Well, what do you get when you combine some lingering moisture, and extremely cold temperatures aloft? Unfortunately it's not a joke, but it does give us an answer to the light snow from today. The clouds didn't clear like the models had anticipated, and with the strong northwesterly winds aloft, the combination of cold air and moisture was enough to squeeze out some fine light snow flakes.

Look at the picture above. This is a depiction of relative humidity around 1,500 feet aloft. The moisture was just deep enough to produce the light snow. Moisture around 5,000 feet really wasn't present, so you had a very shallow area of low clouds, but that proved to be enough today.

By the way, the best snow making typically occurs around 10,000 feet above our heads; maybe Friday will lead to better snowfall.