Whenever the Mayor shall determine, on the basis of the falling snow, sleet, or freezing rain, or on the basis of an official forecast by the United States Weather Bureau, of snow, sleet, or freezing rain, that eminent weather conditions will make it necessary that parking on snow emergency routes, as designated by §
72.025, be prohibited or restricted from snow plowing and other purposes, the Mayor may place into effect a parking prohibition on all snow emergency routes by declaring that emergency conditions exist. In the declaration of emergency conditions, the Mayor shall state the time that the emergency shall become effective. From the time so designated, all parking of vehicles on snow emergency routes, shall be, and the same hereby is, prohibited. While the prohibition is in effect, no person shall park, or allow to remain parked, any vehicle on any portion of a snow emergency route. Once the emergency is in effect, the parking prohibition imposed by this section shall remain in effect until terminated by declaration of the Mayor. However, nothing in this section shall be construed to permit parking at any time or place where it is forbidden by any other provision of law.