In the alternative, there's RadioLocator's MW station day and night pattern maps, and there's Wiki, which has day and night power listed. Those are the resources I use, along with an old, outdated AM-DX website database of the AM stations in the US and Canada, which I update whenever I see a change in stations in my region. That site was very useful but the webmaster shut it down about 9 years ago.
But Wiki and RadioLocator are pretty good for trying to ID unidentified stations.