This one is very unusual because we are getting a LOT of accumulation with temperature below -10, in late November.
A strong, prominent, and slow-moving trough will create very long-lasting snowfall, likely accumulating about 15 cm. Snow is expected to begin to fall this evening, and last until tomorrow night. It will be the heaviest during the day on Saturday.
Most forecasts have the accumulation amount near 15 cm. It does seem though that it could end up as low as 10. However, the upper end is massively farther with the highest estimating 25 to 30 cm. If we get that much, this would probably be one of the biggest snowfall events of the 2020s!
Watch out for very snowy conditions for the next while, especially Sunday. The main thing about this is, the snow will probably not even begin the melt until December, because this cold wave is looking like it will keep temperature below 0 for the rest of the month. This means, whatever we get now will probably stay for at least a month.