Homeland Security Alert Codes
GREEN: Low risk of terrorist attacks.
Refine and exercise planned protective measures.
Ensure emergency personnel receive training.
Assess facilities for vulnerabilities and take measures to reduce them.

BLUE: Guarded condition. General risk of terrorist attack.
Check communications with designated emergency response or command locations.
Review and update emergency response procedures.
Provide the public with necessary information.

YELLOW: Elevated condition. Significant risk of terrorist attacks.
Increase surveillance of critical locations.
Coordinate emergency plans with nearby jurisdictions.
Assess further refinement of protective measures within the context of the current threat information.
Implement, as appropriate, contingency and emergency response plans.
ORANGE: High risk of terrorist attacks.
Coordinate necessary security efforts with armed forces or law enforcement agencies.
Take additional precaution at public events.
Prepare to work at an alternate site or with a dispersed work force.
Restrict access to essential personnel only.
RED: Severe risk of terrorist attacks.
Assign emergency response personnel and preposition specially trained teams.
Monitor, redirect or constrain transportation systems.
Close public and government facilities.
Increase or redirect personnel to address critical emergency needs.

Federal Homeland Security Web Page
Texas Homeland Security Web Page