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.
(..) Romulans? Cadet Kirk, I think you've had enough attention for one day... McCoy, take him back to medical. We'll have words later. - Aye captain. - Sir, that same anomaly... Mr. Kirk is not cleared to be aboard this vessel, captain... Look, I get it, you're a great... I'd love to do it again (..)2009 Star Trek
(..) Authorization not recognized. Ensign authorization code Victor Victor . Access granted. May I have your attention please. At , telemetry detected an anomaly in the neutral zone. What appeared to be a lightning storm in space. Soon after, Starfleet received a distress (..)2009 Star Trek
(..) Nobody stumbles in here, nobody stumbles out. Cooper, please, cooperate with these people. Well, it's kinda hard to explain. We, we learnt these coordinates... ...from an anomaly. -What sort of anomaly? I hesitate to term it supernatural but it wasn't scientific... You're gonna have to be specific (..)2014 Interstellar