Whenever, due to an emergency resulting from the effects of an enemy attack, or the anticipated effects of a threatened enemy attack it becomes imprudent, inexpedient or impossible to conduct the affairs of the city at the usual place or places thereof, the governing body of the city may meet at any place within or without the territorial limits of the city on call of the presiding officer or any two members of the governing body, and shall proceed to establish by ordinance, resolution or other manner, alternate or substitute sites or places as the emergency temporary location or locations of government where all or any part of the public business may be transacted and conducted during the emergency situation. Such sites or places may be within or without the territorial limits of the city and within this state. (Prior code § 1-803)