Looking for the title of a film in the 80s where a couple of teens survive a cosmic event which turns everybody into red dust, except people who were totally enclosed. Any ideas?

Night of the Comet (1984) - Plot Summary (http://amazon.imdb.com/title/tt0087799/plotsummary)

Wow that was fast - and been bugging me for several years now - Superb thanks :)

Glad to be of service. The bad part is when you remember just enough to irritate but not enough to research.