It's that time again... when the weather forecast starts to include tornado watches and warnings. Colorado's a busy state for twisters... and, in general, it can be a tough place to forecast the weather. Ask Mike Nelson, chief meteorologist at Channel 7 in Denver. He's author of the book "Colorado Weather Almanac." Ryan Warner spoke with him early last year... just after the book hit shelves.

First aired January 11, 2009

Photo: Michael Rieger/FEMA