Great Lakes Forecast
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000
FZUS63 KMQT 150201
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1001 PM EDT Sat Oct 14 2017

For waters beyond five 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...Low pressure of 29.8 inches over Iowa will deepen to
29.4 inches as it tracks to Lake Huron by Sunday morning. As the
low moves northeast into Quebec Sunday afternoon, high pressure of
30.4 inches will build into the Plains and extend a 30.1 inch
ridge into the western Great Lakes on Monday. While a weak trough
of 29.9 inches sweeps through the upper Great Lakes Monday and
early Tuesday, a high pressure ridge of 30.1 inches will build
back into the region.

LSZ162-151015-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1001 PM EDT Sat Oct 14 2017 /901 PM CDT Sat Oct 14 2017/

...GALE WARNING IN EFFECT THROUGH SUNDAY MORNING...

.REST OF TONIGHT...Northeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight, then backing north late.
Showers. Waves 5 to 8 feet occasionally to 10 feet building to
8 to 11 feet occasionally to 14 feet.
.SUNDAY...North winds 20 to 30 knots becoming northwest 10 to
20 knots in the afternoon, then backing west late. A chance of
showers through early afternoon. Waves subsiding to 2 to 4 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. Waves building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots veering west after
midnight. Waves subsiding to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots. Waves building
to 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves subsiding to calm to 2 feet.
.THURSDAY...Southwest winds 10 to 20 knots backing south. Waves
building to 1 to 3 feet.

$$

LSZ263-151015-
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-
1001 PM EDT Sat Oct 14 2017

...GALE WARNING IN EFFECT THROUGH SUNDAY MORNING...

.REST OF TONIGHT...Northeast winds 20 to 30 knots increasing to
gales to 35 knots after midnight, then backing north late.
Showers. Waves 3 to 6 feet occasionally to 8 feet building to
8 to 11 feet occasionally to 14 feet.
.SUNDAY...North gales to 35 knots diminishing to 15 to 25 knots
in the afternoon, then becoming northwest 10 to 20 knots late. A
chance of showers through early afternoon. Waves subsiding to
2 to 4 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then backing west late. Waves
subsiding to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots veering west after
midnight. Waves building to 4 to 7 feet occasionally to 9 feet,
then subsiding to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 10 to 20 knots becoming southwest 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots veering west. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
1 to 3 feet.
.THURSDAY...Southwest winds 5 to 15 knots backing south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ264-151015-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1001 PM EDT Sat Oct 14 2017

...GALE WARNING IN EFFECT FROM 5 AM EDT SUNDAY THROUGH SUNDAY
MORNING...

.REST OF TONIGHT...Northeast winds 10 to 20 knots increasing to
gales to 35 knots. Showers. Waves 1 to 3 feet building to 7 to
10 feet occasionally to 13 feet.
.SUNDAY...North gales to 35 knots diminishing to 20 to 30 knots
in the afternoon, then becoming northwest 15 to 25 knots late. A
chance of showers through early afternoon. Waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight, then backing west late. Waves
subsiding to calm to 2 feet.
.MONDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.MONDAY NIGHT...Southwest winds 20 to 30 knots veering west after
midnight. Waves building to 4 to 8 feet occasionally to 10 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 5 to 15 knots
by mid afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...Southwest winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots veering west. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
1 to 3 feet.
.THURSDAY...West winds 5 to 15 knots backing south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ265-151015-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1001 PM EDT Sat Oct 14 2017

...GALE WARNING IN EFFECT FROM 5 AM EDT SUNDAY THROUGH SUNDAY
EVENING...

.REST OF TONIGHT...East winds 20 to 30 knots becoming northeast
gales to 40 knots after midnight. Showers. Waves 3 to 5 feet
occasionally to 7 feet building to 9 to 12 feet occasionally to
15 feet.
.SUNDAY...North gales to 40 knots becoming northwest 20 to
30 knots late. Showers through early afternoon, then a slight
chance of showers by mid afternoon. Waves building to 10 to
14 feet occasionally to 18 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then backing west late. Waves
subsiding to calm to 2 feet.
.MONDAY...West winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots. Waves calm to
2 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots veering west. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.THURSDAY...West winds 10 to 20 knots backing south. Waves
building to 1 to 3 feet.

$$

LSZ266-151015-
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-
1001 PM EDT Sat Oct 14 2017

...GALE WARNING IN EFFECT FROM 5 AM EDT SUNDAY THROUGH SUNDAY
EVENING...

.REST OF TONIGHT...East winds 15 to 25 knots becoming northeast
20 to 30 knots after midnight, then increasing to gales to
45 knots late. Showers. Waves 3 to 5 feet occasionally to 7 feet
building to 9 to 12 feet occasionally to 15 feet.
.SUNDAY...North gales to 45 knots becoming northwest winds 20 to
30 knots late. Showers through early afternoon, then a slight
chance of showers by mid afternoon. Waves building to 12 to 17
feet occasionally to 21 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.
.SUNDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight, then backing west late. Waves
subsiding to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots increasing to 15 to 25 knots
by mid afternoon. Waves subsiding to calm to 2 feet, then
building to 3 to 6 feet occasionally to 8 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots veering west. Waves
building to 3 to 6 feet occasionally to 8 feet, then subsiding to
2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$

LSZ267-151015-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1001 PM EDT Sat Oct 14 2017

...GALE WARNING IN EFFECT FROM 5 AM EDT SUNDAY THROUGH SUNDAY
EVENING...

.REST OF TONIGHT...East winds 15 to 25 knots increasing to 20 to
30 knots after midnight, then becoming northeast gales to
45 knots late. Showers. Waves 1 to 3 feet building to 8 to
11 feet occasionally to 14 feet.
.SUNDAY...Northeast gales to 45 knots backing north in the
afternoon. Showers through early afternoon, then a chance of
showers by mid afternoon. Waves building to 11 to 15 feet
occasionally to 19 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.
.SUNDAY NIGHT...North winds 20 to 30 knots diminishing to 10 to
20 knots after midnight, then backing northwest late. A slight
chance of showers through midnight. Waves subsiding to 1 to
3 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots by mid afternoon. A slight chance of showers through
early afternoon. Waves subsiding to calm to 2 feet, then building
to 2 to 4 feet.
.MONDAY NIGHT...Southwest winds 15 to 25 knots increasing to
20 to 30 knots after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet.
.TUESDAY...West winds 20 to 30 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots becoming south
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...South winds 20 to 30 knots becoming west 15 to
25 knots. Waves building to 3 to 6 feet occasionally to 8 feet,
then subsiding to 2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.

$$
LSZ261-151015-
MAFOR 1503/
Superior West...Gale Warning in effect...11146 11156 11856 11840
11830 11720 11620 11720. Waves 5 to 9 feet overnight. Waves 6 to
10 feet subsiding to 3 to 5 feet Sunday. Waves 2 to 4 feet Sunday
evening.

Superior North Central...Gale Warning in effect...11136 12156
11850 12840 11730 11720. Chance of showers late Sunday morning.
Waves 1 to 3 feet building to 5 to 8 feet overnight. Waves 8 to
11 feet subsiding to 4 to 7 feet Sunday, then to 2 to 4 feet
Sunday evening.

Superior South Central...Gale Warning in effect...11146 12156
11866 11856 11850 11740 11730. Chance of showers early Sunday
afternoon. Waves 3 to 5 feet building to 6 to 9 feet overnight.
Waves 10 to 14 feet subsiding to 8 to 11 feet Sunday. Waves 5 to
8 feet Sunday evening.

Superior East...Gale Warning in effect...11136 11156 12166 11866
12850 11740. Chance of showers late Sunday. Waves 2 to 4 feet
building to 4 to 7 feet overnight. Waves 10 to 14 feet subsiding
to 7 to 10 feet Sunday. Waves 5 to 8 feet Sunday evening.

$$

RJT

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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