Snow and rain showers arriving Tuesday evening into Wednesday morning

A system moving into the region this evening with rain, snow showers and freezing drizzle. This storm is looking to bring in about 2-4" of new snow for Teton County Idaho and Wyoming, and about 2-4" of new snow for Island Park. Mixed precipitaion for the Snake River Plain, with gusty winds. Sustained winds are going to be above 20 MPH for most of Wednesday.

As this storm departs Wednesday night, we'll see cold, below freezing temperatures for Thursday and Friday.

WINTER WEATHER ADVISORY IN EFFECT FROM 9 PM THIS EVENING TO
9 AM MST WEDNESDAY

• WHAT…Mixed precipitation expected. Total snow accumulations
  of up to one inch and ice accumulations of a light glaze.
• WHERE…The eastern Magic Valley, most of the Snake River plain,
  the Wood River foothills and the Teton Valley. It appears as
  though the larger cities of American Falls, Pocatello,
  Blackfoot, and Idaho Falls will see little or no ice, but to the
  west of this part of the Interstate 15 corridor there will be
  icy conditions on roads headed to the Arco Desert such as U S
  Routes 20 and 26.
• WHEN…From 9 PM this evening to 9 AM MST Wednesday.
• IMPACTS…Travel will be difficult and hazardous on most
  highways and streets in the affected area. Wind of 20 to 30 mph
  with higher gusts will also hamper driving conditions.

storm coming in from the Pacific is bringing large amounts of
warm moist air into the northern Rockies and Great Basin this
evening. The moist air first moves in well above the ground, which
stays cold. This warm layer will be able to at least partially
melt the snow crystals as they fall, which then re-freeze on
objects like sidewalks and roadways as the precipitation re-enters
the below freezing temperatures near the ground. This will occur
mainly tonight and into Wednesday morning, making for a slick and
very hazardous travel situation for anyone planning or expecting
to travel through eastern Idaho tonight and Wednesday.