This is the part of the government incident alert that went out today:

Weather conditions today create the possibility of extreme fire growth. A large smoke and ash column may form in the northwest area of the fire. Large smoke columns have the potential to create thunderstorms which may lead to lightning and strong winds. With the current unstable atmosphere the column may raise high enough to form an ice cap. Eventually the weight of the ice will cause the column to collapse. When the column collapses strong downdraft winds push the fire in multiple directions placing firefighters at risk.

Spot fires ahead of the main fire may be caused from embers in the smoke column and from the downdraft winds.