334
FZUS63 KMQT 200151
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
951 PM EDT Sun May 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 29.7 inch low pressure system will lift northeast
into southeastern Minnesota tonight, then shift east across the
Upper Great Lakes Monday afternoon and evening. A period of weak
29.9 inch ridging follows for late Monday night into Tuesday
morning over Lake Superior. Another 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.

LSZ162-201000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
951 PM EDT Sun May 19 2024 /851 PM CDT Sun May 19 2024/

.REST OF TONIGHT...South winds 5 to 15 knots backing east late. A
chance of showers after midnight. Waves calm to 2 feet.
.MONDAY...East winds 10 to 20 knots backing northeast in the
afternoon. A chance of showers. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.TUESDAY...Northeast winds 10 to 20 knots increasing to 20 to
30 knots by mid afternoon. A chance of rain showers. A slight
chance of thunderstorms by mid afternoon. Waves building to 7 to
10 feet occasionally to 13 feet.
.TUESDAY NIGHT...Northeast gales to 35 knots. Showers and a
chance of thunderstorms. Waves building to 10 to 14 feet
occasionally to 18 feet.
.WEDNESDAY...North gales to 35 knots backing west by mid
afternoon. Showers likely. Waves subsiding to 6 to 9 feet
occasionally to 11 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of rain showers. Waves
subsiding to 2 to 4 feet.
.THURSDAY...West winds 15 to 25 knots becoming north 10 to
20 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...East winds 10 to 20 knots backing northeast. A chance
of rain showers, then rain showers likely. Waves building to 1 to
3 feet.

$$

LSZ263-201000-
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-
951 PM EDT Sun May 19 2024

.REST OF TONIGHT...Southwest winds 5 to 15 knots backing
southeast late. A slight chance of showers after midnight. Waves
1 to 3 feet subsiding to calm to 2 feet.
.MONDAY...East winds 5 to 15 knots backing northeast late. A
chance of showers. A slight chance of thunderstorms by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...Northeast winds 5 to 15 knots backing north after
midnight. Waves calm to 2 feet.
.TUESDAY...Northeast winds 5 to 15 knots increasing to 15 to
25 knots by mid afternoon. A chance of rain showers and a slight
chance of thunderstorms by mid afternoon. Waves building to 3 to
6 feet occasionally to 8 feet.
.TUESDAY NIGHT...Northeast winds 20 to 30 knots becoming east
gales to 35 knots after midnight. Showers and a chance of
thunderstorms. Waves building to 9 to 12 feet occasionally to
15 feet.
.WEDNESDAY...Southwest winds 20 to 30 knots veering west by mid
afternoon. Showers likely. Waves subsiding to 6 to 9 feet
occasionally to 11 feet, then building to 7 to 10 feet
occasionally to 13 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing east. A chance of
rain showers. Waves building to 1 to 3 feet.

$$

LSZ264-201000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
951 PM EDT Sun May 19 2024

.REST OF TONIGHT...Southwest winds 5 to 15 knots becoming south
less than 10 knots late. Waves 1 to 3 feet subsiding to calm to
2 feet.
.MONDAY...Southeast winds 5 to 15 knots backing east in the
afternoon. A chance of rain showers. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots becoming north less than
10 knots after midnight, then increasing to 5 to 15 knots late.
Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. A slight chance of rain 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 likely through midnight. A
chance of thunderstorms. Showers after midnight. Waves building
to 9 to 12 feet occasionally to 15 feet.
.WEDNESDAY...Southeast winds 20 to 30 knots veering west by mid
afternoon. Showers likely. Waves building to 10 to 14 feet
occasionally to 18 feet, then subsiding to 7 to 10 feet
occasionally to 13 feet.
.WEDNESDAY NIGHT...West winds 15 to 25 knots. A chance of rain
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 5 to
15 knots. Waves subsiding to calm to 2 feet.
.FRIDAY...South winds 5 to 15 knots backing southeast. A chance
of rain showers. Waves calm to 2 feet.

$$

LSZ265-201000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
951 PM EDT Sun May 19 2024

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

$$

LSZ266-201000-
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-
951 PM EDT Sun May 19 2024

.REST OF TONIGHT...South winds 5 to 15 knots. Waves 1 to 3 feet
subsiding to calm to 2 feet.
.MONDAY...Southeast winds 5 to 15 knots increasing to 10 to
20 knots in the afternoon, then backing east late. Showers
through early afternoon, then a chance of showers and a slight
chance of thunderstorms by mid afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 5 to 15 knots backing north after
midnight. A slight chance of thunderstorms through midnight. A
chance of rain showers. Waves calm to 2 feet.
.TUESDAY...North winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. A chance of rain showers by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 15 to 25 knots becoming southeast
20 to 30 knots after midnight. Showers and a chance of
thunderstorms. Waves building to 6 to 9 feet occasionally to
11 feet.
.WEDNESDAY...South winds 20 to 30 knots veering southwest by mid
afternoon. A chance of thunderstorms through early afternoon. A
chance of showers. Waves building to 6 to 10 feet occasionally to
13 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of rain showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to 1 to 3 feet.
.FRIDAY...West winds 10 to 20 knots backing southeast. A chance
of rain showers. Waves subsiding to calm to 2 feet.

$$

LSZ267-201000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
951 PM EDT Sun May 19 2024

.REST OF TONIGHT...South winds 5 to 15 knots. Waves calm to
2 feet.
.MONDAY...Southeast winds 10 to 20 knots backing east late. A
chance of showers. A slight chance of thunderstorms by mid
afternoon. Waves calm to 2 feet.
.MONDAY NIGHT...East winds 10 to 20 knots becoming north 5 to
15 knots after midnight, then backing northwest late. A chance of
rain showers and a slight chance of thunderstorms. Waves calm to
2 feet.
.TUESDAY...Northwest winds 5 to 15 knots becoming northeast 10 to
20 knots by mid afternoon. A slight chance of showers by mid
afternoon. Waves calm to 2 feet.
.TUESDAY NIGHT...East winds 10 to 20 knots becoming southeast
20 to 30 knots after midnight. Showers and a chance of
thunderstorms. Waves building to 3 to 6 feet occasionally to
8 feet.
.WEDNESDAY...South winds 20 to 30 knots veering southwest by mid
afternoon. Showers likely and a chance of thunderstorms through
early afternoon, then a chance of showers by mid afternoon. Waves
building to 5 to 8 feet occasionally to 10 feet.
.WEDNESDAY NIGHT...West winds 20 to 30 knots diminishing to 15 to
25 knots after midnight. A chance of rain showers. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.THURSDAY...West winds 15 to 25 knots diminishing to 10 to
20 knots. A chance of rain showers. Waves subsiding to 1 to
3 feet.
.FRIDAY...West winds 10 to 20 knots backing southeast. A chance
of rain showers. Waves subsiding to calm to 2 feet.

$$
LSZ261-201000-
MAFOR 2003/
Superior West 11400 11300 11200 11216 11210 12110 11210. Waves 2
feet or less.

Superior North Central 11510 12400 11300 11310 12210 11200. A
chance of showers Monday. Waves 1 to 3 feet.

Superior South Central 13400 11306 11316 11310 11210 11200. Waves
1 foot or less.

Superior East 13400 11300 11316 11216 12210. Waves 1 to 2 feet.

$$

WFO MQT

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

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