The Cascades will nab another round of freshies Monday evening into Tuesday. Expect 4-9 inches at Mount Baker and perhaps 6-10 inches along a convergence zone near Stevens Pass. Crystal and areas south into N. Oregon should nab 4-7 inches. That system races through central Idaho during the day Tuesday (3-5) and into the Tetons and Wasatch in the late afternoon. Winds will be gusting from the south as the front approaches the Wasatch Tuesday early afternoon (70 MPH gusts). Strong winds will continue Tuesday evening before shifting NW to moderate early Wednesday.
The core of the cold front zooms through northern Utah around 4PM Tuesday bringing 2-3 hours of heavy snowfall (3-6 at the highest peaks), strong winds, deep freezing of layers below, and white out conditions. Light to moderate snow will be falling over the Tetons (Grand Targhee is open) through the period (3-6 inches by Wednesday morning).
The Wasatch sees a decrease of winds late Tuesday night as well as snowfall. An additional piece of energy moves back to the Wasatch Wednesday morning (Moderate) and should bring another 2-4 inches of snowfall during the day. Models show that energy getting hung up over the Wasatch through Thursday morning (Light snow). The caveat is a break in the action late Tuesday night, strong post frontal winds and the warm temperatures prior to the cold front Tuesday PM (50’s at 7,000 feet). Conditions will be variable depending on aspects, freeze layers and winds. Avalanche danger will also rise with the new snow surface due to drifting and cornices at the ridges. Snow densities will be light with “sink to the bottom” sections on Wednesday. The continued light snow on Wednesday through Thursday AM will help smooth things out (Total snowfall from Tuesday through Thursday will be 9-11 inches with no single deep event except for perhaps Tuesday night). Best days will be Wednesday and perhaps early Thursday.
Colorado models have been all over the map! Each day offers new solutions. Yesterday heavy snow was in the forecast for the front range Wednesday/Thursday. Today, the models show less snow with a focus towards the Colorado Wyoming border as well as south towards the 4 corners. Steamboat might deserve watching for Wednesday. I have not bought off on one solution. Light snow is likely Wednesday with perhaps moderate amounts near the Eastern Divide by Thursday morning (3-6). Updates will happen as the models buy off on a solution.