A basic app, but one that fills an important niche in the meteorological community. This allows citizens to report what is going on wherever they are, allowing forecasters to see what is really happening on the ground. This is very important, as even the lowest tilts of a radar beam will reflect conditions a little different than on the ground, and the rain-snow line can be hard to find. This app allows users to determine the rain-snow line and, when combined with radar data *cough* RadarScope *cough* allows the diagnosis of virga and other precipitation that does not appear on the radar (say, light snow far from the radar site, as happens in rural Montana. There should really be more publicity for this app to encourage its use and make the data more useful to meteorologists.
(For wXL23 on iOS)
This app is definitely overkill for the average person, but could as well be a godsend for mobile weather enthusiasts. If the NWS itself developed an app it could very well resemble wXL23. Customizing a new home location is a little clunky (you may have to add a new location and delete the home, then add a new home location), but the utility of this app is worth it. Radar and satellite products work well, but the 4-panel radar could cause the app to crash on some older phones. And very few apps will allow you to view the SPC convective outlooks or the high seas analyses and forecasts. A word of caution though: If the closest NWS office is not the one that serves your location, the app is liable to "misplace" you based on the office location. This is an issue in Orange County and the Inland Empire in southern California, where the app will place you in Los Angeles (based off an incorrect location for the office, which appears to be set in Anaheim) despite the fact that the area is served from San Diego. For another example, Mammoth Lakes is served from Reno, but the app assigns the location to Hanford.
The app does one thing and does it well. Radar coverage has expanded since the original post, and now covers Canada (including new upgraded radars in the past year), the Japanese island of Okinawa, and most of South Korea. Coverage of Australia has been announced for later in 2019. The use of high resolution data helps tease out features that could be hidden by coarser displays, and there is no smoothing to give a false sense of precision. The only issue I have with the app is that the Storm Relative Velocity product is of markedly lower resolution than even the lower resolution base velocity. Overall, a must-have app for any serious weather enthusiast. If you have the money, Pro Tier One will give you lightning data, a data inspector, and longer high resolution loops; it is a generally good deal at $10 per year. Pro Tier Two, at $15 per month or $100 per year, is overkill for most users, but professional meteorologists can see some value in the 30 day archives, local storm reports, shear and hail contours, and the cross-platform subscriptions.
Good weather app for people who really need to know when it's going to rain. Its rain forecasts are usually quite accurate, although they can degrade in accuracy in areas too close or too far from radar sites, or when clutter is not removed by the software. Due to limited data sources, the rain forecasts will only work in the US, parts of Canada covered by NWS radars, and the British Isles. As raw model data is used in the 7 day forecasts the accuracy can suffer in situations where the models fail, but overall they are generally accurate. As a bonus, the fact that the app is paid means that there is no need for intrusive ads or location tracking by third parties, something which the developers take pride in (especially the second part, as seen at https://blog.darksky.net/location-privacy/)