Great Lakes Forecast
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FZUS63 KMQT 161442
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
942 AM EST Fri Feb 16 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 30.2 inch ridge over Lake Superior this morning
will remain throughout the day, associated with a weakening 30.6
inch high over the central Plains. The center of the high will
shift to the northeastern U.S. by Saturday morning and a 29.7
inch trough tracks across the Upper Great Lakes Saturday evening.
Brief ridging of 30.1 inches will then pass through the area on
Sunday followed by a trough of 29.7 inches moving in from the
southwest late on Monday. High pressure of 30.6 inches will then
cross into the northern Plains on Tuesday afternoon.

LSZ162-162245-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
942 AM EST Fri Feb 16 2018 /842 AM CST Fri Feb 16 2018/

.REST OF TODAY...West winds 15 to 25 knots increasing to 20 to
30 knots by late morning, then backing southwest by mid
afternoon. Patchy blowing snow.
.TONIGHT...Southwest winds 15 to 25 knots increasing to 20 to
30 knots late. Patchy blowing snow. Scattered snow showers after
midnight.
.SATURDAY...Southwest winds 15 to 25 knots veering west. Patchy
blowing snow. A slight chance of snow showers.
.SATURDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A slight chance of snow showers in the
evening.
.SUNDAY...East winds 5 to 15 knots backing northeast in the
afternoon. Snow showers.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of snow showers.
.MONDAY...Northeast winds 20 to 30 knots. Areas of blowing snow.
Snow showers likely.
.TUESDAY...North winds 5 to 15 knots. A chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ263-162245-
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-
942 AM EST Fri Feb 16 2018

.REST OF TODAY...West winds 15 to 25 knots increasing to 20 to
30 knots by late morning, then backing southwest by mid
afternoon. Patchy blowing snow.
.TONIGHT...Southwest winds 15 to 25 knots increasing to 20 to
30 knots late. Patchy blowing snow. Isolated snow showers after
midnight.
.SATURDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots by mid afternoon. Patchy blowing snow. A chance of snow
showers.
.SATURDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A slight chance of snow showers.
.SUNDAY...Southeast winds 5 to 15 knots backing east in the
afternoon. A chance of snow showers in the morning, then snow
showers in the afternoon.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots increasing to
15 to 25 knots after midnight. A chance of snow showers.
.MONDAY...Northeast winds 20 to 30 knots. Areas of blowing snow.
Snow showers likely.
.TUESDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ264-162245-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
942 AM EST Fri Feb 16 2018

.REST OF TODAY...West winds 10 to 20 knots increasing to 20 to
30 knots by late morning, then backing southwest by mid
afternoon. Patchy blowing snow.
.TONIGHT...Southwest winds 15 to 25 knots. Patchy blowing snow.
Scattered snow showers after midnight.
.SATURDAY...Southwest winds 20 to 30 knots becoming west 15 to
25 knots by mid afternoon. Patchy blowing snow. A chance of snow
showers.
.SATURDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A slight chance of snow showers.
.SUNDAY...West winds 5 to 15 knots backing east in the afternoon.
A chance of snow showers in the morning, then snow showers in the
afternoon.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. Patchy blowing snow. Snow showers likely in the
evening. A chance of snow showers after midnight.
.MONDAY...Northeast winds 20 to 30 knots. Areas of blowing snow.
Snow showers.
.TUESDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ265-162245-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
942 AM EST Fri Feb 16 2018

.REST OF TODAY...West winds 15 to 25 knots. Isolated snow showers
late in the morning. Patchy blowing snow.
.TONIGHT...Southwest winds 15 to 25 knots increasing to 20 to
30 knots late. Isolated snow showers after midnight.
.SATURDAY...Southwest winds 15 to 25 knots veering west by mid
afternoon. A slight chance of snow showers.
.SATURDAY NIGHT...West winds 15 to 25 knots veering northwest
after midnight. A slight chance of snow showers.
.SUNDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon. A chance of snow showers in the
morning, then snow showers in the afternoon.
.SUNDAY NIGHT...North winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Snow showers likely in the evening, then
a chance of snow showers after midnight.
.MONDAY...Northeast winds 20 to 30 knots becoming north 15 to
25 knots. Areas of blowing snow. Snow showers. Snow showers
likely.
.TUESDAY...North winds 10 to 20 knots. A chance of snow showers.

Note, waves omitted for mostly ice covered areas.

$$

LSZ266-162245-
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-
942 AM EST Fri Feb 16 2018

.REST OF TODAY...West winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Isolated snow showers late in the
morning. Patchy blowing snow. Waves 3 to 6 feet occasionally to
8 feet building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...Southwest winds 15 to 25 knots becoming south 20 to
30 knots late. Patchy blowing snow after midnight. Isolated snow
showers after midnight. Waves subsiding to 2 to 4 feet, then
building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...Southwest winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Patchy blowing snow. A chance of snow
showers. Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...West winds 15 to 25 knots veering northwest
after midnight. A chance of snow showers. Waves building to 3 to
6 feet occasionally to 8 feet.
.SUNDAY...West winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon. A chance of snow showers in the
morning, then snow showers in the afternoon. Waves subsiding to
calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots becoming north 15 to
25 knots after midnight. Snow showers likely in the evening, then
a chance of snow showers after midnight. Waves building to 1 to
3 feet.
.MONDAY...Northeast winds 20 to 30 knots. Areas of blowing snow.
Freezing spray. Snow showers. A chance of snow showers. Waves
building to 5 to 8 feet occasionally to 10 feet, then subsiding
to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves subsiding to calm to
2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-162245-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
942 AM EST Fri Feb 16 2018

.REST OF TODAY...West winds 15 to 25 knots. Heavy freezing spray
and patchy blowing snow. Scattered snow showers. Waves 3 to
6 feet occasionally to 8 feet building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming south 15 to
25 knots late. Scattered snow showers after midnight. Waves
subsiding to 1 to 3 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...Southwest winds 20 to 30 knots with a few gale force
gusts to 35 knots in the morning, diminishing to 15 to 25 knots
by mid afternoon. Patchy blowing snow in the morning. A chance of
snow showers. Waves subsiding to 2 to 4 feet.
.SATURDAY NIGHT...West winds 15 to 25 knots. A chance of snow
showers. Freezing spray and patchy blowing snow after midnight.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...West winds 10 to 20 knots backing southeast in the
afternoon. A chance of snow showers in the morning, then snow
showers in the afternoon. Waves subsiding to calm to 2 feet.
.SUNDAY NIGHT...South winds 15 to 25 knots becoming northeast
10 to 20 knots after midnight. Snow showers in the evening, then
a chance of snow showers after midnight. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.MONDAY...Northeast winds 20 to 30 knots. Patchy blowing snow.
Freezing spray. Snow showers. A chance of snow showers. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
2 to 4 feet.
.TUESDAY...North winds 10 to 20 knots. A chance of snow showers.
Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-162245-
MAFOR 1616/
Superior West 11640 15540 11540. Scattered snow showers late
tonight and Saturday morning. Waves omitted for mostly ice
covered areas.

Superior North Central 12640 11530 12520 11530 12540. Chance of
snow showers Saturday morning. Waves omitted for mostly ice
covered areas.

Superior South Central 12630 11520 12510 11520 12530. Waves
omitted for mostly ice covered areas.

Superior East 12642 11632 13530 12540. Heavy freezing spray late
this afternoon then freezing spray late this evening. Chance of
snow showers Saturday morning. Waves 3 to 7 feet.

$$

KCW

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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