BBS: TELESC.NET.BR Assunto: HVYSNOW: Probabilistic Heavy Snow And Icing Discussion De: COD Weather Processor Data: Sun, 3 May 2026 08:33:20 +0000 ----------------------------------------------------------- FOUS11 KWBC 030833 QPFHSD Probabilistic Heavy Snow and Icing Discussion NWS Weather Prediction Center College Park MD 433 AM EDT Sun May 3 2026 Valid 12Z Sun May 03 2026 - 12Z Wed May 06 2026 ...Sierra Nevada... Days 1-2... Broad, not that deep upper low off CA will drift toward the SF Bay area through tonight, then drift to SoCal through Tuesday when it opens to a trough and ejects east. Modest moisture plume will interact with the Sierra Nevada from the south with precip onset expected this afternoon. Snow levels initially around 9000ft drop to around 8000ft late tonight. Day 1 snow probs for >6" are around 20% in the High Sierra. The south movement of the low brings some prolonged flow to the Sierra Nevada with snow levels down to around 7500ft. Day 2 snow probs for >6" are 40-60% across the High Sierra. ...Wyoming and Colorado... Days 2/3... Strong ridging north of the CA low will amplify over the northeast Pacific into the Yukon through tonight and promote troughing to surge down the Canadian Prairies tonight and the northern Plains Monday. Meanwhile the SWly jet downstream of the CA low will surge to the central Plains Monday, aiding left exit dynamics. Precipitation will expand over southern WY and northern CO Monday afternoon into Tuesday ahead of the cold front with high snow levels initially >9000-10,000ft. On Tuesday, the cold front (and precip focus) will push south through eastern CO with snow levels lowering to 6000-7000ft behind the boundary that will dam up east of the Divide, keeping snow levels >8000ft on the west side. Modest to locally heavier snow should set up over parts of southern WY through CO via easterly/upslope flow (e.g., Laramie and Medicine Bow Mountains) with additional modest snow over the Bighorns and Wind River Range through Tuesday evening before tapering off as the focus shifts east onto the Plains Wednesday. Day 2 snow probs for >6" are 20-30% on the Wind River Range and Bighorns and 30-60% on the south Laramie and CO Front Range. Day 3 snow probs for >6" are nearly identical for the Wind River/Bighorn with greatly expanded coverage over south WY through central CO Ranges down to the northern Sangre de Cristos. Probs for >12" are 40-70% along the Front Range in what will be an impactful storm though should be mainly seen as beneficial/drought relief. The probability for significant icing over one-tenth of an inch is less than 10 percent across the CONUS. Jackson $$ = = = 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]