181
FZUS63 KMQT 231958
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
358 PM EDT Sun Jun 23 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...A 29.8 inch ridge continues to shift into the Upper
Great Lakes from the west tonight while a deepening low pressure
at 29.4 inches exits into Quebec. The high pressure ridge will
shift southeast, reaching the Appalachians on Tuesday while
building to 30.0 inches. Monday night, a 29.3 inch low will track
east through Manitoba, spinning across northern Ontario into James
Bay Tuesday at 29.2 inches. This low will support a 29.5 inch
trough across Lake Superior Monday night and Tuesday. 29.9 inch
high pressure from the High Plains then extends into the Upper
Great Lakes Wednesday. This high anchors and builds to 30.0
inches Thursday morning over the Upper Great Lakes. A 29.3 inch
low tracks across northern Minnesota on Friday enabling a 29.4
inch trough over western Lake Superior Friday afternoon.

LSZ162-240400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
358 PM EDT Sun Jun 23 2024 /258 PM CDT Sun Jun 23 2024/

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Isolated
showers. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing south late. Waves
calm to 2 feet.
.MONDAY...South winds 5 to 15 knots backing east in the
afternoon. A slight chance of showers and thunderstorms by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots veering southwest late.
A chance of showers and thunderstorms. Waves calm to 2 feet.
.TUESDAY...Southwest winds 15 to 25 knots becoming west 20 to
30 knots by mid afternoon. Waves building to 3 to 6 feet
occasionally to 8 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet.
.WEDNESDAY...North winds 10 to 20 knots veering south by mid
afternoon. Waves calm to 2 feet.
.WEDNESDAY NIGHT...North winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...East winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. A chance of thunderstorms. Waves
calm to 2 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering west. Showers
likely. A chance of showers. Waves building to 1 to 3 feet, then
subsiding to 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-
358 PM EDT Sun Jun 23 2024

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Isolated
showers. Waves 1 to 3 feet subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing southeast late.
Waves calm to 2 feet.
.MONDAY NIGHT...Southeast winds 5 to 15 knots veering south after
midnight, then becoming southwest 10 to 20 knots late. Showers
likely and a chance of thunderstorms. Waves building to 1 to
3 feet.
.TUESDAY...West winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.WEDNESDAY...North winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...Southwest winds 5 to 15 knots backing south
after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet.
.FRIDAY...South winds 10 to 20 knots. Showers likely. A chance of
showers. Waves 1 to 3 feet.

$$

LSZ264-240400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
358 PM EDT Sun Jun 23 2024

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Isolated
showers. Waves 1 to 3 feet.
.TONIGHT...West winds 5 to 15 knots. Patchy fog after midnight.
Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing southeast late.
Waves calm to 2 feet.
.MONDAY NIGHT...South winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then veering southwest late. A chance of
showers through midnight. A chance of thunderstorms. Showers
likely after midnight. Waves building to 2 to 4 feet.
.TUESDAY...West winds 15 to 25 knots. Waves building to 3 to
6 feet occasionally to 8 feet.
.TUESDAY NIGHT...Northwest winds 15 to 25 knots becoming north
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...North winds 5 to 15 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.THURSDAY...South winds 5 to 15 knots increasing to 10 to
20 knots. Waves building to 1 to 3 feet.
.FRIDAY...Southeast winds 10 to 20 knots veering south. A chance
of showers. Waves building to 2 to 4 feet.

$$

LSZ265-240400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
358 PM EDT Sun Jun 23 2024

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Isolated
showers. Waves 1 to 3 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots becoming southeast 10 to
20 knots in the afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots. A slight chance of
showers through midnight. A chance of thunderstorms. Showers
likely after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.TUESDAY...West winds 15 to 25 knots. A slight chance of showers
and thunderstorms through early afternoon. Waves subsiding to
calm to 2 feet, then building to 1 to 3 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.WEDNESDAY NIGHT...West winds 5 to 15 knots. Waves calm to
2 feet.
.THURSDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. Waves calm to 2 feet.
.FRIDAY...Southeast winds 15 to 25 knots veering south. A chance
of showers. Waves building to 1 to 3 feet, then subsiding to 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-
358 PM EDT Sun Jun 23 2024

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Isolated
showers. Waves 2 to 4 feet.
.TONIGHT...Northwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Isolated showers through midnight.
Patchy fog after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing south in the
afternoon, then becoming southeast 10 to 20 knots late. Waves
calm to 2 feet.
.MONDAY NIGHT...South winds 15 to 25 knots. A slight chance of
showers through midnight. A chance of thunderstorms. Showers
likely after midnight. Waves building to 3 to 5 feet occasionally
to 7 feet, then subsiding to 2 to 4 feet.
.TUESDAY...Southwest winds 15 to 25 knots veering west by mid
afternoon. A slight chance of showers and thunderstorms through
early afternoon. Waves building to 3 to 6 feet occasionally to
8 feet.
.TUESDAY NIGHT...West winds 15 to 25 knots veering northwest
after midnight. Waves subsiding to 2 to 4 feet.
.WEDNESDAY...North winds 15 to 25 knots becoming northwest 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.THURSDAY...Southeast winds 5 to 15 knots becoming south 10 to
20 knots. Waves building to 1 to 3 feet.
.FRIDAY...South winds 15 to 25 knots. A chance of showers.
Showers likely. Waves building to 2 to 4 feet.

$$

LSZ267-240400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
358 PM EDT Sun Jun 23 2024

.LATE THIS AFTERNOON...Northwest winds 15 to 25 knots. Scattered
showers and isolated thunderstorms. Waves 2 to 4 feet.
.TONIGHT...West winds 10 to 20 knots diminishing to 5 to 15 knots
late. Isolated showers and thunderstorms through midnight. Patchy
fog after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...West winds 5 to 15 knots backing southwest in the
afternoon, then backing east late. Waves calm to 2 feet.
.MONDAY NIGHT...South winds 10 to 20 knots increasing to 15 to
25 knots after midnight. Showers likely and a slight chance of
thunderstorms after midnight. Waves building to 2 to 4 feet.
.TUESDAY...Southwest winds 15 to 25 knots veering west by mid
afternoon. A chance of showers and thunderstorms through early
afternoon. Waves subsiding to 1 to 3 feet, then building to 2 to
4 feet.
.TUESDAY NIGHT...West winds 10 to 20 knots veering northwest
after midnight. Waves 2 to 4 feet.
.WEDNESDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to 1 to 3 feet.
.WEDNESDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots becoming southeast 10 to
20 knots. Waves calm to 2 feet.
.FRIDAY...Southeast winds 15 to 25 knots veering south. A chance
of showers, then showers likely. Waves building to 2 to 4 feet,
then subsiding to 1 to 3 feet.

$$

LSZ261-240400-
MAFOR 2321/
Superior West 11600 13500 13400 11300. Waves 2 feet or less.

Superior North Central 14610 11610 12500 11310. Waves 1 to 3 feet.

Superior South Central 11720 11610 13600 11500 11300 11310. Waves
1 to 3 feet.

Superior East 11720 19726 11710 12610 12600 11500 11400. Waves 2
to 4 feet tonight subsiding to 1 to 2 feet Monday.

$$

JSS

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

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