if true about what it was that exploded, that explosion makes sense.
edit: i saw another tweet that i'll take at its word since i have no clue how to actually measure explosions that said if it was that much ammonium nitrate that this would actually be just a bit bigger then a ONE megaton nuclear explosion which would explain, at least to me, the nuclear-like appearance of the explosion (white cloud of steam where the heat instantly evaporates the water in the air, shock wave that follows).