Without getting into the influence of what we've seen in the media in the last 5 months regarding tsunami's, my initial reaction when I read this was that there was a sense of something overwhelming occurring on a personal level.
It's something akin to how emotions 'wash' over us or we're hit with a 'wave of sadness.'
The fact that you are running and running from this indicates to me an attempt (perhaps) to not let the inevitable get you down or deter you from an ultimate goal.
The wave hasn't hit you in the dream so right now it seems while it may be overwhelming you definitely are ahead of the game (or the wave).
(I pray it wasn't prophetic on a global level)