Whenever snow has fallen and the accumulation
is such that it covers the street, no person shall park any vehicle
on any of the streets or portions thereof listed in Schedule XIX attached
to and made a part of this chapter. The above parking prohibition
shall take effect immediately after the snow has covered the street
and shall remain in effect after the snow has ceased until the street
has been plowed sufficiently and to such an extent that parking will
not interfere with the normal flow of traffic.