Probabilistic Heavy Snow and Icing Discussion NWS Weather Prediction Center College Park MD 303 AM EDT Wed Oct 23 2024 Valid 12Z Wed Oct 23 2024 - 12Z Sat Oct 26 2024 ...Northern Rockies... Day 1... Mid-level low off the WA/OR coast opens into compact shortwave and ejects east over the OR Coast this afternoon before weakening as it reaches western WY late tonight. Lee-side low pressure develops over northern WY overnight which aids upslope flow back on the western WY terrain where snow reaches moderate rates overnight. Snow levels drop from around 8000ft to 7000ft overnight during this precip, particularly around greater Yellowstone. Day 1 PWPF are 10-40% for >4" over the northern Absarokas in southern MT and in the Tetons. The probability of significant ice across the CONUS is less than 10 percent. Jackson