Great Lakes Forecast
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795
FZUS63 KMQT 190143
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
943 PM EDT Wed Oct 18 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 28.7 inch low near Hudson Bay through Thursday will
push a trough of 29.7 inches across Lake Superior tonight. 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
Thursday into Friday. 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 30.0 inches will track eastward across Lake
Superior on Sunday ahead of a 29.7 inch trough approaching from
the west on Monday.

LSZ162-190945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
943 PM EDT Wed Oct 18 2017 /843 PM CDT Wed Oct 18 2017/

.REST OF TONIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots late. Waves 3 to 6 feet occasionally to 8 feet building
to 4 to 7 feet occasionally to 9 feet.
.THURSDAY...West winds 15 to 25 knots backing southwest in the
afternoon, then diminishing to 10 to 20 knots late. Waves
subsiding to 1 to 3 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots. Waves 1 to
3 feet.
.FRIDAY...South winds 10 to 20 knots. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. Waves building to
2 to 4 feet.
.SATURDAY...South winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of showers. Waves subsiding
to 1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers. Waves 1 to 3 feet.
.SUNDAY...Southwest winds 10 to 20 knots. A chance of showers.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.MONDAY...West winds 15 to 25 knots veering northwest. Showers
likely, then a chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet.

$$

LSZ263-190945-
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-
943 PM EDT Wed Oct 18 2017

.REST OF TONIGHT...West winds 20 to 30 knots. Waves 5 to 9 feet
occasionally to 11 feet.
.THURSDAY...West winds 20 to 30 knots becoming southwest 15 to
25 knots late. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots. Waves subsiding
to 1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...South winds 5 to 15 knots. Waves subsiding to calm to
2 feet, then building 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 diminishing to 5 to
15 knots by mid afternoon. A chance of showers. Waves subsiding
to 1 to 3 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers. Waves building to 2 to
4 feet.
.SUNDAY...Southwest winds 10 to 20 knots. A chance of showers.
Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.MONDAY...West winds 15 to 25 knots veering northwest. Showers
likely, then a chance of showers. Waves subsiding to 1 to 3 feet,
then building to 3 to 6 feet occasionally to 8 feet.

$$

LSZ264-190945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
943 PM EDT Wed Oct 18 2017

.REST OF TONIGHT...West winds 20 to 30 knots. Waves 5 to 8 feet
occasionally to 10 feet building to 7 to 10 feet occasionally to
13 feet.
.THURSDAY...West winds 20 to 30 knots with gale force gusts to 35
knots...diminishing to 15 to 25 knots late. Waves subsiding to 4
to 7 feet occasionally to 9 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet,
then building to 2 to 4 feet.
.FRIDAY...South winds 5 to 15 knots. Waves subsiding to 1 to
3 feet, then building to 2 to 4 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots. Waves building to
3 to 5 feet occasionally to 7 feet.
.SATURDAY...South winds 10 to 20 knots. Waves 3 to 5 feet
occasionally to 7 feet.
.SATURDAY NIGHT...South winds 10 to 20 knots. A chance of showers
through midnight, then showers likely after midnight. Waves 3 to
5 feet occasionally to 7 feet.
.SUNDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet.
.MONDAY...Southwest winds 10 to 20 knots becoming north 15 to
25 knots. A chance of showers. Waves subsiding to 2 to 4 feet,
then building to 3 to 5 feet occasionally to 7 feet.

$$

LSZ265-190945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
943 PM EDT Wed Oct 18 2017

.REST OF TONIGHT...West winds 20 to 30 knots. Waves 2 to 4 feet
building to 4 to 7 feet occasionally to 9 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 10 to
20 knots late. Waves building to 4 to 7 feet occasionally to
9 feet, then subsiding to 2 to 4 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots. Waves subsiding
to calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots. Waves building to 2 to
4 feet.
.FRIDAY NIGHT...South winds 15 to 25 knots. Waves 2 to 4 feet.
.SATURDAY...South winds 15 to 25 knots. A chance of showers.
Waves 2 to 4 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots. A chance of showers
through midnight, then showers likely after midnight. Waves 2 to
4 feet.
.SUNDAY...Southwest winds 15 to 25 knots. A chance of showers.
Waves subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.MONDAY...Southwest winds 15 to 25 knots veering northwest. A
chance of showers. Waves subsiding to 1 to 3 feet, then building
to 3 to 5 feet occasionally to 7 feet.

$$

LSZ266-190945-
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-
943 PM EDT Wed Oct 18 2017

.REST OF TONIGHT...West winds 20 to 30 knots. Waves 5 to 8 feet
occasionally to 10 feet building to 7 to 10 feet occasionally to
13 feet.
.THURSDAY...West winds 20 to 30 knots with gale force gusts to 35
knots diminishing to 15 to 25 knots. Waves building to 8 to 11
feet occasionally to 14 feet, then subsiding to 5 to 8 feet
occasionally to 10 feet.
.THURSDAY NIGHT...Southwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight, then backing south late. Waves
subsiding to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots. Waves building to 2 to
4 feet.
.FRIDAY NIGHT...South winds 15 to 25 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. 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 15 to 25 knots backing south. Showers
likely. Waves subsiding to 2 to 4 feet, then building to 3 to
5 feet occasionally to 7 feet.
.MONDAY...South winds 15 to 25 knots veering northwest. A chance
of showers. Waves subsiding to 2 to 4 feet, then building to 3 to
6 feet occasionally to 8 feet.

$$

LSZ267-190945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
943 PM EDT Wed Oct 18 2017

.REST OF TONIGHT...Southwest winds 20 to 30 knots with gale force
gusts to 35 knots becoming west 20 to 30 knots after midnight.
Waves 4 to 7 feet occasionally to 9 feet building to 7 to 10 feet
occasionally to 13 feet.
.THURSDAY...West winds 20 to 30 knots with gale force gusts to 35
knots diminishing to 15 to 25 knots late. Waves building to 8 to
11 feet occasionally to 14 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots backing southwest
after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots. 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. A chance of showers.
Waves 2 to 4 feet.
.SATURDAY NIGHT...South winds 15 to 25 knots. A chance of
showers. Waves 2 to 4 feet.
.SUNDAY...Southwest winds 15 to 25 knots. Showers likely. Waves
subsiding to 1 to 3 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.MONDAY...South winds 15 to 25 knots veering southwest. A chance
of showers. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.

$$
LSZ261-190945-
MAFOR 1903/
Superior West 11640 11630 12640 11630 11530 12520. Waves 4 to 7
feet overnight. Waves 5 to 8 feet subsiding to 3 to 6 feet
Thursday. Waves 3 to 5 feet subsiding to 2 to 3 feet Thursday
evening.

Superior North Central 13640 12640 19650 11640 11630 11510. Waves
6 to 9 feet overnight. Waves 8 to 12 feet Thursday. Waves 5 to 8
feet Thursday evening.

Superior South Central 11640 11630 14640 11620 11510. Waves 3 to
6 feet building to 4 to 7 feet overnight. Waves 5 to 8 feet
Thursday. Waves 3 to 5 feet subsiding to 1 to 3 feet Thursday
evening.

Superior East 14640 11640 19650 11640 11630 11620. Waves 5 to 9
feet overnight. Waves 7 to 10 feet building to 9 to 13 feet
Thursday. Waves 7 to 10 feet subsiding to 5 to 7 feet Thursday
evening.

$$

Petro

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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