Wunderground.com is junk.
About a year ago, the rain sensor in my WS-1400-IP stopped working. While it was being replaced, I added a status message on my Weather Underground station page. After I got the replacement weather station up and running several days later, I went to delete the status message, but it wouldn't delete. Apparently, the ability to delete a status message after it is no longer needed broke and nobody ever fixed it. It can be CHANGED, but it can't be DELETED. Now, I can't get the °C setting to "stick" - it keeps reverting to °F. I've emailed Weather Underground at least a half-dozen times about these issues, but I never get a reply.