Let's start with total precipitation (rain + snow/ice melted) for the next five days:
|click to enlarge|
A blizzard is likely over the northern Plains and southwest Canadian Prairies beginning later today. This first map is the probability of two inches or more accumulation.
The second map (below) is the probability of eight inches or more of accumulation:
And, as if all of this wasn't enough, the map below indicates where severe thunderstorms and tornadoes are possible Saturday.