Great Lakes Forecast
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181
FZUS63 KMQT 212003
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
403 PM EDT Fri Jul 21 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 29.9 inch ridge remains over the Upper Great Lakes
tonight while a low pressure system of 29.6 inches develops over
the Plains. This low will track to the Upper Mississippi Valley by
Saturday night and will then move south across Wisconsin and into
Lower Michigan. Sunday into Monday, a 30.0 inch high will start
to build 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 of 29.8 inches that will push
across the Upper Great Lakes by Tuesday night. A 29.9 inch ridge
moves over the Upper Great Lakes on Wednesday.

LSZ162-220415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
403 PM EDT Fri Jul 21 2017 /303 PM CDT Fri Jul 21 2017/

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet building to 1 to 3 feet.
.TONIGHT...Northeast winds 10 to 20 knots. Patchy fog after
midnight. Isolated showers after midnight. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.SATURDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots late. Patchy fog through early afternoon. Scattered
showers and thunderstorms. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north
late. A slight chance of thunderstorms through midnight. A chance
of showers. Waves calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots veering northeast by mid
afternoon. A chance of showers through early afternoon. Waves
building to 1 to 3 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves subsiding to 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...South winds 10 to 20 knots veering west. A chance of
showers. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
calm to 2 feet.

$$

LSZ263-220415-
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-
403 PM EDT Fri Jul 21 2017

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...East winds 10 to 20 knots diminishing to 5 to 15 knots
late. Patchy fog after midnight. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing northeast in the
afternoon. Scattered showers and thunderstorms. Waves building to
1 to 3 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north
late. Showers likely and a chance of thunderstorms through
midnight, then a chance of showers after midnight. Waves
subsiding to calm to 2 feet.
.SUNDAY...North winds 10 to 20 knots veering northeast by mid
afternoon. A chance of showers. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots becoming west less
than 10 knots after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds less than 10 knots backing south 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 5 to 15 knots veering west. A chance of
showers. Waves calm to 2 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-220415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
403 PM EDT Fri Jul 21 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots. Isolated showers. Waves calm
to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Isolated showers through
early afternoon. Scattered thunderstorms. Numerous showers by mid
afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots backing northeast
late. Showers likely and a slight chance of thunderstorms. Waves
subsiding to calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots. A chance of showers.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 2 to 4 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots backing northwest
after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds less than 10 knots backing south by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots veering west. A chance of
showers. Waves building to 1 to 3 feet.
.WEDNESDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.

$$

LSZ265-220415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
403 PM EDT Fri Jul 21 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Isolated
showers. Waves calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots. Isolated showers. Waves
calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots. Scattered showers and
thunderstorms. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots backing northwest
late. A slight chance of thunderstorms through midnight. Showers
likely. Waves calm to 2 feet.
.SUNDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots by mid afternoon. A chance of showers. Waves building to
2 to 4 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...North 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. Waves
calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.

$$

LSZ266-220415-
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-
403 PM EDT Fri Jul 21 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Isolated
showers. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
after midnight. Isolated showers. Patchy fog after midnight.
Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Scattered showers and thunderstorms. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots. Showers likely and a
slight chance of thunderstorms. Waves calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots becoming northeast 15 to
25 knots by mid afternoon. A chance of showers. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots. Waves subsiding to
1 to 3 feet.
.MONDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves subsiding to 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 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves subsiding to calm
to 2 feet.

$$

LSZ267-220415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
403 PM EDT Fri Jul 21 2017

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds less than 10 knots increasing to 10 to
20 knots. Isolated showers. Patchy fog after midnight. Waves calm
to 2 feet.
.SATURDAY...East winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Scattered showers and thunderstorms by
mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots veering southeast
late. A chance of showers and a slight chance of thunderstorms
through midnight, then showers after midnight. Waves calm to
2 feet.
.SUNDAY...East winds 10 to 20 knots backing northeast by mid
afternoon. Showers likely through early afternoon, then a chance
of showers by mid afternoon. Waves building to 2 to 4 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...North winds 10 to 20 knots backing northwest 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 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ261-220415-
MAFOR 2121/
Superior West 12220 12130 11120 13110. Patchy fog late tonight
through late Saturday morning. Scattered showers and
thunderstorms on Saturday. Waves 1 to 3 feet.

Superior North Central 11200 11210 11310 14210 11210. Scattered
showers and thunderstorms late Saturday morning. Waves 1 to 3
feet.

Superior South Central 11200 11310 15210. Scattered showers after
midnight tonight. Scattered showers and thunderstorms late
Saturday morning. Waves 1 to 3 feet.

Superior East 11100 11200 15210. Patchy fog through mid morning
Saturday. Waves 1 to 3 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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