A report is hereby given to the results of an originally seemingly inconspicuous burn in a simple simulated urban street arrangement which is inductive to probable gross vortex formation. These results reveal in vivid details a series of most unusual and exciting events of gross vortex development and their related fire-brand spotting activities. These findings point to a promise of an understanding of, among other things, some of the strangest fire behaviors observed in large urban fires.

[This publication is referenced in the "Synthesis of knowledge of extreme fire behavior: volume I for fire managers" (Werth et al 2011).]