Comment by unstyledcontent

It's a fair question. There's a lot of free sources of data out there. This app is powered by our own Weather API: https://www.xweather.com/weather-api

The data is aggregated from global meteorological offices and other sources (some free, some paid). Some of the datasets are proprietary to us. For example, the lightning layers come from our own lightning detection network, and certain forecasts (like hail) are developed in-house.

This app was built to showcase our data. The vector mapping tools are also available via API. https://www.xweather.com/mapsgl