588
FZUS63 KMQT 180758
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
358 AM EDT Thu Jul 18 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 30.2 inch high pressure currently centered over
Minnesota sags southeast today, becoming centered over southern
Wisconsin by this evening at 30.1 inches. The high pressure then
rises back to 30.2 inches tonight, expanding eastward along the
southern Great Lakes Basin. On Friday, the high pressure falls
back to 30.1 inches. A weak 30.0 inch troughing pushes south over
the lake Friday night into Saturday. More broad 30.2 inch high
pressure ridging extends across much of the Upper Midwest and
Upper Great Lakes Sunday. This is quickly followed by an
additional weak trough at 30.0 inches that drops south across the
Upper Great Lakes Sunday night and Monday. High pressure ridging
at 30.1 inches looks to return over Lake Superior for Tuesday.

LSZ162-181600-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
358 AM EDT Thu Jul 18 2024 /258 AM CDT Thu Jul 18 2024/

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves building to 1 to 3 feet.
.TONIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet, then
building to 1 to 3 feet.
.FRIDAY...Southwest winds 10 to 20 knots. Waves 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots veering northeast by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...East winds 5 to 15 knots backing northwest. Waves calm
to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-181600-
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 AM EDT Thu Jul 18 2024

.EARLY THIS MORNING...Northwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TODAY...West winds 5 to 15 knots backing southwest in the
afternoon, then increasing to 10 to 20 knots late. Waves building
to 2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering west late. Waves subsiding
to calm to 2 feet, then building to 1 to 3 feet.
.FRIDAY...Southwest winds 5 to 15 knots increasing to 15 to 25
knots in the afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots diminishing to
less than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots veering southwest. Waves
calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.

$$

LSZ264-181600-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
358 AM EDT Thu Jul 18 2024

.EARLY THIS MORNING...West winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots late. Waves building to 2 to 4 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then veering west late. Waves subsiding
to 1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...Southwest winds 5 to 15 knots increasing to 15 to 25
knots in the afternoon. Waves subsiding to 1 to 3 feet, then
building to 2 to 4 feet.
.FRIDAY NIGHT...West winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds less than 10 knots veering
northeast after midnight. Waves calm to 2 feet.
.SUNDAY...East winds less than 10 knots veering southwest. Waves
calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.

$$

LSZ265-181600-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
358 AM EDT Thu Jul 18 2024

.EARLY THIS MORNING...West winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots becoming southwest 10 to
20 knots after midnight. Waves building to 1 to 3 feet.
.FRIDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...East winds 5 to 15 knots veering west. Waves calm to
2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.

$$

LSZ266-181600-
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 AM EDT Thu Jul 18 2024

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves 1 to
3 feet.
.TODAY...Northwest winds 5 to 15 knots backing west in the
afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves building to 2 to 4 feet.
.FRIDAY...West winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots backing west. Waves calm
to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ267-181600-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
358 AM EDT Thu Jul 18 2024

.EARLY THIS MORNING...Northwest winds 10 to 20 knots. Waves 1 to
3 feet.
.TODAY...Northwest winds 5 to 15 knots becoming west 10 to
20 knots in the afternoon. Waves subsiding to calm to 2 feet.
.TONIGHT...West winds 5 to 15 knots backing southwest after
midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots veering west in the
afternoon, then diminishing to 5 to 15 knots late. Waves calm to
2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.SATURDAY...Northwest winds 5 to 15 knots. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots veering northeast
after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots backing northwest. Waves
calm to 2 feet.
.MONDAY...North winds 5 to 15 knots becoming northeast 10 to
20 knots. Waves calm to 2 feet.

$$

LSZ261-181600-
MAFOR 1809/
Superior West 11700 11600 11610 14510 11510. Waves 1 to 2 feet.

Superior North Central 11700 12600 11510 14520. Waves 1 to 4 feet.

Superior South Central 11710 11610 14600 11500 11510. Waves 2
feet or less.

Superior East 13700 13600 11500 11510. Waves 1 to 3 feet.

$$

Jablonski

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

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