You don't want to mess with lightning. We don't have to deal with that too much here. I have left my bike at work on a few wintry afternoons when the snow or ice came and my bike was shod with the wrong tires. I don't want to have to ride for an hour in dicey road conditions, so I've run the 12-mile commute a few times. I'd take another bike to work the next day, and wait for an opportunity to run to work at some point in the near future and ride the bike back home.