ID Pocatello ID Zone Forecast Cloudy with a chance of snow. Highs 32 to 39.IDZ068-070-252300-Lost River Valley-Challis/Pahsimeroi Valleys-Including Howe, Arco, Mackay, Chilly, and Challis256 AM MST Sat Jan 25 2020.TODAY...Partly sunny. A chance of light freezing...Link to Article