Factual error: It's stated after the Yellowstone Caldera explodes that the Ash Cloud would hit Las Vegas first, then St. Louis, Chicago and so on. We see Jackson and his family land in Vegas, then the action moves to D.C., where we learn the V.P.'s chopper goes down in the ash cloud in Pittsburgh. A pyroclastic cloud that we see moves at 450mph. It would reach Vegas long before it reaches Pittsburgh. Vegas would have been long gone before Jackson and family could reach it.
dablues7
9th Mar 2010