>estimating it to be around 13 meters in diameter.
Not big enough. It will break up 80-100 miles up. No one will even hear it. Something this size comes in every week, mostly unnoticed.
Get one close to 100 meters and it’s interesting.
I'm guessing it would take something about 10 km wide to wreak world wide havoc, even if it just burned to dust. Widespread crop failures for a couple of years after. That would be the disaster these articles want us to envision.