339
FZUS63 KMQT 210745
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
345 AM EDT Fri Jun 21 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...High pressure of 30.4 inches centered near Isle
Royale will weaken to 30.2 inches as it very slowly drifts
southeast across central and eastern Lake Superior today. On
Saturday, the high will transition to ridging of 30.0 inches
extending from northern Ontario across southern Quebec. Meanwhile,
29.7 low pressure developing over eastern Colorado on Friday will
track northeast to Wisconsin by Saturday evening. As the low
passes near the Straits of Mackinac during Saturday night and
reaches southern Quebec during Sunday, it will deepen to 29.5
inches. In its wake, 29.9 inch high pressure building into the
Northern Plains on Sunday will settle over the western Great Lakes
region on Monday and then the Appalachians on Tuesday. Back to
the northwest, 29.3 inch low pressure over Manitoba Monday night
will track east toward James Bay on Tuesday, pushing an associated
29.6 inch trough across Lake Superior.

LSZ162-211545-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
345 AM EDT Fri Jun 21 2024 /245 AM CDT Fri Jun 21 2024/

.EARLY THIS MORNING...Northeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...Northeast winds 5 to 15 knots veering east late. A
chance of showers. A slight chance of thunderstorms by mid
afternoon. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots veering east after
midnight, then becoming northeast 10 to 20 knots late. A chance
of showers and a slight chance of thunderstorms. Waves building
to 1 to 3 feet.
.SATURDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. A chance of showers and a slight
chance of thunderstorms. Waves building to 3 to 5 feet
occasionally to 7 feet, then subsiding to 2 to 4 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing northwest
after midnight. A slight chance of thunderstorms through
midnight. A chance of showers. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots. A chance of showers. Waves
calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of showers and thunderstorms. Waves calm to 2 feet.
.TUESDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.

$$

LSZ263-211545-
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-
345 AM EDT Fri Jun 21 2024

.EARLY THIS MORNING...Northeast winds less than 10 knots. Waves
calm to 2 feet.
.TODAY...East winds less than 10 knots increasing to 5 to
15 knots in the afternoon. A chance of showers. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots. A chance of showers and a
slight chance of thunderstorms. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots backing northeast in the
afternoon. A chance of showers and a slight chance of
thunderstorms. Waves building to 2 to 4 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots backing northwest
after midnight. A slight chance of thunderstorms through
midnight. A chance of showers. Waves subsiding to calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots. A chance of showers. Waves
calm to 2 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots. Waves calm to 2 feet.
.MONDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of showers and thunderstorms. Waves building to 1 to
3 feet.
.TUESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. Waves building to 3 to 5 feet occasionally to 7 feet,
then subsiding to 1 to 3 feet.

$$

LSZ264-211545-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
345 AM EDT Fri Jun 21 2024

.EARLY THIS MORNING...West winds less than 10 knots. Waves calm
to 2 feet.
.TODAY...North winds less than 10 knots veering east in the
afternoon, then veering southwest late. A slight chance of
showers by mid afternoon. Waves calm to 2 feet.
.TONIGHT...South winds less than 10 knots backing southeast after
midnight, then becoming east 5 to 15 knots late. A slight chance
of showers after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon, then backing northeast late. A chance of
showers. A slight chance of thunderstorms by mid afternoon. Waves
calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots. A slight chance of
thunderstorms through midnight. A chance of showers. Waves calm
to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots backing west by mid
afternoon. A chance of showers and thunderstorms. Waves calm to
2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...South winds 5 to 15 knots increasing to 10 to 20 knots.
A chance of showers and thunderstorms. Waves building to 1 to
3 feet.
.TUESDAY...Southwest winds 15 to 25 knots becoming northwest
10 to 20 knots. Waves building to 3 to 5 feet occasionally to
7 feet, then subsiding to 2 to 4 feet.

$$

LSZ265-211545-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
345 AM EDT Fri Jun 21 2024

.EARLY THIS MORNING...North winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...Northeast winds 5 to 15 knots. A slight chance of
showers by mid afternoon. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots backing east late. A
chance of showers and a slight chance of thunderstorms after
midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Showers likely. A slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots backing northwest
after midnight. A slight chance of thunderstorms through
midnight. A chance of showers. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.SUNDAY NIGHT...West winds 10 to 20 knots veering northwest after
midnight. Waves calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers. Waves calm to 2 feet.
.TUESDAY...West winds 15 to 25 knots. Waves calm to 2 feet.

$$

LSZ266-211545-
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-
345 AM EDT Fri Jun 21 2024

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...North winds 5 to 15 knots. A slight chance of showers by
mid afternoon. Waves calm to 2 feet.
.TONIGHT...South winds 5 to 15 knots backing east after midnight.
A slight chance of showers after midnight. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. A chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 10 to 20 knots. A slight chance of
thunderstorms through midnight. A chance of showers. Waves calm
to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots. A chance of showers.
Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.MONDAY...Northwest winds 5 to 15 knots becoming south 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet.
.TUESDAY...Southwest winds 15 to 25 knots becoming west 10 to
20 knots. A chance of showers. Waves building to 2 to 4 feet.

$$

LSZ267-211545-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
345 AM EDT Fri Jun 21 2024

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

$$

LSZ261-211545-
MAFOR 2109/
Superior West 12100 13200 11100 11200 11210. A chance of showers
this afternoon and overnight. Waves 1 to 2 feet.

Superior North Central 11700 12800 11700 11500 12400 11300. Waves
1 foot or less.

Superior South Central 12800 12100 11200 13300. A chance of
showers overnight. Waves 1 foot or less.

Superior East 15700 11800 11100. Waves 1 foot or less.

$$

WFO MQT

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

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