The Forecast Range graphs give you a behind-the-scenes look at the forecast.
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This feature will move to a new "Pro" subscription plan later in 2025.
We use data from multiple global and regional weather models to create the forecast in OpenSnow. This tool makes it easy to see if forecast models are in tight agreement or if there is a wide range of potential outcomes.

What do the lines and dots mean?

Each line and/or dot represents one run from the individual weather models.

Most models are run/updated every 6-12 hours, and each run produces a different forecast.

We usually show the most recent three runs of each weather model, with thinner lines showing previous model runs.

Mouse over or tap on any line and/or dot to see a pop-up with more information.



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.
  • Dig into the details. If you have experience looking at weather model data, and trust certain models or higher-resolution models, you'll be able to isolate your favorite data.
What weather data is available to view?

You can toggle the graphics between:

  • Total Snowfall
  • Snowfall (12 hr) available in the 10-day view
  • Snowfall (6 hr) available in the 5-day view
  • Snowfall (3 hr) available in the 3-day view
  • Snowfall (1 hr) available in the 1-day view
  • Snow Level (the elevation at which snow turns to rain)
  • Temperature
  • Total Precip
  • Precip (12 hr) available in the 10-day view
  • Precip (6 hr) available in the 5-day view
  • Precip (3 hr) available in the 3-day view
  • Precip (1 hr) available in the 1-day view
  • Wind Speed
  • Wind Gust


How can the timeframe be adjusted?

You can toggle the timeframe between:

  • 10 days
  • 5 days
  • 3 days
  • 1 day
When viewing the Forecast Range on our iOS and Android apps, you can also pinch-to-zoom/expand.



For snowfall and precipitation, the time displayed is the end of that period.

For example, if the data readout shows 6 inches of snow accumulation for 12-hr snowfall on Saturday at 7pm, this means that the forecast is for 6 inches of snow from the 12 hours between 7a to 7p on Saturday. 

What models are available to view?

Not all models are available for all weather variables or all geographies.

  • All Models: Shows all available models for that weather variable and that geography. The thick line represents the official OpenSnow forecast, which blends multiple models (not all visible models are used in the blend).
  • American (GFS): Resolution of 13km. Learn more.
  • American Blend (NBM): Resolution of 2.5km. Learn more.
  • American Hi-Res (HRRR): Resolution of 3km. Learn more.
  • Canadian (GDPS): Resolution of 15km. Learn more.
  • Canadian (RDPS): Resolution of 10km. Learn more.
  • Canadian Hi-Res (HRDPS): Resolution of 2.5km. Learn more.
  • European (ECMWF): Resolution of 25km. Learn more.
  • European AI (AIFS): Resolution of 25km. Learn more.
  • German (ICON): Resolution of 13km. Learn more.
  • German EU (ICON-EU): Resolution of 7km. Learn more.
  • German D2 (ICON-D2): Resolution of 2km. Learn more.


How are models compared?

When viewing "All Models", the data readout compares the maximum, minimum, and the official OpenSnow forecast.

For other models, the data readout compares the official OpenSnow forecast and the selected model, with an additional +/- percentage that denotes the difference between the official OpenSnow forecast and the selected model.

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Questions? Send an email to hello@opensnow.com and we'll respond within 24 hours.