Alberta Clippers/Colder Winter

The snow squalls will continue for Thursday but will shift back northward. Thus areas to be affected will be Huron-Perth, Grey-Bruce, Cottage Country, and the Superior East regions.

Squalls will also be on going off Lake Erie and Lake Ontario, but will mainly affect the U.S. through the morning. As the Alberta Clipper approaches the province, the winds will become more southerly. This will push the Lake Ontario Squall north into Prince Edward County as well as into the Belleville to Kingston and Brockville areas. Impacts from this squall could also be felt in parts of the Greater Toronto Area and along the 401 corridor east of the GTA during the late afternoon and evening. Accumulations from this squall from Cobourg along the 401 to Kingston could be near 5-10cm by Thursday evening. The Lake Erie squall will push north into the southern Niagara Region through the mid-afternoon. Snow amounts from this squall are not likely to be very significant but a quick 1-3cm is possible. The evening commute in parts of the GTA could be impacted by this initial snow squall. 

Snow from the clipper itself will push into southwestern Ontario, through the Huron-Perth and Grey-Bruceregions, and into central Ontario during the mid to late afternoon. The clipper snow will push into the GTA, Niagara, and eastern Ontario through the evening hours. The main issue with this system will be the potential for some strong banding associated with it as well as the lake enhancement that will take place. This will lead to highly varying snowfall amounts across the province. Figure 1 below shows one forecast models solution of the general snowfall across the region during the mid-evening. I’ve highlighted where some of the heavier bands look to setup and progress again according to this model. The position and intensity of these bands will not be known for certain until they develop which will cause some variable snowfall amounts.

http://www.theweathernetwork.com/news/articles/alberta-clipper-set-to-impact-ontario-thursday-night/43218/