I agree that the spell doesn't appear to read that way at first glance, but the lead man himself says that's how it works. I think this is a fairly important point to iron out for those of us who have dm's who want to play by the book. Outside of sculpt spells, Evocation is pretty underwhelming...
If you read the tweets including the full conversation below you will see that is not the case
mobile.twitter.com/JeremyECrawford/status/610955844918886400
mobile.twitter.com/JeremyECrawford/status/557820938402947072
This has been answered by Jeremy Crawford ruling that empowered evocation is added to each missile.
Unfortunately I am unable to post the links since this forum doessent let new users post links
Basically each missile does the sum of your 1d4+1+modifiers that you only role once and therefore...