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Weather expert says cooler temperatures help create vapour trail phenomenon in NSW, as air travel booms

Weather expert says cooler temperatures help create vapour trail phenomenon in NSW, as air travel booms

Posted on April 28, 2022 By Sharika Soukup

Table of Contents

  • Key points:
  • Trails line up weather forecast
  • Find more local news

The boom in air travel over the Easter holiday week has had a unique consequence for regional NSW, with residents in the state’s north west reporting a dramatic increase in vapour trails filling horizons.

Key points:

  • Hundreds of vapour trails have been spotted over north-west NSW
  • Cooler weather, increased moisture, and a boom in air travel created the spectacle
  • Weatherwatch’s Don White says flights at high altitudes between major cities are the main cause

Also known as ‘contrails’, some people have photographed up to 10 at a time over Armidale, Tamworth, and the Liverpool Plains. 

Weatherwatch director Don White said the phenomenon was caused by planes flying at high altitudes during cooler weather.

He said, above 8,000 metres, temperatures over the region dropped to below minus 30 degrees Celsius.

“[Vapour trails] are formed in the upper atmosphere, caused by the hot air from the plane creating ice crystals and water droplets creating a visible trail,” he said.

pink vapour trails over a house
Kel Risk spotted a pink-striped sky over Uralla.(Supplied: Kel Risk)

There has been a boom in air travel due to Easter and COVID restrictions easing, and Mr White said aircraft travelling between major cities was the main cause of vapour trails because they had the highest flight paths over regional NSW.

“You don’t get them near the airport,” he said.

“Melbourne to Gold Coast, Sunshine Coast, or even Sydney to Sunshine Coast follow a circle over the Northern Tablelands and Tamworth region at maximum height.

“What’s also made a difference in the past week is the rain in eastern Australia. The upper atmosphere is quite moist at the moment.”

vapour trails over house
Chris Hardy says he watched the trails as the sun set over north Tamworth.(Supplied: Chris Hardy)

Trails line up weather forecast

Although this week proved to have the perfect conditions for maximum vapour trails, Mr White said the sight would be short-lived.

“There will be fewer of them around after this week, as the upper atmosphere becomes more stable. But there’ll be periods over winter where it will have more moisture,” he said.

“It will now fluctuate. There have been some weeks where there are virtually none around, and some weeks where there are quite a few.”

vapour trails shining pink over a tree
A Facebook post on a community weather page attracted more than 100 comments, sharing photos of the skies.(Supplied: Cheryl Hardwick)

The spectacle had locals in the region sharing their vapour trail snaps on social media. 

One Tamworth community weather Facebook page attracted more than 120 comments with locals sharing their experiences.

But on top of the photographic opportunity, Mr White said vapour trails could also help predict the weather. 

vapour trail white lines in a sunset sky
More than 10 vapour trails at a time were spotted in Loomberah, south of Tamworth, on Tuesday night.(Supplied: Jodi Keating)

“If they break up fairly quickly and disappear, the upper atmosphere is quite stable,” he said.

“If they persist for longer, you can check the direction of movement.

“If they expand a little bit, there’s a little bit of instability in the atmosphere and that usually indicates there’s the potential for rain around.”

Find more local news

https://www.abc.net.au/news/2022-04-20/weather-vapour-trails-across-regional-nsw-as-air-travel-booms/100999518

Tags:Air, booms, cooler, create, expert, NSW, phenomenon, Temperatures, trail, travel, Vapour, Weather

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