OpenWeatherMap looks fantastic - I definitely want to use their API in pressureNET. Thanks, I hadn't seen this before. We really want to focus our work on collecting large amounts of pressure data, so building top-level UIs and other features like regular forecasts hasn't been priority. But this API looks great.
A message to the `talk' OSM mailing list might attract some attention, although there may be a more appropriate list.
An idea I had was that maybe you could form an arrangement where any OWM apps include PressureNET reporting. (In fact the same for OSM apps, you could talk to some of the developers (there are lists of android apps on the OSM wiki) because I know a few apps already include optional reporting of other things to OpenXYZMap-like projects)
Also, I recently saw OpenWeatherMap[1], which seems like a project that would be aligned closely with you. I'd be interested to know if you've communicated with them/if you've got some sort of partnership going on?
[1]: http://openweathermap.org/