A lift, especially combined with wind, could bring in clouds and rain. Rises the pressure rapidly, the skies will probably clear and conditions will improve. The larger the change in pressure, the larger the likely weather change. How can I know of subtle pressure changes caused by weather? Is it likely I’ll need an umbrella today? Maybe the sun will come out shortly? Don’t just speculate, get a scientifically founded answer to all these questions. Please note: the Barometer only works with iPhone 6 and 6 Plus!
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