917
FZUS63 KMQT 031954
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
354 PM EDT Fri May 3 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 29.7 inch low pressure currently spinning over
northwest Ontario drags a 29.8 inch trough across Lake Superior
the rest of today into tonight before lifting northeast. Ridging
builds to 30.1 inches across eastern Lake Superior by Saturday
morning. A weak 29.9 inch trough moves into the Upper Great Lakes
Saturday evening before ridging at 30.1 inches returns by Sunday.
Ridging shifts east early next week as a broad 29.2 inch low
pressure develops on the Northern Plains on Monday. A strong
pressure gradient over western Lake Superior begins to setup
Tuesday morning as a deepening 29.0 inch low pushes eastward
against 30.0 inch ridging over far northern Ontario. A secondary
29.4 inch low pressure moves into southern Lake Superior
Wednesday morning.

LSZ162-040400-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
354 PM EDT Fri May 3 2024 /254 PM CDT Fri May 3 2024/

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 3 to
5 feet occasionally to 7 feet.
.TONIGHT...West winds 15 to 25 knots diminishing to 5 to 15 knots
after midnight, then backing southwest late. A chance of rain
showers. Waves subsiding to calm to 2 feet.
.SATURDAY...North winds 5 to 15 knots veering northeast in the
afternoon, then backing north late. A chance of rain showers.
Waves calm to 2 feet.
.SATURDAY NIGHT...West winds 5 to 15 knots increasing to 10 to
20 knots late. A slight chance of rain showers through midnight.
Waves calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots backing southwest by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...South winds 5 to 15 knots backing northeast after
midnight. Waves calm to 2 feet.
.MONDAY...East winds 10 to 20 knots becoming northeast 20 to
30 knots by mid afternoon. Waves building to 4 to 7 feet
occasionally to 9 feet.
.MONDAY NIGHT...East winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of rain showers after midnight.
Waves subsiding to 2 to 4 feet, then building to 3 to 5 feet
occasionally to 7 feet.
.TUESDAY...East winds 20 to 30 knots becoming northeast 15 to
25 knots. Rain showers. A chance of thunderstorms. A chance of
rain showers. Waves building to 3 to 6 feet occasionally to
8 feet, then subsiding to 2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to 1 to 3 feet.

$$

LSZ263-040400-
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-
354 PM EDT Fri May 3 2024

.LATE THIS AFTERNOON...Southwest winds 15 to 25 knots. Waves 2 to
4 feet building to 3 to 5 feet occasionally to 7 feet.
.TONIGHT...West winds 15 to 25 knots becoming southwest 10 to
20 knots after midnight, then diminishing to 5 to 15 knots late.
A chance of rain showers. Waves subsiding to 1 to 3 feet.
.SATURDAY...North winds 5 to 15 knots veering northeast in the
afternoon. A chance of rain showers. Waves subsiding to calm to
2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots backing west
after midnight. A slight chance of rain showers through midnight.
Waves calm to 2 feet.
.SUNDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves building to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots backing southeast
after midnight. Waves subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
by mid afternoon. Waves building to 1 to 3 feet.
.MONDAY NIGHT...East winds 10 to 20 knots. A chance of rain
showers after midnight. Waves building to 2 to 4 feet, then
subsiding to 1 to 3 feet.
.TUESDAY...East winds 15 to 25 knots. Rain showers and a chance
of thunderstorms. Waves building to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. A chance of rain
showers. Waves subsiding to 1 to 3 feet.

$$

LSZ264-040400-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
354 PM EDT Fri May 3 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 late. A chance of rain showers. Waves subsiding to 1 to
3 feet.
.SATURDAY...Southwest winds less than 10 knots becoming east 5 to
15 knots in the afternoon, then backing northeast late. A chance
of rain showers. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 5 to 15 knots. A chance of rain
showers. Waves building to 1 to 3 feet.
.SUNDAY...West winds 5 to 15 knots. Waves subsiding to calm to
2 feet, then building to 1 to 3 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming southeast 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots veering southeast after
midnight. Waves building to 2 to 4 feet.
.TUESDAY...East winds 15 to 25 knots. Rain showers likely. Waves
building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...Northeast winds 10 to 20 knots. A chance of rain
showers. Waves subsiding to 1 to 3 feet.

$$

LSZ265-040400-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
354 PM EDT Fri May 3 2024

.LATE THIS AFTERNOON...South winds 10 to 20 knots. Waves calm to
2 feet.
.TONIGHT...Southwest winds 5 to 15 knots backing south late.
Sprinkles after midnight. Waves calm to 2 feet.
.SATURDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon. A chance of rain showers by mid
afternoon. Waves calm to 2 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots backing west
after midnight. A chance of rain showers. Waves building to 1 to
3 feet, then subsiding to calm to 2 feet.
.SUNDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Southwest winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. Waves building to 1 to 3 feet.
.TUESDAY...East winds 15 to 25 knots. Showers likely. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to 1 to 3 feet.

$$

LSZ266-040400-
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-
354 PM EDT Fri May 3 2024

.LATE THIS AFTERNOON...Southeast winds 10 to 20 knots. Waves 1 to
3 feet.
.TONIGHT...South winds 10 to 20 knots diminishing to 5 to
15 knots late. Waves 1 to 3 feet.
.SATURDAY...South winds 5 to 15 knots becoming east 10 to
20 knots in the afternoon. A chance of rain showers by mid
afternoon. Waves subsiding to calm to 2 feet, then building to
1 to 3 feet.
.SATURDAY NIGHT...Northwest winds 10 to 20 knots increasing to
15 to 25 knots after midnight, then diminishing to 10 to 20 knots
late. A chance of rain showers. Waves building to 2 to 4 feet.
.SUNDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...South winds 5 to 15 knots becoming east 10 to 20 knots
by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots veering southeast after
midnight. Waves building to 1 to 3 feet.
.TUESDAY...East winds 15 to 25 knots. Showers likely. Waves
building to 3 to 5 feet occasionally to 7 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to 1 to 3 feet.

$$

LSZ267-040400-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
354 PM EDT Fri May 3 2024

.LATE THIS AFTERNOON...Southeast winds 5 to 15 knots. Waves calm
to 2 feet.
.TONIGHT...South winds 10 to 20 knots. Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots. A slight chance of
rain showers by mid afternoon. Waves building to 1 to 3 feet.
.SATURDAY NIGHT...Southeast winds 10 to 20 knots veering west
after midnight, then becoming northwest 15 to 25 knots late. A
chance of rain showers. Waves subsiding to calm to 2 feet, then
building to 2 to 4 feet.
.SUNDAY...West winds 15 to 25 knots diminishing to 10 to 20 knots
by mid afternoon. Waves subsiding to 1 to 3 feet.
.SUNDAY NIGHT...West winds 5 to 15 knots backing south after
midnight. Waves subsiding to calm to 2 feet.
.MONDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots veering southeast after
midnight. Waves calm to 2 feet.
.TUESDAY...Southeast winds 15 to 25 knots backing east. Showers
likely. Waves building to 2 to 4 feet, then subsiding to 1 to
3 feet.
.WEDNESDAY...Northeast winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to calm to
2 feet.

$$

LSZ261-040400-
MAFOR 0321/
Superior West 11540 11630 11620 11510 11500 11700 12110. A chance
of rain showers. Waves 3 to 5 feet subsiding to 1 to 3 feet
tonight and Saturday.

Superior North Central 14520 11510 11500 11200 11210. Waves 2 to
4 feet tonight. Waves 1 to 3 feet Saturday.

Superior South Central 11410 11500 11410 11610 11400 11300 11310
11210. Waves 2 feet or less.

Superior East 12310 11420 11520 11510 13310. 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