Nuclear Snow?

You've probably heard of lake-effect snow and ocean-effect snow, but now you should add "nuclear snow" to the list of strange winter weather phenomena. As the Midwest and East shivers under a bitterly cold air mass, waste heat given off from the Beaver Valley Nuclear Power Plant near Shippingport, Pa., generated a narrow band of snow. Up to an inch of snow fell as a result of the steam billowing from the stacks.
The steam from these power plants added heat and moisture to an extremely cold and dry atmosphere, causing the moisture to condense and form clouds and snow flurries. It's not uncommon for steam from power plant cooling towers to help form clouds in downwind areas, but it is rare for them to produce precipitation like this, and even rarer still to see it so clearly via Doppler radar imagery.

http://www.climatecentral.org/news/nuclear-snow-power-plant-produces-snow-in-penn-15501