There are two factors at play here, and again, I'm speaking from having been a TV news manager for 20-plus years (show producer, then executive producer, then assistant news director).
#1 - We really do have the worst conditions in town. So there's really not any place else to be in Seattle. As I wrote on the HP, I was downtown tonight and was shocked at how there's really no ice, no snow down there ... this is a lot like the early 2007 icefest, we got whacked worst. If Queen Anne had gotten much ice, they'd all be over there - much more convenient to where the stations are (Seattle Center x 2, and the other two a tiny bit further north).
#2 - The fact that we together (you guys and us) are providing minute-to-minute, detailed coverage here means they don't even have to try hard to figure out where to go. In the pre-neighborhood-news-site days, you would just send a crew out and tell them to FIND an icy street. With a site like ours, piece of cake, all they have to do is read the post/comment thread (and our logs show, they all do, even when there isn't a big story like this - it's nothing personal, before the digital days, we all sat around in TV newsrooms and read the paper, TV news departments don't staff enough people to do lots of original news gathering).
Bonus factor - since WS is a large part of the city and convenient to downtown, there of course are TV people who live over here, and so they also have firsthand knowledge of the troublespots (photographers and producers as well as reporters and anchors). I am always continually surprised as I continue to make more contacts on behalf of WSB, at how many government-agency PR people and actual government officials live over here, beyond the obvious ones you've already heard of, like the mayor.