Great Lakes Forecast
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FZUS63 KMQT 210847
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
347 AM EST Wed Feb 21 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 high pressure system of 30.6 inches will move across
the Great Lakes this afternoon and drift into southern Quebec on
Thursday. A weak 30.1 inch trough will pass across the western
Great Lakes on Friday followed by weak a ridge of 30.3 inches on
Saturday. A 29.1 inch low pressure system will then track from the
Mid Mississippi Valley into the Upper Great Lakes on Sunday.

LSZ162-211700-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
347 AM EST Wed Feb 21 2018 /247 AM CST Wed Feb 21 2018/

.EARLY THIS MORNING...West winds 10 to 20 knots.
.TODAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots.
.TONIGHT...Southwest winds 15 to 25 knots diminishing to 5 to
15 knots by midnight.
.THURSDAY...Southwest winds less than 10 knots backing south by
late morning, then backing east by mid afternoon.
.THURSDAY NIGHT...East winds 5 to 15 knots. A chance of snow
showers in the evening, then snow showers after midnight.
.FRIDAY...South winds 5 to 15 knots veering west in the
afternoon. Snow showers likely in the morning.
.FRIDAY NIGHT...West winds 5 to 15 knots.
.SATURDAY...East winds 5 to 15 knots. A chance of snow showers,
possibly mixed with freezing rain, then snow showers likely.
.SUNDAY...West winds 15 to 25 knots. A chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-211700-
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-
347 AM EST Wed Feb 21 2018

.EARLY THIS MORNING...West winds 10 to 20 knots. Isolated snow
showers.
.TODAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots. Isolated snow showers in the morning. Patchy blowing
snow in the afternoon.
.TONIGHT...Southwest winds 15 to 25 knots diminishing to 5 to
15 knots by midnight.
.THURSDAY...South winds less than 10 knots increasing to 5 to
15 knots by late morning, then backing east by mid afternoon.
.THURSDAY NIGHT...Southeast winds 5 to 15 knots. A chance of snow
showers in the evening, then snow showers after midnight.
.FRIDAY...South winds 5 to 15 knots veering west in the
afternoon. Snow showers likely in the morning. A chance of snow
showers in the afternoon.
.FRIDAY NIGHT...West winds 5 to 15 knots.
.SATURDAY...East winds 5 to 15 knots increasing to 10 to
20 knots. Snow showers likely.
.SUNDAY...West winds 15 to 25 knots. A chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-211700-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
347 AM EST Wed Feb 21 2018

.EARLY THIS MORNING...West winds 10 to 20 knots. Isolated snow
showers.
.TODAY...West winds 10 to 20 knots increasing to 15 to 25 knots
by late morning, then backing southwest by mid afternoon.
Isolated snow showers in the morning. Patchy blowing snow in the
afternoon.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots by midnight.
.THURSDAY...Southwest winds less than 10 knots becoming south
5 to 15 knots.
.THURSDAY NIGHT...South winds 5 to 15 knots backing southeast
after midnight. A slight chance of snow showers in the evening,
then snow showers likely after midnight.
.FRIDAY...South winds 5 to 15 knots veering west in the
afternoon. Snow showers in the morning. A chance of snow showers
in the afternoon.
.FRIDAY NIGHT...West winds 5 to 15 knots.
.SATURDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots. Snow showers likely.
.SUNDAY...West winds 15 to 25 knots. Patchy blowing snow. A
chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-211700-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
347 AM EST Wed Feb 21 2018

.EARLY THIS MORNING...West winds 15 to 25 knots. Isolated snow
showers.
.TODAY...West winds 15 to 25 knots diminishing to 10 to 20 knots.
Isolated snow showers in the morning.
.TONIGHT...Southwest winds 5 to 15 knots.
.THURSDAY...Southwest winds 5 to 15 knots backing southeast by
late morning, then increasing to 10 to 20 knots by mid afternoon.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots. A slight chance
of snow showers in the evening, then snow showers likely after
midnight.
.FRIDAY...Southeast winds 10 to 20 knots veering west in the
afternoon. Snow showers likely in the morning.
.FRIDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of snow showers.
.SATURDAY...East winds 5 to 15 knots increasing to 10 to
20 knots. Snow showers likely.
.SUNDAY...West winds 15 to 25 knots. Patchy blowing snow. A
chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-211700-
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-
347 AM EST Wed Feb 21 2018

.EARLY THIS MORNING...Northwest winds 15 to 25 knots. Isolated
snow showers. Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...West winds 15 to 25 knots diminishing to 10 to 20 knots.
Isolated snow showers in the morning. Waves subsiding to 1 to
3 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Waves subsiding to calm
to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing south by late
morning, then backing southeast by mid afternoon. Waves calm to
2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots. A slight chance
of snow showers in the evening, then snow showers likely after
midnight. Waves building to 1 to 3 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering west in the
afternoon. Snow showers likely in the morning. A chance of
freezing rain. A chance of snow showers in the afternoon. Waves
subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of freezing rain and snow
showers. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming east 15 to
25 knots. Snow showers likely. Waves building to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...West winds 20 to 30 knots. Patchy blowing snow. A
chance of snow showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet, then building to 4 to 7 feet occasionally
to 9 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-211700-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
347 AM EST Wed Feb 21 2018

.EARLY THIS MORNING...Northwest winds 20 to 30 knots. Heavy
freezing spray and patchy blowing snow. Isolated snow showers.
Waves 4 to 7 feet occasionally to 9 feet.
.TODAY...Northwest winds 15 to 25 knots backing west by late
morning, then diminishing to 10 to 20 knots by mid afternoon.
Heavy freezing spray in the morning. Isolated snow showers. Waves
subsiding to 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots backing south by midnight,
then veering southwest late. Waves subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing south by late
morning, then backing southeast by mid afternoon. Waves calm to
2 feet.
.THURSDAY NIGHT...Southeast winds 10 to 20 knots. A chance of
snow showers after midnight. Waves building to 1 to 3 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering southwest in the
afternoon. Snow showers in the morning. A chance of freezing
rain. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots. A chance of freezing
rain, possibly mixed with snow showers. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots becoming southeast 15 to
25 knots. Snow showers likely. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...West winds 20 to 30 knots. Patchy blowing snow. Snow
showers. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 5 feet occasionally to 7 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-211700-
MAFOR 2110/
Superior West 12620 14530 12510. Waves omitted for mostly ice
covered areas.

Superior North Central 12620 12630 11530 12520 11510. Waves
omitted for mostly ice covered areas.

Superior South Central 14620 11610 12400 11500. Waves omitted for
mostly ice covered areas.

Superior East 11742 11732 11630 13620 11520 11510. Waves 4 to 7
feet subsiding to 2 to 4 feet today. Waves 1 to 3 feet tonight.

$$

Titus

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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