Declaration of emergency.

Whenever the sheriff or designated city official determines that there has been an act of violence or a flagrant and substantial defiance of, or resistance to, a lawful exercise of public authority and that, on account thereof, there is reason to believe that there exists a clear and present danger of a riot or other general public disorder, widespread disobedience of the law, and substantial injury to persons or to property, all of which constitute an imminent threat to public peace or order and to the general welfare of the jurisdiction affected or a part or parts thereof, he or she may declare that a state of emergency exists within that jurisdiction or any part or parts thereof.