Great Lakes Forecast
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FZUS63 KMQT 231957
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
357 PM EDT Sun Jul 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...Low pressure of 29.7 inches will move into the lower
Great Lakes through tonight. High pressure of 30.0 inches will build
into the Upper Great Lakes and persist through Tuesday. A low
pressure trough of 29.8 inches will then move across Lake Superior
Tuesday night and Wednesday. A 30.0 inch high pressure ridge will
then build back into the Upper Lakes on Thursday and persist into
Saturday.

LSZ162-240400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
357 PM EDT Sun Jul 23 2017 /257 PM CDT Sun Jul 23 2017/

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. Patchy
fog. Waves 1 to 3 feet.
.TONIGHT...Northeast winds 5 to 15 knots backing north after
midnight, then becoming west less than 10 knots late. Waves
subsiding to calm to 2 feet.
.MONDAY...Southwest winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then backing east late. Waves calm to
2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots veering south late.
Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots becoming southeast 5 to
15 knots by mid afternoon. 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...Southwest winds 5 to 15 knots veering west by mid
afternoon. A chance of showers and thunderstorms. Waves calm to
2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots becoming north 10 to
20 knots after midnight. Waves calm to 2 feet.
.THURSDAY...Northeast winds 5 to 15 knots backing north. Waves
calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-240400-
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-
357 PM EDT Sun Jul 23 2017

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. Patchy
fog. Waves 1 to 3 feet.
.TONIGHT...Northeast winds 5 to 15 knots becoming north 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 in the afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds less than 10 knots becoming southeast
5 to 15 knots after midnight, then veering south late. Waves calm
to 2 feet.
.TUESDAY...South winds 5 to 15 knots. A chance of showers and
thunderstorms by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. A chance of showers and thunderstorms. Waves
building to 1 to 3 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. A chance of showers and thunderstorms. Waves subsiding
to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.THURSDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY...Northeast winds less than 10 knots veering south. Waves
calm to 2 feet.

$$

LSZ264-240400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
357 PM EDT Sun Jul 23 2017

.LATE THIS AFTERNOON...Northeast winds 10 to 20 knots. Patchy
fog. Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...North winds 5 to 15 knots backing west after midnight,
then diminishing to less than 10 knots late. Waves calm to
2 feet.
.MONDAY...Southwest winds less than 10 knots increasing to 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds less than 10 knots increasing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing southeast by mid
afternoon. A slight chance of showers and thunderstorms by mid
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...South winds 5 to 15 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...Southwest winds 5 to 15 knots veering west by mid
afternoon. A chance of showers and thunderstorms. Waves building
to 2 to 4 feet, then subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots veering northeast.
Waves calm to 2 feet.
.FRIDAY...East winds less than 10 knots veering southwest. Waves
calm to 2 feet.

$$

LSZ265-240400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
357 PM EDT Sun Jul 23 2017

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. Patchy
fog. Isolated showers. Waves 3 to 5 feet occasionally to 7 feet
subsiding to 2 to 4 feet.
.TONIGHT...Northeast winds 5 to 15 knots backing northwest late.
Isolated showers through midnight. Waves subsiding to calm to
2 feet.
.MONDAY...Northwest winds 5 to 15 knots backing west in the
afternoon, then becoming southeast less than 10 knots late. Waves
calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots becoming south
10 to 20 knots late. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots becoming southwest
10 to 20 knots after midnight. A chance of showers and
thunderstorms. Waves 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots veering north
after midnight. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.

$$

LSZ266-240400-
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-
357 PM EDT Sun Jul 23 2017

.LATE THIS AFTERNOON...Northeast winds 15 to 25 knots. Patchy
fog. Isolated showers. Waves 3 to 5 feet occasionally to 7 feet
subsiding to 2 to 4 feet.
.TONIGHT...Northeast winds 10 to 20 knots becoming north 5 to
15 knots after midnight. Isolated showers through midnight. Waves
subsiding to calm to 2 feet.
.MONDAY...North winds 5 to 15 knots backing northwest in the
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 backing southeast by mid
afternoon. Waves building to 1 to 3 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.
.WEDNESDAY...Southwest winds 10 to 20 knots. Showers and
thunderstorms likely through early afternoon, then a chance of
showers and thunderstorms by mid afternoon. Waves subsiding to
1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots becoming north 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing northwest. Waves calm
to 2 feet.

$$

LSZ267-240400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
357 PM EDT Sun Jul 23 2017

.LATE THIS AFTERNOON...Northeast winds 20 to 30 knots. Patchy
fog. Scattered showers. Waves 2 to 4 feet subsiding to 1 to
3 feet.
.TONIGHT...Northeast winds 15 to 25 knots becoming north 10 to
20 knots after midnight. Isolated showers through midnight. Waves
subsiding to calm to 2 feet.
.MONDAY...North winds 5 to 15 knots becoming northwest 10 to
20 knots late. Waves calm to 2 feet.
.MONDAY NIGHT...Northwest winds 5 to 15 knots backing west after
midnight, then backing south late. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots. Showers and
thunderstorms likely after midnight. Waves building to 2 to
4 feet.
.WEDNESDAY...South winds 15 to 25 knots becoming southwest 10 to
20 knots by mid afternoon. Showers and thunderstorms through
early afternoon, then a chance of showers and thunderstorms by
mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. A chance of showers and thunderstorms through midnight.
Waves calm to 2 feet.
.THURSDAY...Northwest winds 10 to 20 knots veering northeast.
Waves building to 1 to 3 feet, then subsiding to calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing northwest. Waves calm
to 2 feet.

$$

LSZ261-240400-
MAFOR 2321/
Superior West 12120 11800 11700 11600 13500. Patchy fog early
this evening. Waves 1 to 3 feet.

Superior North Central 11120 11810 11700 13600 12500. Patchy fog
early this evening. Waves 1 to 3 feet.

Superior South Central 11130 11110 11810 11800 14700. Waves 1 to
4 feet.

Superior East 11130 11120 11820 14800 11700. Patchy fog early
this evening. Scattered showers early this evening. 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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