Great Lakes Forecast
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FZUS63 KMQT 170313
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1013 PM EST Tue Jan 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 30.4 inch low over New England will continue to lift
northeast into the Atlantic tonight. Tonight through Wednesday
night, Lake Superior will be between a 29.6 inch low pressure over
far southern Hudson Bay and a 30.7 inch high pressure over the
Middle Mississippi Valley. A 29.8 inch trough will then drift from
northern Ontario to the Upper Great Lakes Thursday into Friday. A
29.3 inch low pressure will then develop across southern Manitoba
Friday afternoon and track eastward to central Quebec on Saturday
evening. On Sunday morning a 29.6 inch low over the southern
plains is expected to deepen to 29.5 inches over northern
Missouri on Sunday afternoon.

LSZ162-171115-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1013 PM EST Tue Jan 16 2018 /913 PM CST Tue Jan 16 2018/

...GALE WARNING IN EFFECT THROUGH LATE WEDNESDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY
MORNING...

.REST OF TONIGHT...West winds 20 to 30 knots becoming southwest
gales to 35 knots late. Heavy freezing spray after midnight.
Waves 2 to 4 feet building to 8 to 11 feet occasionally to
14 feet.
.WEDNESDAY...Southwest gales to 40 knots. Heavy freezing spray in
the morning. Waves building to 12 to 17 feet occasionally to
21 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves subsiding to 10 to 14 feet occasionally to
18 feet.
.THURSDAY...West winds 10 to 20 knots. A slight chance of snow in
the morning. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots veering northeast. Waves
calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots increasing to 20 to
30 knots. Snow likely, then a chance of snow. Patchy blowing
snow. Waves building to 6 to 9 feet occasionally to 11 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-171115-
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-
1013 PM EST Tue Jan 16 2018

...GALE WARNING IN EFFECT THROUGH LATE WEDNESDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY
MORNING...

.REST OF TONIGHT...West winds 20 to 30 knots increasing to gales
to 40 knots by midnight. Heavy freezing spray. Waves 3 to 5 feet
occasionally to 7 feet building to 10 to 14 feet occasionally to
18 feet.
.WEDNESDAY...West gales to 40 knots. Heavy freezing spray in the
morning. Waves building to 11 to 15 feet occasionally to 19 feet,
then subsiding to 10 to 14 feet occasionally to 18 feet.
.WEDNESDAY NIGHT...West gales to 35 knots diminishing to 15 to
25 knots. Waves subsiding to 8 to 11 feet occasionally to
14 feet.
.THURSDAY...West winds 10 to 20 knots. A slight chance of snow.
Waves subsiding to 2 to 4 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots. A chance of snow in the
morning. A chance of rain. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots veering west after
midnight. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SATURDAY...West winds 5 to 15 knots veering northeast. Waves
calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots increasing to 20 to
30 knots. Snow likely. Waves building to 6 to 9 feet occasionally
to 11 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-171115-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1013 PM EST Tue Jan 16 2018

...GALE WARNING IN EFFECT THROUGH LATE WEDNESDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT THROUGH WEDNESDAY
MORNING...

.REST OF TONIGHT...West winds 15 to 25 knots increasing to gales
to 40 knots by midnight. Isolated snow showers late in the
evening. Freezing spray. Waves 2 to 4 feet building to 10 to
14 feet occasionally to 18 feet.
.WEDNESDAY...West gales to 40 knots. Freezing spray in the
morning. Waves building to 15 to 20 feet occasionally to 25 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots by midnight. Waves subsiding to 12 to 17 feet
occasionally to 21 feet.
.THURSDAY...West winds 10 to 20 knots. A slight chance of snow.
Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots. A chance of snow in the
morning. A chance of rain. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots. Waves 1 to 3 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming northeast
5 to 15 knots. Waves subsiding to calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. Snow likely. Freezing spray. Waves building to 5 to
8 feet occasionally to 10 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-171115-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1013 PM EST Tue Jan 16 2018

...GALE WARNING IN EFFECT FROM 1 AM EST WEDNESDAY THROUGH
WEDNESDAY EVENING...

.REST OF TONIGHT...West winds 15 to 25 knots increasing to gales
to 35 knots. Isolated snow showers. Heavy freezing spray after
midnight. Waves 3 to 6 feet occasionally to 8 feet building to
6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...West gales to 40 knots. Heavy freezing spray in the
morning. Waves building to 9 to 12 feet occasionally to 15 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots by midnight. Waves subsiding to 8 to 11 feet
occasionally to 14 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. A slight chance of snow. Waves
subsiding to 7 to 10 feet occasionally to 13 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves subsiding to 6 to 9 feet occasionally to
11 feet.
.FRIDAY...Southwest winds 10 to 20 knots. A chance of rain in the
afternoon. Waves 6 to 9 feet occasionally to 11 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots veering west after
midnight. Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.SATURDAY...Northwest winds 10 to 20 knots veering east. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 15 to 25 knots.
Snow. Freezing spray. Waves building to 5 to 8 feet occasionally
to 10 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-171115-
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-
1013 PM EST Tue Jan 16 2018

...GALE WARNING IN EFFECT FROM 1 AM EST WEDNESDAY THROUGH
WEDNESDAY EVENING...

.REST OF TONIGHT...West winds 15 to 25 knots increasing to gales
to 40 knots by midnight. Freezing spray. Isolated snow showers.
Waves 2 to 4 feet building to 10 to 14 feet occasionally to
18 feet.
.WEDNESDAY...West gales to 40 knots. Freezing spray in the
morning. Waves building to 11 to 15 feet occasionally to 19 feet,
then subsiding to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots by midnight. A slight chance of snow after midnight.
Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.THURSDAY...West winds 10 to 20 knots. A slight chance of snow.
Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming south 15 to
25 knots in the afternoon. A chance of rain. A chance of sleet in
the afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots veering west after
midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...Northwest winds 10 to 20 knots veering east. Waves
subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 15 to 25 knots.
A chance of snow, then snow. Freezing spray. Waves building to
6 to 9 feet occasionally to 11 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-171115-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1013 PM EST Tue Jan 16 2018

...GALE WARNING IN EFFECT FROM 7 AM EST WEDNESDAY THROUGH
WEDNESDAY EVENING...

.REST OF TONIGHT...West winds 10 to 20 knots increasing to 20 to
30 knots by midnight, then backing southwest late. Scattered snow
showers. Freezing spray after midnight. Waves calm to 2 feet
building to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...Southwest gales to 35 knots veering west by late
morning, then diminishing to 20 to 30 knots by mid afternoon.
Freezing spray in the morning. Isolated snow showers in the
morning. Waves building to 10 to 14 feet occasionally to 18 feet,
then subsiding to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots. A slight chance of
snow after midnight. Waves subsiding to 4 to 7 feet occasionally
to 9 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. A chance of snow. Waves subsiding to
1 to 3 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...South winds 15 to 25 knots increasing to 20 to 30 knots
in the afternoon. A chance of snow. A chance of rain, possibly
mixed with freezing rain in the afternoon. Waves building to 2 to
4 feet.
.FRIDAY NIGHT...Southwest winds 20 to 30 knots becoming west
15 to 25 knots after midnight. A chance of rain and snow in the
evening. Waves subsiding to 1 to 3 feet.
.SATURDAY...West winds 10 to 20 knots backing southeast. Waves
subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots increasing to 15 to 25 knots.
A chance of snow, then snow. Waves building to 4 to 7 feet
occasionally to 9 feet.

Note, wave height forecasts are for ice free areas.

$$
LSZ261-171115-
MAFOR 1704/
Superior West...Gale and Heavy Freezing Spray Warnings in
effect...11642 13552 13550 11640. Freezing spray late this
evening, then heavy freezing spray overnight through Wednesday
morning. Freezing spray early Wednesday afternoon. Waves 3 to 6
feet building to 8 to 11 feet overnight. Waves 8 to 12 feet
subsiding to 7 to 10 feet Wednesday. Waves 7 to 10 feet subsiding
to 5 to 8 feet Wednesday evening.

Superior North Central...Gale and Heavy Freezing Spray Warnings
in effect...11650 13660 11662 12650 11640. Heavy freezing spray
overnight through Wednesday morning. Waves 3 to 6 feet building to
10 to 13 feet overnight. Waves 10 to 15 feet subsiding to 9 to 12
feet Wednesday. Waves 8 to 11 feet subsiding to 6 to 9 feet
Wednesday evening.

Superior South Central...Gale Warning in effect...11640 13651
12650 12640. Freezing spray overnight through early Wednesday
afternoon. Waves 3 to 5 feet building to 4 to 7 feet overnight.
Waves 5 to 9 feet subsiding to 4 to 7 feet Wednesday. Waves 3 to 6
feet Wednesday evening.

Superior East...Gale Warning in effect...11641 13650 11651 11650
11640 11630. Freezing spray after late tonight through early
Wednesday afternoon. Scattered snow showers late this evening.
Waves 3 to 5 feet building to 6 to 9 feet overnight. Waves 8 to
11 feet building to 9 to 13 feet Wednesday. Waves 6 to 10 feet
Wednesday evening.

$$

JSS

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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