It appears they simply changed the URI where the data can be downloaded and nobody got the memo, or one was never issued on the first place. Doesn't look like they updated most of their own docs, if the links to them aren't entirely dead. Anyway you can find all of the raw data at least via FTP here:
ftp://tgftp.nws.noaa.gov/SL.us008001/DF.of/DC.radar/The trick is turning those product codes into English, because the docs I've found are for the old location, but as an example here is the lowest elevation 48nm base reflectivity for TRDU Raleigh Durham. I found it basically just checking random directories on there until i found the one that had today's dates on the files
ftp://tgftp.nws.noaa.gov/SL.us008001/DF.of/DC.radar/DS.180z0/SI.trdu/And sn.last is the most recent upload.
[At least i think it's reflectivity. I'm sitting here pressing wrong buttons all over my phone and have no way of making an image but if I bookmarked it that's probably it. If not then I'll bet it's velocity and reflectivity can't be too far away in the list very confusing especially since the old codes with the old data are still there]
I'm not even sure what format it is but the Weather and Climate Tool can make images out of it anyway, I'm looking into automating it myself but the software has some of the most ancient Unix code I've ever seen and it can be a lot of work just to build it on modern Linux! Well it's either ancient or does not conform to standard POSIX interfaces very well, it may work better on a different Unix but in my world of web app servers anything but Linux may as well not even exist at this point "Damnit Jim I'm a server engineer not a GIS guru!"
So i can figure out the code given enough time but it ain't going to be easy or quick, but it will be free...
