Wunderground.com - 3/5/13, Dr. Jeff Masters
The snow has begun in Chicago, as what promises to be their biggest snowstorm of the season moves through. The fast-moving "Alberta Clipper" has already brought up to 10" of snow to Minnesota and North Dakota. These type of storms, so-named because they originate in Alberta and clip along at a fast forward speed, typically bring the Midwest moderate amounts of fluffy snow that is relatively easy to shovel. However, this Clipper is traversing through an atmosphere that is warmer than usual for these types of storms--close to the freezing point near the surface.
Since warm air can hold more moisture, this Clipper is bringing heavier snowfall amounts than is usual for a Clipper, with 4 - 8" of snow expected inChicago. The storm, dubbed Winter Storm Saturn by The Weather Channel and "Snowquester" by The Washington Post's Capital Weather Gang, is expected to bring a swath of 4 - 8" of snow into the Mid-Atlantic through Wednesday, with the heaviest snows in excess of a foot falling in Western Virginia and eastern West Virginia.
For more weather details click: Chicago Snow Storm