Did a quick search on the this site for the iOS myPWS app and didnt see it come up. That app allows me to leverage my Tempest connection to weather underground. There are pay features (of which there are many) - i spent 3.99 for the Apple Watch integration. It supports complications is working well. I’d just assume have the Tempest app integrated to reduce the connections to different things - but this is something I feel people may want to take a peek at while the Tempest app becomes more robust.
I have that app as of a few days ago, and it’s pretty nice. Haven’t bought any of the add-ons, but for 4 bucks, will probably by Watch integration.