From ClimaCell Bags $15M to Predict Weather from Wireless Network Signals:

Boston storm
Boston storm

Storm stock image. Photo by Flickr user walknboston, used under a Creative Commons license (CC BY 2.0). Photo has been cropped to fit Xconomy publishing standards. https://www.flickr.com/photos/walkn/2608385213/ https://creativecommons.org/licenses/by/2.0/