Great Lakes Forecast
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FZUS63 KMQT 242003
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
403 PM EDT Mon Jul 24 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...High pressure of 30.0 inches moving over the Upper Great
Lakes will 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 Great Lakes on Thursday and persist through the
weekend.

LSZ162-250415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
403 PM EDT Mon Jul 24 2017 /303 PM CDT Mon Jul 24 2017/

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots becoming northeast less than
10 knots after midnight, then becoming south 5 to 15 knots late.
Patchy fog. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing east in the
afternoon, then veering southeast late. A chance of showers. A
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...South winds 5 to 15 knots becoming southwest
10 to 20 knots after midnight. A chance of showers and a slight
chance of thunderstorms. Waves calm to 2 feet.
.WEDNESDAY...West winds 10 to 20 knots. A slight chance of
showers through early afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots veering north
after midnight. Waves calm to 2 feet.
.THURSDAY...North winds 5 to 15 knots veering south by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.

$$

LSZ263-250415-
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 Mon Jul 24 2017

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

$$

LSZ264-250415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
403 PM EDT Mon Jul 24 2017

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

$$

LSZ265-250415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
403 PM EDT Mon Jul 24 2017

.LATE THIS AFTERNOON...East winds less than 10 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south late.
Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. Waves building
to 1 to 3 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots veering southwest
late. A slight chance of showers through midnight. A chance of
thunderstorms. Showers likely after midnight. Waves 1 to 3 feet.
.WEDNESDAY...West winds 10 to 20 knots. A slight chance of
thunderstorms through early afternoon. A chance of showers. Waves
subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 10 to 20 knots veering northwest
after midnight. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots becoming north
5 to 15 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots backing west. Waves calm
to 2 feet.
.SATURDAY...East winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ266-250415-
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 Mon Jul 24 2017

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...Southeast winds less than 10 knots increasing to 5 to
15 knots after midnight, then veering south late. Patchy fog
through midnight. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. Waves building
to 1 to 3 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots increasing to 20 to
30 knots after midnight, then diminishing to 15 to 25 knots late.
A slight chance of showers through midnight. A chance of
thunderstorms. Showers likely after midnight. Waves building to
2 to 4 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. A slight chance of thunderstorms
through early afternoon. A chance of showers. Waves subsiding to
1 to 3 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots backing north. Waves calm
to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.

$$

LSZ267-250415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
403 PM EDT Mon Jul 24 2017

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing south after midnight,
then diminishing to less than 10 knots late. Waves calm to
2 feet.
.TUESDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots. A slight chance of
showers through midnight, then showers likely and a slight chance
of thunderstorms after midnight. Waves building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots by mid afternoon. Showers likely and a slight chance of
thunderstorms through early afternoon, then a chance of showers
by mid afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves calm to 2 feet.
.FRIDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots backing south. Waves
calm to 2 feet.

$$

LSZ261-250415-
MAFOR 2421/
Superior West 11400 11300 11200 11300 12400 12300. Patchy fog
tonight. Waves 2 feet or less.

Superior North Central 11510 11500 11400 11310 11410 11400 11410
11310. Patchy fog tonight. Waves 1 to 3 feet.

Superior South Central 11200 13300 12410 12310. Waves 2 feet or
less.

Superior East 12700 11500 13400 11300 11310. Waves around 1 foot.

$$

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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