What is this water coming from the sky?

I can't walk today because it's raining. Finally. The weatherpersons have been telling us it is going to rain for three days and this morning it is here. Today at school we are supposed to have our reward for the students who have been good all quarter. We are having them play board games, then watching a movie, then we are supposed to walk to Peter Piper Pizza so they can eat and play games. But if it's raining we won't be able to walk. So it should be an interesting day!