Great Lakes Forecast
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FZUS63 KMQT 041450
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
950 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 northern Iowa will
deepen to 28.9 inches over western Lake Superior this evening and
28.7 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.

LSZ162-042300-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
950 AM EST Mon Dec 4 2017 /850 AM CST Mon Dec 4 2017/

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

.REST OF TODAY...East winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Areas of fog. Rain showers and
isolated thunderstorms. Waves 2 to 4 feet 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.

$$

LSZ263-042300-
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-
950 AM EST Mon Dec 4 2017

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

.REST OF TODAY...Southeast winds 5 to 15 knots increasing to
10 to 20 knots. Widespread fog. Numerous rain showers and
isolated thunderstorms. Waves 4 to 7 feet occasionally to 9 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.

$$

LSZ264-042300-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
950 AM EST Mon Dec 4 2017

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

.REST OF TODAY...Southeast winds 10 to 20 knots increasing to
20 to 30 knots by late morning, then diminishing to 15 to
25 knots by mid afternoon. Widespread fog. Numerous rain showers
and isolated thunderstorms. Waves 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.

$$

LSZ265-042300-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
950 AM EST Mon Dec 4 2017

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

.REST OF 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 4 to 7 feet occasionally to 9 feet 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.

$$

LSZ266-042300-
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-
950 AM EST Mon Dec 4 2017

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

.REST OF TODAY...Southeast gales to 40 knots becoming south gales
to 35 knots. Widespread fog. Rain showers and isolated
thunderstorms. Waves 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.

$$

LSZ267-042300-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
950 AM EST Mon Dec 4 2017

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

.REST OF TODAY...Southeast gales to 40 knots. Widespread fog.
Rain showers. Waves 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.

$$
LSZ261-042300-
MAFOR 0416/
Superior West...Storm Warning in effect...12216 11326 11436 11656
11677 11671 11670. Patchy fog after midnight tonight. Freezing
spray. Scattered snow showers through mid morning, then chance of
snow showers late Tuesday morning. Waves 1 to 4 feet building to
11 to 15 feet tonight. Waves 12 to 16 feet Tuesday morning.

Superior North Central...Storm Warning in effect...11346 11336
11346 11343 11443 11576 11670 11677. Patchy fog overnight.
Scattered rain showers tonight. Chance of snow showers and
scattered rain showers through mid morning Tuesday. Waves 5 to 9
feet this afternoon. Waves 5 to 8 feet building to 11 to 15 feet
tonight. Waves 17 to 22 feet Tuesday morning.

Superior South Central...Storm Warning in effect...11346 12446
11343 11443 11570 12670. Patchy fog overnight. Scattered rain
showers tonight. Chance of snow showers late Tuesday morning.
Waves 3 to 6 feet building to 8 to 11 feet tonight. Waves 10 to
14 feet Tuesday morning.

Superior East...Storm Warning in effect...13356 11446 11453 11460
12570. Patchy fog late. Scattered showers from late evening on
tonight. Chance of rain and snow showers through mid morning
Tuesday, then chance of snow showers. Waves 7 to 10 feet this
afternoon. Waves 5 to 9 feet building to 8 to 11 feet tonight.
Waves 14 to 18 feet building to 15 to 20 feet Tuesday morning.

$$

Petro

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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