It looks like things are changing regarding Memberships. Looking thru the site I have uncovered some things;
1) Looking at the Feedback & Support / How do I join Weather Underground? -- They state that the one year membership is $10 and they are showing a non functioning link to
https://www.wunderground.com/signup. I think memberships were $5, maybe not.
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Putting it into your browser manually it takes you to a page to set up an account but before you are able to enter any information the page disappears into the default WU landing page.
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2) Selecting "Ad Choices" in the bottom banner takes you to another page that I don't remember going to before. It has some very interesting and disturbing information. It talks about two ad viewing options but nothing about a paid membership. Maybe memberships are going away.
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3) Going to My Profile only lets me Delete my account. My account is still paid up so maybe when it expires I might be able to re-up my account.