Snow heralding a sudden return to winter.What:5 to 15 cm of accumulating snow, with the lowest amounts expected towards extreme eastern Ontario.When:Tonight into Tuesday morning. Additional information:Rain over eastern Ontario will turn to snow tonight as temperatures drop. A general snowfall of 5 to 15 cm is expected by Tuesday morning. Travel will likely be challenging.Prepare for quickly changing and deteriorating travel conditions.###Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm.