It doesn't have to be snowing for a storm like this to shut down a city. All over this region, schools and businesses and government offices are closing early, so the roads will be clear when the snow starts falling in about 3 hours. There is no doubt about what's coming, no false alarm from the weatherman; it's best for folks to be off the roads and safely inside their homes, so the snow removal crews can do their jobs.
It's the threat - not the storm. The storm hasn't started.