Multi-Attack spells: see result, fire next? Or before attack rolls?

@mikemearls @JeremyECrawford Multi-Atk spells (Scorching Ray, Eldritch Blast): Fire 1, see result, fire next? Or choose tgts b4 atk rolls?

— Nyke Young Workshop (@nykeyoungws) December 26, 2015

The intent is that you choose the targets consecutively, not simultaneously. #DnD https://t.co/qXAzpdtipT

— Jeremy Crawford (@JeremyECrawford) December 26, 2015