Great Lakes Forecast
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FZUS63 KMQT 131944
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
344 PM EDT Fri Apr 13 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 29.3 inch low will track into southern Iowa tonight.
This low will weaken to 29.7 inches as it slowly rotates into the
southern Great Lakes region through the upcoming weekend. By
Monday night, the low will restrengthen to 29.5 inches over the
eastern Great Lakes. A brief ridge of 30.0 inches will 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.

LSZ162-140345-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
344 PM EDT Fri Apr 13 2018 /244 PM CDT Fri Apr 13 2018/

...GALE WARNING IN EFFECT FROM 8 PM EDT /7 PM CDT/ THIS EVENING
THROUGH LATE SUNDAY NIGHT...

.LATE THIS AFTERNOON...Northeast winds 20 to 30 knots. Waves 5 to
8 feet occasionally to 10 feet.
.TONIGHT...Northeast 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.
.SATURDAY...Northeast gales to 40 knots. A slight chance of snow
through early afternoon. Freezing spray. Waves building to 12 to
17 feet occasionally to 21 feet, then subsiding to 11 to 15 feet
occasionally to 19 feet.
.SATURDAY NIGHT...Northeast gales to 35 knots. A chance of snow.
Freezing spray after midnight. Waves subsiding to 9 to 12 feet
occasionally to 15 feet.
.SUNDAY...Northeast gales to 40 knots. Freezing spray through
early afternoon. A chance of snow through early afternoon, then
snow likely by mid afternoon. Waves building to 10 to 14 feet
occasionally to 18 feet.
.SUNDAY NIGHT...Northeast gales to 35 knots diminishing to 15 to
25 knots after midnight. Snow likely through midnight, then a
chance of snow after midnight. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.MONDAY...North winds 10 to 20 knots. A chance of snow showers.
Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Scattered snow showers. Waves subsiding
to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots. Waves subsiding to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots becoming north 5 to
15 knots. Waves subsiding to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ263-140345-
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-
344 PM EDT Fri Apr 13 2018

...GALE WARNING IN EFFECT FROM 8 PM EDT THIS EVENING THROUGH LATE
SUNDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM SATURDAY MORNING
THROUGH SATURDAY AFTERNOON...

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

Note, wave height forecasts are for ice free areas.

$$

LSZ264-140345-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
344 PM EDT Fri Apr 13 2018

...GALE WARNING IN EFFECT FROM 2 AM EDT SATURDAY THROUGH LATE
SUNDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM SATURDAY MORNING
THROUGH SATURDAY AFTERNOON...

.LATE THIS AFTERNOON...North winds 20 to 30 knots. Waves 3 to
6 feet occasionally to 8 feet.
.TONIGHT...Northeast winds 20 to 30 knots increasing to gales to
40 knots after midnight. Freezing spray after midnight. Waves
building to 8 to 11 feet occasionally to 14 feet.
.SATURDAY...Northeast gales to 40 knots. Heavy freezing spray.
Waves subsiding to 7 to 10 feet occasionally to 13 feet.
.SATURDAY NIGHT...East gales to 35 knots. Freezing spray. A
slight chance of snow after midnight. Waves 7 to 10 feet
occasionally to 13 feet.
.SUNDAY...Northeast gales to 40 knots. Freezing spray. Snow
likely by mid afternoon. Waves building to 9 to 12 feet
occasionally to 15 feet.
.SUNDAY NIGHT...Northeast gales to 40 knots. Freezing spray. 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. A chance of snow showers. Waves subsiding to
4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...North winds 20 to 30 knots. Scattered snow
showers. Waves 4 to 7 feet occasionally to 9 feet.
.TUESDAY...North winds 15 to 25 knots diminishing to 5 to
15 knots. Scattered snow showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots becoming north 15 to
25 knots. Waves building to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ265-140345-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
344 PM EDT Fri Apr 13 2018

...GALE WARNING IN EFFECT FROM 2 AM EDT SATURDAY THROUGH LATE
SUNDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM SATURDAY MORNING
THROUGH SATURDAY AFTERNOON...

.LATE THIS AFTERNOON...North winds 20 to 30 knots. A slight
chance of snow. Waves 2 to 4 feet building to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...Northeast winds 20 to 30 knots increase to gales to 40
knots after midnight. A slight chance of snow through midnight.
Freezing spray after midnight. Waves building to 9 to 12 feet
occasionally to 15 feet.
.SATURDAY...Northeast gales to 35 knots becoming east gales to
40 knots in the afternoon. Heavy freezing spray. Waves subsiding
to 8 to 11 feet occasionally to 14 feet.
.SATURDAY NIGHT...East gales to 35 knots. A chance of snow.
Freezing spray after midnight. Waves subsiding to 7 to 10 feet
occasionally to 13 feet, then building to 8 to 11 feet
occasionally to 14 feet.
.SUNDAY...East gales to 40 knots backing northeast by mid
afternoon. Freezing spray. Snow. Waves building to 10 to 14 feet
occasionally to 18 feet.
.SUNDAY NIGHT...Northeast gales to 35 knots diminishing to 20 to
30 knots after midnight. Snow likely. Freezing spray after
midnight. Waves subsiding to 6 to 9 feet occasionally to 11 feet.
.MONDAY...North winds 20 to 30 knots. Freezing spray through
early afternoon. Snow showers likely through early afternoon,
then a chance of snow showers by mid afternoon. Waves subsiding
to 4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...North winds 20 to 30 knots. Numerous snow
showers. Waves 4 to 7 feet occasionally to 9 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 5 to
15 knots. Scattered snow showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots becoming north 15 to
25 knots. Scattered snow showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ266-140345-
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-
344 PM EDT Fri Apr 13 2018

...GALE WARNING IN EFFECT FROM 2 AM EDT SATURDAY THROUGH LATE
SUNDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM SATURDAY MORNING
THROUGH SATURDAY AFTERNOON...

.LATE THIS AFTERNOON...North winds 20 to 30 knots. A slight
chance of snow. Waves 2 to 4 feet building to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Northeast winds 20 to 30 knots increasing to gales to
40 knots after midnight. A slight chance of snow. Freezing spray
after midnight. Waves building to 9 to 12 feet occasionally to
15 feet.
.SATURDAY...Northeast gales to 40 knots. Heavy freezing spray.
Waves subsiding to 8 to 11 feet occasionally to 14 feet.
.SATURDAY NIGHT...East gales to 35 knots. A chance of snow.
Freezing spray after midnight. Waves 8 to 11 feet occasionally to
14 feet.
.SUNDAY...East gales to 35 knots becoming northeast gales to
40 knots by mid afternoon. Freezing spray. Snow likely through
early afternoon. Snow by mid afternoon. Waves building to 10 to
14 feet occasionally to 18 feet.
.SUNDAY NIGHT...Northeast gales to 35 knots diminishing to 20 to
30 knots after midnight. Snow. Freezing spray after midnight.
Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.MONDAY...North winds 20 to 30 knots. Freezing spray through
early afternoon. Snow showers likely by mid afternoon. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.MONDAY NIGHT...North winds 20 to 30 knots. Numerous snow
showers. Waves building to 5 to 8 feet occasionally to 10 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. Scattered snow showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots backing north.
Scattered snow showers. Waves building to 1 to 3 feet, then
subsiding to calm to 2 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ267-140345-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
344 PM EDT Fri Apr 13 2018

...GALE WARNING IN EFFECT FROM 2 AM EDT SATURDAY THROUGH LATE
SUNDAY NIGHT...
...HEAVY FREEZING SPRAY WARNING IN EFFECT FROM SATURDAY MORNING
THROUGH SATURDAY AFTERNOON...

.LATE THIS AFTERNOON...North winds 15 to 25 knots. A slight
chance of snow. Waves 1 to 3 feet building to 2 to 4 feet.
.TONIGHT...Northeast winds 20 to 30 knots increasing to gales to
35 knots late. A slight chance of drizzle and snow through
midnight. Freezing spray after midnight. Waves building to 7 to
10 feet occasionally to 13 feet.
.SATURDAY...Northeast gales to 35 knots diminishing to 20 to
30 knots in the afternoon. Heavy freezing spray. Waves subsiding
to 5 to 8 feet occasionally to 10 feet, then building to 6 to
9 feet occasionally to 11 feet.
.SATURDAY NIGHT...East winds 20 to 30 knots. Freezing spray. A
chance of snow after midnight. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.SUNDAY...East gales to 35 knots backing northeast by mid
afternoon. Freezing spray. Snow likely through early afternoon.
Snow by mid afternoon. Waves building to 8 to 11 feet
occasionally to 14 feet.
.SUNDAY NIGHT...Northeast gales to 35 knots diminishing to 15 to
25 knots after midnight. Freezing spray. Snow. Waves subsiding to
3 to 6 feet occasionally to 8 feet.
.MONDAY...North winds 15 to 25 knots increasing to 20 to 30 knots
by mid afternoon. Freezing spray through early afternoon. Snow
showers likely. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.MONDAY NIGHT...North winds 20 to 30 knots. Scattered snow
showers. Waves building to 4 to 7 feet occasionally to 9 feet.
.TUESDAY...Northwest winds 20 to 30 knots becoming north 10 to
20 knots. Scattered snow showers. Waves subsiding to calm to
2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots becoming north 10 to
20 knots. Scattered snow showers. Waves building to 2 to 4 feet.

Note, wave height forecasts are for ice free areas.

$$

LSZ261-140345-
MAFOR 1321/
Superior West...Gale Warning in effect...11140 13150 11151 13161.
Freezing spray this evening becoming heavy Saturday morning.
Waves 5 to 7 feet building to 9 to 13 feet tonight, then building
to 11 to 16 feet Saturday.

Superior North Central...Gale Warning in effect...11840 11140
11141 12151 12152 11142. Freezing spray overnight becoming heavy
Saturday morning. Waves 3 to 6 feet building to 7 to 10 feet
tonight.

Superior South Central...Gale Warning in effect...11830 12140
13151 12251. Freezing spray this evening becoming heavy Saturday
morning. Waves 2 to 4 feet building to 8 to 12 feet tonight.

Superior East...Gale Warning in effect...11830 11130 11140 14151
11151. Freezing spray late tonight becoming heavy Saturday
morning. Waves 2 to 3 feet building to 6 to 10 feet tonight.

$$

Borchardt

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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