
snow. Snow.
.TODAY...Southeast winds 10 to 20 knots becoming west 5 to
15 knots by late morning, then increasing to 15 to 25 knots by
mid afternoon. Patchy blowing snow in the morning. Snow, possibly
mixed with freezing rain in the morning.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
by midnight.
.SATURDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon.
.SATURDAY NIGHT...East winds 20 to 30 knots veering southeast
after midnight. A chance of snow in the evening, then snow,
possibly mixed with rain and freezing rain after midnight.
.SUNDAY...West gales to 40 knots. Snow and drizzle likely in the
morning, then a chance of snow and drizzle 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 increasing to 15 to
25 knots.
.TUESDAY...West winds 10 to 20 knots becoming east 5 to 15 knots.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-231715-
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-
414 AM EST Fri Feb 23 2018

...GALE WATCH IN EFFECT FROM LATE SATURDAY NIGHT THROUGH SUNDAY
EVENING...

.EARLY THIS MORNING...Southeast winds 10 to 20 knots. Snow. Waves
1 to 3 feet.
.TODAY...Southeast winds 10 to 20 knots becoming southwest 5 to
15 knots by late morning, then becoming west 15 to 25 knots by
mid afternoon. Snow, possibly mixed with freezing rain in the
morning. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing south by late
morning, then becoming southeast 10 to 20 knots by mid afternoon.
Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 20 to 30 knots becoming southeast
gales to 40 knots after midnight. A slight chance of snow in the
evening, then snow, possibly mixed with rain after midnight.
Waves building to 4 to 8 feet occasionally to 10 feet.
.SUNDAY...West gales to 40 knots. Snow, possibly mixed with rain
and drizzle likely in the morning, then a chance of snow and
drizzle in the afternoon. Waves subsiding to 2 to 4 feet, then
building to 7 to 10 feet occasionally to 13 feet.
.SUNDAY NIGHT...West gales to 40 knots diminishing to 20 to
30 knots after midnight. A chance of snow. Waves subsiding to
4 to 7 feet occasionally to 9 feet.
.MONDAY...West winds 15 to 25 knots backing southwest. Waves
subsiding to 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots becoming northeast 5 to
15 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-231715-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
414 AM EST Fri Feb 23 2018

...GALE WATCH IN EFFECT FROM LATE SATURDAY NIGHT THROUGH SUNDAY
EVENING...

.EARLY THIS MORNING...Southeast winds 10 to 20 knots. Snow. Waves
1 to 3 feet.
.TODAY...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. Waves
subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...Northwest winds 15 to 25 knots becoming west 10 to
20 knots by midnight, then diminishing to 5 to 15 knots late. A
slight chance of freezing drizzle. Waves subsiding to calm to
2 feet.
.SATURDAY...Southwest winds 5 to 15 knots backing south by late
morning, then becoming southeast 10 to 20 knots by mid afternoon.
Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 20 to 30 knots becoming southeast
gales to 40 knots after midnight. Snow after midnight. Waves
building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Southwest gales to 40 knots becoming west in the
afternoon. Snow, possibly mixed with rain in the morning, then a
chance of snow and drizzle in the afternoon. Waves subsiding to 1
to 3 feet, then building to 7 to 10 feet occasionally to 13 feet.
.SUNDAY NIGHT...West gales to 35 knots diminishing to 20 to
30 knots after midnight. A chance of snow. Waves subsiding to
4 to 7 feet occasionally to 9 feet.
.MONDAY...West winds 15 to 25 knots backing southwest. Waves
subsiding to 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots veering northeast. Waves
building to 2 to 4 feet, then subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-231715-
MAFOR 2310/
Superior West 11227 11110 11720 11620 14610. Chance of snow late
this morning today. Waves omitted for mostly ice covered areas.

Superior North Central 11227 11327 11610 12720 12600 11700. Waves
omitted for mostly ice covered areas.

Superior South Central 12327 11510 12630 12610 11600. Chance of
snow late this morning today. Waves omitted for mostly ice
covered areas.

Superior East 12327 11527 11630 12730 11720 11710. Chance of
freezing rain early this afternoon. Waves 1 to 3 feet building to
2 to 4 feet today. Waves 3 to 5 feet subsiding to 2 feet or less
tonight.

$$

Voss

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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