Questions & Answers about Kad je vjetar jak, oblačim debeli kaput i kapu.
Croatian often leaves out subject pronouns because the verb ending already shows who is doing the action.
Here, oblačim means I put on / I wear, and the ending -m tells you it is first person singular: I.
So Ja oblačim debeli kaput i kapu is possible, but ja is usually omitted unless you want emphasis or contrast.
Both kad and kada mean when.
- kad is shorter and very common in everyday speech
- kada is a little fuller and can sound slightly more formal or careful
So in this sentence, Kad je vjetar jak is perfectly natural and conversational.
Because Kad je vjetar jak is a subordinate clause: When the wind is strong.
In Croatian, when a subordinate clause comes before the main clause, it is normally separated by a comma:
Kad je vjetar jak, oblačim debeli kaput i kapu.
That comma is standard and expected.