Mid-September Andes System
1 resort in the path, 33cm at the biggest. Likely — the models agree on this one.
+33CM
Predicted at Volcán Osorno
Storm
Sep 17–19
1 resort in the path
Peak
Sep 19
20cm at Volcán Osorno
Predicted
33cm
Volcán Osorno
Confidence
Likely
Updated
Sep 10, 06:30 UTC
SnowSure Forecaster
Written from the blend and the model spread · updated Sep 10, 06:30 UTC
A storm watch has been issued for the Mid-September Andes System due to an incoming Pacific system expected to bring significant snowfall. Volcán Osorno is projected to receive 32.9 cm of snow over the event window, with the heaviest accumulation of 19.8 cm occurring on the final day. With three models agreeing on this average, Volcán Osorno stands to benefit the most from this system. Other resorts in the region may miss out on substantial snowfall if the storm's trajectory shifts or if model agreement does not tighten, which could lead to a reassessment of the forecast.
Snow by day
Sep 16 – Sep 20, 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.
Volcán Osornobase 1,230 m · summit 1,760 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 2026-09-10 06:30 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 2026-09-09 with 33cm forecast at Volcán Osorno.
