The system will usher in some warmer air, but it will only warm to near normal in the high minus teens. This can be partly blamed on the southerly component of the wind funnelling up the valley, not very conducive to drastic warmups, especially this time of year.
Colder air will be ushered in behind the system for Christmas Wednesday with temperatures hovering near or just above -20°C. Some flurries will be possible, especially in the morning.
Seasonably chilly conditions will be the story late week, before our next chance for snow late Friday into Saturday associated with a stronger clipper system. It is too early to call for specific amounts, but 5-10 cm in some areas is possible. It is too early to say if Winnipeg will get into these amounts. Keep in touch with Rob's Blog and A Weather Moment for updates on the system as I will taking a break this week.
At this point, a strong push of very cold air is expected behind that system with a return to very frigid conditions next week.
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Merry Christmas, Happy Holidays and all the best in 2014!