The best alternatives to Hello Weather are Poncho, Weather Line 2, and Poncho. If these 3 options don't work for you, we've listed a few more alternatives below.
A Widget like WPF Desktop Application with Windows 10 Toast Notifications alerting of dangerous weather. Alerts are fetched every 10 minutes from https://alerts.weather.gov. The Desktop Weather App parses weather updates once every 30 minutes.
New weather service, where you can not only check the weather forecast, but also take part in its creation. The user gets an opportunity to leave messages about weather conditions on the map according to his geolocation.