In an effort to keep up with new technology and improve warnings to residents, the city of Denver began a much-needed upgrade of its outdoor warning sirens yesterday. The system will feature improved reliability and the ability to target warnings.  Read about Denver’s new system on Examiner.com. 

What about Thornton?  The city that was the site of the most destructive tornado ever in the Denver metro area doesn’t have sirens.  The city did however implement an email warning system this past spring – click here to read more.