177
FZUS63 KMQT 180137
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
937 PM EDT Wed Jul 17 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 over centered over
Minnesota sags southeast into the the Upper Mississippi river
Valley area by Thursday morning. The high weakens to 30.1 inches
as it slips south of Lake Superior Thursday night. Behind the
ridging, weak 30.0 inch troughing pushes over the lake Friday 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.

LSZ162-180945-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
937 PM EDT Wed Jul 17 2024 /837 PM CDT Wed Jul 17 2024/

.REST OF TONIGHT...West winds 5 to 15 knots veering northwest
after midnight. Waves calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots backing southwest in the
afternoon. Waves building to 1 to 3 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight, then increasing to 10 to 20 knots late. 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 10 to 20 knots becoming west 5 to
15 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 10 to 20 knots backing east 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 northeast. Waves calm
to 2 feet.
.MONDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.

$$

LSZ263-180945-
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-
937 PM EDT Wed Jul 17 2024

.REST OF TONIGHT...West winds 5 to 15 knots veering northwest
late. Waves calm to 2 feet.
.THURSDAY...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.
.THURSDAY NIGHT...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 10 to 20 knots. 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...West winds 5 to 15 knots veering northeast by mid
afternoon. 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 east. Waves calm
to 2 feet.
.MONDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-180945-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
937 PM EDT Wed Jul 17 2024

.REST OF TONIGHT...West winds 5 to 15 knots veering northwest
late. Waves calm to 2 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing southwest late.
Waves building to 2 to 4 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots veering west
after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...West winds 10 to 20 knots backing southwest by mid
afternoon. Waves 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...North winds 5 to 15 knots veering northeast by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds less than 10 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...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ265-180945-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
937 PM EDT Wed Jul 17 2024

.REST OF TONIGHT...Northwest winds 10 to 20 knots. Waves 1 to
3 feet subsiding to calm to 2 feet.
.THURSDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight, then veering west late. Waves calm to 2 feet.
.FRIDAY...West winds 10 to 20 knots diminishing to 5 to 15 knots
by mid afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots becoming west 10 to
20 knots after midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 10 to 20 knots becoming north 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...Northeast winds 5 to 15 knots backing west. Waves calm
to 2 feet.
.MONDAY...East winds 5 to 15 knots veering south. Waves calm to
2 feet.

$$

LSZ266-180945-
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-
937 PM EDT Wed Jul 17 2024

.REST OF TONIGHT...Northwest winds 10 to 20 knots. Waves 2 to
4 feet subsiding to 1 to 3 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing west in the
afternoon. Waves subsiding to calm to 2 feet.
.THURSDAY NIGHT...Southwest winds 5 to 15 knots increasing to
10 to 20 knots after midnight, then diminishing to 5 to 15 knots
late. Waves building to 1 to 3 feet.
.FRIDAY...West winds 5 to 15 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...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 north. Waves calm
to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering south. Waves calm
to 2 feet.

$$

LSZ267-180945-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
937 PM EDT Wed Jul 17 2024

.REST OF TONIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots late. Waves 3 to 5 feet occasionally to 7 feet
subsiding to 1 to 3 feet.
.THURSDAY...Northwest winds 5 to 15 knots backing west in the
afternoon, then increasing to 10 to 20 knots late. Waves
subsiding to calm to 2 feet.
.THURSDAY NIGHT...West winds 5 to 15 knots backing southwest
after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. 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 increasing to 10 to
20 knots by mid afternoon. 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 northwest. Waves
calm to 2 feet.
.MONDAY...North winds 5 to 15 knots veering southeast. Waves calm
to 2 feet.

$$
LSZ261-180945-
MAFOR 1803/
Superior West 11700 12710 11600 11610 13510. Waves 1 to 2 feet.

Superior North Central 11610 11710 12700 11610 11510 11610 11520.
Waves 1 to 2 feet overnight and Thursday building to 2 to 4 feet
Thursday evening.

Superior South Central 11720 13710 14600. Waves 1 to 3 feet
overnight through Thursday.


Superior East 11720 12710 12700 12610 11600. Waves 1 to 3 feet.

$$

BW

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

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