822
FZUS63 KMQT 232009
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
409 PM EDT Thu May 23 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 29.4 inch low pressure currently over James Bay
will continue to weaken and slowly drift northeast into Quebec
tonight. In its wake, 29.9 inch ridging will build across Lake
Superior. This ridging shifts east late Friday night as a 29.4
inch low lifts northeast through the Northern Plains. Troughing of
29.6 inches moves over Lake Superior by Saturday morning, but is
short lived as 29.9 inch high pressure builds over the Great Lakes
Saturday afternoon through Sunday morning. Meanwhile, another low
pressure begins to develop in the lee of the Rockies, pushing
northeast and reaching Lake Michigan at 29.4 inches by early
Monday morning. This low continues into Quebec Tuesday and 29.8
inch high pressure nudges in from the northern Plains.

LSZ162-240415-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
409 PM EDT Thu May 23 2024 /309 PM CDT Thu May 23 2024/

...GALE WARNING IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY
EVENING...

.LATE THIS AFTERNOON...South winds 5 to 15 knots. Waves calm to
2 feet.
.TONIGHT...East winds 5 to 15 knots increasing to 15 to 25 knots.
Waves building to 3 to 6 feet occasionally to 8 feet.
.FRIDAY...East winds 20 to 30 knots increasing to gales to 35
knots in the afternoon. A chance of rain showers through early
afternoon, then rain showers and a slight chance of thunderstorms
by mid afternoon. Waves building to 7 to 11 feet occasionally to
14 feet.
.FRIDAY NIGHT...East winds 20 to 30 knots veering south after
midnight, then becoming west 15 to 25 knots late. A chance of
rain showers and a slight chance of thunderstorms. Waves
subsiding to 2 to 4 feet.
.SATURDAY...Southwest winds 15 to 25 knots. Waves building to
3 to 5 feet occasionally to 7 feet, then subsiding to 2 to
4 feet.
.SATURDAY NIGHT...Southwest winds 10 to 20 knots becoming east
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.SUNDAY...East winds 10 to 20 knots backing northeast by mid
afternoon. A chance of showers. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots backing northwest. A chance
of showers. Waves calm to 2 feet.
.TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.

$$

LSZ263-240415-
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-
409 PM EDT Thu May 23 2024

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

$$

LSZ264-240415-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
409 PM EDT Thu May 23 2024

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

$$

LSZ265-240415-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
409 PM EDT Thu May 23 2024

.LATE THIS AFTERNOON...Northwest winds 10 to 20 knots. Waves calm
to 2 feet.
.TONIGHT...North winds 5 to 15 knots veering northeast late.
Waves calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 15 to 25 knots
in the afternoon. A chance of rain showers by mid afternoon.
Waves building to 1 to 3 feet.
.FRIDAY NIGHT...Southeast winds 15 to 25 knots veering southwest
late. Showers and a slight chance of thunderstorms. Waves
building to 2 to 4 feet.
.SATURDAY...West winds 10 to 20 knots. A slight chance of showers
through early afternoon. Waves subsiding to calm to 2 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots backing northwest. A chance
of showers. Waves building to 1 to 3 feet, then subsiding to calm
to 2 feet.
.TUESDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of showers. Waves building to 1 to 3 feet,
then subsiding to calm to 2 feet.

$$

LSZ266-240415-
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-
409 PM EDT Thu May 23 2024

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 5 to 15 knots veering north after
midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 5 to 15 knots increasing to 10 to 20 knots
in the afternoon. A slight chance of rain showers by mid
afternoon. Waves building to 1 to 3 feet.
.FRIDAY NIGHT...East winds 15 to 25 knots veering south late.
Rain showers and a slight chance of thunderstorms. Waves building
to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 10 to 20 knots. A chance of showers and a
slight chance of thunderstorms through early afternoon. Waves
subsiding to 2 to 4 feet.
.SATURDAY NIGHT...South winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.SUNDAY...Southeast winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots backing northwest. A chance
of showers. Waves building to 2 to 4 feet.
.TUESDAY...Northwest winds 15 to 25 knots becoming north 10 to
20 knots. A chance of showers. Waves 2 to 4 feet.

$$

LSZ267-240415-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
409 PM EDT Thu May 23 2024

.LATE THIS AFTERNOON...West winds 10 to 20 knots. Waves 3 to
5 feet occasionally to 7 feet subsiding to 2 to 4 feet.
.TONIGHT...Northwest winds 10 to 20 knots veering north late.
Waves subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 5 to 15 knots veering east in the
afternoon, then increasing to 10 to 20 knots late. Waves calm to
2 feet.
.FRIDAY NIGHT...East winds 10 to 20 knots becoming southeast
15 to 25 knots after midnight. Showers. A slight chance of
thunderstorms after midnight. Waves building to 3 to 5 feet
occasionally to 7 feet.
.SATURDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. A chance of showers and a slight
chance of thunderstorms through early afternoon. Waves subsiding
to calm to 2 feet.
.SATURDAY NIGHT...Southeast winds 5 to 15 knots. Waves calm to
2 feet.
.SUNDAY...Southeast winds 10 to 20 knots backing east by mid
afternoon. Waves calm to 2 feet.
.SUNDAY NIGHT...Northeast winds 10 to 20 knots. A chance of
showers. Waves calm to 2 feet.
.MONDAY...North winds 10 to 20 knots backing northwest. A chance
of showers. Waves building to 2 to 4 feet.
.TUESDAY...Northwest winds 15 to 25 knots veering north. A chance
of showers. Waves 2 to 4 feet.

$$

LSZ261-240415-
MAFOR 2321/
Superior West...GALE WARNING IN EFFECT...11400 11300 11210 11220
13240 11256. Waves 2 feet or less building to 2 to 4 feet
tonight, then building to 7 to 10 feet Friday.

Superior North Central 11620 11710 11800 11810 11100 11210 11220
11230. Waves 1 to 4 feet tonight and Friday.


Superior South Central 11710 11700 11800 12100 11210 11220 11230.
Waves 1 to 3 feet.

Superior East 11620 12710 11810 11800 11100 11200 11210. Waves 2
to 5 feet tonight. Waves 1 to 2 feet Friday.

$$

BW

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

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