[aprssig] findU radar

[Steve Dimse]

There seems to be a problem with the radar images findU gets from the  
NWS, they have not updated in about 36 hours. I have cleared the  
radar cache on both servers, but the re-loaded images are the same  
old ones, so the problem is definitely on the NWS server. When I get  
a chance I'll take a closer look to see if I can figure out the  
problem. If anyone has heard anything about this problem elsewhere,  
please share your info!

Steve K4HG