Homeland Security Advisory System
Homeland Security Advisory System was designed after 9/11 to provide warnings to the American people about the threat level for a terrorist attack. There are five "threat conditions," and each has a specific color. Your federal government and emergency managers have specific actions they take depending on the threat level. The greater the risk of a terrorist attack, the higher the threat level.
Who decides what the threat level is? The nation's Attorney General and the Secretary for Homeland Security make that decision. The threat level is constantly reviewed and may be changed. So far, since the system was started, there have only been two changes. Last July, officials felt the threat had increased, and they changed the level from yellow to orange. After the July 4th holiday, they lowered the level back to yellow. The threat was elevated again in early February 2003. It was lowered again on February 27, 2003.
are the levels: