The new Weather Watcher sign atop the WCCO building has been alerting TV viewers and passersby to changes in the air since the day after Thanksgiving. That has prompted several Good Questions from WCCO viewers, including one from 10-year-old Alex of Glenwood City, Wis. He wanted to know: How do we decide when to change the color? For example, flurries were in the forecast for Monday night, but warmer weather is on the way. The Weather Watcher was shining red. “I was watching the news and it was showing red on the thing, and I looked at it and said snow is coming, too,” Alex said.