Great Lakes Forecast
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FZUS63 KMQT 220809
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
409 AM EDT Sat Jul 22 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 low pressure of 29.7 inches will track across the
Great Lakes region this afternoon tonight into Sunday. Sunday
into Monday, a 30.0 inch high will start building across the Upper
Mississippi Valley and slowly push the 29.7 inch low across the
Eastern Great Lakes. The ridge of high pressure will build into
the Upper Great Lakes on Monday. Trailing this surface high will
be a trough at 29.8 inches that will push across the Upper Great
Lakes on Tuesday night. A 30.0 inch ridge builds in behind the
surface trough Wednesday night and drops down into the Upper
Mississippi Valley by Friday.

LSZ162-221615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
409 AM EDT Sat Jul 22 2017 /309 AM CDT Sat Jul 22 2017/

.EARLY THIS MORNING...Northeast winds 15 to 25 knots. A slight
chance of showers. Waves 1 to 3 feet.
.TODAY...Northeast winds 15 to 25 knots diminishing to 5 to
15 knots. A chance of showers and thunderstorms. Waves subsiding
to calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots backing northwest late.
Patchy fog. A chance of showers and thunderstorms. Waves calm to
2 feet.
.SUNDAY...Northwest winds 10 to 20 knots veering northeast in the
afternoon. A slight chance of showers through early afternoon.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots backing northwest
after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...Southwest winds 10 to 20 knots veering west. A chance
of thunderstorms. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ263-221615-
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-
409 AM EDT Sat Jul 22 2017

.EARLY THIS MORNING...East winds 10 to 20 knots. A slight chance
of showers. Waves calm to 2 feet building to 1 to 3 feet.
.TODAY...East winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. A chance of showers and thunderstorms. Waves
1 to 3 feet.
.TONIGHT...Northeast winds 5 to 15 knots backing north after
midnight. Patchy fog. A chance of showers and thunderstorms.
Waves subsiding to calm to 2 feet, then building to 1 to 3 feet.
.SUNDAY...North winds 10 to 20 knots veering northeast in the
afternoon. A chance of showers through early afternoon. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds less than 10 knots increasing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering west. A chance of
thunderstorms. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-221615-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
409 AM EDT Sat Jul 22 2017

.EARLY THIS MORNING...East winds 10 to 20 knots. A slight chance
of showers. Waves calm to 2 feet building to 1 to 3 feet.
.TODAY...East winds 10 to 20 knots. A slight chance of showers
through early afternoon. A chance of thunderstorms. Showers
likely by mid afternoon. Waves 1 to 3 feet.
.TONIGHT...East winds 5 to 15 knots becoming northeast 10 to
20 knots late. Areas of fog. Showers likely and a chance of
thunderstorms. Waves subsiding to calm to 2 feet, then building
to 1 to 3 feet.
.SUNDAY...Northeast winds 10 to 20 knots. A slight chance of
thunderstorms through early afternoon. A chance of showers. Waves
1 to 3 feet.
.SUNDAY NIGHT...North winds 5 to 15 knots backing northwest after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds less than 10 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering southwest. A chance
of thunderstorms. A chance of showers. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ265-221615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
409 AM EDT Sat Jul 22 2017

.EARLY THIS MORNING...East winds 10 to 20 knots. A slight chance
of showers. Waves calm to 2 feet.
.TODAY...East winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight, then backing northwest late. Patchy fog. Showers
likely through midnight. A chance of thunderstorms. A chance of
showers after midnight. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.SUNDAY...Northwest winds 10 to 20 knots becoming northeast 15 to
25 knots in the afternoon. A slight chance of thunderstorms
through early afternoon. A chance of showers. Waves building to
1 to 3 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots veering southwest. A chance
of showers. Waves building to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.

$$

LSZ266-221615-
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-
409 AM EDT Sat Jul 22 2017

.EARLY THIS MORNING...East winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.TODAY...East winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots. Patchy fog. Showers likely
and a chance of thunderstorms. Waves subsiding to calm to 2 feet,
then building to 2 to 4 feet.
.SUNDAY...East winds 10 to 20 knots becoming northeast 15 to
25 knots in the afternoon. A slight chance of thunderstorms
through early afternoon. A chance of showers. Waves 2 to 4 feet,
then subsiding to 1 to 3 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. A slight chance of showers through midnight.
Waves subsiding to calm to 2 feet.
.MONDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots becoming southwest 15 to
25 knots. A chance of showers. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots veering northwest. Waves
subsiding to calm to 2 feet.

$$

LSZ267-221615-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
409 AM EDT Sat Jul 22 2017

.EARLY THIS MORNING...Southeast winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.TODAY...East winds 10 to 20 knots diminishing to 5 to 15 knots
in the afternoon. A chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots increasing to 15 to 25 knots
late. Showers and a chance of thunderstorms. Patchy fog after
midnight. Waves building to 1 to 3 feet.
.SUNDAY...East winds 15 to 25 knots backing northeast late.
Showers likely and a chance of thunderstorms through early
afternoon, then a chance of showers by mid afternoon. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.SUNDAY NIGHT...Northeast winds 15 to 25 knots becoming north
10 to 20 knots after midnight. A slight chance of showers through
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots backing south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots increasing to 15 to
25 knots. A chance of showers. Waves building to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots veering northwest. Waves
subsiding to calm to 2 feet.

$$

LSZ261-221615-
MAFOR 2209/
Superior West 11230 11130 12120 13110 11800. Chance of showers
and thunderstorms. Patchy fog tonight. Waves 1 to 3 feet.

Superior North Central 14220 11226 11216 12226. Chance of showers
early this morning...then a chance of showers and thunderstorms
late today through tonight. Patchy fog tonight. Waves 1 to 3
feet.

Superior South Central 11320 11310 11210 11220 11210 11219 11216
11310. Chance of showers early this morning...then a chance of
showers and thunderstorms late today through the overnight hours.
Patchy fog tonight. Waves 1 to 2 feet.

Superior East 11320 12220 12210 11216 12226. Chance of showers
this morning...then a chance of showers and thunderstorms late
today through the overnight hours. Patchy fog tonight. 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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