The season's first measurable snowfall dropped 1 to 4 inches across the region after taking a southerly track that put us in what one meteorologist called the Alberta Clipper's "sweet spot."

Todd Miner, at Penn State Weather Communications, said these Clipper systems don't pack much moisture. The heaviest amounts - maybe 2 to 5 inches - tend to fall within a narrow corridor 40 to 80 miles wide just north of the track of the central low.

This one, which had initially been expected to track further north, instead swept by us to the south of the Baltimore-Washington area. That put us smack in the sweet spot all day long. The southerly track also kept us in the cold sector of the storm, holding temperatures below freezing all day.

The cold and frozen p[recipitation made driving far from sweet, and more hazardous than many commuters expected. There were hundreds of accidents that snarled traffic during both commutes.

Here are some accumulation reports from the National Weather Service. And here's AccuWeather's snow totals map through the late afternoon.