Raining in the afternoon

It was raining quite heavy just now.
No one in the house today.
I called my mum to see whether I need to fetch my little sister from school or not.
I cannot drive to school as there will be a lot of cars around there waiting for children back home.
I was thinking to walk to school with umbrella. Once I stepped out from house, I saw my little sister came back with umbrella that borrowed from friend.