Significance of Tornadoes in a Dream?

I think you are looking back at changes in your life that you were somewhat apprehensive about, but as it played out you are remembering it wasn't as bad as you thought it was going to be. The 4 different situations could be your life situation at the time of the abrupt changes which you were concerned about. It may be a subconcious reminder to you that you have braved the storm of change and it could be happening again but don't worry you will be fine.