cryptoz writes: "Canadian software company Cumulonimbus is building pressureNET, a free and open source Android app that taps in to the environment sensors on new phones and is now a quickly growing weather network. They're collecting about 250,000 atmospheric pressure measurements per day which they are livestreaming to scientists who are working on new methods of thunderstorm forecasting. More data density is needed first, however. Luckily, the Samsung Galaxy S4 will join the existing fleet of barometer-carrying phones which will enable further growth and better science experiments. They provide a data visualization website where you can view live graphs of the collected data."