Great Lakes Forecast
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000
FZUS63 KMQT 141406
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1006 AM EDT Sat Apr 14 2018

For waters beyond 5 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 29.5 inch low over southern Iowa will slowly lift
across the central Great Lakes region through the rest of the
weekend, reaching the lower Great Lakes by late Monday night.
A brief ridge of 30.0 inches will then move over the region
Wednesday morning after which another low of 29.5 inches will move
out of the Rockies into the central Plains, passing through the
Great Lakes on Wednesday.

LSZ162-142215-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1006 AM EDT Sat Apr 14 2018 /906 AM CDT Sat Apr 14 2018/

...GALE WARNING IN EFFECT THROUGH LATE SUNDAY NIGHT...

.REST OF TODAY...Northeast gales to 45 knots. A few storm force
gusts to 50 knots. Freezing spray. Waves 12 to 17 feet
occasionally to 21 feet subsiding to 12 to 17 feet occasionally to
21 feet.
.TONIGHT...Northeast gales to 45 knots. A few storm force gusts to
50 knots. A chance of snow. Freezing spray after midnight. Waves
12 to 17 feet occasionally to 21 feet.
.SUNDAY...Northeast gales to 40 knots. Freezing spray through
early afternoon. Snow likely. Waves building to 15 to 20 feet
occasionally to 25 feet.
.SUNDAY NIGHT...Northeast gales to 40 knots becoming north 20 to
30 knots after midnight. Snow likely through midnight, then a
chance of snow after midnight. Freezing spray after midnight.
Waves subsiding to 7 to 10 feet occasionally to 13 feet.
.MONDAY...North winds 10 to 20 knots. Freezing spray through
early afternoon. A chance of snow. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.MONDAY NIGHT...North winds 10 to 20 knots. A chance of snow.
Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 10 to 20 knots veering east. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots. A chance of snow, possibly mixed with rain. Waves
building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ263-142215-
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-
1006 AM EDT Sat Apr 14 2018

...GALE WARNING IN EFFECT THROUGH LATE SUNDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 4 PM EDT THIS
AFTERNOON...

.REST OF TODAY...East gales to 45 knots becoming northeast gales
to 40 knots late. Freezing spray. Waves 12 to 17 feet
occasionally to 21 feet subsiding to 11 to 15 feet occasionally
to 19 feet.
.TONIGHT...East gales to 40 knots. A chance of snow. Freezing
spray after midnight. Waves building to 12 to 17 feet
occasionally to 21 feet, then subsiding to 11 to 15 feet
occasionally to 19 feet.
.SUNDAY...Northeast gales to 40 knots. Freezing spray. Snow.
Waves building to 15 to 20 feet occasionally to 25 feet.
.SUNDAY NIGHT...Northeast gales to 40 knots diminishing to 20 to
30 knots after midnight. Freezing spray. Snow likely. Waves
subsiding to 8 to 11 feet occasionally to 14 feet.
.MONDAY...North winds 15 to 25 knots. Freezing spray through
early afternoon. Snow likely through early afternoon, then a
chance of snow by mid afternoon. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...North winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A chance of snow. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.TUESDAY...North winds 10 to 20 knots veering northeast. A chance
of snow. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots becoming north 10 to
20 knots. A chance of snow, possibly mixed with rain. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
2 to 4 feet.

$$

LSZ264-142215-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1006 AM EDT Sat Apr 14 2018

...GALE WARNING IN EFFECT THROUGH LATE SUNDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 4 PM EDT THIS
AFTERNOON...

.REST OF TODAY...East gales to 40 knots. Heavy freezing spray.
Waves 9 to 12 feet occasionally to 15 feet subsiding to 8 to
11 feet occasionally to 14 feet.
.TONIGHT...East gales to 45 knots. Freezing spray after midnight.
A chance of snow after midnight. Waves building to 10 to 14 feet
occasionally to 18 feet.
.SUNDAY...Northeast gales to 45 knots. Heavy freezing spray. Snow
likely through early afternoon. Snow by mid afternoon. Waves
building to 12 to 17 feet occasionally to 21 feet.
.SUNDAY NIGHT...Northeast gales to 40 knots. Freezing spray.
Snow. Waves subsiding to 7 to 10 feet occasionally to 13 feet.
.MONDAY...North winds 20 to 30 knots. Freezing spray. Snow likely
through early afternoon. A chance of snow by mid afternoon. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...North winds 20 to 30 knots. A chance of snow.
Freezing spray after midnight. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY...North winds 10 to 20 knots. A chance of snow. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots backing north. A
chance of snow, possibly mixed with rain. Waves building to 3 to
5 feet occasionally to 7 feet.

$$

LSZ265-142215-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1006 AM EDT Sat Apr 14 2018

...GALE WARNING IN EFFECT THROUGH LATE SUNDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 4 PM EDT THIS
AFTERNOON...

.REST OF TODAY...East gales to 40 knots. Freezing spray. Waves
10 to 14 feet occasionally to 18 feet subsiding to 9 to 12 feet
occasionally to 15 feet.
.TONIGHT...East gales to 45 knots. Freezing spray after midnight.
A chance of snow after midnight. Waves building to 11 to 15 feet
occasionally to 19 feet, then subsiding to 10 to 14 feet
occasionally to 18 feet.
.SUNDAY...East gales to 40 knots becoming northeast gales to
45 knots in the afternoon. Heavy freezing spray. Snow. Waves
building to 12 to 17 feet occasionally to 21 feet.
.SUNDAY NIGHT...Northeast gales to 35 knots diminishing to 20 to
30 knots after midnight. Freezing spray through midnight. Snow
likely. Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.MONDAY...North winds 20 to 30 knots. Freezing spray through
early afternoon. Snow likely. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.MONDAY NIGHT...Northwest winds 20 to 30 knots. A chance of snow.
Freezing spray after midnight. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...Northwest winds 10 to 20 knots veering north. A chance
of snow. Waves subsiding to calm to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots becoming north 15 to
25 knots. A chance of snow, possibly mixed with rain. Waves
building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ266-142215-
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-
1006 AM EDT Sat Apr 14 2018

...GALE WARNING IN EFFECT THROUGH LATE SUNDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 4 PM EDT THIS
AFTERNOON...

.REST OF TODAY...East gales to 45 knots becoming northeast gales
to 40 knots late. Heavy freezing spray. Waves 10 to 14 feet
occasionally to 18 feet subsiding to 9 to 12 feet occasionally to
15 feet.
.TONIGHT...East gales to 45 knots. Freezing spray after midnight.
A slight chance of snow after midnight. Waves building to 11 to
15 feet occasionally to 19 feet, then subsiding to 10 to 14 feet
occasionally to 18 feet.
.SUNDAY...East gales to 40 knots becoming northeast gales to
45 knots in the afternoon. Freezing spray. Snow. Waves building
to 12 to 17 feet occasionally to 21 feet.
.SUNDAY NIGHT...Northeast gales to 40 knots diminishing to 20 to
30 knots after midnight. Freezing spray through midnight. Snow.
Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.MONDAY...North winds 20 to 30 knots. Freezing spray through
early afternoon. Snow likely through early afternoon. A chance of
snow by mid afternoon. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.MONDAY NIGHT...North winds 20 to 30 knots. Snow likely through
midnight, then a chance of snow after midnight. Freezing spray
after midnight. Waves 5 to 8 feet occasionally to 10 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. A chance of snow. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of snow, possibly mixed with rain. Waves
building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ267-142215-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1006 AM EDT Sat Apr 14 2018

...GALE WARNING IN EFFECT THROUGH LATE SUNDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 4 PM EDT THIS
AFTERNOON...

.REST OF TODAY...East gales to 45 knots becoming northeast gales
to 40 knots in the afternoon. Heavy freezing spray. Waves 7 to
10 feet occasionally to 13 feet subsiding to 5 to 8 feet
occasionally to 10 feet, then building to 6 to 9 feet
occasionally to 11 feet.
.TONIGHT...East gales to 40 knots. Freezing spray. A chance of
snow after midnight. Waves building to 8 to 11 feet occasionally
to 14 feet.
.SUNDAY...East gales to 40 knots backing northeast in the
afternoon. Freezing spray. A chance of snow through early
afternoon. Snow by mid afternoon. Waves building to 9 to 12 feet
occasionally to 15 feet.
.SUNDAY NIGHT...Northeast gales to 40 knots diminishing to 20 to
30 knots after midnight. Snow. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.MONDAY...North winds 15 to 25 knots. Snow likely. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...North winds 20 to 30 knots backing northwest
after midnight. Snow likely through midnight, then a chance of
snow after midnight. Freezing spray after midnight. Waves
building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of snow. A chance of rain. Waves subsiding to
calm to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of snow, possibly mixed with rain. Waves
building to 2 to 4 feet.

$$
LSZ261-142215-
MAFOR 1415/
Superior West...Gale Warning in effect...15261 19271 12157.
Chance of snow late tonight. Freezing spray Sunday morning. Waves
12 to 16 feet.

Superior North Central...Gale Warning and heavy freezing spray
warning in effect...11252 11251 12151 14251. Chance of snow
Sunday morning. Waves 7 to 11 feet this afternoon. Waves 8 to 12
feet building to 10 to 13 feet tonight. Waves 10 to 14 feet Sunday
morning.

Superior South Central...Gale Warning and heavy freezing spray
warning in effect...13251 14251 11257. Freezing spray Sunday
morning. Waves 9 to 12 feet this afternoon. Waves 10 to 14 feet
building to 11 to 15 feet tonight. Waves 11 to 15 feet Sunday
morning.

Superior East...Gale Warning and heavy freezing spray warning in
effect...12152 12151 12261 11251 11151. Chance of snow Sunday
morning. Waves 6 to 10 feet this afternoon. Waves 7 to 11 feet
building to 9 to 12 feet tonight. Waves 9 to 12 feet Sunday
morning.

$$

JLA

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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