All the Javascript code is in that html page source. The Bootstrap and jQuery you can grab from their sites. I'm using their latest version for this.
All I did was go copy urls from the NOAA site and fetch just the images and data I wanted from them. Their web site is huge so you kind of have to poke around a bit but they have a lot of data you can get there.
I do have a very old version I played with years ago that I think did pinpoint your location on the Radar map. I'll try to find it and take another look at how I did that and if I can I'll add it to this app.