One of the best things someone who has experience a tsunami can do s to try to understand and think about the situation that has happpened, how he or she has reacted to it and how he or she could have reacted to the situation. This advice of course talks more about the mental aspect rather than the actual physical one.
The ultimate source of energy that lifts and transports the atmospheric water (vapor and cloud) to its highest elevations is solar energy. It is the sun that gives enough energy to water for its evaporation.
