Why was this NASA spy plane over B.C.?

A high-altitude NASA spy plane was just tracked flying over British Columbia's wildfires. Why? It was on a mission to study "fire clouds," self-perpetuating thunderstorms generated by the blazes themselves that can trigger fire tornadoes and lightning. CBC Meteorologist Johanna Wagstaffe breaks down the science behind these pyrocumulonimbus storms and why climate change is making them more frequent.