Savoie Snow separates four things that look alike on screen: what is measured, what a model forecasts, what an image shows and what an official source states. This page explains where each piece of data comes from and how to read its limits.
An observation is a measurement taken at a precise place and time, like the one from our Albertville station. A forecast is a model calculation at a given altitude: it may differ from what is measured on the spot. A webcam shows a landscape; it measures neither snow, nor temperature, nor the state of a road. Official information (a pass opening, an avalanche bulletin) comes from the relevant authority, with its date.
Temperatures in degrees Celsius, wind in kilometres per hour, forecast snow in centimetres, altitudes in metres. Every place forecast states the altitude it is calculated for: a resort has two points (village and top of the ski area), a pass or a summit has its own altitude, and the temperature of a nearby town is never used instead.
Forecast snow over seven days is a total of announced snowfall: it is not the depth of snow on the ground, which also depends on settling, melting and wind. The air temperature is not the water temperature of a lake. The rain-snow line is an estimate derived from the model’s freezing level; it does not replace a bulletin.
Missing data is shown as unavailable (“—” or a sentence), never replaced by zero or by an estimate. If an official source is not available, the page says so and links to it.
The “last revised” date of a page refers to its text. The time of a measurement, a forecast or an image is that of the source and is shown next to the data. Pages are regenerated roughly every ten minutes; forecasts are refreshed every hour at most.
| Source | Owner | Data | Nature | Frequency | If it fails |
|---|---|---|---|---|---|
| Albertville weather station | Savoie Snow (Station Davis Vantage Vue, 355 m) | Temperature, humidity, wind, pressure, rain | Observation | Local sensor about every 15 s (used if less than 3 min old), otherwise the public WeatherLink bulletin (1 min), otherwise the WeatherLink API (15 min) | The block says so and keeps the time of the last measurement; no value is invented |
| Open-Meteo | Open-Meteo.com | Temperature, weather, wind, forecast snow, freezing level, at a stated altitude. Daily snow: the higher of the model’s value and a value recalculated hour by hour from the precipitation and temperature at the point (snow below 0 °C, mixed up to 2 °C, 1 mm of water = 0.7 cm) | Model forecast | Updated every hour at most; one request shared by the ski pages, the map and the landing pages | The page says “unavailable”, with no substitute figure |
| Webcams | Operators credited under each image (Skaping, Trinum / webcam-hd.com, Windy, Compagnie du Mont-Blanc, resorts and tourist offices) | Images | Periodic image | Set by each operator; the image is loaded directly from the operator | A missing or old image is not replaced by another view |
| Savoie Route | Département de la Savoie (local authority) | Mountain pass status, road conditions by sector, roadworks and incidents | Dated official information, reproduced as is | Re-read every 10 minutes at most | The page links to Savoie Route; no status is assumed, and nothing is “open” by default |
| Bison Futé (non-motorway national roads) | DIR / transport.data.gouv.fr, Licence Ouverte 2.0 | Road events on national roads | Dated official information | About every hour | No event is shown, and the page says so: no event is not the same as no incident |
| Official statuses (roads, passes, snow reports, avalanches) | Authorities and operators named on each page | Openings, restrictions, reports | Dated official information | That of the source | Savoie Snow links to the source and never infers a status from an image or a forecast |
Text last revised on . Sources and their terms may change; the pages concerned are updated accordingly.