Intellicast. May she Rest In Peace. Wonderful while she existed: Clear, succinct, intuitive interface & results. Plethora of features, not always used, but available & useful when needed. The ads: Meh. Usual junk with occasional worthwhile clickbait. But the website itself? You could bet your life on it. I did.
Wunderground.com: Worse than useless. Any advertiser I see on it: I'm BOYCOTT-ing!
Remember: Past performance does not predict future results. But HERE, it does. IBM bought Intellicast.com & turned it into Wunderground. Great. IBM, who inflicted this fiasco, are the same idiots who subcontracted & gave-away the rights of what became DOS & Windows to a bunch of kids (Bill Gates & friends, who became Microsoft) for essentially FREE (see: http://thisdayintechhistory.com/11/06/ibm-signs-a-deal-with-the-devil/), denying their own (IBM) shareholders TRILLIONS of dollars that would eventually go to Microsoft.
IBM has a LEGACY of foibles. How else could Intellicast.com get so screwed-up?