Weather apps are not needed... see rant below.
Bookmark your point forecast from the NWS
Bookmark your preferred radar website
Go to your state's 511 page, look at road conditions and webcams
Done. For 99% of the population this covers everything you need.
If you didn't know, most data that feeds into a weather app comes from the NWS. Its just repackaged in what is made to look like proprietary information, its not.
Take a deeper dive, read the forecast discussions from the individual NWS offices. They are updated at least twice a day, more often when weather conditions warrant and give reasoning behind there choices. For a particular storm they may discuss why they favor one weather model vs another and how that affected the current forecast.
Take an even deeper dive and look at the model data itself.....
https://www.pivotalweather.com/model.php
A little rant...
Watch the models long enough and it will happen that one of the model runs will flash a big snowstorm 5-6 days out, within a few hours the latest update of weather apps will show an alert for that snowstorm. People will see this and get excited/worried, then the weather model naturally "loses" the snowstorm in all subsequent runs (they run 4x daily). Low and behold the weather app updates and the snowstorm alert is gone.... Golly those weather guys don't what they are talking about.... no this sort of thing has happened in weather models since they were first made. Human forecasters now this and would never forecast a snowstorm from a single model run. App developers know this and regurgitate model output as forecasts to exploit it for views/clicks....