Early-September Andes System
1 resort in the path, 34cm at the biggest. Watching — the models see it but do not yet agree closely.
+34CM
Predicted at Antillanca
Storm
Sep 8–11
1 resort in the path
Peak
Sep 10
25cm at Antillanca
Predicted
34cm
Antillanca
Confidence
Watching
Updated
Sep 3, 06:31 UTC
SnowSure Forecaster
Written from the blend and the model spread · updated Sep 3, 06:31 UTC
A storm watch has been issued for the Early-September Andes System due to a developing Pacific system that is expected to bring significant snowfall to the region. Antillanca is projected to receive 34 cm of snow over the window from September 8 to September 11, with the heaviest snowfall occurring on the biggest day, which is forecasted to deliver 25 cm. The model consensus, with 4.5 models agreeing on average, supports this outlook. Other resorts may miss out on substantial snowfall if the system shifts or weakens. A tightening of model agreement or a shift in the forecast window could lead to adjustments in the snowfall predictions.
Snow by day
Sep 7 – Sep 12, 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.
Antillancabase 1,040 m · summit 1,540 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 2026-09-03 06:31 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 2026-09-03 with 34cm forecast at Antillanca.
