Great Lakes Forecast
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975
FZUS63 KMQT 222009
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
409 PM 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 through tonight. 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.

LSZ162-230415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
409 PM EDT Sat Jul 22 2017 /309 PM CDT Sat Jul 22 2017/

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Patchy fog.
Scattered showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots becoming northwest less
than 10 knots after midnight, then becoming west 5 to 15 knots
late. Areas of fog. Scattered thunderstorms through midnight.
Scattered showers. Waves calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots becoming northeast 10 to
20 knots in the afternoon. Isolated showers through early
afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots backing northwest
after midnight, then backing west late. Waves subsiding to calm
to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots. A chance of showers. A
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.

$$

LSZ263-230415-
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 PM EDT Sat Jul 22 2017

.LATE THIS AFTERNOON...Northeast winds 5 to 15 knots. Patchy fog.
Scattered showers and thunderstorms. Waves 1 to 3 feet.
.TONIGHT...Northeast winds 5 to 15 knots backing northwest late.
Areas of fog. Scattered showers and thunderstorms. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.SUNDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Patchy fog through early afternoon.
Scattered 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 becoming northwest
less than 10 knots after midnight, then backing west late. Waves
subsiding to 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...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY NIGHT...Southwest winds 10 to 20 knots. A chance of
showers and thunderstorms. Waves building to 1 to 3 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
subsiding to calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.

$$

LSZ264-230415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
409 PM EDT Sat Jul 22 2017

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy fog.
Scattered showers and thunderstorms. Waves 1 to 3 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast late. Areas
of fog. Numerous showers and scattered thunderstorms. Waves
subsiding to calm to 2 feet, then building to 1 to 3 feet.
.SUNDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon. Patchy fog. Isolated thunderstorms
through early afternoon. Scattered showers. Waves 1 to 3 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots becoming west less
than 10 knots late. 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 5 to 15 knots. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers and thunderstorms. Waves 1 to
3 feet.
.WEDNESDAY...West winds 5 to 15 knots veering northwest. Waves
subsiding to calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing west. Waves
calm to 2 feet.

$$

LSZ265-230415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
409 PM EDT Sat Jul 22 2017

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Patchy fog.
Scattered showers and thunderstorms. Waves calm to 2 feet
building to 1 to 3 feet.
.TONIGHT...East winds 5 to 15 knots veering west late. Areas of
fog. Scattered showers and thunderstorms. Waves subsiding to calm
to 2 feet, then building to 1 to 3 feet.
.SUNDAY...Northeast winds 10 to 20 knots becoming east 15 to
25 knots in the afternoon, then becoming northeast 10 to 20 knots
late. Patchy fog through early afternoon. Isolated thunderstorms
through early afternoon. Scattered showers. Waves building to
2 to 4 feet, then subsiding to 1 to 3 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then becoming northwest 10 to 20 knots
late. 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. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of showers and thunderstorms. Waves calm
to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ266-230415-
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 PM EDT Sat Jul 22 2017

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Patchy fog.
Scattered showers and thunderstorms. Waves calm to 2 feet
building to 1 to 3 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 10 to 20 knots
late. Areas of fog. Scattered showers through midnight. Scattered
thunderstorms. Numerous showers after midnight. Waves subsiding
to calm to 2 feet, then building to 2 to 4 feet.
.SUNDAY...East winds 10 to 20 knots backing northeast late. Areas
of fog. Isolated thunderstorms through early afternoon. Scattered
showers. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.SUNDAY NIGHT...North winds 10 to 20 knots. 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. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots veering southwest
after midnight. A chance of showers and thunderstorms. Waves
building to 2 to 4 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves subsiding to calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ267-230415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
409 PM EDT Sat Jul 22 2017

.LATE THIS AFTERNOON...East winds 10 to 20 knots. Isolated
showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...East winds 10 to 20 knots. Scattered showers through
midnight. Scattered thunderstorms. Numerous showers after
midnight. Patchy fog after midnight. Waves building to 1 to
3 feet.
.SUNDAY...East winds 15 to 25 knots becoming northeast 10 to
20 knots late. Patchy fog through early afternoon. Numerous
showers through early afternoon, then scattered showers by mid
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight. A chance of showers through 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 becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots. A chance of showers
and thunderstorms through midnight, then showers and
thunderstorms likely after midnight. 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. A chance of showers and thunderstorms. Waves subsiding
to calm to 2 feet, then building to 1 to 3 feet.
.THURSDAY...Northwest winds 5 to 15 knots veering north. Waves
calm to 2 feet.

$$

LSZ261-230415-
MAFOR 2221/
Superior West 12110 11803 11703 11700 11710 11820 11120. Patchy
fog through early evening. Scattered showers and thunderstorms
through the early tonight. Scattered showers late tonight through
late Sunday morning. Waves 1 to 2 feet.

Superior North Central 11210 14216 12123 11110. Patchy fog this
evening through early Sunday afternoon. Scattered showers and
thunderstorms early this evening through Sunday morning.
Scattered showers early Sunday afternoon. Waves 2 to 3 feet.

Superior South Central 12210 11213 11316 11210 11120 11130 11230.
Patchy fog this evening through early Sunday afternoon. Scattered
showers and thunderstorms early tonight through mid Sunday
morning. Scattered showers late Sunday morning. Waves 1 to 3
feet.

Superior East 13210 11216 13226 11220. Patchy fog overnight
through Sunday morning. Scattered showers and thunderstorms early
tonight through late tonight. Scattered showers late Sunday
afternoon. 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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