At what point can you tell when that magical "snow emergency" level of precipitation has been met? The city of Evanston is considering bringing back a practice of sounding its emergency sirens at the start of a snow emergency, thus alerting its residents that they need to move their car from prohibited streets. In the meantime, and perhaps important to know this weekend, there's a hotline, a website, TV and radio stations that let you know when a snow emergency is in effect. In Chicago, it's a little harder to figure out.

In placing a call to 311 today, I was told that they announce that a snow emergency has been declared on "the TV and the radio," but when I pressed for more information about which stations and who with the City might be telling the tow truck drivers to head out there, I was told to check Weather.com. Once I talked to a supervisor, I was told to check CLTV (channel 10), "any of the radio stations" or the Department of Transportation website (which has nothing about snow, maybe they meant Streets and Sanitation?). My best advice is to probably move your car from a "no parking during a snow emergency" street first, start counting the inches second. But maybe that's their plan all along.