Good news: Deep freeze adds to Lake Superior's ice coverage

The lake was experiencing historically low ice coverage earlier this winter, but that all changed with the recent cold snap.
Author:
Publish date:
Ice on Lake Superior in Duluth on Jan. 31, 2021. 

Ice on Lake Superior in Duluth on Jan. 31, 2021. 

The recent cold snap is good news for Lake Superior. 

Ice coverage on Lake Superior skyrocketed over the past week, with 33% of the lake covered in ice as of Monday, according to the National Oceanic and Atmospheric Administration's (NOAA) Great Lakes Environmental Research Laboratory (GLERL). 

On Feb. 6, ice coverage on the lake was less than 6%

Here's a look from the International Space Station above Duluth and Lake Superior on Feb. 15:

Prior to this past week of arctic weather, the Great Lakes were nearing historic lows in terms of ice coverage, MPR News reported. In late January, only about 4% of Lake Superior was covered in ice, when the average that time of year is 20%.

The long-term average annual maximum ice cover on Lake Superior is 61.5%, NOAA says, with ice coverage fluctuating from year to year. 

Here's a look at maximum ice coverage the lake has seen in recent decades (here's a list of maximum percent coverage and the date it was achieved):

But in recent years, ice coverage on Lake Superior has seen extreme highs and lows. Last year, ice coverage on the lake maxed out at 22.6%, while in 2019 it reached 94.9%.

The problem with these extremes is that if Lake Superior sees multiple years of lower than average ice coverage it can have negative impacts on the lake's ecosystem. 

"At this time I'm not that worried, but if next year is another low ice year, the whole lake will warm up," Jia Wang, a NOAA Great Lakes Environmental Research Laboratory research scientist and ice climatologist told the Star Tribune in January. "What concerns me is if these kinds of lows continue for several years — that will have a bigger impact."

When there is less ice on the lake, the water absorbs more of the sun's rays, causing it to continue to warm – and Lake Superior's waters are already among the faster warming in the world. Warmer waters could make Superior more hospitable to invasive species, harm the lake's current ecosystem, and could create the right environment for harmful algae blooms, researchers have said. The lack of ice can also contribute to faster shore erosion.

So, although this past week of subzero, record-breaking cold did cause problems for Minnesotans, it was good for the lake. 

But even with the bitterly cold weather adding a significant amount of ice to Superior and other lakes, the National Weather Service in Duluth is reminding people that ice is never 100% safe. 

Related: 26 anglers rescued after Lake Superior ice sheet floats away in Duluth

In a tweet on Feb. 15, satellite images show ice breaking away from the Twin Ports as the wind shifted. 

Next Up

minneapolis police

Police arrest man in connection to deadly Minneapolis hit-and-run

The victim died the scene in north Minneapolis on Friday.

Jordan Greenway

Wild's fast start vanishes in loss to Coyotes

Arizona scored five unanswered goals in a 5-2 loss.

Screen Shot 2021-03-06 at 4.12.00 PM

Police seeking tips in search for road rage shooting suspect

The incident took place in Maplewood last week.

Paige Bueckers

Paige Bueckers lands on Wooden Award list for women's college basketball

The Hopkins grad is the only freshman on the 15-player ballot.

Jamal Mashburn Jr.

Gophers fall under .500 after OT loss to Rutgers

The Gophers are under .500 for the first time this season.

police tape, crime scene

Man arrested for killing of his father in Wabasha County

The 73-year-old man was found dead at a home in rural Zumbro Falls.

Jake Odorizzi

Report: Jake Odorizzi to sign with Astros

The former Twins pitcher is headed to Houston on a two-year deal.

Related

Report: Ice coverage on Lake Superior down 79 percent since 1973

According to an American Meteorological Society report, the amount of ice covering all the Great Lakes has dropped more than 70 percent over the past 40 winters. The Duluth News Tribune reports the study doesn't include the 2011-12 season. As of this winter, only about five percent of the Great Lakes froze. The lead researcher says a lack of ice coverage can reduce water levels, damage water quality and accelerate shoreline erosion.

ice rescue 4

26 anglers rescued after Lake Superior ice sheet floats away in Duluth

After multiple trips, all the anglers were safely rescued from the ice and brought to shore.

ice palace maze stillwater

A giant ice maze is coming to downtown Stillwater

It's believed to be the largest ice maze in the country.

frozen window cold winter

Deep freeze causes reports of frozen pipes, dead batteries

The bitter cold this past week set some records across the state.

Screen Shot 2021-02-22 at 10.48.03 AM

Apostle Islands ice caves will remain closed this winter

The recent deep freeze wasn't enough to provide safe ice conditions.

MN Nice Homes: A modern masterpiece on Lake Superior

The $4 million compound is surrounded by dramatic wilderness.