Snow
The route has several spots that are covered with ice. The paths in Central Park are covered in hard packed snow. I partially deflated my tires to get more contact and that seems to help -- there were only a couple of spots where I slipped a bit and they were slopes with corners that were ice and snow covered. But on pavement it's like riding on marshmallows.
It's supposed to snow tonight. I hope it doesn't start before I leave for home. And I hope it doesn't make the roads any worse. I do not want to take the train tomorrow.