Don't plenty of android devices have barometers? I expect Google being Google and recording all that data unless you opt out.
Would that be practical for weather forecasting or not really?
Would that be practical for weather forecasting or not really?
The data that would be most valuable to initial conditions is upper-atmosphere winds -- this is the kind of data given by weather balloons. In clear air there's no great way to measure this from either the ground or from space.
One important supplemental data source here are aviation reports, from planes flying at altitude and particularly trans-oceanic routes. When air traffic was largely curtailed during the early phase of the Covid pandemic, weather forecasting suffered a bit for the lack of data (see eg https://www.ecmwf.int/en/about/media-centre/news/2020/drop-a...).
What are the conditions at 5000 feet, 10000, etc? What is the location of the jet stream and its strength? The reduced number of (e.g.) weather balloons is hindering forecasts (per the links).