How to read a seven-day snow forecast
A practical way to compare daily snowfall amounts, snow chances, source times and mountain locations.
Start with the dates, not the total
The seven-day total is a useful first scan, but it combines different forecast days. On PowderPeek, Today means the remaining part of the local day. Snow that fell before the forecast was saved belongs in the observed or reported snow view, not in that remaining-day estimate. Open a day to read its daytime and overnight weather together.
A large total late in the week is a different planning signal from snow expected tonight. Revisit the daily distribution as the trip approaches. This site does not assign a probability or an accuracy score to the seven-day sum.
Read the number and the weather outlook together
Zero means the amount feed estimates zero accumulation. It does not guarantee that flakes cannot fall. The weather text can mention snow showers while the numeric snowfall field remains zero; PowderPeek displays “Snow possible” in that situation.
A dash means an unavailable amount. A value below 0.1 is a small positive estimate in the selected unit. If only some daily amounts are available, the total identifies the number of included days. Do not compare a three-day subtotal with another mountain’s complete seven-day sum as if they cover the same period.
Check where the model is forecasting
A resort name can cover terrain from a base village to a high ridge. The directory supplies a reference coordinate; the forecast provider chooses a grid or model location around it. U.S. NWS grid elevation is shown when available. WeatherAPI can return a nearby town, and the page identifies that name and its distance from the resort point.
If the returned location is a valley town, use the resort’s official forecast and mountain report as additional context. PowderPeek does not apply a guessed elevation correction or convert rain into a guessed depth of snow.
Distinguish a new collection from a new forecast
The background collection runs every 15 minutes, but each provider issues information on its own schedule. The Updated time tells you when PowderPeek saved the data. The NWS issue time and model retrieval time describe the underlying source. WeatherAPI results are normally reused for up to four hours.
When an update fails, the last successful forecast may remain visible with a delay notice. Review that notice before making plans. Check road authorities, resort operations and official advisories separately; the snowfall chart is not a road or avalanche forecast.
Sources and methodology
This guide explains PowderPeek’s published data methodology. See the NWS API documentation, WeatherAPI field documentation and the official sources on each mountain page for the underlying data.