Snow for the mountains this afternoon and tonight... This is a special weather statement from the National Weather Service Office in Riverton. * WHAT...Snow. Snowfall of 3 to 6 inches below 8500 feet. Snowfall of 6 to 12 inches above 8500 feet. * WHERE...Northwest Wyoming Mountains and Yellowstone National Park. * WHEN...This afternoon into tonight. * ADDITIONAL DETAILS...Teton Pass and Togwotee Pass will see winter driving conditions this morning with snow on the roadway. Roads will be mostly wet this afternoon. Those planning outdoor activities in the high country should be prepared for cold and snow today.