Medium Season 7 Episode 6 (Medium s07e06) with title “Where Were You When…?” aired on Friday, October 29th 2010 at 08:00 pm via CBS Network.
Here is summary for Medium Season 7 Episode 6 :

When Allison begins having flashes to a specific time in the future, her sense of dread grows as she feels more and more powerless to stop a catastrophic event from occurring.