What do Code Yellow, Code Orange and Code Red alerts mean?
Virginia has adopted the U.S. Department of Homeland Security’s color-coded Homeland Security Advisory System, which categorizes credible threats at five levels ranging from green (low) to red (high). The higher the threat condition, the greater the risk of a terrorist attack. Risk includes both the probability of an attack occurring and its potential gravity. Citizens often want to know what they should do at each threat level.
