416
FZUS63 KMQT 200744
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
344 AM EDT Mon May 20 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 system will shift east
from Iowa to Lake Michigan today. A period of weak 29.9 inch
ridging follows for late tonight into Tuesday morning over Lake
Superior. A 29.5 inch low pressure develops over the Plains
Tuesday, then deepens to 29.2 inches as it lifts northeast,
eventually tracking over western and north central Lake Superior
late Tuesday night into Wednesday. The low continues toward James
Bay Wednesday and Wednesday night as it weakens to 29.4 inches.
29.9 inch ridging builds in by Thursday across Lake Superior. This
ridging will shift east as a 29.6 inch low passes through the
Northern Great Plains Friday.

LSZ162-201545-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
344 AM EDT Mon May 20 2024 /244 AM CDT Mon May 20 2024/

...GALE WATCH IN EFFECT FROM TUESDAY EVENING THROUGH WEDNESDAY
EVENING...

.EARLY THIS MORNING...East winds 5 to 15 knots. A chance of
showers. Waves calm to 2 feet.
.TODAY...Northeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then diminishing to 5 to 15 knots
late. A chance of showers. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots backing north after
midnight, then veering northeast late. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 20 to
30 knots. A chance of rain showers. A slight chance of
thunderstorms by mid afternoon. Waves building to 5 to 8 feet
occasionally to 10 feet.
.TUESDAY NIGHT...Northeast gales to 35 knots. Showers and a
chance of thunderstorms. Waves building to 9 to 12 feet
occasionally to 15 feet.
.WEDNESDAY...West gales to 40 knots. Showers likely. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. A chance of rain
showers. Waves subsiding to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots becoming northeast 10 to
20 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots increasing to 15 to 25 knots.
A chance of rain showers. Waves building to 2 to 4 feet.

$$

LSZ263-201545-
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-
344 AM EDT Mon May 20 2024

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH LATE
WEDNESDAY NIGHT...

.EARLY THIS MORNING...Southeast winds less than 10 knots. A
slight chance of showers. Waves calm to 2 feet.
.TODAY...Northeast winds 5 to 15 knots veering east in the
afternoon, then backing northeast late. A chance of showers.
Waves calm to 2 feet.
.TONIGHT...Northeast winds less than 10 knots backing north after
midnight. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 15 to
25 knots. 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.
.TUESDAY NIGHT...East gales to 35 knots. Showers and a chance of
thunderstorms. Waves building to 8 to 11 feet occasionally to
14 feet.
.WEDNESDAY...Southwest gales to 35 knots veering west by mid
afternoon. Showers likely through early afternoon, then a chance
of showers by mid afternoon. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY NIGHT...West gales to 35 knots diminishing to 20 to
30 knots after midnight. A chance of rain showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 20 to 30 knots becoming east 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.

$$

LSZ264-201545-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
344 AM EDT Mon May 20 2024

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH LATE
WEDNESDAY NIGHT...

.EARLY THIS MORNING...East winds less than 10 knots. Waves calm
to 2 feet.
.TODAY...Southeast winds 5 to 15 knots backing east in the
afternoon. A chance of rain showers. Waves calm to 2 feet.
.TONIGHT...Northeast winds less than 10 knots backing northwest
after midnight, then veering north late. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots veering northeast in the
afternoon, then becoming east 10 to 20 knots late. A slight
chance of showers by mid afternoon. Waves building to 1 to
3 feet.
.TUESDAY NIGHT...East winds 20 to 30 knots increasing to gales to
35 knots after midnight. Showers and a chance of thunderstorms.
Waves building to 8 to 11 feet occasionally to 14 feet.
.WEDNESDAY...South gales to 35 knots veering west by mid
afternoon. Showers likely through early afternoon, then a chance
of showers by mid afternoon. Waves building to 9 to 12 feet
occasionally to 15 feet, then subsiding to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. A chance of rain
showers. Waves subsiding to 4 to 7 feet occasionally to 9 feet.
.THURSDAY...West winds 20 to 30 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots. A chance of rain showers. Waves building to 1 to
3 feet.

$$

LSZ265-201545-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
344 AM EDT Mon May 20 2024

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY
AFTERNOON...

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 5 to 15 knots backing east late. A chance of
showers. Waves calm to 2 feet.
.TONIGHT...Northeast winds 5 to 15 knots backing northwest after
midnight, then veering north late. A slight chance of rain
showers through midnight. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots veering east in the
afternoon, then increasing to 10 to 20 knots late. A slight
chance of showers by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 20 to 30 knots becoming southeast
gales to 40 knots after midnight. Showers and a chance of
thunderstorms. Waves building to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY...South gales to 40 knots veering southwest by mid
afternoon. A chance of showers. Waves subsiding to 3 to 5 feet
occasionally to 7 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. A chance of
showers. Waves 3 to 5 feet occasionally to 7 feet.
.THURSDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots veering southeast. A chance
of rain showers. Waves calm to 2 feet.

$$

LSZ266-201545-
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-
344 AM EDT Mon May 20 2024

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY
AFTERNOON...

.EARLY THIS MORNING...South winds 5 to 15 knots. Waves calm to
2 feet.
.TODAY...South winds 10 to 20 knots becoming southeast 5 to
15 knots late. A chance of showers. A slight chance of
thunderstorms by mid afternoon. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering northwest after
midnight, then veering north late. A slight chance of rain
showers through midnight. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots veering northeast in the
afternoon, then becoming east 10 to 20 knots late. A slight
chance of rain showers by mid afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 20 to 30 knots becoming southeast
gales to 40 knots after midnight. Showers and a chance of
thunderstorms. Waves building to 5 to 8 feet occasionally to
10 feet.
.WEDNESDAY...South gales to 40 knots becoming southwest gales to
35 knots by mid afternoon. A chance of showers. Waves building to
5 to 9 feet occasionally to 11 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. A chance of rain
showers. Waves subsiding to 5 to 8 feet occasionally to 10 feet.
.THURSDAY...West winds 15 to 25 knots becoming northwest 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.FRIDAY...Southeast winds 10 to 20 knots. A chance of rain
showers. Waves subsiding to calm to 2 feet.

$$

LSZ267-201545-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
344 AM EDT Mon May 20 2024

...GALE WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY
AFTERNOON...

.EARLY THIS MORNING...South winds 10 to 20 knots. Waves calm to
2 feet.
.TODAY...South winds 10 to 20 knots backing southeast in the
afternoon, then diminishing to 5 to 15 knots late. A chance of
showers. Waves calm to 2 feet.
.TONIGHT...Southeast winds 5 to 15 knots veering west after
midnight, then veering north late. A slight chance of
thunderstorms through midnight. A chance of rain showers. Waves
calm to 2 feet.
.TUESDAY...Northwest winds 5 to 15 knots veering north in the
afternoon, then becoming northeast 10 to 20 knots late. Waves
calm to 2 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots becoming southeast
gales to 40 knots after midnight. Showers and a chance of
thunderstorms. Waves building to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY...South gales to 35 knots veering southwest by mid
afternoon. A chance of showers. Waves 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots. A chance of rain
showers. Waves building to 4 to 7 feet occasionally to 9 feet.
.THURSDAY...West winds 20 to 30 knots becoming northwest 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.FRIDAY...Northwest winds 10 to 20 knots backing southeast. A
chance of rain showers. Waves subsiding to calm to 2 feet.

$$

LSZ261-201545-
MAFOR 2009/
Superior West 11300 11810 11200 13100 12800. A chance of showers
today. Waves 1 foot or less.

Superior North Central 12300 11200 11300 11200 11100 12700. A
chance of showers today. Waves 2 feet or less.

Superior South Central 13410 12310 11300 12700. A chance of
showers today. Waves 2 feet or less.

Superior East 13410 11310 12300 11500 11700. A chance of showers
this afternoon and evening. Waves 2 feet or less.

$$

GS

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

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