On application of the chief executive officer or governing body of a county or municipality during an emergency, the governor may proclaim a state of emergency and designate the area involved. For the purposes of this section an emergency exists in the following situations:
(1) a riot or unlawful assembly by three or more persons acting together by use of force or violence;
(2) if a clear and present danger of the use of violence exists; or
(3) a natural or man-made disaster.