The cities of Cambridge, Kitchener and Waterloo have all declared snow events which will begin at 11:59 p.m. on Sunday evening.
Once the snow event comes into effect, cars parked on city streets risk being tagged or towed at the owner’s expense.
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The bans are in effect for 24 hours or until the cities put an end to them.
Overnight parking exemptions are not permitted.
Environment Canada issued a weather statement on Sunday which called for the region to see as much as 15 to 25 cm of snow through the evening.
Cities declare a snow event in order to help crews clear the roads as quickly as possible.