South America Daily Snow
By Luke Stone, Forecaster Posted 2 days ago June 28, 2025
Weekend Snow Showers, Then a Break
Summary
Snow continued to fall across the Andes last week, resulting in more powder days and generally good conditions. Over the next few days, showers will linger in the north, but for the most part, conditions will remain dry. The models disagree about a potential storm around the 3rd, with the more likely timeframe for the next significant system being next weekend.
Short Term Forecast
Sorry for the delay between posts, everyone. I had a severe stomach virus this week that kept me out of commission for several days. Doing better now, and posts will return to the regular posts next week.
Several rounds of snow over the last four days brought fresh powder to the resorts. Portillo scored 18 to 20 cm a few days ago for a nice early-season pow day, while Cerro Bayo received 5 to 25 cm from Thursday through Friday. Corralco saw 5 to 10 cm on Wednesday, Thursday, and Friday to soften things up nicely. It's been a solid start to the season and several more resorts are opening this weekend, including Las Lenas, Cerro Catedral, Caviahue, Pertio Moreno, Cerro Castor, Pillan, and Antillanca.
Snow showers will continue in the north over the next few days, but only minor accumulations are expected. During the middle of next week, around Wednesday or Thursday, another storm is possible. The models disagree on whether the storm will track far enough north to have any impacts. You can see this discrepancy in the image below, which is the forecast range graph for Corralco.
Each line represents one run from one of the individual weather models, with the brighter lines showing more recent model runs.. Starting on Thursday and Friday, some recent model runs indicated that the next storm would track into the Andes. However, the majority of models, and therefore the mean, indicated by the thick, dark blue line, keep this storm to the south.
The models are perhaps more in step on when the next storm will arrive, which is sometime next weekend. It's too early for details but significant snow is a possibility at this time. You can see both the potential midweek and weekend storms in the GIF for the upper-level pattern below.
Extended Forecast
The long-range models are currently showing a lot of inconsistency, and there is no strong signal for additional major storms. There is no sign of a strong storm blocking ridge either. Given the uncertainty in the models, we'l' have to wait a few more days to get a better idea of what the second week of July looks like.
Next post on Monday or Tuesday
Thanks for reading the South America Daily Snow!
Luke Stone
Forecaster, OpenSnow
Announcements
NEW: Forecast Range Graphs
You can now view individual forecasts from global and regional high-resolution weather models in OpenSnow. This includes forecasts from the GFS, ECMWF, HRRR, and ICON models, as well as the OpenSnow blend.
The graphs give you a behind-the-scenes look at the forecast and make it easier to see if the forecast models are in tight agreement or if there is a wide range of potential outcomes over the next 10 days.
Note: This is currently only available in the OpenSnow iOS app and website (OpenSnow.com). Android will be available soon.
Getting Started
- Go to any location screen.
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- Tap "View Interactive Chart" in the app.
- Adjust the model, timeframe, or data view.
Why is the Forecast Range helpful?
Understand if there is high or low confidence in the forecast. If all models show a similar forecast, there is higher confidence in the forecast, and vice versa.
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