I haven't personally tried every app on this list, but these are the ones I use myself or that come up again and again as solid picks. As always, poke around and see what fits how you like your weather served up.
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Weather Underground
My go-to for hyperlocal forecasts, since it leans on data from community weather stations (including mine!) instead of just the nearest airport sensor.
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Ambient Weather
If you've got an Ambient station like my WS-2000, this is the companion app--live readings, history, and the ability to share your data straight from your phone.
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MyRadar
A clean, full-screen radar map with layers you can customize for storm tracking, hurricanes, or even aviation weather.
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RadarScope
Professional-grade radar data, the kind spotters and chasers use. More detail than most people need, but wonderful if you want to dig in.
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WeatherFront
Available for iOS and Android, and a favorite for the model-and-radar-obsessed: super-res dual-pol radar, GOES-19 satellite, and access to HRRR, GFS, RRFS, NAM, and ECMWF model data, plus NWS watches and warnings.
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RadarOmega
Another storm-tracking heavy hitter, with single-site radar from the US, Canada, Germany, Australia, and South Korea, plus lightning detection and 3D radar viewing. iOS, Android, and even a desktop version for Windows/macOS/Linux.
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AccuWeather
Detailed forecasts with minute-by-minute precipitation predictions and real-time severe weather alerts.
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The Weather Channel
A solid free option with broad coverage--radar, alerts, and standard forecasts--if you just want one reliable app.
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CARROT Weather
All the forecast data you'd expect, wrapped in a sarcastic, personality-driven interface. Not for everyone, but it makes checking the weather kind of fun.
Severe Weather Alerts
Because sometimes you need to know before the sirens go off.
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Max Velocity Weather
My personal favorite for severe weather notifications. An actual recording made by Max himself will call you once he deems that your location is in danger. I'm fortunate to live in an area with a good warning system, but I have gotten Max's calls before the tornado sirens go off. Costs about $15/year and worth every penny if you live in a high-risk area.
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WeatherBug
Free severe weather alerts backed by an extensive network of weather stations.
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CodeRED
Free, and used by 10,000+ local governments to send emergency notifications--severe weather warnings, evacuation orders, boil water notices, and the like--straight to your phone. You'll need to sign up through your own city or county to actually receive alerts for your area.