I updated to the Jan 2 '18 build of osmc, running Kodi 17.6 on a raspberry pi 3. and found there is no more Weather Underground? I found this strange because I have another box also running 17.6 and weather underground works fine there. My other box is a T530 thinkpad, using debian 9 with a self compiled kodi, no modifications to the code.
Never mind, it was disabled. Though not by me.