National Weather Service Riverton WY 222 PM MDT Wed Sep 20 2017 ...A New Storm System Will Take Aim On Western Wyoming Tonight Into At Least Friday... .The large, cold, and wet pacific Pacific storm will move quickly into much of Western Wyoming this evening and continue to affect western and northwestern Wyoming through Friday. Isolated snow showers this afternoon will increase to to numerous across the western and northwestern mountains this evening. Heavier snowfall is across the Teton, Gros Ventre, and Wind River Mountains above 8500 feet where from 8 to 20 inches of snow can be expected through noon Friday. Salt River and Wyoming Ranges- 222 PM MDT Wed Sep 20 2017 ...WINTER WEATHER ADVISORY NOW IN EFFECT FROM 9 PM THIS EVENING TO NOON MDT FRIDAY... * TIMING...A few isolated snow showers this afternoon will give way to moderate to occasionally heavy snow tonight over the Salt and Wyoming Mountains...continuing through Friday morning. Total snowfall will range from 4 to 12 inches above 8500 feet with snow accumulations of 2 to 4 inches from 7500 to 8500 feet. * SNOWFALL...4 to 12 inches above 8500 feet with 2 to 4 inches down to 7500 feet. * MAIN IMPACT...Heavy snow will make travel difficult at times. * OTHER IMPACTS...Campers and hunters should be prepared for cold snowy and windy conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... A winter weather advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered and slick roads with limited visibilities. Slow down, and allow extra time to reach your destination. Check the latest road conditions at wyoroad.info or by dialing 5 1 1.