This happenned on Tuesday. No chance of ice. There had been a spectacular thunderstorm the night before (which was wonderful fun to ride home in, the streets were like rivers ), but the road had dried by morning. I also went back to see if there might have been any residual sand...street cleaning was done in the spring, but there's always the odd patch that gets missed.

But no, just a random slideout, something I have literally never done before. And I ride in winter, albeit carefully. The only thing I can think of is that I hadn't filled my tires in a while, and they were indeed much lower pressure than I like to keep them, so maybe it had something to do with too much flex in the tire as I cornered.

Whatever, just a weird event. Happily, I was actually wearing my rain coat, which also gets brought out for cool mornings. Like you, I landed on my elbow and the coat was undamaged. My elbow really only scraped the very top layer of skin, so it's mostly healed already.