It should be obvious that it's more like 10 times smaller than Halifax, otherwise we wouldn't have gotten half the footage we are seeing right now, those people would be dead.
So .... some discussion in this thread suggests that the Halifax explosion was still 10x the size of this one... ish.
just in case you don't end up seeing that part of the post from other people.
A single m87 thermonuclear warhead has a detonation yeild of 300 tons of tnt, and a single ICBM can carry up to 10 of those.
Absolutely terrifying.
Yes, utterly horrifying on those points alone, to say nothing of the added destruction that air blast and supersonic shockwaves will do, even before you get to radiation.