Great Lakes Forecast
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762
FZUS63 KMQT 151928
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
328 PM EDT Sun Apr 15 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 northern Ohio this afternoon will
deepen to 29.4 inches and reach 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, building to 30.5 inches over Lake
Superior on Friday.

LSZ162-160330-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
328 PM EDT Sun Apr 15 2018 /228 PM CDT Sun Apr 15 2018/

...GALE WARNING IN EFFECT THROUGH MONDAY AFTERNOON...

.LATE THIS AFTERNOON...Northeast gales to 40 knots. Freezing
spray. Snow. Waves 15 to 20 feet occasionally to 25 feet.
.TONIGHT...Northeast gales to 40 knots. Snow through midnight,
then a chance of snow after midnight. Freezing spray after
midnight. Waves subsiding to 10 to 14 feet occasionally to
18 feet.
.MONDAY...North winds 20 to 30 knots. Occasional gale force gusts
to 35 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 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of snow showers. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...North winds 10 to 20 knots becoming northeast 5 to
15 knots by mid afternoon. A slight chance of snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots backing northeast after
midnight. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. Waves building to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...Northeast winds 10 to 20 knots. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.THURSDAY...Northeast winds 5 to 15 knots becoming west less than
10 knots. Waves subsiding to 2 to 4 feet.
.FRIDAY...East winds less than 10 knots veering south. Waves 2 to
4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-160330-
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-
328 PM EDT Sun Apr 15 2018

...GALE WARNING IN EFFECT THROUGH MONDAY AFTERNOON...

.LATE THIS AFTERNOON...Northeast gales to 45 knots. Freezing
spray. Snow. Waves 15 to 20 feet occasionally to 25 feet.
.TONIGHT...Northeast gales to 40 knots. Freezing spray. Snow.
Waves subsiding to 10 to 14 feet occasionally to 18 feet.
.MONDAY...North gales to 35 knots diminishing to 20 to 30 knots
in the afternoon. Freezing spray. A chance of snow through early
afternoon. Snow likely by mid afternoon. Waves subsiding to 6 to
9 feet occasionally to 11 feet.
.MONDAY NIGHT...North winds 20 to 30 knots. A chance of snow
showers. Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of snow showers. A slight
chance of rain showers by mid afternoon. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.TUESDAY NIGHT...Northeast winds 5 to 15 knots. Waves subsiding
to 2 to 4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. Waves
3 to 6 feet occasionally to 8 feet.
.THURSDAY...Northeast winds 10 to 20 knots becoming north 5 to
15 knots. Waves subsiding to 1 to 3 feet.
.FRIDAY...Northeast winds 5 to 15 knots becoming south less than
10 knots. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-160330-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
328 PM EDT Sun Apr 15 2018

...GALE WARNING IN EFFECT THROUGH MONDAY AFTERNOON...

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

Note, wave height forecasts are for ice free areas.

$$

LSZ265-160330-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
328 PM EDT Sun Apr 15 2018

...GALE WARNING IN EFFECT THROUGH MONDAY AFTERNOON...

.LATE THIS AFTERNOON...Northeast gales to 40 knots. Freezing
spray. Snow. Waves 12 to 17 feet occasionally to 21 feet.
.TONIGHT...Northeast gales to 40 knots. Freezing spray through
midnight. Snow. Waves subsiding to 8 to 11 feet occasionally to
14 feet.
.MONDAY...North gales to 35 knots diminishing to 20 to 30 knots
in the afternoon. Freezing spray. Snow likely. Waves subsiding to
7 to 10 feet occasionally to 13 feet, then building to 8 to
11 feet occasionally to 14 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 5 to 8 feet occasionally to 10 feet.
.TUESDAY...North winds 15 to 25 knots. 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. Waves subsiding to 1 to 3 feet, then building to
2 to 4 feet.
.WEDNESDAY...East winds 10 to 20 knots backing northeast by mid
afternoon. Waves 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. Waves building
to 4 to 7 feet occasionally to 9 feet.
.THURSDAY...North winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.FRIDAY...Northeast winds 5 to 15 knots veering south. Waves
subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-160330-
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-
328 PM EDT Sun Apr 15 2018

...GALE WARNING IN EFFECT THROUGH MONDAY AFTERNOON...

.LATE THIS AFTERNOON...Northeast gales to 40 knots. Freezing
spray. Snow. Waves 12 to 17 feet occasionally to 21 feet.
.TONIGHT...Northeast gales to 40 knots. Freezing spray. Snow,
possibly mixed with freezing rain. Waves subsiding to 8 to
11 feet occasionally to 14 feet.
.MONDAY...Northeast gales to 35 knots backing north in the
afternoon. Freezing spray. Snow. Waves subsiding to 7 to 10 feet
occasionally to 13 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 6 to 9 feet occasionally to 11 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots by mid afternoon. A slight chance of snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. Waves 2 to 4 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.THURSDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 2 to 4 feet.
.FRIDAY...North winds 5 to 15 knots backing northwest. Waves
subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-160330-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
328 PM EDT Sun Apr 15 2018

...GALE WARNING IN EFFECT THROUGH MONDAY AFTERNOON...

.LATE THIS AFTERNOON...Northeast gales to 40 knots. Freezing
spray. Snow. Waves 9 to 12 feet occasionally to 15 feet.
.TONIGHT...Northeast gales to 40 knots diminishing to 35 knots
late. Freezing spray through midnight. Snow, possibly mixed with
freezing rain. Waves subsiding to 6 to 9 feet occasionally to 11
feet.
.MONDAY...Northeast gales to 35 knots backing north in the
afternoon, then diminishing to 15 to 25 knots late. Snow. Waves
subsiding to 4 to 7 feet occasionally to 9 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, then
building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots 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. Waves subsiding to
1 to 3 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. Waves 1 to 3 feet.
.WEDNESDAY NIGHT...Northeast winds 15 to 25 knots. 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 2 to 4 feet.
.FRIDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-160330-
MAFOR 1521/
Superior West...Gale Warning in effect...12167 12157 11151 11851
11841 11840. Freezing spray. A chance of snow Monday. Waves 13 to
18 feet subsiding to 11 to 16 feet tonight. Waves 10 to 13 feet
subsiding to 5 to 9 feet Monday.

Superior North Central...Gale Warning in effect...15157 12857.
Freezing spray. Waves 10 to 15 feet tonight. Waves 8 to 12 feet
Monday.

Superior South Central...Gale Warning in effect...14157 12147
12847. Freezing spray. Waves 11 to 16 feet subsiding to 10 to 13
feet tonight. Waves 9 to 12 feet subsiding to 7 to 10 feet Monday.

Superior East...Gale Warning in effect...11167 14157 12147 11847.
Freezing spray this evening. A chance of freezing rain overnight.
Waves 10 to 13 feet subsiding to 7 to 11 feet tonight. Waves 6 to
10 feet subsiding to 5 to 8 feet Monday.

$$

07

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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