This is a great idea that deserves support. A large part of my job involves working outdoors so weather/radar apps are something I follow and the following two are always on my start screen. Both have elegant UIs, are accurate, are well rated, and have developers who provide support and updates consistently.
Blue Skies (free, but with in-app purchase of $1.99 to upgrade live tile and add radar)
Appy Weather ($3.99, has option to try for free for 7 days)
My favorite weather radar app, and whose radar live tile is always pinned on my start screen, is:
Weather Radar Live (free, has several upgrade purchase options. I spent $1.98 to remove adds and get a zoomable live tile)
For the fitness buffs, two apps to track running, walking, cycling, etc .Again, both are energetically supported by their developers, consistently updated, and well rated. I personally use the first one as it has modes for walking and cycling. The second, which is tailored for running, I want to try soon.
Run the Map (free, but has a page to donate to support development of the app)
Track Runner (free, but again has a page to donate to to support development)
Finally, one that I'm saving for myself on the 23rd as I liked what I saw using the trial version, to store all my passwords, user names,card details, etc for safekeeping and quick recall.:
Enpass ($9.99)