BBS: TELESC.NET.BR Assunto: HVYSNOW: Probabilistic Heavy Snow And Icing Discussion De: COD Weather Processor Data: Sat, 2 May 2026 18:53:22 +0000 ----------------------------------------------------------- FOUS11 KWBC 021853 QPFHSD Probabilistic Heavy Snow and Icing Discussion NWS Weather Prediction Center College Park MD 253 PM EDT Sat May 2 2026 Valid 00Z Sun May 03 2026 - 00Z Wed May 06 2026 ...Sierra Nevada... Days 2-3... Broad upper low near 40N/130W (west of NorCal) this evening will continue southward overnight then turn eastward and move into central CA late Sunday night/early Monday. Modest moisture plume will be focused south/east of the Sierra, but incoming height falls and upslope will still yield light to modest snow for the High Sierra starting Sunday afternoon. Snow levels will be high to start (>9000ft) but then trend lower to around 7000-8000ft as the upper low approaches and slowly passes through the region overnight Monday into Tuesday. By the end of this forecast period, the upper low is forecast to be nearing the Grand Canyon with lingering snow over the Sierra and rising snow levels. WPC probabilities for at least 6 inches of snow are >50% above about 8000-9500ft (north to south). ...Wyoming and Colorado... Day 3... In response to building ridging into NW Canada Monday morning, troughing will sink into the Northern Plains and the Great Lakes with an attendant and strong cold front racing southward from Montana into Wyoming. At the same time, the upper low over CA will continue to favor SW flow across the Four Corners as the upper jet arcs into the region. Precipitation will expand across WY and CO Monday into Tuesday ahead of the cold front with high snow levels initially >9000-10,000ft. By early Tuesday, cold front will push southward through WY and eastern CO with snow levels lowering to 6000-7000ft behind the boundary that may slow and hang up along the Divide, keeping snow levels >8000ft on the west side. Modest to locally heavier snow could set up over parts of southern WY into northern CO via easterly/upslope flow (e.g., Laramie and Medicine Bow Mountains) with additional modest snow over the Bighorns and Wind River Range. Snow will continue past the end of this forecast period. Through 00Z Wed, WPC probabilities for at least 6 inches of snow are >50% above 8000-9500ft in northern WY and above 8500-10,000ft in CO. For at least 2 inches of snow, WPC probabilities are >50% to as low as 7000-8000ft along the WY/CO border through the Medicine Bow Mountains. The probability for significant icing over one-tenth of an inch is less than 10 percent across the CONUS. Fracasso $$ = = = To unsubscribe from WX-STORM and you already have a login, go to https://lists.illinois.edu and use the "Unsubscribe" link. Otherwise email Chris Novy at cnovy@cox.net and ask to be removed from WX-STORM. --- SBBSecho 3.28-Linux * Origin: Capitol City Online (1:2320/107) ----------------------------------------------------------- [Voltar]