Late-September Andes System
3 resorts in the path, 73cm at the biggest. Likely — the models agree on this one; likely at 2 of 3 resorts.
+73CM
Predicted at Corralco
47–123cm across the models
Storm
Sep 24–26
3 resorts in the path
Peak
Sep 24
60cm at Corralco
Predicted
73cm
Corralco · 47–123cm across the models
Confidence
Likely
Likely at 2 of 3 resorts
Updated
Sep 23, 00:30 UTC
SnowSure Forecaster
Written from the blend and the model spread · updated Sep 23, 00:30 UTC
Current prediction: 73cm for Corralco between 2026-09-24 and 2026-09-26, 73cm our central figure. The biggest day is 2026-09-24 at 60cm. Also in the path: Las Leñas 42cm, Batea Mahuida 38cm. Confidence is likely: the models agree on both the window and the magnitude. By resort: Likely at 2 of 3 resorts. On day one we said 126cm for Corralco; that is the number we are measured against. These figures are re-read from the latest model blend; each entry in the log keeps what we said at the time.
Forecast log
Every entry, newest first. Nothing is overwritten.
- Day 11·Sep 23·Likely·73cmLanded
Late-September Andes System: 72.8cm for Corralco (47.2–123cm)
The window opened today. Final prediction: 72.8cm for Corralco, 41.7cm for Las Leñas, and 38cm for Batea Mahuida over the window from 2026-09-24 to 2026-09-26. Corralco is expected to see the biggest day on September 24 with 59.8cm. Since our initial call, the top total has decreased by 53cm, and the window start has shifted one day later. Confidence remains likely for Corralco and Las Leñas, while we are watching Batea Mahuida closely.
Window Sep 24–26 · Corralco
- Day 10·Sep 21·Likely·73cm(-53)
Late-September Andes System: 72.8cm for Corralco (47.2–123cm)
Day 10: the window start moved one day later, and totals are down 53cm since the previous entry. The forecast window is now set for 2026-09-24 to 2026-09-26, with Corralco expected to receive 72.8cm, Las Leñas 41.7cm, and Batea Mahuida 38cm. The biggest day for all resorts is projected for September 24, with Corralco leading at 59.8cm. Confidence remains likely at two of the three resorts, while we are watching Batea Mahuida closely as its trend is new.
Window Sep 24–26 · Corralco
- Day 9·Sep 20·Likely·126cmFirst prediction
Late-September Andes System: 125.8cm for Corralco (45.7–205.8cm)
The prediction for the late-September Andes System, from September 23 to September 27, indicates significant snowfall totals, with Corralco leading at 125.8cm (range 45.7–205.8cm). The overall pattern suggests a favorable setup for snow accumulation across the region. Corralco and Nevados de Chillán are likely to see the most substantial totals, while Cerro Catedral and Las Leñas also stand to benefit. However, Las Araucarias, Cerro Perito Moreno, and Batea Mahuida are currently in a watching phase, with potential for improvement. A shift in the storm's trajectory or intensity could alter these predictions.
Window Sep 23–27 · Corralco
Snow by day
Sep 23 – Sep 27, with a day either side. For each resort: where the freeze line sits against the mountain, then what falls — snow in cm, rain in mm — and the day read from those two numbers.
Corralcobase 1,440 m · summit 2,400 m
—cm snow
no daily data
Las Leñasbase 2,240 m · summit 3,430 m
—cm snow
no daily data
Batea Mahuidabase 1,650 m · summit 1,900 m
—cm snow
no daily data
No daily series on file for these resorts yet.
Rain / snow line
Base to summit for each mountain, with the snow line cut across them.
The system
700mb flow — where the storm is, and what is steering it. Pins sized by forecast total.
72-hour snowfall forecast for the same window.
In the path
Forecast, not observation — none of this has fallen yet. Totals are across the window. We will post what fell when the window closes.
Last updated 2026-09-24 00:30 UTC. SnowSure scans a blend of seven weather models twice daily and flags systems clearing 30cm over 72 hours, three to fourteen days out. This watch opened on 2026-09-14 with 47cm forecast at Corralco.
