I've just switched the DNS entries for wx-now.com over to the v5 App, and I've turned off the v4 App and worker role. It'll take some time to transfer over the 360 GB of archival data, and to upload the 9 million rows of Gazetteer data, however. I've set up a virtual machine in my Azure subscription specifically to do that.
This has been quite a lift. Check out the About... page for the whole history of the application. And watch this space over the next few months for more information about how the app works, and what development choices I made (and why).
Just for posterity, here's what the v4 Current Weather page looked like:
Good night, v4. You had a good 8-year run. And good night, Katie Zoellner's lovely design, which debuted 15 years ago.