I created an account just to post this.
I'm so terribly disappointed with this decision. Windy was my go-to weather app for years. I used the 6 and 12-hour weather radar time range every morning to see what happened overnight so I could prepare for my day. I watch fronts as they move through my area because my partner has a chronic pain condition that is exacerbated by pressure changes. It goes without saying that I can't do that anymore. At least, not without paying.
I'll take the devs at their word and assume that this isn't just a cash grab. I'll assume that they do want to create and implement new feature for Premium users. Fine. Charge for those new features when they're ready. Cutting features that have been free for years does not reward the Premium users. They have the same functionality they always did. This decision only punishes free users.
The devs say they don't want ads because it ruins the user experience. That's their right to make that call, but I was a user, and I'd rather have an ad than a paywall.
I've seen paywalls like this go up with other apps and sites, and one thing has been the same every time: no one thinks to themselves, "Boy, this site just took something useful away from me. That makes me want to give them money to get it back!"
Sure, you'll pull in some more money, and let's be honest - that's the point. But you've lost a tremendous amount of goodwill, mine included.
I've uninstalled the app and removed the site from my bookmarks. I have to find a new weather app, and I doubt I'll find one as good as Windy used to be.