A cold and snowy start to the winter is expected, but it could turn milder and wetter come January in Southern Ontario, according to CityNews’ winter weather forecast.

Meteorologist Natasha Ramsahai says the first half of the winter is going to look very different than the second half of the winter, mostly due to La Nina, the cooling of Pacific Ocean’s surface temperatures, which is one of the biggest drivers of North American winter.

“The La Nina advisory that’s in place now is going to impact the jet stream and our winter, but things are likely going to change,” said Ramsahai.

The amount of snow in Siberia also plays a role in determining how the winter pans out, including impacting the polar vortex.

“The polar vortex is this large area of cold air aloft that sits at the poles. A str

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