Great Lakes Forecast
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FZUS63 KMQT 240802
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
402 AM EDT Thu May 24 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 30.2 inches over the lower Great
Lakes will slide off the east coast on Friday as low pressure of
29.6 inches expands from the Canadian prairies to the western
Great Lakes. Expect the low pressure trough to diminish to 29.9
inches by Monday as it moves to the lower Great Lakes. High
pressure of 30.1 inches will then build across northern Ontario
and the upper Great Lakes by late Monday.

LSZ162-241615-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
402 AM EDT Thu May 24 2018 /302 AM CDT Thu May 24 2018/

.EARLY THIS MORNING...Southeast winds 5 to 15 knots. A slight
chance of showers and thunderstorms. Waves calm to 2 feet.
.TODAY...East winds 5 to 15 knots. A chance of rain showers and a
slight chance of thunderstorms. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.
.TONIGHT...East winds 5 to 15 knots veering south after midnight.
A chance of showers and thunderstorms. Waves calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. Patchy fog. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. Areas of fog. A chance
of showers and thunderstorms. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. Areas of fog. A chance
of rain showers. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots diminishing to
less than 10 knots after midnight. Patchy fog. Waves subsiding to
calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots backing northeast. Patchy fog.
Waves calm to 2 feet.
.MONDAY...East winds less than 10 knots becoming northeast 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-
402 AM EDT Thu May 24 2018

.EARLY THIS MORNING...Northeast winds less than 10 knots becoming
south winds 5 to 15 knots. A slight chance of rain showers. Waves
calm to 2 feet.
.TODAY...South winds 5 to 15 knots backing southeast late. A
chance of rain showers and a slight chance of thunderstorms.
Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight. A chance of showers and thunderstorms. Waves building
to 1 to 3 feet, then subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 5 to 15 knots. Patchy fog. A slight
chance of showers and thunderstorms. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots backing northeast
after midnight. Areas of fog. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. Areas of fog. A chance
of rain showers. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots diminishing to
less than 10 knots after midnight. Patchy fog. Waves subsiding to
calm to 2 feet.
.SUNDAY...Northeast winds less than 10 knots. Patchy fog. Waves
calm to 2 feet.
.MONDAY...West winds less than 10 knots becoming northeast 5 to
15 knots. 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-
402 AM EDT Thu May 24 2018

.EARLY THIS MORNING...Northeast winds less than 10 knots becoming
southeast winds 5 to 15 knots. Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots. A slight chance of showers
and thunderstorms. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight. A chance of showers and thunderstorms. Patchy fog after
midnight. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing south late.
Areas of fog. A chance of showers and thunderstorms. Waves calm
to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots backing east after
midnight. Areas of 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. Areas of fog. A chance of rain
showers. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots. Patchy fog. A chance
of rain showers. Waves subsiding to calm to 2 feet.
.SUNDAY...North winds 5 to 15 knots backing northwest. Patchy
fog. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots veering northeast. Waves calm
to 2 feet.

$$

LSZ265-241615-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
402 AM EDT Thu May 24 2018

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to 2
feet.
.TODAY...South winds 5 to 15 knots becoming southeast 10 to 20
knots late. A chance of showers and a slight chance of thunderstorms.
Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots veering southwest after
midnight. A chance of showers and thunderstorms. Waves building
to 1 to 3 feet, then subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots backing south in the
afternoon, then becoming southeast 5 to 15 knots late. A chance
of showers and thunderstorms. Patchy fog by mid afternoon. Waves
calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots backing northeast
after midnight. Areas of fog. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering northeast by mid
afternoon. Areas of fog. A chance of rain showers. Waves calm to
2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots. Patchy fog. A chance
of rain showers. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots backing northwest. Patchy
fog. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots veering east. 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-
402 AM EDT Thu May 24 2018

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to 2
feet.
.TODAY...South winds 5 to 15 knots increasing to 10 to 20 knots
late. A slight chance of showers and thunderstorms by mid
afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots. A chance of showers and
thunderstorms. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots backing southeast late.
Patchy fog. A chance of showers and thunderstorms. Waves
subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots backing east after
midnight. Areas of fog. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots. Areas of fog. A chance of
rain showers. Waves building to 1 to 3 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 subsiding to calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots veering northwest. Patchy
fog. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots veering northeast. 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-
402 AM EDT Thu May 24 2018

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves calm to 2
feet.
.TODAY...South winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...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 thunderstorms. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots backing southeast late.
Patchy fog. A chance of showers and thunderstorms. Waves
subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southeast winds 5 to 15 knots backing east after
midnight. Areas of 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. Areas of fog. A chance of
showers. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots. Patchy fog. A
chance of showers. Waves calm to 2 feet.
.SUNDAY...Southeast winds 10 to 20 knots becoming west 5 to
15 knots. Patchy fog. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots veering north. Waves calm to
2 feet.

$$

LSZ261-241615-
MAFOR 2409/
Superior West 13300 11200 11210 11310 12410. Chance of showers
and thunderstorms. Waves 1 to 2 feet.

Superior North Central 11310 11400 11500 11400 11310 12410 11510.
Patchy fog late. Chance of showers and thunderstorms tonight.
Waves 1 to 3 feet.

Superior South Central 12500 11400 12310 12420 11520. Chance of
showers and thunderstorms late today, then again overnight tonight.
Waves 2 feet or less today. Waves 1 to 3 feet tonight.

Superior East 11300 13400 11310 12420 11520. Chance of showers
and thunderstorms from late evening on tonight. Waves 1 to 2 feet
today. Waves 1 to 3 feet building to 2 to 4 feet tonight.

$$

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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