Coldest air of the winter
The mild air will last into Sunday when another clipper with a strong arctic cold front will cross the region. Look for a few showers changing to flurries Sunday with increasing winds plummeting temperatures, much the same as Thursday. Early highs will be around plus 1C but drop rapidly to overnight lows of -20C by Monday morning in Montreal. The mercury will struggle all next week to make it to -15C with overnight lows of -25C as the coldest air mass of this winter comes into southern Quebec and Ontario. No moderation in temperatures is likely before Friday. At this time no major storms are expected next week, just clear skies and cold.
|While Alberta Clippers are fairly weak, they can still ice up roads as they did in southern Saskatchewan on Wednesday leading to multiple accidents on the Trans-Canada. (CTV News Sask)|
An Alberta Clipper is the name given to weak low pressure areas that start in Alberta and move rapidly across the Great Lakes and down the St. Lawrence Valley. While they are weak, they can give a few centimetres of snow and usually allow for rapid, wild temperatures swings. They can also turn on the Lake Effect snow machine as cold northwest winds sweep in behind them and across the Great Lakes.