DENVER - Cities like Denver and Lakewood tested their tornado sirens on Wednesday, marking an unofficial start to the severe weather season.
The sirens went off simultaneously around 11 a.m.
9News would like to offer up the following web pages if you are interested in signing up for your county's automated emergency notification system.
Colorado Office of Emergency Management county-level emergency management websites: http://on9news.tv/10Womue.
Clear Creek County
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