About SnowTally

SnowTally answers one question for skiers and riders in the US: what is the chance of 3 or 6 inches of new snow at a resort in each of the next 7 days?

Instead of a single snowfall number, SnowTally will show snow probabilities based on NOAA's National Blend of Models, and how accurate the method has been at a nearby weather station.

How the pages are made

On resort pages, the numbers and the resort facts are generated by code from public data: NOAA's National Blend of Models (NBM), snow observations from SNOTEL and GHCN-Daily, lift and run data from OpenSkiData, and elevations from USGS 3DEP. There are no AI-written resort descriptions. Explanatory pages and guides, such as this one, are drafted with AI assistance and reviewed before publishing.

The methodology page explains the calibration and the after-the-fact test behind the accuracy figures.

Independence and funding

SnowTally is an independent website operated from Sweden. It is not affiliated with, endorsed by or connected to any ski resort, OpenSnow or other forecast service, NOAA, the National Weather Service or any other agency. Resort names are used only to identify locations.

The site is free to use and is funded by display advertising. Advertising never influences the numbers. We do not use affiliate links and we do not publish gambling or betting content.

Data sources

• Forecasts: NOAA/NWS National Blend of Models and WPC data, post-processed by SnowTally.
• Snow observations used to test the forecasts: USDA NRCS SNOTEL and NOAA NCEI GHCN-Daily.
• Elevations: USGS 3D Elevation Program (3DEP).
• Lifts and runs: OpenSkiData / OpenSkiMap.org and OpenStreetMap contributors.

Questions or corrections? Contact us.