Great Lakes Forecast
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FZUS63 KMQT 270819
GLFLS

Open Lake Forecast for Lake Superior
National Weather Service Marquette MI
419 AM EDT Wed Mar 27 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 29.3 inch low pressure currently just north of Lake
Superior into Ontario will continue to lift north through Ontario
today reaching the shores of Hudson Bay at 29.4 inches later this
evening as 30.2 inch ridging builds over much of the central
CONUS. Thursday, the pressure gradient slackens as ridging to the
south and west weakens to 30.1 inches and the low over Hudson Bay
weakens to 29.6 inches. Friday, a 30.0 inch ridge builds over the
lake associated with a 30.2 inch high over the northern Canadian
Prairie provinces. Friday night, 30.0 inch ridging holds over the
lake as a 29.7 inch low approaches the southern portions of the
Great Lakes basin. As the low enters the Lower Great Lakes on
Saturday, a 30.3 inch ridge over northern Manitoba will extend a
30.1 inch ridge over Lake Superior late weekend into early next
week.

LSZ162-271630-
Lake Superior west of a line from Saxon Harbor WI to Grand
Portage MN beyond 5NM-
419 AM EDT Wed Mar 27 2024 /319 AM CDT Wed Mar 27 2024/

...GALE WARNING IN EFFECT THROUGH THIS EVENING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 2 PM EDT /1 PM
CDT/ THIS AFTERNOON...

.EARLY THIS MORNING...West winds 20 to 30 knots. Freezing spray.
Scattered snow showers. Waves 3 to 6 feet occasionally to 8 feet.
.TODAY...West winds 20 to 30 knots increasing to gales to
35 knots late. Heavy freezing spray. Scattered snow showers.
Waves building to 5 to 8 feet occasionally to 10 feet.
.TONIGHT...West gales to 35 knots diminishing to 20 to 30 knots
late. Freezing spray. Scattered snow showers. Waves subsiding to
4 to 7 feet occasionally to 9 feet.
.THURSDAY...West winds 20 to 30 knots. Freezing spray through
early afternoon. Waves subsiding to 3 to 5 feet occasionally to
7 feet.
.THURSDAY NIGHT...Northwest winds 10 to 20 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to calm to 2 feet.
.FRIDAY...Northwest winds 5 to 15 knots becoming east 10 to
20 knots by mid afternoon. Waves building to 2 to 4 feet.
.FRIDAY NIGHT...East winds 10 to 20 knots increasing to 15 to
25 knots after midnight. A chance of snow through midnight. A
chance of rain. Snow likely after midnight. Waves 2 to 4 feet.
.SATURDAY...Northeast winds 15 to 25 knots becoming northwest
10 to 20 knots. A chance of snow. Waves subsiding to calm to
2 feet.
.SUNDAY...Northwest winds 10 to 20 knots veering northeast. Waves
calm to 2 feet.

$$

LSZ263-271630-
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-
419 AM EDT Wed Mar 27 2024

...GALE WARNING IN EFFECT THROUGH THIS EVENING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 2 PM EDT THIS
AFTERNOON...

.EARLY THIS MORNING...West winds 20 to 30 knots. Freezing spray.
Scattered snow showers. Waves 4 to 8 feet occasionally to
10 feet.
.TODAY...West winds 20 to 30 knots increasing to gales to
35 knots in the afternoon. Heavy freezing spray. Scattered snow
showers through early afternoon. Numerous snow showers by mid
afternoon. Waves building to 7 to 10 feet occasionally to 13 feet.
.TONIGHT...West gales to 35 knots diminishing to 20 to 30 knots
after midnight. Freezing spray. Snow showers. Waves building to
7 to 11 feet occasionally to 14 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Freezing spray through early
afternoon. Scattered snow showers through early afternoon. Waves
subsiding to 4 to 7 feet occasionally to 9 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
5 to 15 knots after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...Northwest winds 5 to 15 knots backing southwest by mid
afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of snow, possibly mixed with
rain. Waves building to 1 to 3 feet.
.SATURDAY...East winds 10 to 20 knots becoming northwest 5 to
15 knots. A chance of snow. Waves subsiding to calm to 2 feet.
.SUNDAY...Northwest winds 5 to 15 knots veering northeast. Waves
calm to 2 feet.

$$

LSZ264-271630-
Lake Superior from Upper Entrance to Portage Canal to Manitou
Island MI 5NM off shore to the US/Canadian Border-
419 AM EDT Wed Mar 27 2024

...GALE WARNING IN EFFECT THROUGH THIS EVENING...
...HEAVY FREEZING SPRAY WARNING IN EFFECT UNTIL 2 PM EDT THIS
AFTERNOON...

.EARLY THIS MORNING...West winds 20 to 30 knots. Freezing spray.
Isolated snow showers. Waves 4 to 7 feet occasionally to 9 feet.
.TODAY...West winds 20 to 30 knots increasing to gales to
35 knots late. Heavy freezing spray. Scattered snow showers.
Waves building to 7 to 10 feet occasionally to 13 feet.
.TONIGHT...West gales to 35 knots early, then winds 20 to 30
knots. Freezing spray. Numerous snow showers. Waves 7 to 10 feet
occasionally to 13 feet.
.THURSDAY...West wind 20 to 30 knots, then winds diminishing to
15 to 25 knots in the afternoon. Freezing spray through early
afternoon. Scattered snow showers. Waves subsiding to 4 to 7 feet
occasionally to 9 feet.
.THURSDAY NIGHT...Northwest winds 15 to 25 knots diminishing to
10 to 20 knots after midnight. Waves subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 10 to 20 knots becoming west 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of snow. Waves calm to 2 feet.
.SATURDAY...East winds 5 to 15 knots backing north. A chance of
snow. Waves building to 1 to 3 feet, then subsiding to calm to
2 feet.
.SUNDAY...Northwest winds 5 to 15 knots veering northeast. Waves
calm to 2 feet.

$$

LSZ265-271630-
Lake Superior West of Line from Manitou Island to Marquette MI
Beyond 5NM from shore-
419 AM EDT Wed Mar 27 2024

...GALE WARNING IN EFFECT THROUGH THIS AFTERNOON...

.EARLY THIS MORNING...West gales to 35 knots. Freezing spray.
Isolated snow showers. Waves 4 to 7 feet occasionally to 9 feet.
.TODAY...West gales to 35 knots. Freezing spray. Scattered snow
showers. Waves subsiding to 3 to 6 feet occasionally to 8 feet,
then building to 4 to 7 feet occasionally to 9 feet.
.TONIGHT...West winds 20 to 30 knots. Snow showers. Freezing
spray after midnight. Waves 4 to 7 feet occasionally to 9 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots late. Scattered snow showers. Waves subsiding to 3 to
6 feet occasionally to 8 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots becoming northwest
10 to 20 knots after midnight. Waves subsiding to 1 to 3 feet.
.FRIDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to calm to 2 feet.
.FRIDAY NIGHT...East winds 5 to 15 knots increasing to 10 to
20 knots after midnight. A chance of snow, possibly mixed with
rain. Waves calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots backing northwest. A chance
of snow. Waves calm to 2 feet.
.SUNDAY...Northwest winds 10 to 20 knots veering northeast. Waves
calm to 2 feet.

$$

LSZ266-271630-
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-
419 AM EDT Wed Mar 27 2024

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

.EARLY THIS MORNING...West gales to 35 knots. Freezing spray.
Scattered snow showers. Waves 6 to 9 feet occasionally to
11 feet.
.TODAY...West gales to 35 knots. Freezing spray. Scattered snow
showers. Waves building to 8 to 11 feet occasionally to 14 feet.
.TONIGHT...West winds 20 to 30 knots increasing to gales to
35 knots after midnight. Scattered snow showers through midnight,
then snow showers after midnight. Waves subsiding to 7 to 10 feet
occasionally to 13 feet.
.THURSDAY...West winds 20 to 30 knots diminishing to 15 to
25 knots in the afternoon. Numerous snow showers through early
afternoon, then scattered snow showers by mid afternoon. Waves
subsiding to 5 to 8 feet occasionally to 10 feet.
.THURSDAY NIGHT...West winds 15 to 25 knots veering northwest
after midnight. Isolated snow showers through midnight. Waves
subsiding to 2 to 4 feet.
.FRIDAY...Northwest winds 10 to 20 knots diminishing to 5 to
15 knots by mid afternoon. Waves subsiding to 1 to 3 feet.
.FRIDAY NIGHT...Northeast winds 5 to 15 knots becoming east 10 to
20 knots after midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots backing northwest. A chance
of snow. Waves building to 1 to 3 feet.
.SUNDAY...Northwest winds 10 to 20 knots veering north. Waves
subsiding to calm to 2 feet.

$$

LSZ267-271630-
Lake Superior from Grand Marais MI to Whitefish Point MI 5NM off
shore to the US/Canadian border-
419 AM EDT Wed Mar 27 2024

.EARLY THIS MORNING...West winds 20 to 30 knots. Scattered snow
showers. Waves 6 to 9 feet occasionally to 11 feet.
.TODAY...West winds 20 to 30 knots. Scattered snow showers. Waves
building to 6 to 10 feet occasionally to 13 feet.
.TONIGHT...West winds 20 to 30 knots becoming southwest to
30 knots with a few gale force gusts to 35 knots possible after
midnight. Scattered snow showers. Waves building to 7 to 10 feet
occasionally to 13 feet.
.THURSDAY...West winds to 30 knots with a few gale force gusts to
35 knots possible diminishing to 20 to 30 knots in the afternoon.
Numerous snow showers through early afternoon, then scattered
snow showers by mid afternoon. Waves subsiding to 5 to 8 feet
occasionally to 10 feet.
.THURSDAY NIGHT...West winds 20 to 30 knots becoming northwest
10 to 20 knots after midnight. Scattered snow showers. Waves
subsiding to 3 to 5 feet occasionally to 7 feet.
.FRIDAY...Northwest winds 10 to 20 knots. Waves subsiding to 1 to
3 feet.
.FRIDAY NIGHT...North winds 10 to 20 knots veering east after
midnight. Waves subsiding to calm to 2 feet.
.SATURDAY...East winds 10 to 20 knots backing northwest. A chance
of snow, possibly mixed with rain. Waves building to 1 to 3 feet.
.SUNDAY...Northwest winds 10 to 20 knots veering north. Waves
subsiding to calm to 2 feet.

$$

LSZ261-271630-
MAFOR 2709/
Superior West...GALE WARNING AND HEAVY FREEZING SPRAY WARNING IN
EFFECT...12642 19647 11652 19657 12657 11650 19657 11640 19647
11641 19647. Waves 3 to 6 feet building to 6 to 9 feet today.
Waves 5 to 9 feet tonight.

Superior North Central...GALE WARNING AND HEAVY FREEZING SPRAY
WARNING IN EFFECT...12642 11642 19647 11650 19657 11657 11647
11641 19647 11647. Waves 5 to 8 feet building to 7 to 10 feet
today. Waves 6 to 10 feet tonight.

Superior South Central...GALE WARNING IN EFFECT...11651 14651
19657 11640 19647 12647. Waves 5 to 8 feet.

Superior East...GALE WARNING IN EFFECT...11640 19647 11540 19547
11550 19557 11650 19657 12640 19647 12540 19547. Waves 6 to 10
feet today. Waves 7 to 11 feet tonight.

$$

Voss

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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