Before I get to the snowfall I'd like to mention about temperatures tonight. It is likely that we'll dip below -30°C tonight, and it is possible that we may get as low as the mid -30's if conditions set up good enough. The best chance for lows in the mid to low -30's will be in the Interlake and southwestern Manitoba. The coldest spots could see lows dip as low as -35 to -38°C. Will be interesting to see how cold we get.
Temperatures will rise ahead of a system tomorrow night as winds veer to become southerly.
There's bad news for travellers however for Christmas Eve Tuesday. A system to our north will provide the opportunity for snow and blowing snow. The snow may be heavy at times, especially under any local heavier bands that develop. A general 3-7 cm is expected south of the lakes, with locally higher totals of 10 cm not out of the question under any heavier bands that form. In the Winnipeg area, the snow is expected to begin in the early morning and end in the afternoon.
However, the big story on the highways will be wind. Strong southerly winds will create dangerous highway conditions due to blowing snow. If possible, consider travelling on Monday instead of Tuesday. Will provide another update tomorrow in case things change a bit.
Another push of frigid air moves in behind the system for Christmas day, however it is not expected to last very long with some milder air expected late week.