Canadian Weather Centre - Blog Outreach @ WunderBlog - By Nicholas Tam

Ontario - We're already into 2 weeks of fall, and Northern Ontario is in risk of seeing SNOWFALL later tonight. A low pressure system moving towards Quebec as of September 30 is pulling cold air from the Arctic. This cool air is descending down into Northern Ontario (and into Southern Ontario as well), and much of Ontario can expect a strong northwesterly winds.

This cool air is affecting the daily temperature highs across Ontario in the next 5 days or so. While Windsor is expecting the coolest daily high on this Sunday at only 15 C, towns as north as Timmins are expecting single digits, and at temperature as low as 1 C.

Cooler air, and the "follow-up" precipitation of the low pressure system will both affect Northern Ontario, and this is the perfect combination. Tonight, while temperature in Timmins will drop to as low as -2 C, and the "follow-up precipitation" will fall as snow. We're not expecting a major accumulation, but about 1 - 3 cm across much of Northeastern Ontario, while none to 1 cm in Northwestern Ontario.

This morning, according to RADAR maps, there were freezing rain falling along the northern shores of Lake Superior. Temperature this morning fell close to 0. The temperature (both daily highs and lows) will only continue to fall across Ontario, and will not be expected to rise until at least next Tuesday.

The cold air also affects Southern Ontario. Towns like Stratford can see temperatures around 0 C overnight during this weekend. Around the Golden Horseshoe, however, overnight low temperature will hover around 3 - 5 C for the most parts.

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