Significant snowfall beginning tonight.What:Snowfall amounts of 15 to 25 cm.Reduced visibility at times in heavy snow and local blowing snow.When:Beginning tonight and lasting into Thursday evening. Snow tapering off Thursday night.Additional information:A developing low pressure system will bring significant snowfall to much of southern Ontario. A sharp temperature drop leading to cold wind chills by Thursday morning, during ongoing snowfall, will add to the adverse weather conditions.###There may be a significant impact on rush hour traffic.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 #QCStorm.For more information about the alerting program, please visit: https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/colour-coded-alerts.