Forecast Snowfall through Monday Afternoon

National Weather Service Riverton WY
101 PM MST Fri Dec 1 2017

...Significant snowstorm expected for parts of Western Wyoming
later Saturday night through Sunday night and over into parts of
Central Wyoming Sunday night and Monday Morning...

.A cold storm system over the southern Gulf of Alaska will dive
southeast towards the area this weekend. Snow is expected to
become widespread across the northwest mountains Saturday evening
and then spread southeast across the area. Snow, possibly heavy
at times, will continue Sunday and into Sunday night. The snow
will be accompanied by periods of gusty southwest wind Sunday,
shifting to the northwest Sunday evening. Areas of blowing and
drifting snow will likely develop. Heavy snow will also be quite
possible from Eastern Sweetwater County over to Casper Mountain
Sunday night through Monday morning.


Star Valley-
Including the cities of Afton, Alpine, Star Valley Ranch,
and Thayne

101 PM MST Fri Dec 1 2017

...WINTER STORM WATCH REMAINS IN EFFECT FROM LATE SATURDAY NIGHT
THROUGH LATE SUNDAY NIGHT...

* WHAT...Heavy snow possible. Plan on difficult travel conditions.
  Total snow accumulations of 4 to 6 inches, with localized
  amounts up to 8 inches, are possible.

* WHERE...Star Valley.

* WHEN...From late Saturday night through late Sunday night.

* ADDITIONAL DETAILS...Significant reductions in visibility are
  possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Watch means there is potential for significant
snow, sleet or ice accumulations that may impact travel. Continue
to monitor the latest forecasts.

The system that will bring the Wyoming snow over the weekend is approaching Pacific
Northwest late Friday as noted in this water vapor movie.