Great Lakes Forecast
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609
FZUS63 KMQT 181416
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
1016 AM EDT Sun Jun 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...Low pressure of 29.5 inches over central Upper
Michigan will deepen to 29.3 inches while moving east of Lake
Superior this evening. The low will lift to James Bay and northern
Quebec on Monday, where it will remain nearly stationary through
Wednesday morning. A 30.0 inch ridge drifting across the northern
Plains on Monday will then move to the Upper Great Lakes through
Wednesday. The ridge will move to the Lower Great Lakes on
Thursday as a 29.6 inch low develops over the Upper Mississippi
Valley.

LSZ162-182230-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
1016 AM EDT Sun Jun 18 2017 /916 AM CDT Sun Jun 18 2017/

.REST OF TODAY...Northwest winds less than 10 knots becoming west
5 to 15 knots in the afternoon. Areas of fog. Scattered showers.
Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots. A slight chance of showers.
Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots. A slight chance of showers.
Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A slight chance of rain showers. Waves
calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots. A chance of rain showers.
Waves calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots veering west. Waves
calm to 2 feet.

$$

LSZ263-182230-
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-
1016 AM EDT Sun Jun 18 2017

.REST OF TODAY...North winds less than 10 knots becoming west
5 to 15 knots in the afternoon. Areas of fog. Scattered showers.
Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots veering northwest late.
Patchy fog through midnight. A chance of showers. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest in the
afternoon, then veering west late. A slight chance of rain
showers. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. A slight chance of rain
showers. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing east. A chance of
rain showers. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots veering west. Waves calm to
2 feet.

$$

LSZ264-182230-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
1016 AM EDT Sun Jun 18 2017

.REST OF TODAY...North winds 5 to 15 knots backing northwest in
the afternoon. Areas of fog. Numerous rain showers by late
morning. Scattered rain showers by mid afternoon. Waves calm to
2 feet.
.TONIGHT...Northwest winds 5 to 15 knots. Areas of fog through
midnight. A chance of rain showers. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots backing southwest late. A
slight chance of rain showers. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. A slight chance of rain
showers. Waves calm to 2 feet.
.TUESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...West winds less than 10 knots becoming southeast
5 to 15 knots. A chance of rain showers. Waves calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots veering west. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.

$$

LSZ265-182230-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
1016 AM EDT Sun Jun 18 2017

.REST OF TODAY...North winds 5 to 15 knots backing northwest in
the afternoon, then increasing to 10 to 20 knots late. Areas of
fog. Isolated thunderstorms by late morning. Showers. Waves calm
to 2 feet.
.TONIGHT...West winds 10 to 20 knots. Areas of fog through
midnight. A chance of showers. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. A slight chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. A chance of showers. Waves calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots veering west. Waves
calm to 2 feet.

$$

LSZ266-182230-
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-
1016 AM EDT Sun Jun 18 2017

.REST OF TODAY...North winds 5 to 15 knots becoming northwest
10 to 20 knots in the afternoon. Areas of fog. Scattered
thunderstorms by late morning. Rain showers. Waves calm to 2 feet
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.TONIGHT...Northwest winds 10 to 20 knots. Areas of fog. A chance
of rain showers. Waves building to 1 to 3 feet.
.MONDAY...Northwest winds 10 to 20 knots backing west in the
afternoon, then diminishing to 5 to 15 knots late. A slight
chance of rain showers. Waves subsiding to calm to 2 feet.
.MONDAY NIGHT...Southwest winds 5 to 15 knots becoming west 10 to
20 knots after midnight. A slight chance of rain showers after
midnight. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots becoming southeast 10 to
20 knots. A chance of rain showers. Waves calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots veering southwest.
Waves building to 1 to 3 feet.

$$

LSZ267-182230-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
1016 AM EDT Sun Jun 18 2017

.REST OF TODAY...Northeast winds 5 to 15 knots backing north in
the afternoon, then becoming northwest 10 to 20 knots late. Areas
of fog. Showers and scattered thunderstorms. Waves calm to 2 feet
building to 2 to 4 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots late. Areas of fog. A chance of rain showers. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.MONDAY...West winds 10 to 20 knots. A slight chance of rain
showers through early afternoon. Waves subsiding to calm to
2 feet.
.MONDAY NIGHT...West winds 5 to 15 knots. A slight chance of rain
showers after midnight. Waves calm to 2 feet.
.TUESDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots backing southeast. A chance
of rain showers. Waves calm to 2 feet.
.THURSDAY...Southeast winds 10 to 20 knots veering south. A
chance of rain showers. Waves calm to 2 feet.

$$
LSZ261-182230-
MAFOR 1815/
Superior West 12603 11600 11700 12710 11700 11600. Scattered
showers late this morning through early this evening. Patchy fog
through early evening. Waves 2 feet or less.

Superior North Central 11806 11716 13713 13710. Scattered showers
late this afternoon through late this evening. Waves 1 to 2 feet.

Superior South Central 11816 12716 11713 11613 11620 12610.
Chance of showers late this evening. Waves 1 to 3 feet.

Superior East 11816 13726 12723 11713 11710. Scattered
thunderstorms late this morning through late tonight. Waves 1 to
4 feet.

$$

JSS

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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