Great Lakes Forecast
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FZUS63 KMQT 200145
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
945 PM 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 South pushed a 30.0 inch ridge across Lake
Superior this evening that will move off to the east through
Friday morning. A 29.1 inch low pressure over the Canadian
Prairies midday Friday will track toward Western Hudson Bay
through Sunday, passing a 29.7 inch trough across Lake Superior
Saturday night. Weak ridging of 30.0 inches will track eastward
across Lake Superior late Sunday ahead of a 29.7 inch trough
approaching from the west on Monday.

LSZ162-200945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
945 PM EDT Thu Oct 19 2017 /845 PM CDT Thu Oct 19 2017/

.REST OF TONIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet building to 1 to 3 feet, then subsiding to calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing east late. Waves calm
to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
A slight chance of showers after midnight. 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
through early afternoon, then showers likely and a slight chance
of thunderstorms by mid afternoon. Waves subsiding to 1 to
3 feet.
.SATURDAY NIGHT...Southwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Showers through midnight, then a
chance of showers after midnight. Waves 1 to 3 feet.
.SUNDAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots by mid afternoon. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves building to 2 to 4 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.
.TUESDAY...North winds 20 to 30 knots. A chance of rain showers.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 2 to 4 feet.

$$

LSZ263-200945-
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-
945 PM EDT Thu Oct 19 2017

.REST OF TONIGHT...Southwest winds 5 to 15 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.FRIDAY...South winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
A slight chance of showers after midnight. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SATURDAY...South winds 10 to 20 knots. A chance of showers. A
slight chance of thunderstorms 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 building to 2 to 4 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest by mid
afternoon. A chance of showers. Waves 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots. Waves 2 to
4 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming northwest 15 to
25 knots. A chance of showers. Waves subsiding to 1 to 3 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.TUESDAY...North winds 20 to 30 knots. A chance of rain showers.
Waves building to 5 to 8 feet occasionally to 10 feet, then
subsiding to 3 to 5 feet occasionally to 7 feet.

$$

LSZ264-200945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
945 PM EDT Thu Oct 19 2017

.REST OF TONIGHT...Southwest winds 5 to 15 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 1 to 3 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast late. Waves
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 and a
slight chance of thunderstorms by mid afternoon. Waves building
to 3 to 6 feet occasionally to 8 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Showers likely. Waves subsiding to 2 to 4 feet.
.SUNDAY...Southwest winds 10 to 20 knots. A chance of showers.
Waves 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves 2 to 4 feet.
.MONDAY...Southwest winds 10 to 20 knots veering northwest. A
chance of showers. Waves subsiding to 1 to 3 feet, then building
to 2 to 4 feet.
.TUESDAY...North winds 20 to 30 knots. A chance of rain showers.
Waves building to 6 to 9 feet occasionally to 11 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.

$$

LSZ265-200945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
945 PM EDT Thu Oct 19 2017

.REST OF TONIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
late. 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 and a
slight chance of thunderstorms by mid afternoon. 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 veering southwest
after midnight. A chance of showers through midnight, then
showers likely after midnight. Waves subsiding to 1 to 3 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots
by mid afternoon. Showers likely through early afternoon, then a
chance of showers by mid afternoon. Waves subsiding to calm to
2 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots. Waves calm to
2 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming west 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.
.TUESDAY...North winds 20 to 30 knots. A chance of rain showers,
then rain showers likely. Waves building to 6 to 9 feet
occasionally to 11 feet, then subsiding to 4 to 7 feet
occasionally to 9 feet.

$$

LSZ266-200945-
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-
945 PM EDT Thu Oct 19 2017

.REST OF TONIGHT...Southwest winds 10 to 20 knots. Waves 3 to
6 feet occasionally to 8 feet subsiding to 2 to 4 feet.
.FRIDAY...South winds 10 to 20 knots. 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 20 to 30 knots. A chance of showers and a
slight chance of thunderstorms by mid afternoon. 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 subsiding to 3 to
5 feet occasionally to 7 feet.
.SUNDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots by mid afternoon. Showers likely through early
afternoon, then a chance of showers by mid afternoon. Waves
subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight. Waves subsiding to 1 to 3 feet.
.MONDAY...Southwest winds 15 to 25 knots veering west. A chance
of showers. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.TUESDAY...North winds 20 to 30 knots. A chance of rain showers,
then rain showers likely. Waves building to 7 to 10 feet
occasionally to 13 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.

$$

LSZ267-200945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
945 PM EDT Thu Oct 19 2017

.REST OF TONIGHT...Southwest winds 10 to 20 knots. Waves 3 to 7
feet occasionally to 9 feet subsiding to 1 to 3 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing south in the
afternoon, then increasing to 15 to 25 knots late. Waves 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 increasing to 20 to
30 knots by mid afternoon. A slight chance of showers by mid
afternoon. 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 becoming west 10 to
20 knots by mid afternoon. Showers. Waves subsiding to 1 to
3 feet.
.SUNDAY NIGHT...Southwest winds 10 to 20 knots. A chance of
showers through midnight. Waves 1 to 3 feet.
.MONDAY...Southwest winds 15 to 25 knots veering west. A chance
of showers. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.TUESDAY...North winds 15 to 25 knots increasing to 20 to
30 knots. A chance of rain showers, then rain showers likely.
Waves building to 4 to 7 feet occasionally to 9 feet, then
subsiding to 3 to 6 feet occasionally to 8 feet.

$$
LSZ261-200945-
MAFOR 2003/
Superior West 14510 11400 11300 11310 11420. Waves 3 feet or less.

Superior North Central 14510 11410 12310 11420. Waves 1 to 5
feet.

Superior South Central 11410 12510 13410 11420 11430. Waves 1 to
4 feet.

Superior East 13510 11520 11420 11410 11420 11430. Waves 2 to 5
feet.

$$

KCW

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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