Great Lakes Forecast
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FZUS63 KMQT 240810
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
410 AM 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 into the Upper
Great Lakes from the northern Plains 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 into Saturday.

LSZ162-241615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
410 AM EDT Mon Jul 24 2017 /310 AM CDT Mon Jul 24 2017/

.EARLY THIS MORNING...Variable winds 10 knots or less. Patchy
fog. Waves calm to 2 feet.
.TODAY...Southwest winds 5 to 15 knots backing east late. Waves
building to 1 to 3 feet, then subsiding to calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight, then veering south late. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon, then becoming southeast 5 to 15 knots late. A
chance of showers. A slight 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
thunderstorms. Waves calm to 2 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots veering west by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...East winds 5 to 15 knots veering west. Waves calm to
2 feet.
.FRIDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-241615-
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-
410 AM EDT Mon Jul 24 2017

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TODAY...Southwest winds 5 to 15 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south late. Waves
calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots. A chance of showers and a
slight 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
thunderstorms. Waves building to 1 to 3 feet.
.WEDNESDAY...Southwest winds 5 to 15 knots. A chance of showers.
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 5 to 15 knots backing west. Waves calm to
2 feet.
.FRIDAY...Northeast winds less than 10 knots veering south. Waves
calm to 2 feet.

$$

LSZ264-241615-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
410 AM EDT Mon Jul 24 2017

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots late. 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
after midnight. A chance of showers and thunderstorms. Waves
building to 2 to 4 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid 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 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.

$$

LSZ265-241615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
410 AM EDT Mon Jul 24 2017

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves 1 to 2
feet.
.TODAY...West winds 5 to 15 knots backing south in the afternoon,
then backing southeast late. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then 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
after midnight. A chance of showers through midnight. A chance of
thunderstorms. Showers likely after midnight. Waves 1 to 3 feet.
.WEDNESDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots 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 northwest
after midnight. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots backing west. Waves calm
to 2 feet.

$$

LSZ266-241615-
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-
410 AM EDT Mon Jul 24 2017

.EARLY THIS MORNING...North winds 5 to 15 knots. Waves 1 to 2
feet.
.TODAY...North winds 5 to 15 knots backing west late. Waves calm
to 2 feet.
.TONIGHT...South winds 5 to 15 knots increasing to 10 to 20 knots
late. Waves calm to 2 feet.
.TUESDAY...South winds 10 to 20 knots diminishing to 5 to
15 knots in the afternoon, then becoming southeast 10 to 20 knots
late. Waves building to 1 to 3 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots. A 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. Showers likely through early
afternoon. A chance of thunderstorms. A chance of showers by mid
afternoon. 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. Waves calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots backing northwest. Waves calm
to 2 feet.

$$

LSZ267-241615-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
410 AM EDT Mon Jul 24 2017

.EARLY THIS MORNING...North winds 10 to 20 knots. Waves 1 to 2
feet.
.TODAY...North winds 10 to 20 knots backing northwest in the
afternoon. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing south after 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 calm to
2 feet.
.TUESDAY NIGHT...South winds 15 to 25 knots. A slight chance of
showers through midnight, then showers likely and a 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. Thunderstorms likely through early
afternoon. Showers likely. A chance of thunderstorms by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots veering northwest
after midnight. A chance of showers. Waves calm to 2 feet.
.THURSDAY...North winds 10 to 20 knots becoming northeast 5 to
15 knots. Waves calm to 2 feet.
.FRIDAY...North winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ261-241615-
MAFOR 2409/
Superior West 14500 11400 11200 12310. Waves 2 feet or less.

Superior North Central 12610 13510 13410. Waves 1 to 3 feet.

Superior South Central 11700 12710 11200 12300 12310. Waves 2
feet or less.

Superior East 12810 11800 12710 11600 11500 11400. Waves 1 to 2
feet.

$$

JLA

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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