Cecil writes: I heard on the radio this morning (2/20) that Albemarle County and Charlottesville City schools (among others) are closed today. I don’t have a problem with that; I don’t even have a child in the school system. But I am curious – -it seems to me that the streets are pretty much clear, at least in the city. Why do they remain closed? Does anyone have any experience with these kinds of school-closing decisions, someone who could shed light on what factors go into consideration? This layperson wonders.