Lauren Mitchell posted this photo so-called “fallstreak cloud” or “hole punch cloud,” formally known as a cavum, that appeared over Chilliwack on Dec. 9, 2019. (Facebook)

Bizarre ‘hole punch cloud’ forms over Chilliwack

Several people posted images of the odd formation, which is scientifically known as a cavum

No, it wasn’t aliens.

Several people posted photos of a bizarre cloud formation over Chilliwack on Monday. What appeared as a giant hole in a flat, thin cloud is what’s known as a “fallstreak cloud” or “hole punch cloud.”

(See below for more photos.)

But the formal name of the cloud formation, which was added to the 2017 version of the International Cloud Atlas is a “cavum,” according to an article on The Weather Network from that year.

“This supplemental feature is caused when ice crystals are introduced into a thin cloud comprised of super-cooled water droplets, usually due to an aircraft passing through the cloud on takeoff or landing,” according to meteorologist and science writer Scott Sutherland. “With the sudden appearance of the ice crystals, the water droplets in the vicinity all rush in – creating a clear spot in the cloud – where they freeze and grow the crystals into snowflakes, which then fall out of the sky.”

The cloud also included a wispy feature below it, almost appearing like a tornado, which is a shaft of precipitation produced by the falling snow.

A similar cavum was seen over Abbotsford earlier this year prompting social media posts.

• READ MORE: Strange cloud forms over B.C.’s South Coast

People posted images of the one on Dec. 9 over Chilliwack from as far east as Bridal Falls and as far west as Langley.


@PeeJayAitch
paul.henderson@theprogress.com

Like us on Facebook and follow us on Twitter.

Get local stories you won't find anywhere else right to your inbox.
Sign up here

 

Melissa Violet Anderson posted this image of the “hole punch cloud” that appeared over Chilliwack on Dec. 9, 2019. (Facebook)

Mike George posted this photo on Dec. 9, 2019. (Facebook)

Comments are closed

Just Posted

Peak on the lower Fraser River expected to arrive Monday

Peak predicted for July 6, with flows decreasing from there: River Forecast Centre

Abbotsford Flea Market reopening on Sunday

Market has been closed since March 8 due to the COVID-19 pandemic

UPDATE: Missing Chilliwack 35-year-old woman located

The RCMP were asking for the public’s help to find woman not seen in months

Local property tax late penalties, deadlines different amid pandemic

Province also provides deferrment plan for those who qualify

LETTER: Ticketed and Ticked

Wayne Northey of Agassiz is hopping mad about his parking ticket

Man charged in Rideau Hall crash had rifle, shotguns, high-capacity magazine: RCMP

Hurren is accused of threatening to cause death or bodily harm to the prime minister

B.C. extends income assistance exemption for COVID-19

Provincial program to match Ottawa’s CERB, student pay

Broadway veteran Nick Cordero dies from coronavirus complications

During Cordero’s hospitalization, Kloots sent him daily videos of her and their 1-year-old son, Elvis,

Northern communities welcome tourists as province opens to in-B.C. travellers

Officials have asked British Columbians to be careful as they travel this summer

300 Cache Creek residents on evacuation alert due to flood risk as river rises

Heavy rainfall on Canada Day has river rising steadily, threatening 175 properties

Most Read