A storm like that is an 'anomaly' for this area. [=a storm like that does not usually happen in this area]
The doctor detected an 'anomaly' [='irregularity'] in my heartbeat.
(..) Can you imagine, what we'll find? Alien deathspots, Calvenom killing us. Deadly space worm, viruses and bacteria. Incomprehensible cosmic anomalies that could light us out in an instant. It's gonna be so much fun. By the way, where're we going? I thought we were gonna get drink. (..)2016 Star Trek Beyond