Great Lakes Forecast
Issued by NWS

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000
FZUS63 KMQT 150801
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
401 AM 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 Indiana will cross the Great
Lakes early this week, 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.

LSZ162-151615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
401 AM EDT Sun Apr 15 2018 /301 AM CDT Sun Apr 15 2018/

...GALE WARNING IN EFFECT THROUGH MONDAY MORNING...

.EARLY THIS MORNING...East gales to 45 knots. A chance of snow.
Waves 12 to 17 feet occasionally to 21 feet.
.TODAY...Northeast gales to 45 knots. Freezing spray. Snow. Waves
building to 15 to 20 feet occasionally to 25 feet.
.TONIGHT...Northeast gales to 45 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 15 to 25 knots. Freezing spray through
early afternoon. A chance of snow showers. Waves subsiding to
6 to 9 feet occasionally to 11 feet.
.MONDAY NIGHT...North winds 15 to 25 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 northeast 5 to
15 knots by mid afternoon. A chance of snow showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY NIGHT...East winds 5 to 15 knots increasing to 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...Northeast winds 5 to 15 knots diminishing to less
than 10 knots. Waves subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-151615-
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-
401 AM EDT Sun Apr 15 2018

...GALE WARNING IN EFFECT THROUGH MONDAY MORNING...

.EARLY THIS MORNING...East gales to 40 knots. Freezing spray. A
chance of snow. Waves 11 to 15 feet occasionally to 19 feet.
.TODAY...East gales to 45 knots backing northeast in the
afternoon. Freezing spray. A chance of snow through early
afternoon. Snow by mid afternoon. Waves building to 15 to 20 feet
occasionally to 25 feet.
.TONIGHT...Northeast gales to 45 knots. Snow. Freezing spray
after midnight. Waves subsiding to 10 to 14 feet occasionally to
18 feet.
.MONDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Freezing spray through early
afternoon. Snow showers likely. 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. 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 diminishing to 10 to
20 knots by mid afternoon. A chance of snow showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.TUESDAY NIGHT...North winds 5 to 15 knots becoming northeast
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. A chance of snow
showers. 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 1 to 3 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ264-151615-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
401 AM EDT Sun Apr 15 2018

...GALE WARNING IN EFFECT THROUGH MONDAY MORNING...

.EARLY THIS MORNING...East gales to 40 knots. Freezing spray. A
slight chance of snow. Waves 10 to 14 feet occasionally to
18 feet.
.TODAY...East gales to 45 knots backing northeast in the
afternoon. Freezing spray through early afternoon. A slight
chance of snow through early afternoon, then snow by mid
afternoon. Waves building to 12 to 17 feet occasionally to
21 feet.
.TONIGHT...Northeast storm force winds to 50 knots diminishing to
gales to 45 knots after midnight. Freezing spray. Snow. Waves
subsiding to 10 to 14 feet occasionally to 18 feet.
.MONDAY...Northeast gales to 35 knots becoming north 20 to
30 knots in the afternoon. Freezing spray. Snow showers. 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 chance of snow showers. 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 increasing to 20 to
30 knots. Waves building to 5 to 8 feet occasionally to 10 feet.
.THURSDAY...North winds 10 to 20 knots. Waves subsiding to 3 to
6 feet occasionally to 8 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-151615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
401 AM EDT Sun Apr 15 2018

...GALE WARNING IN EFFECT THROUGH MONDAY MORNING...

.EARLY THIS MORNING...East gales to 40 knots. Freezing spray. A
chance of snow. Waves 10 to 14 feet occasionally to 18 feet.
.TODAY...East gales to 45 knots backing northeast in the
afternoon. Freezing spray. Snow. Waves building to 12 to 17 feet
occasionally to 21 feet.
.TONIGHT...Northeast gales to 45 knots. Snow. Waves subsiding to
8 to 11 feet occasionally to 14 feet.
.MONDAY...North winds 20 to 30 knots. Snow showers likely. Waves
subsiding to 6 to 9 feet occasionally to 11 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. 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. 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.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-151615-
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-
401 AM EDT Sun Apr 15 2018

...GALE WARNING IN EFFECT THROUGH MONDAY MORNING...

.EARLY THIS MORNING...East gales to 40 knots. Freezing spray. A
chance of snow. Waves 10 to 14 feet occasionally to 18 feet.
.TODAY...East gales to 45 knots backing northeast late. Freezing
spray. A chance of snow through early afternoon. Snow by mid
afternoon. Waves building to 12 to 17 feet occasionally to
21 feet.
.TONIGHT...Northeast gales to 45 knots. Snow. Waves subsiding to
8 to 11 feet occasionally to 14 feet.
.MONDAY...Northeast winds 20 to 30 knots backing north in the
afternoon. Snow showers. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.MONDAY NIGHT...North winds 20 to 30 knots. Snow showers likely
through midnight, then a chance of snow showers after midnight.
Waves 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 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 20 to
30 knots. 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.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-151615-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
401 AM EDT Sun Apr 15 2018

...GALE WARNING IN EFFECT THROUGH MONDAY MORNING...

.EARLY THIS MORNING...East gales to 35 knots. Freezing spray. A
slight chance of snow. Waves 8 to 11 feet occasionally to 14 feet
subsiding to 7 to 10 feet occasionally to 13 feet.
.TODAY...East gales to 45 knots backing northeast late. Freezing
spray. A chance of snow through early afternoon. Snow by mid
afternoon. Waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 9 to 12 feet occasionally to 15 feet.
.TONIGHT...Northeast gales to 40 knots diminishing to 20 to
30 knots late. Snow. Waves subsiding to 5 to 8 feet occasionally
to 10 feet.
.MONDAY...Northeast winds 20 to 30 knots becoming north 15 to
25 knots in the afternoon. Snow showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.MONDAY NIGHT...North winds 15 to 25 knots increasing to 20 to
30 knots after midnight. Snow showers likely through midnight,
then a chance of snow showers after midnight. Waves building to
4 to 7 feet occasionally to 9 feet.
.TUESDAY...North winds 20 to 30 knots becoming northwest 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 increasing to 15 to
25 knots. Waves building to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. A chance of snow showers, possibly mixed with rain.
Waves subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-151615-
MAFOR 1509/
Superior West...Gale Warning in effect...11260 11160 14167 11167
11157. Freezing spray this afternoon. Chance of snow this
morning. Freezing spray late tonight. Waves 12 to 17 feet
building to 14 to 18 feet today. Waves 13 to 18 feet subsiding to
12 to 16 feet tonight.

Superior North Central...Gale Warning in effect...12251 11161
11157 13167 11157. Freezing spray early this morning. Freezing
spray early this afternoon. Chance of snow early this afternoon.
Freezing spray tonight. Waves 10 to 15 feet today. Waves 12 to 17
feet subsiding to 10 to 14 feet tonight.

Superior South Central...Gale Warning in effect...11251 11257
11157 12167 13157. Freezing spray. Chance of snow this morning.
Freezing spray through early evening tonight. Waves 10 to 15 feet
building to 12 to 17 feet today. Waves 12 to 17 feet subsiding to
10 to 14 feet tonight.

Superior East...Gale Warning in effect...12251 11261 13167 12157.
Freezing spray from early this morning on. Chance of snow late
this morning. Waves 8 to 12 feet building to 10 to 14 feet today.
Waves 10 to 14 feet subsiding to 8 to 11 feet tonight.

$$

Titus

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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