i'm going to play devil's advocate here and say that while it reeeeallly looks like alata and probably is, it may not be. there are a lot of Encyclias with similar color, size, and shape. attached is a pic of my alata (confirmed), and you will see that it looks a good bit different than your sort-of-NOID'ed flower here. to back me up, check out santa barbara's E. guatemalensis- it's about as similar to your flower as mine is (sborchid.com). you would need the help of a very experienced taxonomist to sort out some of the tiny differences in Encyclia species... but i bet you could get away with calling it alata even if it weren't.
in any case, whatever it is, that's a hot one. very showy. again, your Encyclias make me way jealous.