Notes
Temperature was 39 when I left, 45 when I came back. Very annoying run due to completely invisible but still extremely slippery black ice. Also encountered barely visible sheet ice in the park which I initially mistook for water and thus slid around on. Spent the entire run going flat-footed to maximize traction. Then, driving to work, I slid all over the road. How it can be so icy at 45 degrees is a mystery to me.