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.