Great Lakes Forecast
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641
FZUS63 KMQT 231950
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
350 PM 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...A high pressure system of 30.2 inches over the Great
Lakes will shift eastward overnight leading to troughing averaging
29.8 inches from Thursday to Sunday. Ridging of 30.1 inches will
then build into the region early next week.

LSZ162-240400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
350 PM EDT Wed May 23 2018 /250 PM CDT Wed May 23 2018/

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast after
midnight, then becoming east less than 10 knots late. A chance of
rain showers and a slight chance of thunderstorms after midnight.
Waves calm to 2 feet.
.THURSDAY...East winds less than 10 knots increasing to 5 to
15 knots in the afternoon. A chance of rain showers. A chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots veering southwest
late. A chance of showers and thunderstorms. Waves calm to
2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. A chance of showers and
a slight chance of thunderstorms. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots veering north after
midnight. Patchy fog. A chance of showers. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. Patchy fog. A chance
of showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. Patchy fog. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.
.MONDAY...Northeast winds less than 10 knots becoming east 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-
350 PM EDT Wed May 23 2018

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots veering southeast after
midnight, then becoming south less than 10 knots late. A slight
chance of rain showers after midnight. Waves calm to 2 feet.
.THURSDAY...Southeast winds less than 10 knots increasing to 5 to
15 knots in the afternoon, then backing east late. A chance of
rain showers. A slight chance of thunderstorms by mid afternoon.
Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 5 to 15 knots veering southwest
late. A chance of showers and thunderstorms. Waves calm to
2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. A chance of showers and
a slight chance of thunderstorms. Waves calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots backing north after
midnight. 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.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. Patchy fog. A chance of rain showers. Waves calm
to 2 feet.
.SUNDAY...West winds less than 10 knots becoming northeast 5 to
15 knots. Waves calm to 2 feet.
.MONDAY...North winds less than 10 knots becoming east 5 to
15 knots. 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-
350 PM EDT Wed May 23 2018

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east late. Waves
calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots backing southeast in the
afternoon. A slight chance of rain showers. A slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.THURSDAY NIGHT...South winds 10 to 20 knots veering southwest
after midnight. A chance of showers through midnight. A chance of
thunderstorms. Showers likely after midnight. Waves calm to
2 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming south 5 to
15 knots by mid afternoon. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 10 to 20 knots becoming east 5 to
15 knots after midnight. Patchy fog. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.SATURDAY...Northeast winds 10 to 20 knots. Patchy fog. A chance
of rain showers. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots veering southeast
after midnight. Patchy fog. A chance of rain showers. Waves calm
to 2 feet.
.SUNDAY...West winds 5 to 15 knots veering northwest. A chance of
rain showers. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing east. Waves calm to
2 feet.

$$

LSZ265-240400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
350 PM EDT Wed May 23 2018

.LATE THIS AFTERNOON...East winds 5 to 15 knots. 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 backing southeast in the
afternoon, then increasing to 10 to 20 knots late. A chance of
showers. A slight chance of thunderstorms by mid 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 a slight
chance of thunderstorms. Waves calm to 2 feet.
.FRIDAY...South winds 10 to 20 knots becoming southeast 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 west after
midnight. Patchy fog. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Patchy fog. A chance of rain showers.
Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Patchy fog. A chance of rain showers. Waves calm to
2 feet.
.SUNDAY...Northeast winds 5 to 15 knots backing northwest. A
chance of rain showers. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots veering east. 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-
350 PM EDT Wed May 23 2018

.LATE THIS AFTERNOON...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. 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 showers
and 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...Southeast winds 5 to 15 knots veering south after
midnight. Patchy fog. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. Patchy fog. A chance of rain showers.
Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots becoming southeast
10 to 20 knots after midnight. Patchy fog. A chance of rain
showers. Waves calm to 2 feet.
.SUNDAY...South winds 10 to 20 knots becoming northwest 5 to
15 knots. A chance of rain showers. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots veering northeast. 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-
350 PM EDT Wed May 23 2018

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds less than 10 knots becoming south 5 to
15 knots after midnight, then increasing to 10 to 20 knots late.
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 increasing to 15 to
25 knots after midnight, then diminishing to 10 to 20 knots late.
A chance of showers and a slight chance of thunderstorms. Waves
building to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots backing southeast by mid
afternoon. A chance of showers and thunderstorms. Waves subsiding
to calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots backing southeast 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 10 to 20 knots. Patchy fog. A chance of
showers. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 10 to 20 knots veering southeast
after midnight. Patchy fog. A chance of rain showers. Waves calm
to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots veering northwest. A
chance of rain showers. Waves calm to 2 feet.
.MONDAY...Northwest winds 10 to 20 knots veering northeast. Waves
calm to 2 feet.

$$

LSZ261-240400-
MAFOR 2321/
Superior West 12200 12100 12300 12200. Chance of showers through
early afternoon Thursday. Waves around 1 foot.

Superior North Central 14300 11300 12400 11300. Waves 2 feet or
less.

Superior South Central 11200 12300 11400 12500 11400 11310.
Chance of showers late Thursday. Waves 1 foot or less.

Superior East 12200 12300 14400. Waves 2 feet or less.

$$

KCW

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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