Great Lakes Forecast
Issued by NWS

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
624
FZUS63 KMQT 170857
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
357 AM EST Fri Nov 17 2017

For waters beyond five nautical miles of shore on Lake Superior

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 30.3 inch ridge over the Great Lakes will reach
Quebec this evening as a 29.6 inch trough moves over the western
Great Lakes. The trough will move eastward through the weekend,
merging with a stronger trough that will race across the Central
Plains. This low will strengthen to around 29.0 inches across the
Lower Great Lakes Saturday night. A 30.2 inch high will drop
southeast across the Northern and Central Plains Saturday and
Sunday, extending a 30 inch ridge just south of Lake Superior into
Sunday night. Then, a 29.3 inch trough will move through Alberta
and Saskatchewan toward the Upper Great Lakes on Monday evening
and will reach Southern Quebec Tuesday night.

LSZ162-171700-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
357 AM EST Fri Nov 17 2017 /257 AM CST Fri Nov 17 2017/

.EARLY THIS MORNING...South winds 20 to 30 knots. A slight chance
of rain and snow. Waves 4 to 7 feet occasionally to 9 feet.
.TODAY...South winds 15 to 25 knots veering southwest by late
morning, then diminishing to 10 to 20 knots by mid afternoon.
Rain, possibly mixed with snow. Waves subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 5 to 15 knots becoming north 10 to
20 knots by midnight, then increasing to 15 to 25 knots late.
Patchy drizzle in the evening. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.SATURDAY...North winds 15 to 25 knots backing northwest. Waves
building to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots. A chance of
snow showers. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots becoming southwest 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming west 20 to 30 knots.
Waves building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...Northwest winds 20 to 30 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet.

$$

LSZ263-171700-
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-
357 AM EST Fri Nov 17 2017

.EARLY THIS MORNING...South winds 20 to 30 knots. A slight chance
of rain and snow. Waves 4 to 7 feet occasionally to 9 feet.
.TODAY...South winds 20 to 30 knots veering southwest by late
morning, then diminishing to 10 to 20 knots by mid afternoon.
Rain, possibly mixed with snow. Waves subsiding to 2 to 4 feet.
.TONIGHT...West winds 5 to 15 knots becoming north 10 to 20 knots
by midnight, then increasing to 15 to 25 knots late. A chance of
drizzle in the evening. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.SATURDAY...North winds 15 to 25 knots. A slight chance of snow
showers in the afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SATURDAY NIGHT...Northwest winds 15 to 25 knots. Snow showers
likely in the evening, then a chance of snow showers after
midnight. Waves building to 3 to 6 feet occasionally to 8 feet.
.SUNDAY...Northwest winds 15 to 25 knots backing west in the
afternoon. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming west 20 to 30 knots.
Waves building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of snow showers. Waves building to 5 to 8 feet
occasionally to 10 feet, then subsiding to 1 to 3 feet.

$$

LSZ264-171700-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
357 AM EST Fri Nov 17 2017

...GALE WARNING IN EFFECT THROUGH THIS AFTERNOON...

.EARLY THIS MORNING...South gales to 35 knots. A chance of snow.
Waves 5 to 9 feet occasionally to 11 feet.
.TODAY...South gales to 35 knots becoming southwest 15 to
25 knots by mid afternoon. Rain and snow. Waves building to 9 to
12 feet occasionally to 15 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.
.TONIGHT...West winds 5 to 15 knots becoming north 15 to 25 knots
by midnight. A chance of drizzle in the evening. Waves subsiding
to 2 to 4 feet, then building to 3 to 5 feet occasionally to
7 feet.
.SATURDAY...North winds 15 to 25 knots increasing to 20 to
30 knots by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY NIGHT...North winds 20 to 30 knots backing northwest
after midnight. Snow showers likely. Waves building to 5 to
9 feet occasionally to 11 feet.
.SUNDAY...Northwest winds 15 to 25 knots backing west in the
afternoon. A chance of snow showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight. A chance of snow showers and freezing
drizzle. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming west 15 to
25 knots. Waves building to 5 to 8 feet occasionally to 10 feet.
.TUESDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots. A chance of snow showers. Waves building to 7 to
10 feet occasionally to 13 feet, then subsiding to 2 to 4 feet.

$$

LSZ265-171700-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
357 AM EST Fri Nov 17 2017

...GALE WARNING IN EFFECT THROUGH THIS AFTERNOON...

.EARLY THIS MORNING...South winds 20 to 30 knots. A chance of
snow. Waves 3 to 6 feet occasionally to 8 feet building to 4 to
7 feet occasionally to 9 feet.
.TODAY...South gales to 35 knots diminishing to 20 to 30 knots by
mid afternoon. Snow likely in the morning. Rain. Waves building
to 8 to 11 feet occasionally to 14 feet, then subsiding to 3 to
5 feet occasionally to 7 feet.
.TONIGHT...West winds 10 to 20 knots veering northwest by
midnight, then becoming north 15 to 25 knots late. Snow likely,
possibly mixed with rain in the evening. A chance of drizzle.
Waves subsiding to calm to 2 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...North winds 20 to 30 knots backing northwest by mid
afternoon. A slight chance of drizzle. A slight chance of
freezing drizzle and snow showers in the afternoon. Waves
building to 6 to 9 feet occasionally to 11 feet.
.SATURDAY NIGHT...North winds 20 to 30 knots backing northwest
after midnight. A slight chance of freezing drizzle in the
evening. Snow showers likely. Waves building to 7 to 10 feet
occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.SUNDAY...Northwest winds 20 to 30 knots backing west in the
afternoon. A chance of snow showers in the morning, then snow
showers likely in the afternoon. Waves subsiding to 2 to 4 feet.
.SUNDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of snow showers. Waves
subsiding to calm to 2 feet.
.MONDAY...South winds 10 to 20 knots becoming southwest 15 to
25 knots. Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots. A chance of rain showers. Snow showers likely. Waves
building to 6 to 9 feet occasionally to 11 feet, then subsiding
to 2 to 4 feet.

$$

LSZ266-171700-
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-
357 AM EST Fri Nov 17 2017

...GALE WARNING IN EFFECT THROUGH THIS AFTERNOON...

.EARLY THIS MORNING...South gales to 35 knots. A slight chance of
snow. Waves 4 to 8 feet occasionally to 10 feet.
.TODAY...South gales to 40 knots. A chance of snow in the
morning. Rain. Waves building to 9 to 12 feet occasionally to
15 feet, then subsiding to 5 to 8 feet occasionally to 10 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering northwest by
midnight, then becoming north 15 to 25 knots late. Rain in the
evening. A chance of drizzle. Waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.SATURDAY...North winds 20 to 30 knots increasing to gales to
35 knots. A slight chance of drizzle. A slight chance of freezing
drizzle in the afternoon. Waves building to 7 to 10 feet
occasionally to 13 feet.
.SATURDAY NIGHT...North gales to 35 knots. A slight chance of
drizzle and freezing drizzle in the evening. Snow showers likely.
Waves building to 9 to 12 feet occasionally to 15 feet.
.SUNDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Snow showers likely. Waves subsiding
to 4 to 7 feet occasionally to 9 feet.
.SUNDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Snow showers likely in the evening, then
a chance of snow showers after midnight. Waves subsiding to 1 to
3 feet.
.MONDAY...South winds 15 to 25 knots veering southwest. Waves
subsiding to calm to 2 feet, then building to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY...Northwest gales to 35 knots. A chance of rain showers.
Snow showers likely. Waves building to 10 to 14 feet occasionally
to 18 feet, then subsiding to 3 to 6 feet occasionally to 8 feet.

$$

LSZ267-171700-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
357 AM EST Fri Nov 17 2017

...GALE WARNING IN EFFECT THROUGH THIS AFTERNOON...

.EARLY THIS MORNING...Southeast winds 20 to 30 knots. Waves 2 to
4 feet building to 3 to 5 feet occasionally to 7 feet.
.TODAY...Southeast gales to 35 knots becoming south gales to
40 knots. A chance of snow, possibly mixed with rain in the
morning, then rain, possibly mixed with snow in the afternoon.
Waves building to 6 to 9 feet occasionally to 11 feet, then
subsiding to 4 to 7 feet occasionally to 9 feet.
.TONIGHT...South winds 20 to 30 knots becoming northwest 15 to
25 knots by midnight, then becoming north 10 to 20 knots late.
Rain in the evening, then a chance of drizzle after midnight.
Waves subsiding to 1 to 3 feet.
.SATURDAY...North winds 15 to 25 knots increasing to gales to
35 knots. A chance of drizzle. Waves building to 5 to 8 feet
occasionally to 10 feet.
.SATURDAY NIGHT...North gales to 40 knots. A chance of snow
showers, drizzle and a slight chance of freezing drizzle in the
evening, then snow showers likely after midnight. Waves building
to 8 to 11 feet occasionally to 14 feet.
.SUNDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots in the afternoon. Snow showers likely. Waves subsiding
to 4 to 7 feet occasionally to 9 feet.
.SUNDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Snow showers likely in the evening, then
a chance of snow showers after midnight. Waves subsiding to 2 to
4 feet.
.MONDAY...South winds 10 to 20 knots becoming southwest 20 to
30 knots. A chance of rain showers. Waves subsiding to 1 to
3 feet, then building to 5 to 8 feet occasionally to 10 feet.
.TUESDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots. A chance of rain showers. Snow showers likely. Waves
building to 10 to 14 feet occasionally to 18 feet, then subsiding
to 3 to 6 feet occasionally to 8 feet.

$$

LSZ261-171700-
MAFOR 1710/
Superior West 11440 11447 11537 11526 11515 11710 11720 11820.
Chance of rain and snow through mid morning. Areas of drizzle
with a chance of rain through early evening tonight. Waves 3 to 6
feet subsiding to 2 to 4 feet today. Waves 1 to 3 feet tonight.

Superior North Central...Gale Warning in effect...11450 12457
11447 11526 11610 11730 11830. Chance of snow this morning.
Chance of drizzle late this evening. Waves 5 to 8 feet building
to 8 to 12 feet, then subsiding to 6 to 9 feet today. Waves 4 to
7 feet subsiding to 3 to 5 feet tonight.

Superior South Central...Gale Warning in effect...11450 12457
11456 11436 11517 11720 11730. Chance of snow early this morning,
then chance of snow and rain through mid morning. Chance of rain
after midnight tonight. Waves 5 to 8 feet building to 5 to 9 feet
today. Waves 3 to 5 feet subsiding to 1 to 3 feet tonight.

Superior East...Gale Warning in effect...11340 11450 12456 11446
11536 11610 11820. Chance of snow and rain late this morning
today. Chance of rain after midnight tonight. Waves 3 to 5 feet
building to 7 to 11 feet today. Waves 5 to 8 feet subsiding to 2
to 4 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



USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.