|Tornado in Athens, Greece today.|
This just happened a couple hours ago as of this writing (8 a.m. EDT, United States) so I don't have many reports to go on.
Judging by the wild video below, which appears to have been taken through a window of a high rise, the tornado doesn't look too strong.
I don't see a lot of debris being hoisted aloft, which is a good thing. In general, the stronger the tornado the more stuff goes flying high into the air.
On the other hand, the tornado seems to have suction vortices, which are whirls within the main tornado circulation that can intensify damage.
Here's the video: