By the way, the problem is that there is no radar station call in the URL...
h ttps://www.wunderground.com/radar/radblast.asp?
ID=&lat=41.79&lon=-87.91&label=Western%20Springs
If you put
LOT (Chicago NEXRAD, for example) after the equal sign it works. This is pretty elementary stuff, which means IBM will never figure it out...