The Swiss ski resort blaze quickly developed into a ‘flashover,’ authorities say. Here’s what that means

By Billy Stockwell, CNN (CNN) — Swiss authorities have said that a deadly fire at a ski resort bar in Crans-Montana, Switzerland, rapidly developed into a “flashover” – a dangerous phenomenon in which everything in a room ignites almost simultaneously. The blaze quickly grew into a “flashover fire” after likely being caused by sparklers in