Your iPhone gives you weather forecasts right from the get-go, but it's now ready to shape those forecasts as well. Dark Sky has given its iOS app a bigoverhaul that, if you like, uses the barometer on your iPhone 6 or 6 Plus to contribute pressure readings. The hope is that these will dramatically improve short-term forecasts in the future -- you'll know that it's about to rain because iPhones nearby gave you a heads-up. There have been apps that crowdsourced pressure data before, but rarely with the intent to directly improve forecasts -- and not on the scale of Dark Sky, one of iOS' best-known weather tools.

http://www.engadget.com/2015/06/21/d...rometric-data/