Probabilistic Heavy Snow and Icing Discussion NWS Weather Prediction Center College Park MD 438 AM EDT Wed Apr 30 2025 Valid 12Z Wed Apr 30 2025 - 12Z Sat May 03 2025 ...Rockies... Days 1-2... Positively-tilted trough over the northern Rockies this morning with a vort lobe over the Bitterroots will drift south through Thursday. Focus for precip is along a surface boundary ahead of the upper trough axis with light to moderate rates over WY today and CO tonight Thursday. Snow levels will be elevated - around 8000ft in WY and 9000ft in CO. Day 1 snow probs for >6" are around 30% in the southern Absarokas/Wind River and 40-60% over the Bighorns. Day 1.5 snow probs for >6" are 40-70% through the Front Range and the Mosquito Range. The probability of any freezing rain across CONUS is less than 10%. Jackson