Great Lakes Forecast
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FZUS63 KMQT 230759
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
359 AM EDT Wed May 23 2018

For waters beyond 5 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 30.1 inches over southern Lower
Michigan will drift toward the lower Great Lakes and Mid-Atlantic
States on Thursday as one low pressure trough of 29.7 inches
drops across far northern Ontario and a second trough of 29.6
inches emerges across the Canadian Prairies. The plains trough
will approach the western Great Lakes on Friday, then weaken over
that area on Saturday to 29.8 inches. This disorganized troughing
will remain over the Upper Great Lakes Sunday.

LSZ162-231600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
359 AM EDT Wed May 23 2018 /259 AM CDT Wed May 23 2018/

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southwest winds 5 to 15 knots becoming east less than
10 knots in the afternoon, then increasing to 5 to 15 knots late.
Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight. A chance of showers and thunderstorms. Waves calm to 2
feet.
.THURSDAY...Northeast winds 5 to 15 knots. A chance of showers
and thunderstorms. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots. A chance of showers
and thunderstorms. Waves calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots veering southwest by mid
afternoon. A chance of showers and thunderstorms. Waves calm to
2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots. Patchy fog. A
chance of showers. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. Patchy fog. A chance
of rain showers. Waves calm to 2 feet.
.SUNDAY...East winds less than 10 knots backing northeast. Waves
calm to 2 feet.

$$

LSZ263-231600-
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-
359 AM EDT Wed May 23 2018

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...West winds 5 to 15 knots veering north in the afternoon,
then veering northeast late. Waves calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south late. A slight
chance of showers and thunderstorms after midnight. Waves calm to
2 feet.
.THURSDAY...Southeast winds 5 to 15 knots backing east late. A
chance of showers and thunderstorms. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots veering southwest
after midnight. A chance of showers and thunderstorms. Waves calm
to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. A chance of showers.
Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots. Patchy fog. A
chance of showers and thunderstorms. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. Patchy fog. A chance
of rain showers. Waves calm to 2 feet.
.SUNDAY...North winds less than 10 knots becoming west 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ264-231600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
359 AM EDT Wed May 23 2018

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southeast winds 5 to 15 knots backing east in the
afternoon. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast in the
afternoon, then increasing to 10 to 20 knots late. A chance of
showers and thunderstorms through early afternoon. Waves calm to
2 feet.
.THURSDAY 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.
.FRIDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. A chance of showers and thunderstorms. Waves
calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots backing east after
midnight. Patchy fog. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing northeast. Patchy
fog. A chance of thunderstorms. A chance of rain showers. Waves
calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west. A chance of
rain showers. Waves calm to 2 feet.

$$

LSZ265-231600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
359 AM EDT Wed May 23 2018

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots backing east in the afternoon.
Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering southwest late.
Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon. A slight chance of showers and
thunderstorms. Waves calm to 2 feet.
.THURSDAY 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.
.FRIDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. A chance of showers and thunderstorms. Waves
calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Patchy fog. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Patchy fog. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.

$$

LSZ266-231600-
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-
359 AM EDT Wed May 23 2018

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Southeast winds 5 to 15 knots backing east in the
afternoon. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. A slight chance of showers
and thunderstorms by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. A chance of rain
showers and a slight chance of thunderstorms. Waves building to
1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. A chance of showers and thunderstorms. Waves
subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots becoming southwest
5 to 15 knots after midnight. Patchy fog. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering southeast. Patchy
fog. A chance of showers and thunderstorms. Waves calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-231600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
359 AM EDT Wed May 23 2018

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots. A chance of showers
and a slight chance of thunderstorms. Waves building to 1 to
3 feet.
.FRIDAY...South winds 10 to 20 knots. A chance of showers. A
chance of thunderstorms by mid afternoon. Waves subsiding to calm
to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Patchy fog. Showers likely through
midnight. A chance of thunderstorms. A chance of showers after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots veering southeast. Patchy
fog. A chance of showers and thunderstorms. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots veering northwest. A chance
of rain showers. Waves calm to 2 feet.

$$

LSZ261-231600-
MAFOR 2309/
Superior West 11510 12500 13200 12100. Waves 1 to 2 feet.

Superior North Central 12300 12200 12300 12400. Waves 2 feet or
less.

Superior South Central 11300 11400 13200 12300 11400. Waves 1
foot or less.

Superior East 11800 14200 11300 12400. Waves 1 foot or less.

$$

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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