434
FZUS63 KMQT 041943
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
343 PM EDT Thu Jul 4 2024

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... As a weak 29.9 inch high pressure ridge over the
Upper Mississippi Valley has settled over the western Great Lakes
this afternoon, a 29.8 inch low pressure will gradually begin to
organize over Iowa and southern Minnesota. This low will deepen to
29.7 inches as it tracks east, passing across Wisconsin late
tonight and Friday morning, Lower Michigan on Friday afternoon,
then reaching southern Quebec by Saturday afternoon. In its wake,
another weak high pressure ridge of 29.9 inches will shift east,
reaching the western Great Lakes during Saturday. As the ridge
builds to 30.1 inches while shifting to the Lower Great Lakes on
Sunday, a 29.9 inch low pressure trough will move east to
Minnesota. This trough will dissipate as it moves over Lake
Superior on Monday.

LSZ162-050345-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
343 PM EDT Thu Jul 4 2024 /243 PM CDT Thu Jul 4 2024/

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy fog.
Isolated showers. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots increasing to 10 to
20 knots late. Patchy fog through midnight. A chance of showers
and a slight chance of thunderstorms. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots veering east in the
afternoon, then backing north late. A slight chance of showers. A
slight chance of thunderstorms by mid afternoon. Waves calm to
2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. A slight chance of
showers and thunderstorms by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...East winds 5 to 15 knots. A chance of showers through
early afternoon. Showers likely by mid afternoon. Waves calm to
2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots backing west after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering north. A chance
of showers. Waves calm to 2 feet.
.TUESDAY...South winds 5 to 15 knots veering west. Waves calm to
2 feet.

$$

LSZ263-050345-
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-
343 PM EDT Thu Jul 4 2024

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots. Patchy fog through
midnight. A chance of showers. A slight chance of thunderstorms
after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots diminishing to less than
10 knots late. A chance of showers. Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds less than 10 knots becoming west
5 to 15 knots after midnight. Waves calm to 2 feet.
.SATURDAY...Southwest winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...South winds 5 to 15 knots backing east by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots veering north. Waves calm
to 2 feet.
.TUESDAY...Southwest winds 5 to 15 knots veering west. Waves calm
to 2 feet.

$$

LSZ264-050345-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
343 PM EDT Thu Jul 4 2024

.LATE THIS AFTERNOON...East winds less than 10 knots. Patchy fog.
Waves calm to 2 feet.
.TONIGHT...East winds less than 10 knots becoming northeast 5 to
15 knots late. Patchy fog through midnight. A slight chance of
showers after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots becoming north less than
10 knots late. A slight chance of showers. Waves calm to 2 feet.
.FRIDAY NIGHT...Northwest winds less than 10 knots increasing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Southeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering southwest after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots becoming north less than
10 knots. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.

$$

LSZ265-050345-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
343 PM EDT Thu Jul 4 2024

.LATE THIS AFTERNOON...East winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots backing northeast late. A
chance of showers after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots backing north late. A
chance of showers. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots backing northwest after
midnight, then increasing to 10 to 20 knots late. A slight chance
of showers through midnight. Waves calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots becoming southeast 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots veering south
after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A chance of showers and thunderstorms
by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southeast winds 5 to 15 knots veering southwest
after midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots backing north. Waves calm to
2 feet.
.TUESDAY...North winds 5 to 15 knots backing west. Waves calm to
2 feet.

$$

LSZ266-050345-
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-
343 PM EDT Thu Jul 4 2024

.LATE THIS AFTERNOON...North winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Northeast winds 5 to 15 knots. Patchy fog through
midnight. A chance of showers after midnight. Waves calm to
2 feet.
.FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then becoming north 5 to 15 knots
late. A chance of showers. A slight chance of thunderstorms by
mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...North winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of showers. Waves calm to
2 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots backing southeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east. Waves calm to
2 feet.
.TUESDAY...Northwest winds 5 to 15 knots backing west. Waves calm
to 2 feet.

$$

LSZ267-050345-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
343 PM EDT Thu Jul 4 2024

.LATE THIS AFTERNOON...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...North winds 5 to 15 knots. A slight chance of showers
after midnight. Waves calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing north late. A chance of
showers. A slight chance of thunderstorms by mid afternoon. Waves
calm to 2 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots. A slight chance of
thunderstorms through midnight. A chance of showers. Waves calm
to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots backing west by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots backing southeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots backing west. Waves calm
to 2 feet.

$$

LSZ261-050345-
MAFOR 0421/
Superior West 11200 11100 14110 11110 11100. A chance of showers
overnight and Friday morning. Waves 2 feet or less.

Superior North Central 11800 13200 14100. Waves 2 feet or less.

Superior South Central 14200 14100. A chance of showers overnight
and Friday. Waves 1 foot or less.

Superior East 11700 11800 12700 11800 12100 11110. A chance of
showers Friday. Waves 1 foot or less.

$$

BW

Experimental modernized open lake forecast is available online at
weather.gov/mqt/glftable

Graphical marine forecasts are available online at:
weather.gov/greatlakes