I've been following the public weather data scene for a long time and I'm pretty sure that UX for all the NOAA/NWS web sites is horrible by design, so to speak.
After all, there are plenty of well designed .gov sites (e.g. https://recreation.gov/), but just try browsing around weather.gov for a few minutes. It's horrible. I mean, the data is top-notch and it technically works, but the experience is awful. Weather.gov has had the exact same site for at least a decade.
This is completely speculative, but I would not be surprised to find a link between campaign contributions from the likes of the The Weather Channel and the decision to completely underfund the web development teams at NWS. Nothing else explains why some of the United States most valuable public data is presented on a web site barely more functional than Craigslist.