If this was January, temperatures below -20°C would be barrelling towards Ontario and Quebec.
Instead, it’s early October, but it’ll still create a surprisingly strong temperature plunge this long weekend.
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It’s worth considering if the polar vortex is the reason behind this shift in weather patterns. Over the last week, there have been indications that the polar vortex is expanding over the North Pole. This expansion, combined with an amplified weather pattern, will guide a sliver of the polar vortex south.
The residual warmth of the summer season is baked into the ground. The warm waters of the Great Lakes will also fight to moderate the air. A lack of snow cover works to warm the air as it travels great distances over Canada.
The Prairies get a taste of some seasonably cool temperatures, with highs stubbornly hanging in the single digits for Saskatchewan and Manitoba by Friday.