Great Lakes Forecast
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319
FZUS63 KMQT 191402
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1002 AM EDT Thu Oct 19 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...A nearly stationary 30.2 inch area of high pressure
across the Mid Atlantic states will push a 30.0 inch ridge across
Lake Superior late this afternoon and tonight. A 29.1 inch low
pressure over the Canadian Prairies on Friday will track toward
Hudson Bay through Sunday, passing a 29.8 inch trough across Lake
Superior by Saturday night. Weak ridging of 29.9 inches will track
eastward across Lake Superior on Sunday ahead of a 29.7 inch
trough approaching from the west on Monday.

LSZ162-192215-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1002 AM EDT Thu Oct 19 2017 /902 AM CDT Thu Oct 19 2017/

.REST OF TODAY...West winds 20 to 30 knots becoming southwest
15 to 25 knots in the afternoon, then diminishing to 10 to
20 knots late. Waves 5 to 8 feet occasionally to 10 feet
subsiding to 2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. A slight chance of
showers after midnight. Waves building to 2 to 4 feet.
.SATURDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Showers likely by mid afternoon. Waves
subsiding to 1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Showers likely through midnight, then a chance of
showers after midnight. Waves 1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest. A chance
of showers. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming northwest 15 to
25 knots. A chance of showers. Waves subsiding to calm to 2 feet,
then building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ263-192215-
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-
1002 AM EDT Thu Oct 19 2017

...GALE WARNING IN EFFECT UNTIL 2 PM EDT THIS AFTERNOON...

.REST OF TODAY...West gales to 35 knots becoming southwest 20 to
30 knots by mid afternoon. Waves 8 to 11 feet occasionally to 14
feet subsiding to 3 to 6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 10 to 20 knots. Waves subsiding to
1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south in the
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. Waves building to
2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots. A chance of showers.
Waves subsiding to 1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Showers likely. Waves 1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest. Waves 1 to
3 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming north 15 to
25 knots. A chance of showers. Waves subsiding to calm to 2 feet,
then building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ264-192215-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1002 AM EDT Thu Oct 19 2017

...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

.REST OF TODAY...West gales to 35 knots diminishing to 20 to 30
knots late. Waves 9 to 12 feet occasionally to 15 feet subsiding
to 5 to 8 feet occasionally to 10 feet.
.TONIGHT...Southwest winds 10 to 20 knots. Waves subsiding to
1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...Southwest winds 5 to 15 knots backing south in the
afternoon. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. Waves building to
2 to 4 feet.
.SATURDAY...South winds 10 to 20 knots. A chance of showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots. A chance of showers
through midnight, then showers likely after midnight. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.SUNDAY...Southwest winds 10 to 20 knots. Showers likely. Waves
subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming north 20 to
30 knots. A chance of showers. Waves building to 5 to 8 feet
occasionally to 10 feet.

$$

LSZ265-192215-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1002 AM EDT Thu Oct 19 2017

.REST OF TODAY...West winds 20 to 30 knots with a few gale force
gusts to 35 knots diminishing to 15 to 25 knots through the
afternoon. Waves 5 to 8 feet occasionally to 10 feet subsiding to
2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. Waves building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.SATURDAY...South winds 15 to 25 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots. A chance of
showers. Waves subsiding to 2 to 4 feet.
.SUNDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots. Showers likely. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming north 20 to
30 knots. A chance of showers. Waves building to 5 to 8 feet
occasionally to 10 feet.

$$

LSZ266-192215-
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-
1002 AM EDT Thu Oct 19 2017

...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

.REST OF TODAY...West gales to 40 knots diminishing to 20 to 30
knots late. Waves 9 to 12 feet occasionally to 15 feet subsiding
to 6 to 9 feet occasionally to 11 feet.
.TONIGHT...Southwest winds 10 to 20 knots. Waves subsiding to
1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.FRIDAY NIGHT...South winds 20 to 30 knots. Waves building to
3 to 5 feet occasionally to 7 feet.
.SATURDAY...South winds 15 to 25 knots. A chance of showers.
Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...South winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of showers through midnight,
then showers likely after midnight. Waves building to 4 to 7 feet
occasionally to 9 feet, then subsiding to 3 to 5 feet
occasionally to 7 feet.
.SUNDAY...Southwest winds 15 to 25 knots. Showers likely. Waves
subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 15 to 25 knots becoming north 20 to
30 knots. A chance of showers. Waves building to 5 to 8 feet
occasionally to 10 feet.

$$

LSZ267-192215-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1002 AM EDT Thu Oct 19 2017

...GALE WARNING IN EFFECT UNTIL 5 PM EDT THIS AFTERNOON...

.REST OF TODAY...West gales to 40 knots diminishing to 20 to
30 knots late. Waves 8 to 12 feet occasionally to 15 feet
subsiding to 6 to 9 feet occasionally to 11 feet.
.TONIGHT...West winds 10 to 20 knots backing southwest after
midnight, then increasing to 15 to 25 knots late. Waves subsiding
to 1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...Southwest winds 15 to 25 knots becoming south 10 to
20 knots in the afternoon, then increasing to 15 to 25 knots
late. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. Waves building to
2 to 4 feet.
.SATURDAY...South winds 15 to 25 knots. Waves building to 3 to
5 feet occasionally to 7 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots. A chance of
showers. Waves subsiding to 2 to 4 feet.
.SUNDAY...Southwest winds 15 to 25 knots diminishing to 10 to
20 knots. Showers likely, then a chance of showers. Waves
subsiding to calm to 2 feet.
.MONDAY...South winds 15 to 25 knots backing north. A chance of
showers. Waves building to 4 to 7 feet occasionally to 9 feet.

$$
LSZ261-192215-
MAFOR 1915/
Superior West...11640 19650 11530 15520. Waves 5 to 8 feet
subsiding to 3 to 6 feet this afternoon. Waves subsiding to 1 to
3 feet tonight and Friday morning.

Superior North Central...Gale Warning in effect...12650 11640
12520 11530 12520. Waves 8 to 12 feet this afternoon subsiding to
2 to 4 feet tonight and Friday morning.

Superior South Central...Gale Warning in effect...11650 11640
11630 14510 11420. Waves 5 to 8 feet this afternoon subsiding to
3 feet or less tonight and Friday morning.

Superior East...Gale Warning in effect...12650 11640 11620 11510
13520. Waves 9 to 12 feet this afternoon subsiding to 2 to 5 feet
tonight and Friday morning.

$$

Kluber

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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