{"id":2107667,"date":"2026-08-23T14:10:28","date_gmt":"2026-08-23T11:10:28","guid":{"rendered":"https:\/\/analyse.optim.biz\/?p=2107667"},"modified":"2026-08-23T14:10:28","modified_gmt":"2026-08-23T11:10:28","slug":"snowbrains-forecast-multi-wave-storm-targets-south-america-through-monday","status":"publish","type":"post","link":"https:\/\/analyse.optim.biz\/?p=2107667","title":{"rendered":"SnowBrains Forecast: Multi-Wave Storm Targets South America through Monday"},"content":{"rendered":"
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\"Snowfall
Credit: NOAA\/NCEP GFS<\/figcaption><\/figure>\n
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The South America snow forecast turns active Monday night, with repeated waves capable of delivering 143-261 cm<\/span> at Nevados de Chill\u00e1n by Monday morning.<\/strong> The Santiago-area resorts, Portillo, Las Le\u00f1as, and northern Patagonia also receive substantial refreshes, while Cerro Castor stays on the fringe. Snow begins dense and wind-affected before trending lighter later in the week. Confidence is strongest from Monday afternoon, August 24, through Monday morning, August 31. Cerro Castor\u2019s current mountain report<\/a> shows its lifts closed, so the light accumulation there is unlikely to change lift-served options without an operational update.<\/p>\n

Snow develops over the south-central Andes Monday evening, then spreads into the central Andes overnight and Tuesday.<\/strong> The individual models converge on a widespread Tuesday-Wednesday snow period and on lift-impacting wind, but they diverge on the central-Andes onset by roughly half a day, peak intensity, and snow-level height. Snow levels range from about 1,100-3,000 meters in the central Andes and 900-2,000 meters farther south, favoring upper-mountain snow with wetter precipitation near some lower bases. SLRs<\/a> of 6-10 indicate very dense to dense snow. Exposed gusts of 60-110 km\/h could slow or suspend upper lifts during the strongest bursts.<\/p>\n

Snow briefly eases in places Thursday, but another organized pulse crosses the mainland resorts Thursday into Friday.<\/strong> The individual models generally converge on renewed snowfall timing and a drop in snow levels, while diverging on intensity, the snow-level floor, and the severity of wind impacts. One solution is notably weaker in the central Andes. Snow levels span roughly 700-2,500 meters, lowest in northern Patagonia, with exposed gusts generally 50-90 km\/h. Central-Andes SLRs improve to 11-14, producing moderate to locally light snow, while 8-10 SLRs farther south keep the snow denser. Periodic lift holds remain possible where ridge winds peak.<\/p>\n

A final weekend reload should taper Monday morning, while a separate Tuesday-Wednesday southern wave could add a speculative 5-20 cm<\/span>.<\/strong> Through Sunday, the individual models converge on continued mainland snowfall and lower snow levels, but diverge on the exact peak timing, localized intensity, snow-level floor, and wind impacts. The central Andes trend toward 12-16 SLRs, so the later snow should ski lighter, while the southern Andes remain closer to 9-12. After Monday morning, the guidance splits sharply: two longer-range solutions generate meaningful snow from Nevados de Chill\u00e1n through Corralco and northern Patagonia, while the others are much lighter. Confidence drops quickly for that separate wave.<\/p>\n

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    South America Snow Forecast Resort Totals (Mon Aug 24 \u2013 Mon Aug 31)<\/h2>\n