I’ve lived here for decades, so I am very familiar with the weather here—I am of the opinion that it was an unusual volume of rain leading up to the snowfall, rain all night before transitioning to heavy snowfall early AM where I am.
Closing the freeway feels like a good idea, but then you’d have ~130,000 cars/day traveling on surface streets? The Rappahannock doesn’t allow for many crossings other than 95.