Heist Society is very cinematic in its use of weather effects. When Kat gets up the nerve to get into Taccone's fortress—through the front door, rather than via some elaborate heist trick—the author uses weather for great dramatic effect:
"My name is Katarina Bishop." Lightning struck behind her. "I'm here to see Arturo Taccone." (8.79)
And with that blast of electricity, the plot is pretty much set in motion. So, as in many movies since the beginning of time, bad weather symbolizes drama and foreboding in this novel.