Can A Trigger Detect non-Target Spells Being Cast On It?

I was wondering if it was possible to have a trigger set up to detect the units that are affected by a spell when it is a non-target aoe spell like warstomp or howl of terror, blizzard.. ect


the only thing i know of is doing a pick all for units with a certain buff related to that spell.. but that wont work for those spells that dont use buffs and i need this to be generic enough that the trigger would respond to a large variety of possible spells

Might that be the event you seek? (try it out)
(generic unit event)

also, its bad form to make 2 topics around the same time in the same forum. ask 2 questions in one topic.