ORIGINAL CAPTION: Mud flows between houses and into the street in an evacuated neighborhood during the fourth storm of the week on January 21, 2010 in La Canada Flintridge, California. Hundreds of homes have been evacuated because of the threat of major mud slides and debris flows below foothills and mountains that burned last year. Despite warnings by firefighters that they will not be able to get through debris flows to rescue stay-behind residents if a major event occurs, many refuse to leave. The threat is particularly high near the San Gabriel Mountains which were denuded of natural flood-controlling vegetation by the 250-plus square mile Station Fire. (David Mcnew / Getty)