Yesterday's New York Times has a map of relative risks for more than 300 cities that you can access here.
The only quibble I would have is the low risk they assign to Boulder, Colorado. There is a high potential risk of flash flooding there -- it just hasn't occurred recently. I would put them in the overall "medium" rather than "low" category.
Finally, they don't take into account ice storms and sudden blizzards. As the people of Kentucky can tell you, it is possible to be without electricity for more than three weeks (!) after a major ice storm (this occurred in late-January and February, 2009).
Otherwise, the map seems reasonable.