In addition to the authority already granted the city manager or the manager’s designee under section 5.040 of this code to temporarily close any street to vehicular or pedestrian traffic, the city manager or the manager’s designee shall have the authority under this provision to temporarily close any street to vehicular or pedestrian traffic when in his or her opinion it is necessary to do so because of a snow emergency. However, such closure shall not be subject to the notice requirements and appeal requirements set forth in sections 5.040 and 5.045 of this code. Nevertheless, the city manager shall cause to be placed and maintained during such temporary closures “no parking”, “no walking”, “street closed”, or other appropriate directional signs.