As a timelapse photographer, you're many things - Location scout, weather predictor, editor, grader, kit carrier, suspicious looking and a photographer.  What did I miss?  Fortune teller, kind of.  As you shoot more and more, you'll realise that you start to develop somewhat of a sixth sense for future happenings. 

I first noticed this whilst shooting some traffic late at night.  I set up and started shooting but unfortunately for me, I was too close to a bus stop and every couple of minutes on a busy Oxford Street in London, a bus would stop right in front of my shot. 

I'm not just talking traffic here, you'll need to judge your selected spot and predict what the worst outcome may be for your shot.  Have you set up on the beach and the tide is coming in?  Have you set up in a field and you're unaware of the farmer about to release a hundred bulls into it?  Wherever you set up, always bear in mind that you'll potentially be there for a while and your location-specific surroundings can change.