I think the first Concordia "disaster" was more of an accident than a "disaster". Thats not to take away from the lives that were lost or the seriousness of the incident. I do think disaster might be the wrong term for that.
The second Concordia "disaster" certainly was not a disaster. More like an unfortuante event, or just a fire. We have fires across the US in many homes every day, but they aren't typically labeled a disaster, even if people die.
As for the tornado "outbreak". There were so many of them across multiple states in a short time so I can see a headline such as "Tornado outbreaks causes disaster in multiple states".
It's just to get more people to click on the article and the best way to do that is by a "catchy" headline.