The image below from the Australian Bureau of Meteorology shows several thunderstorms in southeast Queensland today and the directions they are expected to move.
I'm surprised how different these directions are. I had imagined that
- the main influence on a storm's trajectory would be high level winds, and
- the high level winds would be relatively uniform in such an area, being unaffected by geographical features (hills, rivers).
But that doesn't seem to fit with this evidence.
What factors influence the direction of a storm's movement?