Winter storm warning, as in WINTER storm warning. Forecasting 10 to 20 inches above 8500 feet.
National Weather Service Riverton WY
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 continue to affect western and northwestern Wyoming through Friday. Isolated snow showers today 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.
Wind River Mountains West-Wind River Mountains East-
The National Weather Service in Riverton has issued a Winter Storm Warning for heavy snow, which is in effect from 9 PM this evening to noon MDT Friday.
* TIMING…A few isolated snow showers today will give way to moderate to heavy snow tonight over the Wind River Mountains…continuing through Friday morning. Total snowfall will range from 10 to 20 inches above 8500 feet with snow accumulations of 4 to 10 inches from 7500 to 8500 feet.
* SNOWFALL…10 to 20 inches above 8500 feet with 4 to 10 inches down to 7500 feet.
* MAIN IMPACT…Heavy snow will make travel difficult at times…mainly over Togwotee Pass.
* OTHER IMPACTS…Campers and hunters should be prepared for cold snowy and windy conditions.
Thanks to Kenneth Lund for this link