Snow!
Made it in to work without any trouble - but then, I live just off-site from the Lab, and I have four wheel drive. The roads in Warrenville are plowed, but ugly - there is that half-inch of leftover snow the plows miss, which is glazed over and wind-polished to a mirror sheen. The wind is starting to pick up, and what has been plowed is starting to drift over. Unless you absolutely have to go out today, don't even try it.