The best out there
I have a habit of hoarding weather apps. If it exists, Ive probably got it installed, and I use it.
Wunderground is hands down my favorite. Its the most complete out there: it has the best notification widget, the WatchOS app is excellent.
Its data is first rate, and is presented clearly, and includes webcams so you can look and see outside at your destination.
If you want to dig deeper, it has blogs, videos, and educational resources.
For the full experience, download Wundergrounds storm app, which shows winds & precip amazingly well. Im not sure why Storm is split into its own app, but its excellent as well.
Pariah Zero about
Weather Underground: Local Map, v5.9.2