This app was mentioned in 5 comments, with an average of 2.60 upvotes
PYKL3. https://play.google.com/store/apps/details?id=com.MyPYK.Radar.Full&hl=en
Edit: Oh, NVM. You are looking for windows application. I thought you meant Android. I will still leave the link up.
Many chasers use PYKL3 for on the go, real time radar. I watched a cyclone pass within a few miles of my house. Luckily it was in the clouds, and as far as I know, nothing touched down.
pyckl3 and radarscope are great mobile apps
Dunno about widgets, but for apps,
If you want radar data,
Nothing beats pykl3.
https://play.google.com/store/apps/details?id=com.MyPYK.Radar.Full&hl=en