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.
(..) Next thing you know, we have S.H.I.E.L.D. crawling all over "Area -ing" the place. Jane. We had a stable gravitation anomaly. We had unimpeded access. Our only competition was ten years old! Jane! You were gone for five hours. (..)2013 Thor: The Dark World