NOAA has issued a Winter Weather Advisory for Wyoming that is in effect from 9pm tonight until 9pm tomorrow night.

They’re calling for 5-10″ of snowfall above 8,500′ in the Gros Ventre and Teton mountain ranges and up to 5″ above 7,500′.

A cold wet pacific low pressure trough will bring snowfall to the western and 
northern mountains of wyoming this evening. The heavier snowfall is expected above 
8500 feet where 5 to 10 inches of snow can be expected through 9 pm mdt Tuesday 
evening. Strong gusty west winds are also expected on the passes and higher 
ridges. Snowfall from 8500 to 7500 feet is expected to be from 3 to 5 inches. 
- NOAA Riverton, WY today

The storm that hit Wyoming on Friday/Saturday closed Beartooth Pass between Montana and Wyoming and left snow at both Grand Targhee ski resort, WY and Jackson Hole ski resort, WY.

Winter is coming…

Fall officially begins on Friday.

Winter Weather Advisory for Wyoming:

URGENT - WINTER WEATHER MESSAGE
National Weather Service Riverton WY
212 PM MDT Mon Sep 18 2017

...Wet snow coming to western and northern mountains of
Wyoming above 8500 feet tonight through Tuesday evening...

.A cold wet pacific low pressure trough will bring snowfall
to the western and northern mountains of wyoming this evening.
The heavier snowfall is expected above 8500 feet where 5 to
10 inches of snow can be expected through 9 pm mdt Tuesday
evening. Strong gusty west winds are also expected on the
passes and higher ridges.  Snowfall from 8500 to 7500 feet
is expected to be from 3 to 5 inches.

Teton and Gros Ventre Mountains-
212 PM MDT Mon Sep 18 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 9 PM THIS EVENING TO
9 PM MDT TUESDAY...

The National Weather Service in Riverton has issued a Winter
Weather Advisory for snow, which is in effect from 9 PM this
evening to 9 PM MDT Tuesday.

* TIMING...Snow will develop across the Teton and Gros Ventre
  mountains becoming widespread around 9 pm mdt. Periods of wet
  snow will bring accumulations of 5 to 10 inches above 8500 feet
  with snow accumulations of 3 to 5 inches from 8500 to 7500 feet.
  Snowfall will taper off by 9 pm mdt Tuesday evening. Strong
  gusty west winds are also expected on the passes and higher
  ridges.

* MAIN IMPACT...Snow and wind may make travel difficult above 8500
  feet.

* OTHER IMPACTS...Campers and hunters should be prepared for cold
  snowy and windy conditions.