Great Lakes Forecast
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FZUS63 KMQT 142002
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 PM 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 29.6 inch low over southern Iowa will slowly lift
across the central Great Lakes region through the rest of the
weekend, reaching Georgian Bay 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 late on
Wednesday. A 30.3 inch high will then move over the western Great
Lakes by late Thursday.

LSZ162-150415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 PM EDT Sat Apr 14 2018 /302 PM CDT Sat Apr 14 2018/

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

.LATE THIS AFTERNOON...Northeast gales to 45 knots. A few storm
force gusts to 50 knots. A slight chance of snow. Freezing spray.
Waves 12 to 17 feet occasionally to 21 feet.
.TONIGHT...Northeast gales to 45 knots. A few storm force gusts
to 50 knots. Freezing spray. A chance of snow through midnight.
Snow likely after midnight. Waves 12 to 17 feet occasionally to 21
feet.
.SUNDAY...Northeast gales to 45 knots. Freezing spray through
early afternoon. Snow. Waves building to 15 to 20 feet
occasionally to 25 feet.
.SUNDAY NIGHT...Northeast gales to 40 knots becoming north gales
to 35 knots late. Freezing spray. Snow through midnight. A chance
of snow after midnight. Waves subsiding to 9 to 12 feet
occasionally to 15 feet.
.MONDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots by mid 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
showers. Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...North winds 10 to 20 knots becoming east 5 to 15 knots
by mid afternoon. Waves subsiding to 3 to 6 feet occasionally to
8 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. A chance of snow
showers, possibly mixed with rain. Waves building to 3 to 6 feet
occasionally to 8 feet.
.THURSDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-150415-
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-
402 PM 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...

.LATE THIS AFTERNOON...Northeast gales to 40 knots. A slight
chance of snow. Heavy freezing spray. Waves 11 to 15 feet
occasionally to 19 feet.
.TONIGHT...Northeast gales to 40 knots veering east after
midnight. Freezing spray. A chance of snow. 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 45 knots. Freezing spray. Snow.
Waves building to 15 to 20 feet occasionally to 25 feet.
.SUNDAY NIGHT...Northeast gales to 40 knots. Freezing spray. Snow
through midnight. Snow likely after midnight. Waves subsiding to
9 to 12 feet occasionally to 15 feet.
.MONDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. Freezing spray through early
afternoon. A chance of snow. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.MONDAY NIGHT...North winds 15 to 25 knots. A chance of snow
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. A chance of snow showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots increasing to
10 to 20 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. A chance of snow
showers, possibly mixed with rain. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.THURSDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-150415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
402 PM 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...

.LATE THIS AFTERNOON...Northeast gales to 40 knots. Waves 8 to
11 feet occasionally to 14 feet.
.TONIGHT...East gales to 45 knots. Freezing spray. A chance of
snow. Waves building to 10 to 14 feet occasionally to 18 feet.
.SUNDAY...Northeast gales to 45 knots. Freezing spray. Snow.
Waves building to 12 to 17 feet occasionally to 21 feet.
.SUNDAY NIGHT...Northeast gales to 45 knots. Freezing spray. Snow
through midnight. Snow likely after midnight. Waves subsiding to
9 to 12 feet occasionally to 15 feet.
.MONDAY...North gales to 35 knots diminishing to 20 to 30 knots
by mid afternoon. Freezing spray through early afternoon. Snow
likely. Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. A chance of snow showers. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots. A chance of snow showers, possibly mixed with rain.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-150415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 PM 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...

.LATE THIS AFTERNOON...East gales to 40 knots. Heavy freezing
spray. Waves 9 to 12 feet occasionally to 15 feet building to 10
to 14 feet occasionally to 18 feet.
.TONIGHT...East gales to 45 knots. Freezing spray. A chance of
snow through midnight. Snow likely after midnight. Waves building
to 11 to 15 feet occasionally to 19 feet.
.SUNDAY...East gales to 45 knots backing northeast 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 late. Freezing spray. Snow through midnight. Snow likely
after midnight. Waves subsiding to 7 to 10 feet occasionally to
13 feet.
.MONDAY...North winds 20 to 30 knots backing northwest by mid
afternoon. Snow likely. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.MONDAY NIGHT...North winds 20 to 30 knots. Snow showers likely
through midnight, then a chance of snow showers after midnight.
Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 15 to 25 knots backing northwest by mid
afternoon. A chance of snow showers. Waves subsiding to 2 to
4 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. A chance of snow showers. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots increasing to 20 to
30 knots. A chance of snow showers, possibly mixed with rain.
Waves building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of snow showers. Waves subsiding to calm to
2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-150415-
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-
402 PM 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...

.LATE THIS AFTERNOON...Northeast gales to 40 knots. Heavy freezing
spray. Waves 10 to 14 feet occasionally to 18 feet.
.TONIGHT...East gales to 45 knots. Freezing spray. A chance of
snow. Waves building to 11 to 15 feet occasionally to 19 feet.
.SUNDAY...East gales to 45 knots backing northeast in the
afternoon. Freezing spray. Snow. Waves building to 12 to 17 feet
occasionally to 21 feet.
.SUNDAY NIGHT...Northeast gales to 40 knots. Freezing spray. Snow
through midnight. Snow likely after midnight. Waves subsiding to
7 to 10 feet occasionally to 13 feet.
.MONDAY...North winds 20 to 30 knots. A slight chance of freezing
rain through early afternoon. Snow likely. Waves subsiding to
5 to 8 feet occasionally to 10 feet.
.MONDAY NIGHT...North winds 20 to 30 knots. Snow showers likely
through midnight, then a chance of snow showers after midnight.
Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...North winds 15 to 25 knots backing northwest by mid
afternoon. A chance of snow showers. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. A chance of snow showers. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots increasing to 20 to
30 knots. A chance of snow showers, possibly mixed with rain.
Waves building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-150415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
402 PM 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...

.LATE THIS AFTERNOON...Northeast gales to 35 knots. Heavy freezing
spray. Waves 6 to 10 feet occasionally to 13 feet, then building
to 7 to 10 feet occasionally to 13 feet.
.TONIGHT...Northeast gales to 40 knots veering east after
midnight. Freezing spray. A chance of snow. Waves building to
8 to 11 feet occasionally to 14 feet.
.SUNDAY...East gales to 35 knots becoming northeast gales to
40 knots in the afternoon. Freezing spray. Snow. Waves building
to 10 to 14 feet occasionally to 18 feet.
.SUNDAY NIGHT...Northeast gales to 40 knots diminishing to 20 to
30 knots late. Freezing spray. Snow. Waves subsiding to 5 to
8 feet occasionally to 10 feet.
.MONDAY...Northeast winds 15 to 25 knots backing north by mid
afternoon. Snow likely, possibly mixed with freezing rain. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.MONDAY NIGHT...North winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. Snow showers likely through midnight,
then a chance of snow showers after midnight. Waves building to
3 to 6 feet occasionally to 8 feet.
.TUESDAY...North winds 15 to 25 knots backing northwest by mid
afternoon. A chance of snow showers. Waves building to 3 to
6 feet occasionally to 8 feet, then subsiding to 2 to 4 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. A chance of snow showers. Waves subsiding to 1 to
3 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of snow showers, possibly mixed with rain.
Waves building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...North winds 15 to 25 knots becoming northeast 10 to
20 knots. A chance of snow showers. Waves subsiding to 1 to
3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-150415-
MAFOR 1421/
Superior West...Gale Warning in effect...12160 19170 12151 14167.
Freezing spray overnight and Sunday morning. Chance of snow
tonight. Waves 12 to 16 feet tonight. Waves 12 to 17 feet
building to 14 to 18 feet Sunday.

Superior North Central...Gale Warning in effect...11150 11151
13251 12157 11167. Chance of snow through mid morning Sunday.
Freezing spray Sunday. Waves 7 to 11 feet building to 10 to 14
feet tonight. Waves 11 to 16 feet Sunday.

Superior South Central...Gale Warning in effect...11150 11151
12251 12257 12157. Chance of snow tonight. Freezing spray Sunday.
Waves 10 to 14 feet building to 11 to 15 feet tonight. Waves 11
to 16 feet building to 13 to 17 feet Sunday.

Superior East...Gale Warning in effect...11150 11151 13251 11257
12167. Chance of snow from late evening on tonight. Freezing
spray Sunday. Waves 7 to 11 feet building to 9 to 12 feet tonight.
Waves 10 to 14 feet Sunday.

$$

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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