it is NewspaperCat - a service provided by the George Smathers Libraries as part of the University of Florida Digital Collections. And it is an award winning site as well!
NewspaperCat is a huge catalog that can tell you where the free online digital newspapers are located, at least for the United States, Canada, and the Caribbean.
The site is fairly easy to navigate - but for the reluctant to jump in - below is a short video showing you how to navigate the online catalog. And there are multiple ways to find out if your newspaper of interest is online - by topic, state or other location-based search. So you might want to check out the tutorial.
Just go to NewspaperCat and enter a city or state or other location-based search term - or even a name of a newspaper, and if there is an online version of that newspaper - the search results will tell you.
At the time of the publication of this article - there are over 2,000 newspapers in the database. Some are from the Google News Archives, some from Chronicling America, and some are from state-based and other online newspaper collections. I can't vouch for how thorough or up to date this database is, but keeping up with all of the emerging online collections as well as updated sites is a monumental task. So if you know of a newspaper that is available for free online, and it isn't in the NewspaperCat database - please don't blame me or the library - as I said - it is a very difficult task to keep up with all the new additions and updates.
So take a look at this wonderful catalog and I hope that it leads you to your ancestor's stories.