Great Lakes Forecast
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736
FZUS63 KMQT 160739
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
339 AM EDT Mon Oct 16 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 29.2 inch low pressure system in the Canadian
Maritimes will move into the Atlantic this morning as high pressure
of 30.4 inches builds into the central Plains and extends a 30.1
inch ridge into the Upper Great Lakes today. A weak trough of 29.9
inches will move across the Upper Great Lakes tonight through
Tuesday night. A deeper trough of low pressure at 29.7 inches will
sweep through the Upper Great Lakes on Wednesday before being
replaced with a 30.0 inch ridge of high pressure on Thursday. A 29.9
inch trough will move into the Upper Great Lakes on Friday.

LSZ162-161545-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
339 AM EDT Mon Oct 16 2017 /239 AM CDT Mon Oct 16 2017/

.TODAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots in the afternoon. Waves 1 to 3 feet building to 3 to 5
feet occasionally to 7 feet.
.TONIGHT...Southwest winds 15 to 25 knots becoming west 10 to
20 knots late. Waves building to 3 to 6 feet occasionally to
8 feet, then subsiding to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots backing southwest in the
afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots. Waves building to
3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
2 to 4 feet.
.THURSDAY...West winds 10 to 20 knots backing southwest. Waves
subsiding to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots. Waves building to 2 to 4
feet.

$$

LSZ263-161545-
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-
339 AM EDT Mon Oct 16 2017

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves 2 to
4 feet.
.TODAY...West winds 10 to 20 knots becoming southwest 15 to
25 knots in the afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west late.
Waves building to 4 to 8 feet occasionally to 10 feet.
.TUESDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon, then backing southwest late. Waves subsiding to
1 to 3 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. Waves subsiding to calm to 2 feet, then building
to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots. Waves building to
4 to 7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots. Waves subsiding to
3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.FRIDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
Waves subsiding to calm to 2 feet, then building to 2 to 4 feet.

$$

LSZ264-161545-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
339 AM EDT Mon Oct 16 2017

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves 1 to
3 feet.
.TODAY...West winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon, then backing southwest late. Waves building to
3 to 6 feet occasionally to 8 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west late.
Waves building to 4 to 8 feet occasionally to 10 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon, then becoming southwest 5 to 15 knots
late. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots. Waves building to
4 to 7 feet occasionally to 9 feet, then subsiding to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots. Waves 4 to 7 feet
occasionally to 9 feet.
.THURSDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. Waves subsiding to 3 to 6 feet occasionally to 8 feet,
then building to 4 to 7 feet occasionally to 9 feet.
.FRIDAY...South winds 5 to 15 knots. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.

$$

LSZ265-161545-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
339 AM EDT Mon Oct 16 2017

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves 1 to
3 feet.
.TODAY...West winds 15 to 25 knots diminishing to 10 to 20 knots
in the afternoon. Waves 1 to 3 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west late.
Waves building to 3 to 6 feet occasionally to 8 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to calm to 2 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. Waves building to 1 to 3 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots. Waves building to
2 to 4 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.THURSDAY...West winds 15 to 25 knots becoming southwest 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.

$$

LSZ266-161545-
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-
339 AM EDT Mon Oct 16 2017

.EARLY THIS MORNING...West winds 10 to 20 knots. Isolated rain
showers. Waves 1 to 3 feet.
.TODAY...West winds 15 to 25 knots. Isolated rain showers through
early afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.TONIGHT...Southwest winds 15 to 25 knots veering west late.
Waves building to 4 to 8 feet occasionally to 10 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots in the afternoon. Waves subsiding to 1 to 3 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...South winds 20 to 30 knots. Waves building to 4 to
7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. Waves 4 to 7 feet
occasionally to 9 feet.
.THURSDAY...West winds 20 to 30 knots becoming southwest 15 to
25 knots. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots. Waves building to 2 to
4 feet.

$$

LSZ267-161545-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
339 AM EDT Mon Oct 16 2017

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Scattered
rain showers. Waves 1 to 3 feet.
.TODAY...Southwest winds 15 to 25 knots veering west in the
afternoon. Isolated showers through early afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.TONIGHT...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. Waves subsiding to 2 to 4 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Waves subsiding to calm to 2 feet, then
building to 2 to 4 feet.
.WEDNESDAY...South winds 20 to 30 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...Southwest winds 20 to 30 knots veering west
after midnight. Waves building to 4 to 7 feet occasionally to
9 feet.
.THURSDAY...West winds 20 to 30 knots becoming southwest 15 to
25 knots. Waves building to 5 to 8 feet occasionally to 10 feet,
then subsiding to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. Waves 1 to 3 feet.

$$

LSZ261-161545-
MAFOR 1609/
Superior West 12620 11520 14530 11530. Waves 1 to 3 feet building
to 3 to 5 feet today. Waves 3 to 6 feet building to 4 to 7 feet
tonight.

Superior North Central 11610 12620 11630 12530 12540. Waves 2 to
4 feet building to 3 to 6 feet today. Waves 5 to 8 feet tonight.

Superior South Central 14620 12520 12530. Waves 2 to 4 feet
subsiding to 1 to 3 feet today. Waves 1 to 3 feet building to 3
to 5 feet tonight.

Superior East 11510 11520 12630 11620 11520 12530. Scattered
showers this morning. Waves 2 to 4 feet building to 3 to 5 feet
today. Waves 3 to 6 feet building to 5 to 7 feet tonight.

$$

07

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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