Originally Posted by
Velenei
The first scorching breath is always a few seconds after the fire dot he puts out. About a 10 second window after depending on what he casts inbetween. The second follows the same rules, and the 3rd is just rng from what i've seen. You won't be surviving a breath alone without a guardian spirit up though, so you better trust your holy priest.
For arcane storm, you just need a fast interrupter on it and it won't tick. For Abberations we just let one cast go off per phase, and make sure we get 3 abberations before each black phase.
The casts aren't 100% predictable, reacting to fight mechaincs as they happen is part of heroic raiding, and timers can't get you though every fight.