Yeah this course was released 7 years ago from what I see.  It was accurate at the time of release.  Unfortunately if a company makes changes to their model it could break your code.
The lesson is still good from the standpoint of HOW to do it.  The task now is just finding a resource that allows the interaction that they used to provide.

I seem to recall that Weather Underground changed some things to part of their subscription service. That may be one of them.  Can't blame them - they are a business and have to pay the bills too.

Bob, I teach a much better method of getting data from the web now using APIs. See these: Text Messages, UTC Time, Developer 32, Get Data from Web API