establish criteria for the issuance and revocation of such advisories or warnings;

develop a methodology, relying on the criteria established under paragraph (1), for the issuance and revocation of such advisories or warnings;

provide, in each such advisory or warning, specific information and advice regarding appropriate protective measures and countermeasures that may be taken in response to the threat or risk, at the maximum level of detail practicable to enable individuals, government entities, emergency response providers, and the private sector to act appropriately;

whenever possible, limit the scope of each such advisory or warning to a specific region, locality, or economic sector believed to be under threat or at risk; and

not, in issuing any advisory or warning, use color designations as the exclusive means of specifying homeland security threat conditions that are the subject of the advisory or warning.