Great Lakes Forecast
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733
FZUS63 KMQT 250747
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
347 AM EDT Fri May 25 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...Low pressure of 29.6 inches will expand from the
Canadian prairies to the western Great Lakes today and tonight.
Expect the low pressure trough to linger across the Great Lakes
through the weekend. However it will weaken 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. By Tuesday, the 30.1 inch high
will move over Quebec.

LSZ162-251600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
347 AM EDT Fri May 25 2018 /247 AM CDT Fri May 25 2018/

...DENSE FOG ADVISORY IN EFFECT UNTIL 11 AM EDT /10 AM CDT/ THIS
MORNING...

.EARLY THIS MORNING...Southwest winds less than 10 knots. Patchy
dense fog. A chance of showers and a slight chance of
thunderstorms. Waves calm to 2 feet.
.TODAY...Southwest winds 5 to 15 knots. Patchy fog. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Patchy fog through
midnight. Widespread fog after midnight. A slight chance of
thunderstorms through midnight. A slight chance of rain showers.
Waves calm to 2 feet.
.SATURDAY...East winds less than 10 knots becoming northeast 5 to
15 knots in the afternoon. Areas of fog. A chance of showers. A
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots becoming west
less than 10 knots after midnight. Patchy fog. A slight chance of
thunderstorms through midnight. A slight chance of rain showers.
Waves calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Patchy fog. Waves calm
to 2 feet.
.SUNDAY NIGHT...West winds less than 10 knots. Waves calm to
2 feet.
.MONDAY...East winds less than 10 knots increasing to 5 to
15 knots. A chance of showers. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.

$$

LSZ263-251600-
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-
347 AM EDT Fri May 25 2018

.EARLY THIS MORNING...Southwest winds 5 to 15 knots. Patchy fog.
A slight chance of showers and thunderstorms. Waves calm to
2 feet.
.TODAY...Southwest winds 5 to 15 knots. Patchy fog. A chance of
showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots. Areas of fog through
midnight. Widespread fog after midnight. A chance of
thunderstorms through midnight. A chance of rain showers. Waves
calm to 2 feet.
.SATURDAY...Northeast winds less than 10 knots increasing to 5 to
15 knots in the afternoon. Areas of fog. A chance of showers. A
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots becoming west
less than 10 knots after midnight. Patchy fog. A slight chance of
thunderstorms through midnight. A chance of rain showers. Waves
calm to 2 feet.
.SUNDAY...Southwest winds 5 to 15 knots. Patchy fog. Waves calm
to 2 feet.
.SUNDAY NIGHT...Southwest winds less than 10 knots. Waves calm to
2 feet.
.MONDAY...Northeast winds less than 10 knots becoming east 5 to
15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots veering south. Waves building
to 1 to 3 feet.

$$

LSZ264-251600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
347 AM EDT Fri May 25 2018

.EARLY THIS MORNING...East winds 5 to 15 knots. Patchy fog. A
chance of showers and a slight chance of thunderstorms. Waves
calm to 2 feet.
.TODAY...South winds 5 to 15 knots increasing to 10 to 20 knots
late. Patchy fog. A chance of showers and thunderstorms. Waves
calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots veering southwest after
midnight, then backing northeast late. Widespread fog. A chance
of showers and thunderstorms. Waves calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots veering east in the
afternoon, then increasing to 10 to 20 knots late. Widespread fog
through early afternoon. Areas of fog by mid afternoon. A chance
of rain showers. A slight chance of thunderstorms by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering west after
midnight. Patchy fog. A slight chance of thunderstorms through
midnight. A chance of rain showers. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Patchy fog. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.TUESDAY...East winds 10 to 20 knots veering southeast. Waves
building to 2 to 4 feet.

$$

LSZ265-251600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
347 AM EDT Fri May 25 2018

.EARLY THIS MORNING...South winds 5 to 15 knots. Patchy fog. A
chance of showers and thunderstorms. Waves calm to 2 feet.
.TODAY...Southwest winds 5 to 15 knots backing southeast in the
afternoon, then becoming south 10 to 20 knots late. Patchy fog. A
chance of showers and thunderstorms. Waves calm to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Patchy fog through midnight. Widespread
fog after midnight. A chance of showers and thunderstorms. Waves
calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
late. Areas of fog. A chance of showers. A chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering west after
midnight. Patchy fog. A slight chance of thunderstorms through
midnight. A chance of showers. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots veering north by mid
afternoon. Patchy fog. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots becoming south 10 to
20 knots. Waves building to 1 to 3 feet.

$$

LSZ266-251600-
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-
347 AM EDT Fri May 25 2018

.EARLY THIS MORNING...South winds 5 to 15 knots. Patchy fog. A
chance of showers and thunderstorms. Waves calm to 2 feet.
.TODAY...South winds 5 to 15 knots increasing to 10 to 20 knots
late. Patchy fog. A chance of showers and thunderstorms. Waves
calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots late. Patchy fog through midnight. Widespread fog after
midnight. A chance of showers and thunderstorms. Waves calm to
2 feet.
.SATURDAY...South winds 5 to 15 knots backing east in the
afternoon, then increasing to 10 to 20 knots late. Areas of fog.
A chance of showers. A chance of thunderstorms by mid afternoon.
Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Patchy fog. A slight chance of thunderstorms through
midnight. A chance of rain showers. Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots veering northwest by mid
afternoon. Patchy fog. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering east. Waves calm to
2 feet.
.TUESDAY...East winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves building to 2 to 4 feet.

$$

LSZ267-251600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
347 AM EDT Fri May 25 2018

.EARLY THIS MORNING...Southeast winds 10 to 20 knots. Patchy fog.
Showers likely and a slight chance of thunderstorms. Waves calm
to 2 feet.
.TODAY...South winds 10 to 20 knots becoming southwest 5 to
15 knots in the afternoon, then becoming southeast 10 to 20 knots
late. Patchy fog. A chance of showers through early afternoon. A
chance of thunderstorms. Showers likely by mid afternoon. Waves
calm to 2 feet.
.TONIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots late. Widespread fog. A chance of showers and
thunderstorms. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots late. Widespread fog through early afternoon. Areas of
fog by mid afternoon. A chance of showers and thunderstorms.
Waves calm to 2 feet.
.SATURDAY NIGHT...East winds 5 to 15 knots veering south after
midnight. Patchy fog. A slight chance of thunderstorms through
midnight. A chance of showers. Waves calm to 2 feet.
.SUNDAY...South winds 5 to 15 knots veering west by mid
afternoon. Patchy fog. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering east. Waves calm to
2 feet.
.TUESDAY...Southeast winds 10 to 20 knots. Waves building to 1 to
3 feet.

$$

LSZ261-251600-
MAFOR 2509/

Superior West...Dense Fog Advisory in effect...13500 14510 11503.
Patchy dense fog this morning, then patchy fog through early
evening. Chance of showers and thunderstorms. Waves 2 feet or
less.

Superior North Central 11300 12400 12410 11400 12503. Patchy fog.
Chance of showers and thunderstorms today. Waves 1 foot or less.

Superior South Central 11400 11500 11400 11310 11410 11516 11513
11503. Patchy fog. Chance of showers and thunderstorms. Waves 2
feet or less.

Superior East 11306 11400 11500 11416 11316 11416 11423 11413.
Patchy fog. Chance of showers and thunderstorms. Waves 1 to 2
feet.

$$

Ritzman

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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