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You have to get a good weather app, and this one is full-featured and attractive.
All of the expected forecasts are available, along with weather maps.
The Chromebook has a front-facing webcam, and this app takes good advantage of it. In addition to allowing snapshots from the camera, Webcam Toy also has a number of fun effects like the one shown here.
I use Evernote on every device I use, and this app makes it easy to do with Chrome.
I run it in a window on the Chromebook and use it to both capture information and write articles.