If you're interested in learning more about the pirateweather data sources and process, you can check out this article which goes into great detail.

https://aws.amazon.com/blogs/publicsector/making-weather-for...

I'm relying on it in Canada now so I can certainly vouch for it in my area. We had a snowstorm and power outages during holidays and it was great to follow the graphs with regards to wind/gust and precipitations.

I switched to Accuweather after IBM ruined WeatherUnderground App. Still not as good as the old Wunderground app but it is 90-95% what I liked about the WU

accuweather sells geolocation data

third party weather sites/apps seem to be pretty scammy in general