I know that WU is disabling a lot of things and WU-radar-inc is on the list to be deprecated.
I was able to get some minimal functionality working.
As of today, the only things that work are mode 1 (close zoom), mode 2 (medium zoom), mode 3 (regional zoom), mode 8 (vis sat), mode 9 (ir sat).
I had to make the following changes to make it work.
1) change the "type=N0R" to "type=NCR" in 5 URLs. ($CityURL, $MetroURL, and the mode 1, 2, 3 URLs).
2) change the limit of $ModePlus to 3 instead of 5 since modes 4 & 5 are no longer available.
3) in the top row of the table that renders the zoom and other controls, comment out the 2 lines for the last 2 zoom levels (5th & 6th URLs in the row; look for 'pic5' and 'pic6'). I didn't bother to try to make this dynamic based on $ModePlus
4) in the code that generates the links for the additional maps below the image, get rid of the links for "Fronts" and "Flu" (I created $dofronts and $doflu and used these to control the display like the other elements).
The N0R->NCR change makes it display current images. The rest are just getting rid of interface items that no longer works.