NOAA changed their RADAR page and broke a lot of things. I'm guessing that's what's broken this widget as well. Unless the developer is still around and can re-do the thing, there may be no hope for this one.

Yeah, the NWS "upgraded" their radar service, called RIDGE, to RIDGE II a couple of weeks ago.  Unlike the old system which had simple URLs to access radar images that could be simply fetched by a simple client, they made a "better" interactive web experience while degrading the access of data for third-parties.

The images are apparently still posted, but as TIFF files packed in archives, keyed by the weather station identifier.  This means that it's no longer a simple fetch for a PNG or JPEG to get a single timely image.

This follows a trend for the last few years where easy public access to taxpayer-funded government services have been degraded, presumably in favor of licensing.  The new system is still technically publicly available, but now requires some hoops to jump through to use it.

I use the URL Image widget by derossi to get local radar images.
Sorry but I cannot get to the settings (my laptop has flash disabled).
But I have used this to get still images of my local radar for years.