818
FZUS63 KMQT 191941
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
341 PM EDT Fri Jul 19 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 30.1 inch high pressure currently centered over
the Lower Great Lakes eventually gives way to 30.0 inch trough
pushing south from Canada over the lake tonight into Saturday. A
30.1 inch high follows, building over Lake Superior Sunday and
Monday. Weak 30.0 inch troughing extending over the High Plains
and western Great Lakes develops Monday night, deeping to 29.9
inches on Wednesday.


LSZ162-200345-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
341 PM EDT Fri Jul 19 2024 /241 PM CDT Fri Jul 19 2024/

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots late. A slight chance of showers and thunderstorms after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...West winds 5 to 15 knots veering northeast in the
afternoon, then increasing to 10 to 20 knots late. A chance of
thunderstorms and a slight chance of showers. 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...East winds 5 to 15 knots veering west after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 10 to 20 knots. Waves calm to
2 feet.
.TUESDAY...Northeast winds 10 to 20 knots. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots becoming northwest
5 to 15 knots. Waves calm to 2 feet.

$$

LSZ263-200345-
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-
341 PM EDT Fri Jul 19 2024

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 2 to
4 feet.
.TONIGHT...Southwest winds 10 to 20 knots veering west after
midnight, then diminishing to 5 to 15 knots late. 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. 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...Southwest winds 5 to 15 knots diminishing to less
than 10 knots after midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing northeast by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots diminishing to 5 to
15 knots. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots backing northwest.
Waves calm to 2 feet.

$$

LSZ264-200345-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
341 PM EDT Fri Jul 19 2024

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 2 to
4 feet.
.TONIGHT...Southwest winds 10 to 20 knots becoming west 5 to
15 knots after midnight, then veering northwest late. A slight
chance of showers and thunderstorms. Waves subsiding to calm to
2 feet.
.SATURDAY...Northeast 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
late. Waves calm to 2 feet.
.SUNDAY...East winds 5 to 15 knots veering south by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots becoming northwest
less than 10 knots. Waves calm to 2 feet.

$$

LSZ265-200345-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
341 PM EDT Fri Jul 19 2024

.LATE THIS AFTERNOON...West winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...Southwest winds 5 to 15 knots becoming west 10 to
20 knots late. A slight chance of showers after midnight. Waves
calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots veering northeast in the
afternoon, then becoming north 5 to 15 knots late. A slight
chance of showers through early 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 southwest after
midnight. Waves calm to 2 feet.
.MONDAY...Southwest winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots backing northeast. Waves calm
to 2 feet.
.WEDNESDAY...Northeast winds 5 to 15 knots backing northwest.
Waves calm to 2 feet.

$$

LSZ266-200345-
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-
341 PM EDT Fri Jul 19 2024

.LATE THIS AFTERNOON...Southwest winds 10 to 20 knots. Waves 2 to
4 feet.
.TONIGHT...Southwest winds 10 to 20 knots diminishing to 5 to
15 knots after midnight, then becoming west 10 to 20 knots late.
A slight chance of showers and thunderstorms after midnight.
Waves subsiding to calm to 2 feet.
.SATURDAY...North winds 10 to 20 knots diminishing to 5 to
15 knots late. A slight chance of showers through early
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...North winds 5 to 15 knots veering northeast
late. Waves calm to 2 feet.
.SUNDAY...Northeast winds 5 to 15 knots backing north by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Southwest winds 5 to 15 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots. Waves calm to 2 feet.
.TUESDAY...East winds 5 to 15 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 5 to 15 knots backing north. Waves calm
to 2 feet.

$$

LSZ267-200345-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
341 PM EDT Fri Jul 19 2024

.LATE THIS AFTERNOON...West 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 veering west late. A slight chance
of showers after midnight. Waves calm to 2 feet.
.SATURDAY...Northwest winds 5 to 15 knots veering north in the
afternoon, then becoming northwest 10 to 20 knots late. A slight
chance of showers and thunderstorms through early afternoon.
Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots veering
northeast after midnight, then diminishing to 5 to 15 knots late.
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 backing west after
midnight. Waves calm to 2 feet.
.MONDAY...West winds 5 to 15 knots veering north by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots veering east after
midnight. Waves calm to 2 feet.
.TUESDAY...East winds 10 to 20 knots. Waves calm to 2 feet.
.WEDNESDAY...East winds 10 to 20 knots backing north. A chance of
showers. Waves calm to 2 feet.

$$

LSZ261-200345-
MAFOR 1921/
Superior West 11520 11510 11520 12610 11700 11110 11210. Waves 1
to 3 feet.

Superior North Central 11530 11520 11620 11610 11710 13110. Waves
2 to 4 feet tonight. Waves 1 to 2 feet Saturday.

Superior South Central 11610 13510 11610 11710 11810 11800. Waves
1 foot or less.

Superior East 13500 11510 11600 11700 12800. 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