場合(ばあい)はIn the event of, In the case of

場合(ばあい)は is a phrase in Japanese that is often translated to 'in the event of (A)', or 'in the case of (A)'. It can be used with almost any type of word, but will require な when following a な-Adjective, or の when following a noun.

場合(ばあい) by itself is usually translated as 'case', or 'situation'. It is frequently used to highlight a hypothetical situation, or a viewpoint/characteristic of another person.

When 場合(ばあい)は is highlighting a viewpoint/characteristic of another person, this is almost always in contrast/comparison to something that is already being discussed. This is an example of the contrastive nuance of the は particle.

Caution

In relation to a situation, because 場合(ばあい) means 'to encounter (A)', it has a nuance of randomness. Due to this, 場合(ばあい)は will not be used to describe events that regularly occur, or events that can be planned/controlled.