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
000
FZUS63 KMQT 040900
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
400 AM EST Mon Dec 4 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...Low pressure of 29.4 inches over eastern South Dakota
into eastern Nebraska this morning will deepen to 29.0 inches over
western Lake Superior Monday night and 28.8 inches over northern
Ontario Tuesday afternoon. The low will weaken to 29.1 inches over
James Bay Wednesday and then continue to push north through Thursday
as a 30.4 inch ridge moves over the central Plains. The ridge will
dissipate by Friday morning as a 29.8 inch low forms over the Upper
Great Lakes.

LSZ162-041700-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
400 AM EST Mon Dec 4 2017 /300 AM CST Mon Dec 4 2017/

...STORM WARNING IN EFFECT FROM LATE THIS EVENING THROUGH TUESDAY
MORNING...

.EARLY THIS MORNING...East winds 15 to 25 knots. Areas of fog.
Numerous rain showers. Waves 2 to 4 feet.
.TODAY...East winds 10 to 20 knots. Areas of fog. Rain showers
and isolated thunderstorms. Waves subsiding to 1 to 3 feet.
.TONIGHT...South winds 20 to 30 knots becoming west gales to
45 knots by midnight, then increasing to storm force winds to
55 knots late. Areas of fog in the evening. Numerous rain
showers. Numerous snow showers after midnight. Waves building to
10 to 14 feet occasionally to 18 feet.
.TUESDAY...West storm force winds to 50 knots diminishing to
gales to 45 knots by afternoon. Freezing spray. A chance of snow
showers. Waves subsiding to 9 to 12 feet occasionally to 15 feet.
.TUESDAY NIGHT...West gales to 40 knots becoming northwest gales
to 35 knots after midnight. Freezing spray. A chance of snow
showers. Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY...Northwest winds 20 to 30 knots. Freezing spray in
the morning. A chance of snow showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots increasing to 15 to
25 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.FRIDAY...North winds 15 to 25 knots. A chance of snow showers.
Waves building to 2 to 4 feet, then subsiding to 1 to 3 feet.

$$

LSZ263-041700-
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-
400 AM EST Mon Dec 4 2017

...STORM WARNING IN EFFECT FROM LATE THIS EVENING THROUGH TUESDAY
EVENING...

.EARLY THIS MORNING...East winds 15 to 25 knots. Widespread fog.
Numerous rain showers. Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...East winds 20 to 30 knots becoming southeast 10 to
20 knots. Widespread fog. Numerous rain showers and isolated
thunderstorms. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...South winds 15 to 25 knots becoming southwest gales to
40 knots by midnight, then becoming west storm force winds to
55 knots late. Widespread fog in the evening. Numerous rain
showers. Numerous snow showers after midnight. Waves building to
15 to 20 feet occasionally to 25 feet.
.TUESDAY...West storm force winds to 55 knots diminishing to
gales to 45 knots. Freezing spray. A chance of snow showers in
the morning. Snow showers in the afternoon. Waves building to 17
to 22 feet occasionally to 28 feet, then subsiding to 12 to 17
feet occasionally to 21 feet.
.TUESDAY NIGHT...West gales to 45 knots becoming northwest gales
to 35 knots after midnight. Freezing spray. Snow showers likely
in the evening. A chance of snow showers after midnight. Waves
subsiding to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots in the afternoon. Freezing spray in the morning. Snow
showers likely in the morning, then a chance of snow showers in
the afternoon. Waves subsiding to 4 to 7 feet occasionally to
9 feet.
.WEDNESDAY NIGHT...Northwest winds 20 to 30 knots diminishing to
15 to 25 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.THURSDAY...Northwest winds 10 to 20 knots. A chance of snow
showers. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.FRIDAY...North winds 15 to 25 knots. Snow showers likely, then a
chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.

$$

LSZ264-041700-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
400 AM EST Mon Dec 4 2017

...STORM WARNING IN EFFECT FROM LATE THIS EVENING THROUGH TUESDAY
EVENING...

.EARLY THIS MORNING...Southeast winds 20 to 30 knots. Widespread
fog. Rain showers. Waves 3 to 6 feet occasionally to 8 feet
building to 4 to 7 feet occasionally to 9 feet.
.TODAY...Southeast winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Widespread fog. Numerous rain showers
and isolated thunderstorms. Waves building to 5 to 9 feet
occasionally to 11 feet.
.TONIGHT...South winds 20 to 30 knots increasing to gales to
35 knots by midnight, then becoming southwest storm force winds
to 55 knots late. Scattered rain showers and a slight chance of
thunderstorms in the evening, then numerous rain showers, possibly
mixed with snow after midnight. Waves building to 15 to 20 feet
occasionally to 25 feet.
.TUESDAY...West storm force winds to 60 knots diminishing to
gales to 45 knots by mid afternoon. Snow showers. Freezing spray
in the afternoon. Waves building to 17 to 22 feet occasionally to
28 feet, then subsiding to 15 to 20 feet occasionally to 25 feet.
.TUESDAY NIGHT...West gales to 45 knots becoming northwest gales
to 35 knots after midnight. Freezing spray. Snow showers likely.
Waves subsiding to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY...Northwest gales to 35 knots diminishing to 20 to
30 knots in the afternoon. Freezing spray. Snow showers likely.
Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots diminishing to
20 to 30 knots after midnight. Freezing spray. Snow showers
likely in the evening. A chance of snow showers after midnight.
Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...Northwest winds 10 to 20 knots. A chance of snow
showers. Waves subsiding to calm to 2 feet.
.FRIDAY...North winds 20 to 30 knots. Snow showers likely, then a
chance of snow showers. Waves building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ265-041700-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
400 AM EST Mon Dec 4 2017

...STORM WARNING IN EFFECT FROM LATE THIS EVENING THROUGH TUESDAY
EVENING...

.EARLY THIS MORNING...Southeast winds 20 to 30 knots. Areas of
fog. Rain showers and isolated thunderstorms. Waves 3 to 6 feet
occasionally to 8 feet.
.TODAY...Southeast winds 20 to 30 knots diminishing to 15 to
25 knots by late morning, then veering south by mid afternoon.
Widespread fog. Rain showers and isolated thunderstorms. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 6 feet occasionally to 8 feet.
.TONIGHT...Southeast winds 20 to 30 knots becoming south gales to
35 knots by midnight, then becoming west storm force winds to
55 knots late. Widespread fog in the evening. A slight chance of
thunderstorms in the evening. Scattered rain showers. Scattered
snow showers after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 6 feet occasionally
to 8 feet.
.TUESDAY...West storm force winds to 55 knots diminishing to
gales to 45 knots. A chance of snow showers in the morning, then
snow showers likely in the afternoon. Waves subsiding to 9 to
12 feet occasionally to 15 feet.
.TUESDAY NIGHT...West gales to 45 knots. Freezing spray. Snow
showers likely. Waves subsiding to 7 to 10 feet occasionally to
13 feet.
.WEDNESDAY...Northwest gales to 35 knots. Freezing spray in the
morning. Snow showers. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY NIGHT...Northwest winds 20 to 30 knots. Snow showers
likely. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...Northwest winds 15 to 25 knots backing west. A chance
of snow showers. Waves subsiding to calm to 2 feet.
.FRIDAY...North winds 20 to 30 knots. Snow showers likely. Waves
building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ266-041700-
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-
400 AM EST Mon Dec 4 2017

...GALE WARNING IN EFFECT THROUGH TUESDAY MORNING...
...STORM WARNING IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
EVENING...

.EARLY THIS MORNING...Southeast gales to 35 knots. Patchy fog.
Rain showers. Waves 3 to 6 feet occasionally to 8 feet building
to 4 to 7 feet occasionally to 9 feet.
.TODAY...Southeast gales to 35 knots veering south. Widespread
fog. Rain showers and isolated thunderstorms. Waves building to
6 to 10 feet occasionally to 13 feet.
.TONIGHT...South winds 20 to 30 knots increasing to gales to
40 knots by midnight, then becoming southwest storm force winds
to 55 knots late. Widespread fog in the evening. Patchy fog after
midnight. A slight chance of thunderstorms in the evening.
Scattered rain showers. Isolated snow showers after midnight.
Waves subsiding to 5 to 8 feet occasionally to 10 feet, then
building to 12 to 17 feet occasionally to 21 feet.
.TUESDAY...West storm force winds to 55 knots diminishing to
gales to 45 knots by mid afternoon. A chance of rain showers in
the morning. A chance of snow showers. Waves building to 20 to
25 feet occasionally to 31 feet, then subsiding to 15 to 20 feet
occasionally to 25 feet.
.TUESDAY NIGHT...West gales to 45 knots. Freezing spray. Snow
showers. Waves subsiding to 10 to 14 feet occasionally to
18 feet.
.WEDNESDAY...Northwest gales to 35 knots. Freezing spray. Snow
showers. Waves subsiding to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY NIGHT...Northwest gales to 35 knots diminishing to
20 to 30 knots after midnight. Snow showers likely. Freezing
spray after midnight. Waves subsiding to 5 to 8 feet occasionally
to 10 feet.
.THURSDAY...Northwest winds 15 to 25 knots backing west. Freezing
spray. A chance of snow showers, then snow showers likely. Waves
subsiding to 1 to 3 feet.
.FRIDAY...North winds 20 to 30 knots. Snow showers likely.
Freezing spray. Waves building to 4 to 7 feet occasionally to
9 feet.

$$

LSZ267-041700-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
400 AM EST Mon Dec 4 2017

...GALE WARNING IN EFFECT THROUGH TUESDAY MORNING...
...STORM WARNING IN EFFECT FROM TUESDAY MORNING THROUGH TUESDAY
EVENING...

.EARLY THIS MORNING...Southeast gales to 35 knots. Patchy fog.
Numerous rain showers. Waves 3 to 6 feet occasionally to 8 feet
building to 4 to 7 feet occasionally to 9 feet.
.TODAY...Southeast gales to 40 knots. Widespread fog. Rain
showers. Waves building to 6 to 10 feet occasionally to 13 feet.
.TONIGHT...South gales to 35 knots becoming southwest gales to
45 knots late. Widespread fog in the evening, then patchy fog
after midnight. Numerous rain showers and a slight chance of
thunderstorms in the evening, then scattered rain showers after
midnight. Waves subsiding to 4 to 7 feet occasionally to 9 feet,
then building to 10 to 14 feet occasionally to 18 feet.
.TUESDAY...Southwest storm force winds to 50 knots. A slight
chance of rain showers in the morning. A chance of snow showers.
Waves building to 15 to 20 feet occasionally to 25 feet, then
subsiding to 12 to 17 feet occasionally to 21 feet.
.TUESDAY NIGHT...Southwest gales to 40 knots veering west after
midnight. Snow showers. Waves subsiding to 11 to 15 feet
occasionally to 19 feet.
.WEDNESDAY...West gales to 40 knots becoming northwest gales to
35 knots in the afternoon. Snow showers. Waves subsiding to 9 to
12 feet occasionally to 15 feet.
.WEDNESDAY NIGHT...Northwest winds 20 to 30 knots. Snow showers.
Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.THURSDAY...Northwest winds 15 to 25 knots backing west. A chance
of snow showers, then snow showers likely. Waves subsiding to
2 to 4 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming north 15 to
25 knots. A chance of snow showers, then snow showers likely.
Waves subsiding to calm to 2 feet, then building to 3 to 6 feet
occasionally to 8 feet.

$$

LSZ261-041700-
MAFOR 0410/
Superior West...Storm Warning in effect...13226 11216 11326 11436
11656 11677. Patchy fog through mid morning. Patchy fog after
midnight tonight. Waves 2 to 4 feet subsiding to 1 to 3 feet
today. Waves building to 10 to 13 feet tonight.

Superior North Central...Storm Warning in effect...13346 11336
11346 11343 11443 11576. Patchy fog overnight. Scattered rain
showers tonight. Waves 3 to 6 feet building to 5 to 9 feet today.
Waves building to 8 to 11 feet tonight.

Superior South Central...Storm Warning in effect...13346 12446
11343 11443 11570. Patchy fog early this morning. Patchy fog
overnight. Scattered rain showers tonight. Waves 3 to 6 feet
today building to 5 to 8 feet tonight.

Superior East...Gale Warning in effect...14356 11356 11446 11453
11460. Patchy fog early this morning. Patchy fog late. Scattered
showers from late evening on tonight. Waves 4 to 6 feet building
to 6 to 10 feet today. Waves building to 7 to 10 feet tonight.


$$

JLB

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.