163
FZUS63 KMQT 181940
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
340 PM 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
the Upper Mississippi Valley continues sagging south today,
becoming centered over the Wisconsin/Illinois border by this
evening. The high pressure expands eastward along the southern
Great Lakes Basin tonight before falling to 30.1 inches Friday. A
weak 30.0 inch trough pushes south over the lake Friday night into
Saturday. More broad 30.1 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 of at least 30.1 inches looks to
return over Lake Superior for Tuesday.

LSZ162-190345-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
340 PM EDT Thu Jul 18 2024 /240 PM CDT Thu Jul 18 2024/

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots. Waves building to 1 to
3 feet.
.FRIDAY 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.
.SATURDAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A slight chance of showers and
thunderstorms. Waves calm to 2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 5 to 15 knots backing northwest
after midnight. Waves calm to 2 feet.
.MONDAY...East winds 5 to 15 knots becoming northeast 10 to
20 knots. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ263-190345-
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-
340 PM EDT Thu Jul 18 2024

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves calm
to 2 feet building to 1 to 3 feet.
.TONIGHT...Southwest winds 15 to 25 knots diminishing to 5 to
15 knots. Waves building to 2 to 4 feet, then subsiding to calm
to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming west 5 to
15 knots after midnight. A slight chance of showers and
thunderstorms after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...Northeast winds 5 to 15 knots. A slight chance of
showers and thunderstorms through early afternoon. Waves calm to
2 feet.
.SATURDAY NIGHT...Northeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.
.SUNDAY NIGHT...East winds 5 to 15 knots becoming west less than
10 knots after midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ264-190345-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
340 PM EDT Thu Jul 18 2024

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves calm
to 2 feet building to 1 to 3 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves subsiding to calm to 2 feet.
.FRIDAY...Southwest winds 10 to 20 knots increasing to 15 to
25 knots late. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...West winds 15 to 25 knots diminishing to 10 to
20 knots after midnight, then becoming north 5 to 15 knots late.
A chance of showers and a slight chance of thunderstorms 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 5 to 15 knots becoming northeast
less than 10 knots after midnight. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots veering south by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds less than 10 knots becoming west
5 to 15 knots after midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.TUESDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.

$$

LSZ265-190345-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
340 PM EDT Thu Jul 18 2024

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight. Waves calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots. Waves calm to 2 feet.
.FRIDAY NIGHT...West winds 5 to 15 knots becoming southwest 10 to
20 knots after midnight, then becoming west 5 to 15 knots late.
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...Northeast winds 5 to 15 knots veering east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.

$$

LSZ266-190345-
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-
340 PM EDT Thu Jul 18 2024

.LATE THIS AFTERNOON...Southwest winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...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, then subsiding to calm to 2 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 late. A slight chance of showers after midnight. Waves
subsiding to calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots. A slight chance of showers
through early 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 north by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...West winds less than 10 knots increasing to 5 to
15 knots after midnight. Waves calm to 2 feet.
.MONDAY...Northeast winds 5 to 15 knots veering east. Waves calm
to 2 feet.
.TUESDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.

$$

LSZ267-190345-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
340 PM EDT Thu Jul 18 2024

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 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 becoming west 5 to
15 knots in the afternoon. Waves calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 5 to 15 knots increasing to 10 to
20 knots after midnight, then becoming west 5 to 15 knots late.
Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots increasing to 10 to
20 knots by mid afternoon. A slight chance of showers through
early 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 by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...North winds 5 to 15 knots veering east. Waves calm to
2 feet.
.TUESDAY...Northeast winds 10 to 20 knots becoming east 5 to
15 knots. Waves calm to 2 feet.

$$

LSZ261-190345-
MAFOR 1821/
Superior West 11520 14510 13520. Waves 1 to 3 feet.

Superior North Central 11520 11530 14520 11520 11530. Waves 1 to
3 feet tonight. Waves 1 to 3 feet building to 2 to 4 feet Friday.

Superior South Central 11400 12500 12510 13610. Waves 2 feet or
less.

Superior East 11610 12500 14510 11510. Waves 1 to 2 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