Great Lakes Forecast
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FZUS63 KMQT 140158
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
958 PM EDT Wed Mar 13 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 29.9 inch trough over southern Ontario slowly moves
east toward New England through tonight, weakening to 30.0 inches
by Thursday morning. Behind the trough, 30.2 inch ridging builds
southeast from northern Manitoba, reaching the Upper Great Lakes.
On Thursday, Lake Superior will be between 30.3 inch ridging over
northern Ontario and a 29.8 inch low approaching southern Lake
Michigan. The ridge will remain overhead Friday, but weaken Friday
night to 30.0 inches while the low approaches the Northeast U.S.
at 29.7 inches. Friday night, a 29.4 inch Alberta Clipper low will
approach Lake Superior, passing north of the lake on Saturday,
and continuing eastward into Quebec Saturday night into Sunday.
By Sunday evening, a 30.4 inch high will be over Manitoba.


LSZ162-141000-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
958 PM EDT Wed Mar 13 2024 /858 PM CDT Wed Mar 13 2024/

.REST OF TONIGHT...Northeast winds 5 to 15 knots increasing to
15 to 25 knots. Waves calm to 2 feet building to 2 to 4 feet.
.THURSDAY...Northeast winds 15 to 25 knots becoming east 10 to
20 knots late. Waves building to 3 to 5 feet occasionally to
7 feet.
.THURSDAY NIGHT...Northeast winds 5 to 15 knots backing north
after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots becoming west
20 to 30 knots after midnight. A chance of rain showers. Waves
building to 4 to 7 feet occasionally to 9 feet, then subsiding to
3 to 6 feet occasionally to 8 feet.
.SATURDAY...West gales to 35 knots veering northwest by mid
afternoon. A chance of rain showers, possibly mixed with snow.
Waves building to 5 to 8 feet occasionally to 10 feet.
.SATURDAY NIGHT...Northwest gales to 35 knots diminishing to
20 to 30 knots after midnight. A chance of snow showers. Waves
subsiding to 2 to 4 feet.
.SUNDAY...North winds 15 to 25 knots. Waves 2 to 4 feet.
.MONDAY...Northwest winds 15 to 25 knots diminishing to 10 to
20 knots. Waves subsiding to calm to 2 feet.

$$

LSZ263-141000-
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-
958 PM EDT Wed Mar 13 2024

.REST OF TONIGHT...Northeast winds 5 to 15 knots increasing to
10 to 20 knots late. Waves calm to 2 feet building to 1 to
3 feet.
.THURSDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then diminishing to 10 to 20 knots
late. Waves building to 3 to 5 feet occasionally to 7 feet.
.THURSDAY NIGHT...Northeast winds 10 to 20 knots backing north
after midnight, then diminishing to 5 to 15 knots late. Waves
subsiding to 1 to 3 feet.
.FRIDAY...West winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet,
then building to 2 to 4 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots. A chance of rain
showers, possibly mixed with snow. Waves building to 4 to 7 feet
occasionally to 9 feet.
.SATURDAY...West winds 20 to 30 knots. A chance of rain showers.
A chance of snow showers by mid afternoon. Waves building to 5 to
8 feet occasionally to 10 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots veering north
after midnight. A chance of rain showers through midnight. A
chance of snow showers. Waves subsiding to 3 to 6 feet
occasionally to 8 feet.
.SUNDAY...North winds 15 to 25 knots. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.MONDAY...North winds 10 to 20 knots becoming northwest 5 to
15 knots. Waves subsiding to calm to 2 feet.

$$

LSZ264-141000-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
958 PM EDT Wed Mar 13 2024

.REST OF TONIGHT...North winds 5 to 15 knots veering northeast
after midnight, then increasing to 10 to 20 knots late. Waves
calm to 2 feet building to 2 to 4 feet.
.THURSDAY...Northeast winds 10 to 20 knots. Waves building to
2 to 4 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots veering northeast
after midnight, then diminishing to 5 to 15 knots late. Waves
subsiding to 1 to 3 feet, then building to 2 to 4 feet.
.FRIDAY...North winds 5 to 15 knots becoming southwest 10 to
20 knots by mid afternoon. Waves subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.FRIDAY NIGHT...Southwest winds 15 to 25 knots. Rain showers
likely after midnight. Waves building to 4 to 7 feet occasionally
to 9 feet.
.SATURDAY...West winds 20 to 30 knots veering northwest by mid
afternoon. A chance of rain showers. Waves building to 5 to
8 feet occasionally to 10 feet.
.SATURDAY NIGHT...Northwest winds 20 to 30 knots veering north
after midnight. Waves building to 6 to 9 feet occasionally to
11 feet.
.SUNDAY...North winds 20 to 30 knots. Freezing spray. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY...North winds 15 to 25 knots diminishing to 10 to
20 knots. Freezing spray. Waves subsiding to 1 to 3 feet.

$$

LSZ265-141000-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
958 PM EDT Wed Mar 13 2024

.REST OF TONIGHT...Northwest winds 5 to 15 knots veering north
after midnight, then becoming northeast 10 to 20 knots late.
Waves calm to 2 feet building to 1 to 3 feet.
.THURSDAY...Northeast winds 10 to 20 knots backing north late.
Waves building to 2 to 4 feet.
.THURSDAY NIGHT...North winds 10 to 20 knots. Waves 2 to 4 feet.
.FRIDAY...North winds 10 to 20 knots becoming west 5 to 15 knots
by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 5 to 15 knots becoming southwest
15 to 25 knots after midnight. A chance of rain showers after
midnight. Waves building to 2 to 4 feet.
.SATURDAY...West winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. A chance of rain showers, possibly
mixed with snow. Waves building to 3 to 6 feet occasionally to
8 feet.
.SATURDAY NIGHT...Northwest gales to 35 knots. A chance of rain
showers through midnight. A chance of snow showers. Waves
building to 5 to 8 feet occasionally to 10 feet.
.SUNDAY...North gales to 35 knots diminishing to 20 to 30 knots.
Freezing spray. Waves subsiding to 4 to 7 feet occasionally to
9 feet.
.MONDAY...Northwest winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray. Waves subsiding to calm to 2 feet.

$$

LSZ266-141000-
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-
958 PM EDT Wed Mar 13 2024

.REST OF TONIGHT...Northwest winds 5 to 15 knots becoming north
10 to 20 knots after midnight, then veering northeast late. Waves
1 to 3 feet subsiding to calm to 2 feet, then building to 2 to
4 feet.
.THURSDAY...Northeast winds 10 to 20 knots increasing to 15 to
25 knots in the afternoon, then backing north late. Waves
building to 2 to 4 feet.
.THURSDAY NIGHT...North winds 15 to 25 knots veering northeast
after midnight, then diminishing to 10 to 20 knots late. Waves
building to 3 to 5 feet occasionally to 7 feet, then subsiding to
2 to 4 feet.
.FRIDAY...North winds 10 to 20 knots becoming west 5 to 15 knots
by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...South winds 10 to 20 knots becoming southwest
15 to 25 knots after midnight. A chance of rain showers after
midnight. Waves building to 4 to 7 feet occasionally to 9 feet.
.SATURDAY...West winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. A chance of rain showers. Waves
building to 7 to 10 feet occasionally to 13 feet.
.SATURDAY NIGHT...Northwest gales to 40 knots becoming north
gales to 35 knots after midnight. A chance of rain and snow
showers. Waves building to 7 to 11 feet occasionally to 14 feet.
.SUNDAY...North gales to 35 knots. A chance of snow showers.
Freezing spray. Waves subsiding to 5 to 8 feet occasionally to
10 feet.
.MONDAY...North winds 20 to 30 knots becoming northwest 15 to
25 knots. Freezing spray. Waves subsiding to 2 to 4 feet.

$$

LSZ267-141000-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
958 PM EDT Wed Mar 13 2024

.REST OF TONIGHT...Northwest winds 10 to 20 knots veering
northeast late. Waves 1 to 3 feet subsiding to calm to 2 feet,
then building to 1 to 3 feet.
.THURSDAY...Northeast winds 10 to 20 knots becoming north 15 to
25 knots late. Waves building to 2 to 4 feet, then subsiding to
1 to 3 feet.
.THURSDAY NIGHT...Northeast winds 15 to 25 knots diminishing to
10 to 20 knots late. Waves subsiding to 1 to 3 feet.
.FRIDAY...North winds 10 to 20 knots backing northwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...Southwest winds 10 to 20 knots becoming south
15 to 25 knots after midnight. A chance of rain showers after
midnight. Waves building to 3 to 6 feet occasionally to 8 feet.
.SATURDAY...West winds 20 to 30 knots increasing to gales to
35 knots by mid afternoon. Rain showers likely through early
afternoon. A chance of rain showers by mid afternoon. Waves
building to 7 to 10 feet occasionally to 13 feet.
.SATURDAY NIGHT...Northwest gales to 40 knots. A chance of rain
and snow showers. Waves building to 8 to 11 feet occasionally to
14 feet, then subsiding to 6 to 9 feet occasionally to 11 feet.
.SUNDAY...North winds 20 to 30 knots. Freezing spray. Waves
subsiding to 3 to 6 feet occasionally to 8 feet.
.MONDAY...North winds 20 to 30 knots diminishing to 15 to
25 knots. Freezing spray. Waves subsiding to 2 to 4 feet.

$$
LSZ261-141000-
MAFOR 1403/
Superior West 11110 11220 11120 13130 11220 11110. Waves 1 foot
or less building to 2 to 3 feet overnight. Waves 3 to 5 feet
Thursday. Waves 2 to 4 feet Thursday evening.

Superior North Central 11820 14120 11120 12820. Waves 1 to 3 feet
overnight. Waves 2 to 4 feet Thursday and Thursday evening.

Superior South Central 12810 14120 12820. Waves 1 to 3 feet
overnight. Waves 2 to 4 feet Thursday and Thursday evening.

Superior East 11810 14120 11120 11830 11130. Waves 2 to 4 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


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