Great Lakes Forecast
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FZUS63 KMQT 230751
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
351 AM EDT Fri Jun 23 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...As a 29.5 inch low over northern Ontario drifts to
the Canadian maritime provinces through Sunday, 29.6 inch low
pressure troughing will remain across the Upper Great Lakes. High
pressure ridging of 30.0 inches will build into the Upper Great
Lakes late Sunday into Tuesday as 30.3 inch high pressure shifts
eastward across the Mid Mississippi Valley. Tuesday into
Wednesday, low pressure of 29.5 inches will lift out of the
Northern Plains and head towards the Upper Great Lakes.

LSZ162-231600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
351 AM EDT Fri Jun 23 2017 /251 AM CDT Fri Jun 23 2017/

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TODAY...West winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. A slight chance of rain showers by mid
afternoon. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. A slight chance of showers. Waves
subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots increasing to 10 to 20 knots
late. A chance of rain showers. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots veering northwest
after midnight. A chance of rain showers. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots backing west by mid
afternoon. A chance of rain showers. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots backing south. A chance
of showers. Waves building to 1 to 3 feet.

$$

LSZ263-231600-
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-
351 AM EDT Fri Jun 23 2017

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Waves 1 to
3 feet.
.TODAY...West winds 10 to 20 knots increasing to 15 to 25 knots
late. A slight chance of rain showers by mid afternoon. Waves
building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. A slight chance of rain showers. Waves subsiding
to 1 to 3 feet.
.SATURDAY...West winds 5 to 15 knots. A chance of rain showers.
Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. A chance of rain showers. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. A chance of rain showers. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots backing south. A chance
of showers. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.

$$

LSZ264-231600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
351 AM EDT Fri Jun 23 2017

.EARLY THIS MORNING...Southwest winds 10 to 20 knots. Patchy fog.
Waves 1 to 3 feet.
.TODAY...Southwest winds 10 to 20 knots veering west late. Patchy
fog through early afternoon. A slight chance of rain showers by
mid afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.TONIGHT...West winds 10 to 20 knots becoming northwest 5 to
15 knots after midnight. A slight chance of rain showers. Waves
subsiding to calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots backing west in the
afternoon. A slight chance of rain showers. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. A chance of rain showers. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...West winds 5 to 15 knots. Waves building to 1 to
3 feet.
.TUESDAY...Southwest winds 5 to 15 knots. A chance of rain
showers. Waves building to 2 to 4 feet, then subsiding to calm to
2 feet.

$$

LSZ265-231600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
351 AM EDT Fri Jun 23 2017

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...West winds 10 to 20 knots increasing to 20 to 30 knots.
Waves building to 1 to 3 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots. A slight chance of
showers. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 10 to 20 knots. A slight chance of
showers. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.MONDAY...West winds 10 to 20 knots. Waves building to 1 to
3 feet.
.TUESDAY...West winds 10 to 20 knots backing southwest. A chance
of showers. Waves subsiding to calm to 2 feet.

$$

LSZ266-231600-
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-
351 AM EDT Fri Jun 23 2017

.EARLY THIS MORNING...West winds 10 to 20 knots. Patchy fog.
Waves calm to 2 feet building to 1 to 3 feet.
.TODAY...West winds 10 to 20 knots increasing to 15 to 25 knots
in the afternoon. Patchy fog. Waves building to 3 to 5 feet
occasionally to 7 feet.
.TONIGHT...West winds 15 to 25 knots becoming northwest 10 to
20 knots after midnight. Waves subsiding to 1 to 3 feet.
.SATURDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots late. A slight chance of rain showers. Waves subsiding
to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots. A chance of
rain showers. Waves calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots. Waves calm to
2 feet.
.MONDAY...Northwest winds 10 to 20 knots backing west. Waves
building to 2 to 4 feet.
.TUESDAY...West winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet.

$$

LSZ267-231600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
351 AM EDT Fri Jun 23 2017

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...West winds 5 to 15 knots increasing to 10 to 20 knots
late. Patchy fog. Waves calm to 2 feet.
.TONIGHT...West winds 10 to 20 knots becoming northwest 5 to
15 knots late. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. A chance of rain showers. Waves calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots becoming west 10 to
20 knots. Waves building to 1 to 3 feet.
.TUESDAY...West winds 10 to 20 knots backing south. Waves
subsiding to calm to 2 feet.

$$

LSZ261-231600-
MAFOR 2309/
Superior West 11620 11630 11530 12630 13620. Waves 2 to 4 feet.

Superior North Central 13520 11530 11630 11620 12710. Patchy fog.
Waves 1 to 5 feet.

Superior South Central 11620 11610 13630 13620. Waves 1 to 3
feet.

Superior East 11620 12600 13620 11610 11710. Patchy fog. Waves 1
to 3 feet.

$$

Ritzman

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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