One of the questions investigators face is what role pyrocumulonimbus clouds, or pyroCbs, played in accelerating the worst fire in the park’s 117-year history
that destroyed one-third of the town of Jasper, Alta., two weeks ago, Parks Canada says it has been working with
The air rising at the centre of the formation can send smoke and burning embers upward and outward for many kilometres. The cause of the Jasper wildfires still remains under investigation. Eyewitness accounts and other observations suggest it was started on July 22 by multiple lightning strikes to the north and south of the town, which sits at an intersection point of mountain valleys running through Jasper National Park.In the south, three fires merged and rapidly advanced toward the town, aided by strong winds moving in the same direction.
All of this is of concern to analysts who use computer models to forecast fire behaviour. Once a pyroCb is in the mix, a fire can become less predictable, and its rate of spread is less likely to be reflected in models designed to show how fire moves across a particular landscape driven by external winds and fuel availability.study published last year
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