Blogs

http://www.accuweather.com/blogs/weathermatrix/story/50072/historic-severe-outbreak-to-affect-80-million-in-metros.asp

As you can see from the map above, which shows cities in black, nearly every major metropolitan area in the heart (and east coast) of the country is under a severe thunderstorm threat today. I tabulated the major metropolitan centers only, and came up with a number of 70 million city folks who are in the Slight Risk area, with 11.5 million in the Moderate or High Risk areas (where tornadoes are most likely to occur).