Great Lakes Forecast
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588
FZUS63 KMQT 160156
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
956 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 the Ohio Valley 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.

LSZ162-161000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
956 PM EDT Sun Apr 15 2018 /856 PM CDT Sun Apr 15 2018/

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

.REST OF TONIGHT...Northeast gales to 40 knots. Snow through late
evening, then a chance of snow after midnight. Freezing spray
after midnight. Waves 15 to 20 feet occasionally to 25 feet
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.

$$

LSZ263-161000-
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-
956 PM EDT Sun Apr 15 2018

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

.REST OF TONIGHT...Northeast gales to 40 knots. Snow. Freezing
spray after midnight. Waves 12 to 17 feet occasionally to 21 feet
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.

$$

LSZ264-161000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
956 PM EDT Sun Apr 15 2018

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

.REST OF TONIGHT...Northeast gales to 45 knots. Freezing spray.
Snow. Waves 11 to 15 feet occasionally to 19 feet 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.

$$

LSZ265-161000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
956 PM EDT Sun Apr 15 2018

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

.REST OF TONIGHT...Northeast gales to 40 knots. Freezing spray.
Snow. Waves 12 to 17 feet occasionally to 21 feet 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.

$$

LSZ266-161000-
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-
956 PM EDT Sun Apr 15 2018

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

.REST OF TONIGHT...Northeast gales to 40 knots. Freezing spray.
Snow, possibly mixed with freezing rain. Waves 11 to 15 feet
occasionally to 19 feet 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.

$$

LSZ267-161000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
956 PM EDT Sun Apr 15 2018

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

.REST OF TONIGHT...Northeast gales to 35 knots diminishing to
20 to 30 knots late. Snow, possibly mixed with freezing rain.
Waves 8 to 11 feet occasionally to 14 feet 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.

$$
LSZ261-161000-
MAFOR 1603/
Superior West...Gale Warning in effect...12157 11151 11851 11841
13840. Freezing spray. Chance of snow Monday. Waves 11 to 16 feet
overnight. Waves 9 to 13 feet subsiding to 5 to 9 feet Monday.
Waves 4 to 7 feet Monday evening.


Superior North Central...Gale Warning in effect...14157 12857
12847. Freezing spray. Waves 10 to 15 feet overnight. Waves 8 to
12 feet Monday. Waves 7 to 10 feet Monday evening.

Superior South Central...Gale Warning in effect...12157 12147
14847. Freezing spray. Waves 10 to 15 feet overnight. Waves 9 to
12 feet subsiding to 7 to 10 feet Monday. Waves 8 to 11 feet
Monday evening.

Superior East...Gale Warning in effect...13157 12147 11847 12837.
Freezing spray. Waves 8 to 12 feet subsiding to 7 to 10 feet
overnight. Waves 6 to 10 feet subsiding to 5 to 8 feet Monday.
Waves 5 to 7 feet Monday evening.

$$

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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