Evacuation orders are delivered in several ways and do vary from community to community. Some counties use mobile alerts such as CIVIC ALERT and RED ALERT to inform citizens of dangers and evacuations. Oregon Department of Forestry instituted a Ready, Set, Go standard for the State of Oregon.
A good rule of thumb is that if you live in the state of Oregon you should always be at "Level 1 - Be Ready" as fire can erupt anywhere at anytime.