597
FZUS63 KMQT 211347
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
947 AM EDT Tue May 21 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...Weak 29.9 inch ridging over Lake Superior this
morning will eventually give way to a 29.4 inch low pressure
currently over eastern Nebraska. This low deepens to 29.0 inches
as it lifts north-northeast, eventually tracking over the
Minnesota Arrowhead into Ontario late tonight and early Wednesday.
The low continues north into Ontario during the day Wednesday and
into Wednesday night as it weakens to 29.4 inches. 29.9 inch
ridging builds in Thursday across Lake Superior as the low slowly
moves east toward James Bay. This ridging shifts east as a 29.6
inch low lifts northeast through the Northern Plains Thursday
night into Friday. Weak troughing of 29.8 inches moves over Lake
Superior by Saturday.

LSZ162-212200-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
947 AM EDT Tue May 21 2024 /847 AM CDT Tue May 21 2024/

...GALE WARNING IN EFFECT FROM 5 PM EDT /4 PM CDT/ THIS AFTERNOON
THROUGH WEDNESDAY EVENING...

.REST OF TODAY...Northeast winds 10 to 20 knots increasing to
gales to 35 knots. A chance of rain showers by late morning, then
rain showers and a slight chance of thunderstorms by mid
afternoon. Waves calm to 2 feet building to 6 to 9 feet
occasionally to 11 feet.
.TONIGHT...East gales to 40 knots. Showers and a chance of
thunderstorms. Waves building to 10 to 14 feet occasionally to
18 feet, then subsiding to 7 to 10 feet occasionally to 13 feet.
.WEDNESDAY...Southwest gales to 45 knots. A slight chance of
thunderstorms through early afternoon. A chance of showers. Waves
subsiding to 6 to 9 feet occasionally to 11 feet, then building
to 10 to 14 feet occasionally to 18 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of showers through midnight.
Waves subsiding to 4 to 8 feet occasionally to 10 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots. A chance of rain showers, then rain showers likely.
Waves building to 3 to 5 feet occasionally to 7 feet, then
subsiding to 1 to 3 feet.
.SATURDAY...West winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ263-212200-
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-
947 AM EDT Tue May 21 2024

...GALE WARNING IN EFFECT FROM THIS EVENING THROUGH WEDNESDAY
EVENING...

.REST OF TODAY...Northeast winds 5 to 15 knots increasing to
15 to 25 knots in the afternoon, then becoming east 20 to
30 knots late. A chance of rain showers by late morning, then
rain showers likely and a slight chance of thunderstorms by mid
afternoon. Waves calm to 2 feet building to 4 to 7 feet
occasionally to 9 feet.
.TONIGHT...East gales to 35 knots veering southeast late. Showers
through midnight. A chance of thunderstorms. A chance of showers
after midnight. Waves building to 5 to 9 feet occasionally to
11 feet.
.WEDNESDAY...Southwest gales to 45 knots. A slight chance of
thunderstorms through early afternoon. A slight chance of
showers. Waves subsiding to 5 to 8 feet occasionally to 10 feet,
then building to 11 to 15 feet occasionally to 19 feet.
.WEDNESDAY NIGHT...West gales to 35 knots diminishing to 20 to
30 knots after midnight. A slight chance of showers through
midnight. Waves subsiding to 6 to 9 feet occasionally to 11 feet,
then building to 9 to 12 feet occasionally to 15 feet.
.THURSDAY...West winds 15 to 25 knots. Waves subsiding to 2 to
4 feet.
.THURSDAY NIGHT...North winds 5 to 15 knots. Waves subsiding to
calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots veering east. A chance
of rain showers, then rain showers likely. Waves building to 2 to
4 feet, then subsiding to 1 to 3 feet.
.SATURDAY...West winds 10 to 20 knots diminishing to 5 to
15 knots. A chance of rain showers. Waves subsiding to calm to
2 feet.

$$

LSZ264-212200-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
947 AM EDT Tue May 21 2024

...GALE WARNING IN EFFECT FROM THIS EVENING THROUGH WEDNESDAY
EVENING...

.REST OF TODAY...East winds 5 to 15 knots increasing to 15 to
25 knots. A chance of rain showers by mid afternoon. Waves calm
to 2 feet building to 2 to 4 feet.
.TONIGHT...East winds 20 to 30 knots increasing to gales to
35 knots after midnight, then veering southeast late. Showers
likely through midnight. A chance of thunderstorms. A chance of
showers after midnight. Waves building to 7 to 10 feet
occasionally to 13 feet.
.WEDNESDAY...South gales to 40 knots becoming southwest gales to
45 knots in the afternoon. A slight chance of thunderstorms
through early afternoon. A slight chance of showers. Waves
subsiding to 5 to 8 feet occasionally to 10 feet, then building
to 12 to 17 feet occasionally to 21 feet.
.WEDNESDAY NIGHT...Southwest gales to 35 knots becoming west
20 to 30 knots after midnight. A chance of rain showers. Waves
subsiding to 6 to 9 feet occasionally to 11 feet, then building
to 10 to 14 feet occasionally to 18 feet.
.THURSDAY...West winds 15 to 25 knots. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.THURSDAY NIGHT...Northwest winds 5 to 15 knots. Waves subsiding
to calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots. A chance of rain showers.
Waves building to 1 to 3 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming west 5 to
15 knots. A chance of rain showers. Waves building to 2 to
4 feet, then subsiding to calm to 2 feet.

$$

LSZ265-212200-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
947 AM EDT Tue May 21 2024

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH WEDNESDAY
MORNING...

.REST OF TODAY...East winds 5 to 15 knots increasing to 15 to
25 knots. A chance of rain showers by mid afternoon. Waves calm
to 2 feet building to 2 to 4 feet.
.TONIGHT...East winds 20 to 30 knots becoming southeast gales to
35 knots after midnight. Showers likely through midnight. A
chance of thunderstorms. A chance of showers after midnight.
Waves building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY...South gales to 35 knots becoming southwest 20 to
30 knots in the afternoon. A slight chance of showers. Waves
subsiding to 2 to 4 feet, then building to 3 to 6 feet
occasionally to 8 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A slight chance of showers through
midnight. Waves subsiding to 1 to 3 feet, then building to 4 to
7 feet occasionally to 9 feet.
.THURSDAY...West winds 15 to 25 knots. Waves subsiding to calm to
2 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots. A chance of rain showers.
Waves calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming west 5 to
15 knots. A chance of rain showers. Waves calm to 2 feet.

$$

LSZ266-212200-
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-
947 AM EDT Tue May 21 2024

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH WEDNESDAY
MORNING...

.REST OF TODAY...East winds 5 to 15 knots increasing to 10 to
20 knots late. A slight chance of rain showers by mid afternoon.
Waves calm to 2 feet.
.TONIGHT...East winds 20 to 30 knots becoming southeast gales to
40 knots after midnight. A chance of showers and thunderstorms.
Waves building to 6 to 9 feet occasionally to 11 feet.
.WEDNESDAY...South gales to 35 knots veering southwest late. A
slight chance of thunderstorms through early afternoon. A slight
chance of showers. Waves subsiding to 4 to 7 feet occasionally to
9 feet, then building to 11 to 15 feet occasionally to 19 feet.
.WEDNESDAY NIGHT...Southwest gales to 35 knots diminishing to
15 to 25 knots after midnight. A slight chance of rain showers.
Waves subsiding to 6 to 9 feet occasionally to 11 feet, then
building to 10 to 14 feet occasionally to 18 feet.
.THURSDAY...West winds 15 to 25 knots. Waves subsiding to 3 to
5 feet occasionally to 7 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots becoming northwest
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northeast winds 10 to 20 knots veering east. A chance
of rain showers. Waves building to 1 to 3 feet.
.SATURDAY...Southeast winds 10 to 20 knots becoming west 5 to
15 knots. A chance of rain showers. Waves building to 2 to
4 feet, then subsiding to calm to 2 feet.

$$

LSZ267-212200-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
947 AM EDT Tue May 21 2024

...GALE WARNING IN EFFECT FROM LATE TONIGHT THROUGH WEDNESDAY
MORNING...

.REST OF TODAY...Northeast winds 5 to 15 knots increasing to
10 to 20 knots in the afternoon, then veering east late. A slight
chance of rain showers by mid afternoon. Waves calm to 2 feet.
.TONIGHT...East winds 15 to 25 knots becoming southeast gales to
40 knots after midnight. A chance of showers through midnight. A
chance of thunderstorms. Showers after midnight. Waves building
to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY...South winds 20 to 30 knots becoming southwest 15 to
25 knots late. A slight chance of showers and thunderstorms
through early afternoon. Waves subsiding to 2 to 4 feet, then
building to 3 to 6 feet occasionally to 8 feet.
.WEDNESDAY NIGHT...Southwest winds 15 to 25 knots. A slight
chance of showers. Waves subsiding to 1 to 3 feet, then building
to 5 to 8 feet occasionally to 10 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots by mid afternoon. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.THURSDAY NIGHT...West winds 10 to 20 knots veering northwest
after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots veering east. A chance of
rain showers. Waves subsiding to calm to 2 feet.
.SATURDAY...Southeast winds 10 to 20 knots veering west. A chance
of rain showers. Waves building to 1 to 3 feet, then subsiding to
calm to 2 feet.

$$
LSZ261-212200-
MAFOR 2115/
Superior West...GALE WARNING IN EFFECT...11130 11146 14256 11350
11550. A chance of thunderstorms tonight. Waves 1 to 3 feet
building to 4 to 7 feet this afternoon. Waves 6 to 10 feet
building to 7 to 11 feet tonight and Wednesday morning.

Superior North Central...GALE WARNING IN EFFECT...11210 11220
11230 11246 12256 11350 11450. A chance of thunderstorms tonight.
Waves 2 feet or less this afternoon building to 6 to 10 feet
tonight and Wednesday morning.

Superior South Central...GALE WARNING IN EFFECT...11210 11220
12230 11256 12350 11440. A chance of thunderstorms tonight. Waves
2 feet or less this afternoon building to 3 to 6 feet tonight and
Wednesday morning.

Superior East...GALE WARNING IN EFFECT...12100 11210 11230 11340
11356 11350 11440. A chance of thunderstorms overnight. Waves 1
foot or less this afternoon building to 4 to 7 feet tonight and
Wednesday morning.

$$

Jablonski

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

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