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Ice Circles / Discs / Disks

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Fortea Morgana :) PeteByrdie certificated Princess
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EnolaGaia

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Here's a recent summary of ice circles and how they form ...
The Science Behind Snow Rollers, Ice Circles and Other Winter Phenomena ...

Ice Circles


Often spotted on lakes, ponds, rivers and other slow-moving bodies of water, ice circles look like frost-coated lily pads floating on the water’s surface. In actuality, ice circles occur when moving water forces ice to slowly rotate. “What’s happening here is shear—when on one side of the ice you have water that’s moving faster than on the other side causing the ice to rotate,” Jackson says. “The result is an eddy current, like a whirlpool.” The meteorologist explains that there are two ways for ice circles to form. The first happens when there’s ice in a stationary area but a change in water speed due to a topographic force, such as a bend in a river, causes the ice to rotate until it forms the shape of a circle. The other instance occurs when a hunk of ice breaks off of an ice sheet that’s located in a rotation zone. “The water surrounding it will cause it to rotate, naturally forming into a circle as any pointy edges start to grind down as they brush against the surrounding ice,” he says.

Where to see ice circles: While the Westbrook circle stands out for its magnificence, most ice circles are only a fraction of its size and crop up on the surface of lakes, ponds and rivers in areas known for reaching frigid temperatures in the winter, such as Canada, the northern United States and Scandinavia.
FULL STORY: https://www.smithsonianmag.com/trav...ice-circles-other-winter-phenomena-180973946/
 

EnolaGaia

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According to this short video, it's similar to car manufacturer AION's logo & is a publicity stunt.. ...

Yep ... It's clearly artificial and not an example of the natural phenomenon.
 

EnolaGaia

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Last year's huge ice circle on the Presumpscot River (Maine) appears to be re-emerging this winter.
Coming around again: Famous ice disk seems to be re-forming

An ice disk appears to be forming in the same Maine river where an unusually large one formed last winter and quickly gained international fame.

The City of Westbrook tweeted an aerial view of the disk in the Presumpscot River with the message: “ICE BREAKING NEWS: Ice Disk 2020 is making a run for it...It’s not a perfect circle yet, but it is rotating counter-clockwise again & the seagulls are along for the ride.” ...

The ice formation comes just about a year after a disk measuring about 100 yards (91 meters) was spotted in the Presumpscot River. It eventually had a devoted webcam; social media users compared it to an alien spacecraft and the moon; and ducks used it as a raft.

A video of the disk shows a nascent ice blob that is thinner and less circular than the famous disk of 2019. ...
FULL STORY (With Photo): https://apnews.com/ec1296f0492c0488ae8b69907735be98
 

EnolaGaia

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'Ice pancakes' and 'ice balls' are forming in Manitoba. This news article illustrates these latest examples and provides explanations for how they form.

ice-pancakes.jpg

'Rounded pancake shapes': Another unique ice formation spotted on Manitoba waters

From ice balls to now ice pancakes, water in Manitoba is showing the unique shapes it can make.
Ice pancakes have been spotted at Winnipeg Beach and at York Landing.

Greg McCullough, a geographer at the University of Manitoba, said the formations are created when ice crystals start gatherings in little groups on the water's surface in slightly wavy conditions.
"They'll tend to grow outwards in roughly a circle, and then gradually the ice will form up and these groups will be jostling around together. So they will rock around and they will knock any rough edges off and you end up with a whole lot of fairly rounded pancake shapes," said McCullough.

Ice balls have also been found in the province on Lake Manitoba. ...

Experts says snowflakes freezing on top of the water, mixed with waves or wind can cause everything to turn and create snowball shapes. ...
FULL STORY (With Video & More Photos): https://winnipeg.ctvnews.ca/rounded...ormation-spotted-on-manitoba-waters-1.5680565
 

EnolaGaia

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Presumpscot River, Maine, USA. ~91m diameter. Typical Americans, have to supersize everything. ...

The Presumpscot River ice circle / disk has made a 2022 appearance following a relatively disappointing 2020 / 2021 winter season.

WestbrookME-IceCircle-2022.jpeg
Back in shape: Maine’s famous spinning ice disk says hello

Maine’s famous rotating ice disk is back.

The disk has begun to form in the Presumpscot River, where it partially formed in 2020 but failed to draw a worldwide audience like in its first appearance in 2019.

Westbrook city officials shared photos of the formation Wednesday on Facebook, encouraging residents to share more images of the disk while it’s still around. ...

Three years ago, a 100-yard-wide (91 meters) ice formation appeared in the river for the first time and brought international attention to Westbrook before it dissipated with the advent of warmer weather.
FULL STORY: https://apnews.com/article/oddities-environment-and-nature-maine-aa2de93b8645c7891748e64fc88957c2
 

maximus otter

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Mysterious ice formations showed up in Chicago this week


You've heard of blizzards and maybe even the polar vortex, but have you heard of ice pancakes? What about ice bites or ice jams? These unique names sound fascinating but require specific weather conditions.

iu


This week ice pancakes were found along Chicago's shoreline of Lake Michigan.

Sharan Banagiri's photos were taken at Loyola Beach at Rogers Park about 10 miles north of downtown.

Banagiri [said that] these photos were taken on a walkway on the way to a lighthouse. Banagiri noted that the temperature at the time the photos were taken was around -6 degrees Celsius (21 degree Fahrenheit).

https://edition.cnn.com/2022/01/22/weather/midwest-chicago-lake-michigan-ice-pancakes/index.html

maximus otter
 

Mythopoeika

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Someone in an online group posted this photo for identification. I don't think I have seen this style before.
I'm going to hazard a guess that those are caused by a bird landing, then breaking the thin ice.
 

maximus otter

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Ice pancakes appeared on a Scottish river due to an unusual cold snap

A couple of days ago, slushy ice circles, also known as ice pancakes, were seen on the River Bladnoch in Galloway’s surface due to a cold snap in the United Kingdom. Callum Sinclair, the project manager for the Scottish Invasive Species Initiative (SISI), discovered spectacular circular sheets of ice.

HadyhssQQmg3DSf5TLZyuigZbPoHh42m0AkEfw1W.jpg


The phrase "pancake ice" is used to describe usually circular ice formations that are up to 10 cm (4 inches) thick and 30 cm (12 inches) broad. The rimmed edges of pancake ice pieces are frequently raised due to repeated impact with other ice, which is how pancake ice is typically organized. The buildup of slush and frazil ice, a collection of ice crystals that form on moving water, also helps explain why pancake ice has elevated edges.

https://interestingengineering.com/science/ice-pancakes-scottish-river

maximus otter
 

maximus otter

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Not quite the same, but interesting:

Polka dot surprise: 'Rare' pattern of air pockets pop up in Utah school lot

The Whittier Elementary School playground in Utah was peppered with unusual white polka dots on Wednesday.

Chris Herrmann arrived at the school for work one chilly January morning when he came across the bizarre sight.

1135cc7ff4155933594d799d7b444a04


Thousands of white polka dots covered the black asphalt playground, which was covered in ice that had formed after a rainstorm had swept through the previous night.

The "dots" were air pockets that had formed underneath the ice.

According to meteorologist Marissa Lautenbacher, air pockets like these form when cold water from freezing rain fills the nooks and crannies of the asphalt. The air that had occupied those nooks and crannies is then pushed out.

Since the cold rain freezes as soon as it makes contact with the asphalt, Lautenbacher noted, the air bubbles that are being pushed out of the asphalt don’t have enough time to escape into the open air. This causes the tiny air bubbles to collect, eventually forming larger air pockets under the ice as they try to escape.

https://news.yahoo.com/polka-dot-surprise-rare-pattern-000656442.html

maximus otter
 
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